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Monoammonium Phosphate 11-52-0 is the granular grade of monoammonium phosphate, made for applying phosphorus to soil. It guarantees 52% available phosphate (P₂O₅) and 11% nitrogen, all of it ammoniacal, with no potash. It is the most common grade of monoammonium phosphate, and California’s crop fertilization guidelines name it as a popular starter fertilizer for corn.
Use it where a soil test shows low phosphorus: worked into garden beds, new lawns, and planting areas before planting, or, for row crops, banded 2 inches beside and 2 inches below the seed row at planting. Phosphorus moves very little in soil, so mix it in or band it rather than leaving it on the surface. It is for soil only, not for fertigation, drip, foliar sprays, or hydroponics.
52% P₂O₅ Available phosphate, equal to 22.7% phosphorus (P). Each pound supplies 0.52 lb of P₂O₅
11% N All ammoniacal nitrogen, about 50 g per pound. No potash
Soil only Granules for spreading and banding. The calculator sizes one application for beds, trees, lawns, or your soil test
Product facts & composition
Guaranteed analysis and product specifications, Greenway Biotech Monoammonium Phosphate 11-52-0
Specification
Detail
Total nitrogen (N)
11%, all ammoniacal nitrogen
Available phosphate (P₂O₅)
52%
Soluble potash (K₂O)
None guaranteed (the grade is 11-52-0)
Phosphorus as P
22.7% (52% × 0.4364, the share of P in P₂O₅)
Composition
Mostly monoammonium phosphate (ammonium dihydrogen phosphate, CAS 7722-76-1) at 80–90%, with ammonium sulfate at 3–5% and calcium sulfate dihydrate at 1–2%, according to the Safety Data Sheet
Form
Granules. The color varies from black to brown to light green, according to the Safety Data Sheet
Solution pH
4 to 6 for a 10% solution, according to the Safety Data Sheet
Intended use
Soil application. The Safety Data Sheet says not to use it in fertigation or foliar systems
Registration
Registered with the California Department of Food and Agriculture (CDFA)
Hazards
Not classified as hazardous under OSHA’s Hazard Communication Standard; dust can irritate the eyes, skin, nose, and throat. Carries a California Proposition 65 warning for cadmium. See Handling, storage & limitations
Package sizes
2, 5, 10, 25, and 50 lb (the 50 lb size may ship as two 25 lb bags)
Percentages are by weight of product. Pure monoammonium phosphate works out to about 12.2% nitrogen and 61.7% P₂O₅; this granular grade guarantees less because the granules also contain the other compounds listed above. Calculate from the guaranteed 11-52-0, and weigh the product: this page gives no cup or spoon conversions.
Best uses & benefits
Choose it when a soil test shows your soil needs phosphorus and you will mix it into the soil or band it at planting.
Garden beds and new plantings
Iowa State and University of Minnesota Extension give phosphate rates for vegetable and flower gardens by soil-test phosphorus, and Minnesota spreads it and works it into the top 4 to 6 inches before planting. Minnesota adds a table for fruits, trees, and shrubs. See the rate tables.
New lawns, and established lawns that test low
The University of Minnesota recommends phosphate before seeding or sodding a new lawn, and a small yearly amount on an established lawn only where the soil tests 25 ppm Bray-P1 (18 ppm Olsen-P) or less, applied after core aeration in late summer or early fall.
Starter bands for row crops and vegetables
The California Crop Fertilization Guidelines (CDFA and UC Davis) name MAP 11-52-0 as a popular starter fertilizer for corn, banded 2 inches to the side of and 2 inches below the seed. They prefer MAP to diammonium phosphate (DAP) for starters, because DAP has a higher salt index and gives off free ammonia, which is toxic to seedlings.
Orchards, on a leaf or soil test
For almonds, the California guidelines call phosphorus deficiency uncommon and judge phosphorus from July leaf samples (0.1 to 0.3% P is adequate) and soil tests. Phosphorus can be drilled 6 to 8 inches deep in bands beside the tree row; broadcasting is less effective.
Where it is a poor fit
Soil that already tests high in phosphorus. Iowa State and Minnesota recommend no garden phosphate above 25 ppm (Bray-P1) or 18 ppm (Olsen-P). Minnesota warns that excess phosphorus on high-testing soils can degrade water quality.
Fertigation, drip, foliar sprays, and hydroponics. The Safety Data Sheet says not to use this grade in fertigation or foliar systems. For nutrient solutions, use the water-soluble Monoammonium Phosphate 12-61-0.
Side-dressing plants that are already growing. Phosphorus moves very little in soil. The California processing tomato guideline applies phosphorus before or at planting, and Minnesota works it into the soil rather than leaving it on the surface. This page gives no side-dress rate.
