Chelated Manganese EDTA Fertilizer 13% Mn
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Water-soluble manganese micronutrient · 13% Mn · EDTA chelated
About Chelated Manganese EDTA 13% Mn
Chelated Manganese EDTA is a fully chelated, water-soluble powdered manganese fertilizer with a guaranteed 13.0% manganese, all of it chelated by EDTA. Use it to prevent or correct a confirmed manganese deficiency: applied to the soil, metered through drip, sprinkler, or furrow irrigation, sprayed on the foliage when soil application is impractical, or weighed into a hydroponic or fertigation recipe. It supplies manganese only; it is not a complete fertilizer.
Manganese deficiency looks a great deal like iron deficiency, and it is often caused by soil conditions that tie up manganese already present rather than by a simple shortage. University of Florida IFAS notes that manganese deficiency occurs more often in high-pH and dry soils. Confirm that manganese is the problem, ideally with a plant tissue test, before you buy.
- 13.0% Mn All of it chelated by EDTA. Each pound of product supplies 0.13 lb (59 g) of manganese
- 4–12 lb / acre Manufacturer soil rate for vegetable and field crops, by product weight (4–15 lb for tree and vine crops). Individual-tree, turf, foliar, and reservoir directions are in Application rates
- 1–25 lb bags Four sizes. The size calculator below weighs the dose for your area, trees, spray, or reservoir and recommends a bag
Product facts & composition
| Specification | Detail |
|---|---|
| Manganese (Mn) | 13.0% |
| Chelated manganese (Mn) | 13.0%. All of the manganese is chelated. |
| Derived from | Manganese EDTA (manganese disodium ethylenediaminetetraacetate, CAS 15375-84-5) |
| Nitrogen, phosphate, potash | None declared. This is a micronutrient source, not an N–P₂O₅–K₂O fertilizer. |
| Physical form | Fully chelated, water-soluble powder, light pink to tan |
| Solubility and mixing | Dissolves in water or fluid fertilizer and can be dry-blended with water-soluble fertilizers. A 1–2% solution measures about pH 6.0–7.5. |
| Hazard classification | Not classified as hazardous; no signal word |
| Package sizes | 1 lb, 2 lb, 5 lb, and 25 lb |
| Name and address on the label | Greenway Biotech, Inc., 17861 Road 24, Madera, California 93638 |
Percentages are by weight of product. 1 oz of product contains 3.7 g of manganese, a 1 lb bag contains 59 g (2.08 oz) of manganese, and a 25 lb bag contains 3.25 lb of manganese. Every rate on this page is stated as product weight, with the elemental manganese it delivers shown beside it. In solution, 1 gram of product dissolved in 1 liter of final solution supplies 130 mg/L of manganese.
Best uses & benefits
Choose this product when a diagnosis points to manganese in one of these situations. Yellowing between the veins has several causes, and manganese and iron deficiency are especially easy to confuse.
Preventing manganese deficiency with a soil application
The manufacturer’s label recommends this chelate for use on all types of soil and states that its preferred use is as a soil application to prevent deficiency. It lists vegetable, field, tree, vine, ornamental, and turf uses, applied broadcast, under the drip line, or through drip, sprinkler, or furrow irrigation.
Foliar correction of a deficiency you can see
The label gives foliar sprays for correction when soil application is impractical, with per-acre rates, minimum spray volumes, and timing for vegetable, field, tree, vine, citrus, and turf uses. University of Florida IFAS states that, as with other micronutrients, foliar spray is much more effective than soil application for manganese. A spray treats only the leaves it reaches.
Soils and seasons where manganese runs short
University of Minnesota Extension reports that deficiency is likely on heavily weathered sandy soils and on peat or organic soils with a pH above 6.0, and that cold, wet soil can cause it by slowing root growth and activity. IFAS adds high-pH and dry soils. Sensitive crops named by Minnesota include apples, dry and snap beans, cucumber, grapes, lettuce, oats, onion, peas, potato, radish, raspberries, soybean, spinach, sugarbeet, and wheat.
The manganese line in a hydroponic or fertigation recipe
A single-nutrient, water-soluble manganese source for a complete nutrient program, dosed by weight to the manganese concentration your recipe specifies. Most complete hydroponic fertilizers already supply manganese, so account for it before adding more.
Where it is a poor fit
- Yellowing that has not been diagnosed. Manganese and iron deficiency both produce yellow tissue between green veins. Where the pattern starts is not a dependable way to tell them apart, as explained under How it works; a plant tissue test is. If a test points to iron, use Chelated Iron EDTA instead.
- Plants that already have enough manganese. University of Florida IFAS warns that excessive manganese applications normally induce an iron deficiency. More manganese does not fix yellowing that has another cause.
- Concentrated spot or band applications made at a broadcast rate. The manufacturer warns that using broadcast rates for spot or banded applications may cause phytotoxicity.
- Home lawns treated by the label’s turf directions. The manufacturer marks its turf rates for professional use only. They are shown under Application rates & directions for professional applicators, not as a homeowner lawn program.
- A pH problem you expect the chelate to fix. This product supplies available manganese. It does not lower soil pH.
- A complete fertilizer. This product supplies manganese only. A crop short of nitrogen, phosphate, or potash will not respond to it.
Application rates & directions
Every rate below is product weight unless the label prints a volume. The direction set comes from the manufacturer’s label for this 13% manganese EDTA, meaning the specimen label for this exact analysis, held on file by Greenway Biotech. It carries soil and fertigation rates per acre with the label’s crop lists, a turf rate per 1,000 sq ft, an individual-tree rate per inch of trunk diameter, ornamental and turf-spray directions as printed, and foliar and aerial rates with spray volumes, timing, and pH buffering. University Extension context has its own heading, and every source is listed under Product documents & sources. Confirm manganese deficiency before applying any of these.
Weigh it. This product’s density has not been measured, so no gram equivalent is given for the tablespoon and teaspoon measures the manufacturer prints for ornamentals and turf sprays; use those measures as printed. Everything else is weighed: use a scale reading to 0.1 g for garden, tree, and reservoir amounts, and pounds on a larger scale for field, orchard, and turf blocks.
Manufacturer directions: soil and fertigation
| Crop group (as listed on the label) | Label rate | Per 1,000 sq ft | Elemental manganese per acre | Method |
|---|---|---|---|---|
| Vegetable crops: beans, peas, potatoes, sweet corn, tomatoes | 4–12 lb per acre | 1.47–4.41 oz (41.7–125 g) | 0.52–1.56 lb Mn | For uniform coverage, dissolve in water or fluid fertilizer, or dry-blend with water-soluble fertilizers. Or dissolve and meter into drip, sprinkler, or furrow irrigation |
| Field crops: corn, dry beans, sorghum, sugar beets, sugarcane | 4–12 lb per acre | 1.47–4.41 oz (41.7–125 g) | 0.52–1.56 lb Mn | Same |
| Tree and vine crops: almond, apple, apricot, avocado, berry, cherry, citrus, grape, mango, olive, pear, peach, pistachio, plum, walnut | 4–15 lb per acre, or ½–2 oz per inch of tree diameter for individual trees | 1.47–5.51 oz (41.7–156 g) | 0.52–1.95 lb Mn | Per acre for a planted block. For individual trees, blend the weighed amount with an inert such as soil or sand, or sprinkle it directly and uniformly on the soil under the drip line, then water in |
| Ornamental shrubs and trees: azaleas, gardenias, junipers, pines, roses | 2 tbsp for small shrubs, up to 2 tbsp per inch of tree diameter for large trees and shrubs (volume as printed; no gram equivalent) | — | — | Under the drip line as for individual trees, then water in |
| Turf (professional use only) | ½ lb per 1,000 sq ft, or 22 lb per acre | 8 oz (227 g) | 2.83 lb Mn (2.86 lb at the label’s rounded 22 lb per acre) | Dissolve and apply uniformly, or meter into irrigation. Do not apply near water, storm drains, or drainage ditches, or if heavy rain is expected. Sweep product off pavement back onto the turf |
The manufacturer’s rates are for broadcast application, and its label warns that using them for spot or banded applications may cause phytotoxicity. Greenway’s condition on every rate here: start at the low end unless a soil or tissue test interpretation for the crop supports more. Measure the area actually treated, spread or meter the weighed amount uniformly, and water it in. Make one application per confirmed need rather than following a standing schedule, then reassess the crop before treating again.