Contact with seed, or bands in a home garden. The California lettuce guideline says high-analysis fertilizers such as 11-52-0 can inhibit seedlings because of their concentrated salts, so bands sit a safe distance from the plants. Minnesota calls banding near the seed risky for home gardeners because it can burn seedlings or inhibit germination; gardeners spread it and mix it in.
Phosphorus shortage caused by soil pH. The California guidelines note that phosphorus availability is greatly reduced in acidic and alkaline soils, and recommend correcting soil pH rather than applying large amounts of phosphorus. Where free lime makes that impractical, go by a soil test and band phosphorus near the row, which they call normally more efficient than broadcasting.
A complete fertilizer. It supplies no potassium, calcium, magnesium, or micronutrients.
Lawns where phosphorus is restricted. Minnesota’s law, as the University of Minnesota described it in 2008, allows phosphate on lawns mainly during a new lawn’s establishment year or where a soil or tissue test shows a need. Check your state and local rules.
Certified organic production. It is a manufactured mineral fertilizer, and we do not sell it for certified organic production.
Application rates & directions
Phosphorus recommendations are written as pounds of phosphate (P₂O₅). To convert one to this product, divide by 0.52: pounds of product = pounds of P₂O₅ ÷ 0.52. The tables below already do that. Weigh the product, base the amount on a current soil test, apply it once, and retest before adding more.
Test first. Iowa State Extension notes that a soil test provides the information to determine recommended fertilizer rates. The University of Minnesota uses the Bray-P1 test on soils at pH 7.4 or below and the Olsen-P test above pH 7.4, and notes that the two tests give different numbers, so read the column for the test your lab ran.
Garden beds by soil test (Iowa State and University of Minnesota Extension)
Phosphate for vegetable and flower gardens by soil-test phosphorus (Iowa State Extension; University of Minnesota BU-01731, Table 23), with the weight of this 11-52-0 product that supplies it
Bray-P1 test (ppm)
Olsen-P test (ppm)
Phosphate to apply (lb P₂O₅ per 100 sq ft)
This product per 100 sq ft
This product per 1,000 sq ft
0–5
0–3
0.40
349 g (0.77 lb)
7.69 lb (3,489 g)
6–10
4–7
0.30
262 g (0.58 lb)
5.77 lb (2,617 g)
11–15
8–11
0.20
174 g (0.38 lb)
3.85 lb (1,745 g)
16–25
12–18
0.10
87 g (0.19 lb)
1.92 lb (872 g)
Over 25
Over 18
0
None
None
Apply it in fall or spring, before planting. For annual beds and new perennial beds, Minnesota spreads the phosphate evenly and works it into the top 4 to 6 inches; around established perennials, it spreads it around the plants and works it lightly into the soil. Each 100 sq ft at the top rate also receives 38 g of ammoniacal nitrogen, so count it toward the bed’s nitrogen. This table comes from the Upper Midwest and is not split by crop. Critical levels differ by crop and season: the California lettuce guideline suggests a small starter for winter and spring lettuce at Olsen-P levels up to about 55–60 ppm, far above this table’s cutoff. If your lab or state Extension service gives a phosphate recommendation in pounds of P₂O₅, use that number with the formula above.
Fruits, trees, and shrubs by soil test (University of Minnesota)
Phosphate for fruits, trees, and shrubs by soil-test phosphorus (University of Minnesota BU-01731, Table 27), per area fertilized, with the weight of this 11-52-0 product that supplies it
Bray-P1 test (ppm)
Olsen-P test (ppm)
Phosphate to apply (lb P₂O₅ per 100 sq ft)
This product per 100 sq ft
This product per 1,000 sq ft
0–5
0–3
0.20
174 g (0.38 lb)
3.85 lb (1,745 g)
6–10
4–7
0.10
87 g (0.19 lb)
1.92 lb (872 g)
11–25
8–18
0.05
44 g (0.10 lb)
436 g (0.96 lb)
Over 25
Over 18
0
None
None
Minnesota applies the rate to the area actually fertilized. For a new planting where the whole area is cultivated, such as a berry bed, a hedge, or a group of trees, spread it and work it into the top 4 to 6 inches before planting. Around established plants, spread it evenly in fall or spring and work it lightly into the soil. For established trees in a lawn, Minnesota places it in holes 12 to 18 inches deep and about 2 feet apart, from at least 3 feet out from the trunk to 2 feet beyond the branch tips, dividing the amount equally among the holes. This table comes from the Upper Midwest; if your lab or state Extension service gives a phosphate (P₂O₅) recommendation, use that number with the formula above.