Individual trees and vines: the per-inch direction
For a single tree or vine, the manufacturer’s label gives ½–2 oz of product per inch of trunk diameter (14–57 g per inch). Measure the trunk diameter, multiply, and start at ½ oz per inch unless the diagnosis supports more. Worked example: a 4-inch-diameter apple tree has a range of 2–8 oz (57–227 g) of product, delivering 7.4–29.5 g of manganese; begin at 2 oz. Sprinkle it uniformly on the soil under the drip line, or blend it with soil or sand first, keep it off the trunk, and water it in.
Which direction applies to which plant. The label prints two different directions that can both seem to fit a woody plant. Use the tablespoon direction for the ornamental species the label names: azaleas, gardenias, junipers, pines, and roses. Use the ½–2 oz per inch direction for the fruit, nut, and vine species in the tree and vine list. For a planted orchard or vineyard block, use the per-acre rate instead of the per-inch rate. Do not add two directions together.
Manufacturer directions: foliar and aerial application
| Crop group | Label rate | Spray volume | Timing and conditions |
|---|---|---|---|
| Vegetable and field crops, ground equipment | ⅓–1⅓ lb per acre (151–605 g) | Enough for thorough coverage, 25 gal per acre minimum | When soil application is impractical |
| Tree and vine crops, excluding citrus | 1–2 lb per acre (454–907 g) | Enough for thorough coverage, 25 gal per acre minimum | At dormant or delayed dormant before bloom, then after full bloom at 2–3 week intervals as needed |
| Deciduous crops with fruit present | 1 lb per acre (454 g) | 50–100 gal per acre | Reduced rate and higher spray volume while fruit is on the tree |
| Citrus | 1–2 lb per 100 gal of cover spray (4.5–9.1 g per gallon) | Full cover spray | Any time except during bloom |
| Turf (professional use only) | General turf: 1 tbsp per 1,000 sq ft. Golf greens: 1 tsp per 1,000 sq ft (volumes as printed; no gram equivalent) | Enough for thorough coverage | Water-protection restrictions as for soil use. Sweep product off pavement back onto the turf |
| Aerial application | ⅓ lb per acre (151 g) | At least 10 gal per acre | Follow the timing and frequency of the matching foliar direction |
For every foliar use, buffer the spray solution to pH 6–6.5 after diluting. Apply enough volume for thorough coverage; the label notes that coverage and wetting agents often enhance uptake. Do not spray plants that are suffering from moisture stress. The manufacturer permits application in water or in combination with most pesticides. When there is any doubt, spray a small test area of the crop first to check for phytotoxicity. Start at the low end of a range. The citrus figure is a cover-spray concentration for citrus only. Every other foliar direction here is a weight per acre, or a printed volume per 1,000 sq ft for turf, and none of them should be converted into a general per-gallon mixing rate for another crop. These are the manufacturer’s directions for this exact analysis; they do not transfer to manganese sulfate or any other manganese product.
What university Extension adds
University of Florida IFAS states that foliar spray is much more effective than soil application for manganese, as for other micronutrients. The manufacturer’s label frames it differently: soil application is its preferred use, to prevent a deficiency, with a foliar spray to correct one when soil application is impractical. Read together, soil application suits prevention where a soil test or crop history predicts a shortage, and IFAS’s finding is a reason to favor the foliar route when correcting one. IFAS also gives an example for commercial vegetables: 0.2–0.5 lb of manganese EDTA in 200 gal of water per acre. That example does not state whether the weight is manganese or product, so the page does not convert it; the manufacturer’s foliar rates above are the directions for this product. For palms, IFAS’s palm publication describes a foliar manganese spray as faster but short-term, a supplement to soil application rather than a replacement.
Container and houseplants
No weighed container rate has been verified for this product. The manufacturer’s label covers field, orchard, turf, and landscape uses only, and its ornamental directions are volumes with no measured density behind them. To treat containers, dose by solution instead: use the reservoir method below at the manganese concentration your feeding program specifies, and apply enough solution to wet the whole root ball. Email questions@greenwaybiotech.com with your plant, pot size, and current feeding program and we will work it out with you.
Hydroponic and fertigation solutions
The manufacturer’s label covers fertigation as a way to deliver the soil rates above through irrigation. It gives no target concentration for a recirculating hydroponic reservoir, and no single manganese concentration fits every crop and recipe, so this page does not pick one for you. For example, University of Florida IFAS formulates hydroponic tomato solutions at 0.8 mg/L manganese across all growth stages, at a solution pH of 5.8–6.2; your recipe may differ. Take the manganese target from your complete recipe and subtract the manganese your base fertilizer already supplies. If you have a source-water analysis, subtract any manganese it reports, and dose the difference. An EC or TDS meter measures total dissolved salts and cannot tell you the manganese concentration.
Dosing by weight. Product (g) = additional manganese needed (mg/L) × final solution volume (L) ÷ 130. One gram of product in one liter supplies 130 mg/L of manganese, so 2.91 g raises 100 US gal (378.5 L) by 1 mg/L. Dissolve the weighed amount in water first and add it to a dilute, compatible solution. No maximum stock concentration has been verified for this product. Mix injector stocks well below saturation, stir until the solution is completely clear with no undissolved particles, and screen the stock before it reaches the injector.
Worked example: a 100 US gal reservoir (378.5 L), recipe target 0.8 mg/L Mn, with none supplied by the base fertilizer. Manganese needed = 0.8 mg/L × 378.5 L = 303 mg, which is 303 ÷ 130 = 2.33 g of product. Small doses: when the calculated amount is under 1 g, make a 10.0 g/L measuring stock. Weigh 10.0 g, dissolve it, and make it up to exactly 1,000 mL; each mL then holds 1.30 mg of manganese. Measure mL of stock = mg of manganese ÷ 1.30 with graduated equipment, not spoons. Label the stock and keep it secured.
How to use Chelated Manganese EDTA
- Diagnose first. Manganese deficiency shows as yellow tissue between green veins, the same pattern iron deficiency produces. Check drainage, root health, and the complete nutrient program, and confirm manganese with a plant tissue test where you can. Note the conditions that favor it: high-pH, sandy, organic, dry, or cold and wet soils.
- Choose the exact crop and method. Pick the manufacturer’s row for your crop group and method: broadcast or fertigation by acre, turf by 1,000 sq ft, individual trees by trunk diameter, ornamentals by the printed tablespoon direction, or a foliar spray by acre or by gallons of cover spray. Do not transfer a broadcast rate to a spot, band, or foliar application.
- Measure, then weigh. Record the area actually treated, the trunk diameter of each tree, the spray volume, or the reservoir volume and the manganese already in it. The calculator applies the documented rate; weigh the result on a scale.
- Apply uniformly. Soil: dissolve in water or fluid fertilizer, or dry-blend with a water-soluble fertilizer. Spread or meter it evenly over the measured area and water it in; for individual trees, apply it under the drip line. On a small bed, do not try to broadcast a few grams of dry powder. Instead, dissolve the weighed amount completely in enough water to wet the measured area evenly, apply that solution, then water in with plain water. Foliar: dissolve in the full spray volume, buffer to pH 6–6.5, and cover thoroughly; do not spray moisture-stressed plants. Reservoirs: dissolve first, then add to the dilute solution.
- Monitor before repeating. Watch the newly expanding leaves. Reassess the crop before any second soil application, and repeat foliar sprays only at the label interval as needed.
Calculator & choosing a size
Formulas. Square feet ÷ 43,560 = acres; multiply pounds by 453.6 for grams.
- Soil by area: product (lb) = acres × 4–12 lb for vegetable and field crops, or 4–15 lb for tree and vine blocks.
- Turf (professional use only): product (lb) = square feet ÷ 1,000 × ½.
- Individual trees or vines: product (oz) = trunk diameter (inches) × ½ to 2, per tree.