Lawns by soil test (University of Minnesota)
Phosphate for a new lawn before seeding or sodding (University of Minnesota BU-01731, Table 11) and the yearly phosphate for an established lawn (Table 15), per 1,000 sq ft, with the weight of this 11-52-0 product that supplies it
Bray-P1 test (ppm)
Olsen-P test (ppm)
New lawn (lb P₂O₅)
This product, new lawn
Established lawn, per year (lb P₂O₅)
This product, established lawn
0–10
0–7
5
9.62 lb (4,361 g)
1.0
1.92 lb (872 g)
11–25
8–18
2
3.85 lb (1,745 g)
0.5
436 g (0.96 lb)
Over 25
Over 18
1
1.92 lb (872 g)
0
None
For a new lawn, work it into the soil before seeding or sodding; at the top new-lawn rate it also supplies about 1.1 lb of nitrogen per 1,000 sq ft, so count it toward the starter nitrogen. For an established lawn, apply it no more than once a year: Minnesota recommends spreading it after core aeration in late summer or early fall, so granules fall into the holes near the roots. Sweep any granules off driveways and walks back onto the lawn. This table comes from the Upper Midwest; if your lab or state Extension service gives a phosphate recommendation, use that number with the formula above. Some states and cities restrict phosphorus on lawns; Minnesota’s law, as the University of Minnesota described it in 2008, allows it mainly during a new lawn’s establishment year or where a soil or tissue test shows a need.
California field and vegetable crops (California Crop Fertilization Guidelines)
Phosphate guidelines per acre from the CDFA–FREP and UC Davis California Crop Fertilization Guidelines (Olsen, or bicarbonate, soil test), with the weight of this 11-52-0 product that supplies it
Crop and soil test
Guideline (lb P₂O₅ per acre)
This product per acre
Processing tomato, Olsen-P below 10 ppm
60–100
115–192 lb
Processing tomato, 10–20 ppm
50–80
96–154 lb
Processing tomato, above 20 ppm
Unlikely to respond; a small starter may help root growth in cold soil
No rate given
Lettuce, below 10 ppm
Up to 200 may be needed, especially when soil is below 60 °F
Up to 385 lb
Lettuce, 30–40 ppm
No more than 100
No more than 192 lb
Lettuce starter, winter or spring, 40 to 55–60 ppm
20
38 lb
Corn starter at planting, high-yielding corn
40–60, in a band
77–115 lb
Corn, Olsen-P above 12 ppm
Unlikely to respond
No rate given
These are California field guidelines, not home-garden rates. The tomato figures are the total for the year, including any starter; the guideline applies most preplant phosphorus in a band and places a starter band 1 to 2 inches below the seed.
The lettuce guideline bands about 2 inches below and 2 inches to the side of the seed row and gives no figure between 10 and 30 ppm. The corn guideline bands starter 2 inches to the side of and 2 inches below the seed to prevent salt damage, and keeps the nitrogen plus potash (N + K₂O) in that band to 70–80 lb per acre or less; 77–115 lb of this product supplies 8.5–12.7 lb of nitrogen. This page gives no rate for placing it in the seed furrow.
Orchards. The California almond guideline calls phosphorus deficiency uncommon and notes that there are no University of California phosphorus recommendations for almond orchards. Where soil and leaf tests show intermediate phosphorus, it replaces what harvest removes, about 18–20 lb of P₂O₅ per 1,000 lb of kernels (35–38 lb of this product), with more where tests are low and less where they are high. Phosphorus can be drilled 6 to 8 inches deep in one or two bands on opposite sides of the tree row; broadcasting is less effective than strip or ring applications at the drip line. For young trees, it keeps granular fertilizer at least 18 inches from the trunk, inside the irrigated area.
From a soil test report
Formula. Pounds of this product = pounds of P₂O₅ your report calls for ÷ 0.52. If the report gives pounds per acre, divide by 43.56 for pounds per 1,000 sq ft. For example, 60 lb of P₂O₅ per acre is 115 lb of this product per acre, supplying 12.7 lb of nitrogen. Apply it the way the report says: mixed into the soil before planting, or banded at planting.
Your package label
This page gives university rates matched to your soil test and does not restate the directions printed on your package. If the directions on your package differ from this page, email questions@greenwaybiotech.com before applying.
Uses with no rate on this page
This page gives no rate for side-dressing plants that are already growing, for containers, potting mixes, or houseplants, for placement in the seed furrow, or for fertigation, drip, foliar sprays, or hydroponics. For nutrient solutions, the water-soluble Monoammonium Phosphate 12-61-0 page gives weighed solution rates. For anything else, email questions@greenwaybiotech.com with your plants, growing method, and soil test.