- Foliar by area: product (lb) = acres × ⅓–1⅓ lb for vegetable and field crops, 1–2 lb for trees and vines, 1 lb with fruit present, or ⅓ lb aerial. Use at least 25 gal of spray per acre (50–100 gal with fruit present; 10 gal aerial).
- Citrus cover spray: product (lb) = gallons of spray ÷ 100 × 1 to 2.
- Reservoir: product (g) = (recipe target − manganese already present, in mg/L) × final liters ÷ 130.
Turf sprays are printed as tablespoon and teaspoon volumes, so they are not in the calculator.
Worked examples. A 2,000 sq ft vegetable bed with confirmed manganese deficiency: 2,000 ÷ 43,560 × 4–12 lb = 0.18–0.55 lb, which is 83–250 g. Start at 83 g; a 1 lb bag covers it. One 4-inch apple tree: 4 × ½ to 2 oz = 2–8 oz (57–227 g); start at 2 oz, and a 1 lb bag covers it. A 100 gal reservoir at a 0.8 mg/L target with none already present: 0.8 × 378.5 ÷ 130 = 2.33 g.
The calculator below applies these directions and shows the full range, with the conservative end as the starting amount. It states the manganese delivered and, for sprays, the minimum spray volume. It then recommends the lowest-price bag combination that covers the starting amount for one application, plus the least-leftover combination when that differs. Prices, tax, and shipping are confirmed at checkout, and availability is confirmed when you add to cart.
The calculator needs JavaScript. If it does not appear, use the formulas and worked examples above to choose a size.
How manganese EDTA works
Manganese is a micronutrient: plants need it in small amounts, but they cannot photosynthesize normally without it. Its best-known role is in photosystem II, where water is split during photosynthesis and oxygen is released. When manganese runs short, the tissue between the veins turns yellow while the veins stay green.
Soils usually contain manganese; the problem is availability. University of Florida IFAS explains that soil pH, aeration, moisture, and organic matter all influence how much manganese plants can take up, and that deficiency occurs more often in high-pH and dry soils. University of Minnesota Extension adds that dissolved manganese binds readily with organic matter, which is why peat and organic soils above pH 6.0 are prone to deficiency. It also notes that cold, wet soil reduces uptake by slowing roots. A chelating agent such as EDTA holds the manganese ion in a soluble complex, and IFAS notes that chelated manganese can improve manganese availability. The manufacturer’s label and IFAS differ on method, as described under Application rates: the label prefers soil application for prevention, while IFAS reports foliar spray as much more effective.
Where the yellowing starts varies by plant. University of Minnesota Extension describes manganese deficiency in most field and vegetable crops as interveinal chlorosis in the young leaves. Colorado State University Extension, writing about woody landscape plants, says manganese and zinc deficiencies typically appear first on older, interior leaves, while iron chlorosis appears first on the younger, terminal leaves. Because the patterns overlap, leaf position alone cannot separate manganese from iron. A plant tissue test can.
Excess is also a risk. University of Florida IFAS reports that excessive manganese applications normally result in an induced iron deficiency, with its characteristic yellowing of new leaves. That is one more reason to test, start at the low end, and apply once per confirmed need. The evidence above concerns manganese nutrition generally; it is not a trial of this finished product.
Compare your options
Match the product to the nutrient your test identified and to the method you will use. Analyses are each product’s guarantee as shown on its page.
| Option | Nutrient | Choose it when | Limitation |
|---|---|---|---|
| Chelated Manganese EDTA 13% Mn, this product | 13.0% Mn, all chelated with EDTA | Confirmed manganese deficiency, where you want the manufacturer’s full soil, tree, turf, foliar, and aerial direction set, fertigation, or a weighed recipe line | Lower manganese content per pound than the sulfate; supplies manganese only; does not lower pH |
| Manganese Sulfate 31% Mn | 31% Mn and 18% S, as manganese sulfate monohydrate, unchelated | Programs that call for manganese sulfate, where sulfur is wanted as well, and where more manganese per pound matters | Unchelated. Follow that product’s own directions; rates on this page do not transfer to it |
| Chelated Iron EDTA 13.2% Fe | Iron, not manganese | A tissue test identifies iron as the deficient nutrient | Supplies no manganese; its effectiveness depends on soil pH |
| Chelated Zinc EDTA | Zinc, not manganese | A tissue test identifies zinc as the deficient nutrient | Supplies no manganese |
Handling, storage & limitations
- Classification. This product is not classified as hazardous, and no signal word applies. Observe good industrial hygiene practices and wash your hands after handling.
- Protective equipment. Wear safety glasses with side shields or goggles, chemical-resistant gloves, a long-sleeved shirt, and long pants. Use the powder only in well-ventilated areas and avoid breathing dust.
- Storage. Keep the container tightly closed in a cool, dry, well-ventilated area. Store away from strong oxidizing agents, strong acids, and strong bases, and out of reach of children.
- Water, food, and feed. Do not apply near water, storm drains, or drainage ditches, or when heavy rain is expected. Sweep any product that lands on the driveway, sidewalk, or street back onto the treated area. Do not contaminate water, food, or feed by storage or disposal. Not for human or animal consumption.
- Application limits. Broadcast rates concentrated into spot or band applications may cause phytotoxicity. Do not spray moisture-stressed plants, and buffer foliar sprays to pH 6–6.5. Test a small area of the crop when in doubt. Turf directions are for professional use only. Excess manganese can induce iron deficiency, so make one soil application per confirmed need, then reassess.
- What it does not do. It supplies manganese only. It does not lower pH, correct root damage or waterlogging, fix an iron or zinc deficiency, or replace a complete fertilizer.
- First aid. Inhalation: move to fresh air. Skin: wash with soap and water. Eyes: rinse with water for at least 15 minutes, removing contact lenses if present and easy to do. Swallowed: rinse mouth with water, and get medical attention if symptoms occur. The 24-hour emergency number is CHEMTREC, 1-800-424-9300 (international +1-703-527-3887).
California Proposition 65. WARNING: This product can expose you to chemicals including arsenic, cadmium, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov/product.
Frequently asked questions
What is Chelated Manganese EDTA 13% Mn, and when should I choose it over manganese sulfate?
It is a water-soluble micronutrient fertilizer containing 13.0% manganese, all of it chelated by EDTA, for preventing and correcting manganese deficiency. Choose it when you want the manufacturer’s complete weighed direction set for this product, covering soil, individual trees, turf, foliar, and aerial use, or a chelated manganese line for fertigation or a hydroponic recipe. Manganese sulfate carries more manganese per pound (31%) and adds sulfur, but it is unchelated and has its own directions. The rates on this page do not transfer between the two. Confirm the deficiency with a tissue test before buying either.
How do I tell manganese deficiency from iron deficiency?
Both show as yellow tissue between green veins, and leaf position does not reliably separate them. University of Minnesota Extension describes manganese deficiency in most crops as appearing on young leaves, where iron deficiency also starts. Colorado State University Extension says that on woody landscape plants manganese and zinc deficiencies typically appear first on older, interior leaves, while iron appears first on the youngest. Conditions give clues: manganese deficiency is common on high-pH, sandy, peat, or organic soils, and in cold, wet or dry soil. A plant tissue test is the reliable way to tell. If it points to iron, use Chelated Iron EDTA instead.
How much manganese EDTA should I apply to soil?
The manufacturer’s label for this 13% manganese EDTA gives 4–12 lb per acre for vegetable and field crops and 4–15 lb per acre for tree and vine crops. That is 1.47–4.41 oz (41.7–125 g) and 1.47–5.51 oz (41.7–156 g) per 1,000 sq ft. Dissolve it in water or fluid fertilizer, dry-blend it with a water-soluble fertilizer, or meter it through drip, sprinkler, or furrow irrigation. Spread it uniformly and water it in. Start at the low end and make one application per confirmed need. Do not concentrate a broadcast rate into a spot or band, because phytotoxicity may result. These are product-label directions, not university recommendations.
How much should I use for one tree, shrub, or vine?
The manufacturer’s label gives ½–2 oz of product per inch of trunk diameter for an individual tree or vine in its fruit, nut, and vine list. A 4-inch-diameter tree has a range of 2–8 oz (57–227 g); begin at 2 oz unless the diagnosis supports more. Sprinkle it uniformly on the soil under the drip line, or blend it with soil or sand first, keep it off the trunk, and water it in. For the ornamental species the label names (azaleas, gardenias, junipers, pines, and roses), use the printed tablespoon direction instead: 2 tbsp for small shrubs and up to 2 tbsp per inch of tree diameter. Measure it as a volume, because no gram equivalent has been measured for this product. For a planted orchard or vineyard block, use the per-acre rate of 4–15 lb. Do not add two directions together.
Can I use manganese EDTA as a foliar spray?
Yes, on the crops the manufacturer lists. Its directions are ⅓–1⅓ lb per acre for vegetable and field crops and 1–2 lb per acre for tree and vine crops other than citrus, each in at least 25 gal of spray per acre. Deciduous crops with fruit present take 1 lb per acre in 50–100 gal, and citrus takes 1–2 lb per 100 gal of cover spray, any time except during bloom. By air, apply ⅓ lb per acre in at least 10 gal. Buffer the spray to pH 6–6.5, cover thoroughly, do not spray moisture-stressed plants, and test a small area of the crop when in doubt. University of Florida IFAS reports that foliar spray is much more effective than soil application for manganese, but a spray treats only the leaves it reaches.
How much manganese EDTA do I mix per gallon of water?
It depends on the use, because the manufacturer’s label for this 13% manganese EDTA sets most rates by area, not by gallon. The only per-gallon direction is for citrus: 1–2 lb per 100 gal of cover spray (4.5–9.1 g per gallon), any time except during bloom. It is not a mixing rate for other plants. For other foliar uses, weigh the per-acre rate for your crop (⅓–1⅓ lb per acre for vegetable and field crops, 1–2 lb per acre for tree and vine crops other than citrus) and dissolve it in at least 25 gal of spray per acre; the calculator does both steps. For soil, weigh the rate for the area you are treating and dissolve it in enough water to wet that area evenly. For containers and reservoirs, dose to the manganese concentration your feeding program specifies: 1 g of product in 1 liter supplies 130 mg/L of manganese. Spoon measures are not converted to grams here, because a spoonful of this powder has not been weighed.
How much manganese EDTA do I add to a hydroponic reservoir?
Dose to the manganese concentration your recipe specifies, after subtracting what your base fertilizer and source water already supply; this page does not choose a target for you. Product in grams = additional manganese needed in mg/L × final liters ÷ 130, so 2.91 g raises 100 US gallons by 1 mg/L. For example, University of Florida IFAS formulates hydroponic tomatoes at 0.8 mg/L manganese, which in a 100 gal reservoir with none present takes 0.8 × 378.5 ÷ 130 = 2.33 g of product. Weigh the product, dissolve it separately, and add it to the dilute solution. For doses under 1 g, use a 10 g/L measuring stock. Most complete hydroponic fertilizers already contain manganese, and an EC or TDS meter cannot measure it.
Can I use manganese EDTA on my lawn?
The manufacturer’s label carries turf directions of ½ lb per 1,000 sq ft (22 lb per acre) to the soil, and sprays of 1 tbsp per 1,000 sq ft for general turf and 1 tsp per 1,000 sq ft for golf greens. It marks all of them for professional use only. It also restricts application near water, storm drains, and drainage ditches or when heavy rain is expected, and directs that any product on pavement be swept back onto the turf. This page reproduces those directions for professional applicators and does not offer a separate homeowner lawn rate.
Can I tank-mix manganese EDTA with glyphosate or other pesticides?
The manufacturer permits application in water, with fluid fertilizers, dry-blended with water-soluble fertilizers, and in combination with most pesticides. Glyphosate needs extra care, because manganese in the spray tank can reduce its weed control. Research from Michigan State University found that the effect differed between manganese formulations and that adding ammonium sulfate to the tank reduced it. Follow the glyphosate product’s label for manganese tank mixes and adjuvants, and jar-test the exact mixture before use. Dissolve ingredients separately, combine them only in a dilute compatible solution, and spray a small test area first; a clear jar does not establish crop safety.
Can too much manganese harm my plants?
Yes. University of Florida IFAS reports that excessive manganese applications normally result in an induced iron deficiency, which shows as yellowing of the new leaves and can be mistaken for the problem you were treating. Confirm the deficiency first, start at the low end of the label range, make one soil application per confirmed need, and reassess before applying again. In a hydroponic system, account for the manganese your base fertilizer already supplies.
Is this product organic or registered as a pesticide?
Neither. EDTA is a synthetic chelating agent, and this product does not carry an OMRI listing or an organic input registration. Growers under certification should get product-specific approval from their certifier before use. It is sold for plant nutrition only, is not registered as a pesticide or fungicide, and does not control plant disease.
Related guides & articles
- Why Are My Plant’s Leaves Turning Yellow? 8 Causes and How to Fix Them: how to separate a manganese or iron shortage from overwatering, pH, magnesium, and the other common causes before you treat.
- Potassium and Manganese in High-Carbohydrate Crops: what manganese does in photosynthesis and carbohydrate metabolism, how deficiency shows on young leaves, and why high-pH soils tie it up.
Articles give background. For this product, use the directions and documents on this page.
Product documents & sources
- Safety Data Sheet: available on request. It covers composition, hazard classification, handling, storage, first aid, and the California Proposition 65 statement.
- Product label: available on request. It shows the guaranteed analysis for this product. For the weighed direction set, see Application rates & directions, and ask us about any difference before applying.
Where the rates and statements on this page come from
The soil, fertigation, turf, individual-tree, ornamental, foliar, and aerial directions come from the manufacturer’s label for this same 13% manganese EDTA. The statements on manganese availability, deficiency conditions and symptoms, sensitive crops, application method, excess manganese, and nutrient-solution dosing come from the university Extension publications below. They are listed for growers, advisors, and certifiers who want to check them. The Extension sources explain nutrient management; they do not certify or endorse this product.
- Manufacturer’s specimen label for this 13% manganese EDTA (form dated 2018), on file with Greenway Biotech: the direction set reproduced under Application rates & directions.
- University of Florida IFAS, Understanding and Applying Chelated Fertilizers Effectively Based on Soil pH (HS1208): the factors that control manganese availability, deficiency in high-pH and dry soils, chelated manganese availability, foliar versus soil effectiveness, and the commercial-vegetable manganese EDTA example.
- University of Minnesota Extension, Manganese in Minnesota Soils: deficiency on sandy, peat, and organic soils above pH 6.0, binding to organic matter, cold and wet soil, symptoms on young leaves, and the list of sensitive crops.
- Colorado State University Extension, CMG GardenNotes 223, Iron Chlorosis of Woody Plants (PDF): manganese and zinc deficiencies appearing first on older, interior leaves of woody plants, and iron chlorosis on younger leaves.
- University of Florida IFAS, Manganese Deficiency in Palms (EP267): excess manganese inducing iron deficiency, and foliar manganese as a faster, short-term supplement to soil application.
- University of Florida IFAS, Nutrient Solution Formulation for Hydroponic (Perlite, Rockwool, NFT) Tomatoes in Florida (CV216): the 0.8 mg/L manganese example and solution pH used to illustrate recipe-based reservoir dosing.
- Bayer Crop Science, Manganese Fertilizer and Glyphosate Antagonism, summarizing Michigan State University research: differences between manganese formulations in the spray tank, and ammonium sulfate reducing the effect.
Rates and sources reviewed September 24, 2026.
Help choosing & next step
Not sure whether the yellowing is manganese or iron, or which method suits your crop? Email your crop, test results, soil type, acreage or tree diameters, spray volume, and intended method to questions@greenwaybiotech.com. Or call (562) 351-5168, Monday to Friday, 7 AM to 5 PM Pacific, and we will work through it with you.
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Greenway Biotech, Inc. is a family-owned fertilizer company in Madera, California, blending and packaging specialty fertilizers and soil amendments since 1989.