How to use Monoammonium Phosphate 11-52-0
Test the soil. Get a soil test that reports phosphorus. Skip phosphorus on soil that tests high.
Find the amount and weigh it. Use the tables or the calculator, and weigh the product on a postal or platform scale you keep for garden products.
Spread it evenly. Use a drop or rotary spreader for lawns and large areas, or spread it by hand over a bed. Keep it off leaves, seeds, and pavement.
Mix it in or band it. Before planting, work it into the top 4 to 6 inches. Around established plants, work it lightly into the soil. On established lawns, spread it after core aeration. For row crops, band it 2 inches to the side of and 2 inches below the seed.
Water, then retest before repeating. Water or irrigate after spreading. Treat each table amount as one application, and retest the soil before adding phosphorus again.
Calculator & choosing a size
Formulas. Beds, trees, and shrubs: pounds of product = square feet ÷ 100 × the lb of P₂O₅ per 100 sq ft for your soil test ÷ 0.52. Lawns: pounds of product = square feet ÷ 1,000 × the lb of P₂O₅ per 1,000 sq ft for your soil test ÷ 0.52. Soil test reports: pounds of product = pounds of P₂O₅ recommended ÷ 0.52. Multiply pounds by 453.6 for grams.
Worked examples.
A 200 sq ft vegetable bed testing 8 ppm Bray-P1 (0.30 lb P₂O₅ per 100 sq ft): 200 ÷ 100 × 0.30 ÷ 0.52 = 1.15 lb (523 g) of product, supplying 58 g of nitrogen; a 2 lb bag covers it.
A 150 sq ft berry bed testing 6 ppm Olsen-P (0.10 lb P₂O₅ per 100 sq ft): 131 g (0.29 lb); a 2 lb bag covers it.
A new 1,000 sq ft lawn testing 5 ppm Olsen-P (5 lb P₂O₅ per 1,000 sq ft): 9.62 lb (4,361 g); a 10 lb bag covers it.
A 2,000 sq ft plot whose soil test calls for 80 lb P₂O₅ per acre: 80 ÷ 0.52 × 2,000 ÷ 43,560 = 7.06 lb (3,204 g); a 10 lb bag covers it.
What each bag covers in one application: a garden bed testing 6–10 ppm Bray-P1 or 4–7 ppm Olsen-P (0.58 lb of product per 100 sq ft), or an established lawn testing 0–10 ppm Bray-P1 or 0–7 ppm Olsen-P (1.92 lb of product per 1,000 sq ft)
Bag size
Garden bed
Established lawn
2 lb (907 g)
340 sq ft
1,040 sq ft
5 lb (2,268 g)
860 sq ft
2,600 sq ft
10 lb (4,536 g)
1,730 sq ft
5,200 sq ft
25 lb (11,340 g)
4,330 sq ft
13,000 sq ft
50 lb (22,680 g)
8,660 sq ft
26,000 sq ft
The calculator below asks what you are fertilizing and, depending on your answer, the area and your soil-test phosphorus, or the phosphate your soil test report calls for. It applies the rate from the tables above, states the phosphate and nitrogen supplied, and recommends the smallest bag that covers one application, plus a lower-price combination of bags when one exists. 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 rate tables and formulas above to choose a size.
How monoammonium phosphate works in soil
In moist soil, a granule dissolves into ammonium and phosphate. IPNI notes that monoammonium phosphate dissolves quickly when the soil has adequate moisture, and that the solution around the dissolving granule is moderately acidic, which it says makes MAP especially desirable in neutral and alkaline soils. IPNI adds that under most conditions there are no significant differences in phosphorus nutrition among commercial phosphate fertilizers, and that MAP can be placed near seed without concern for ammonia damage. The California guidelines likewise prefer MAP to DAP for starters, but add that MAP may damage sensitive seedlings in high concentrations.
Once dissolved, phosphate moves very little. The University of Minnesota explains that phosphorus forms insoluble compounds and barely moves in soil, which is why it should be worked in rather than left on the surface. In alkaline soils, phosphorus from fertilizers such as monoammonium phosphate usually reacts with calcium to form calcium phosphate minerals (Midwest Vegetable Production Guide), and the California guidelines add that phosphorus is less available in cold, wet soils and where free lime is present. Banding phosphorus near the plant row is normally more efficient than broadcasting it, according to the California guidelines.
Phosphorus-deficient plants are often stunted, with thin stems and dull, dark green or gray-green leaves, and some crops show only stunted growth, so the California guidelines use soil and tissue tests to confirm a suspected deficiency. More is not better: Colorado State Extension notes that excessive phosphorus fertilizer can aggravate iron and zinc deficiencies. This describes phosphorus nutrition in general; it is not a trial of this finished product.
Compare your options
Match the product to how you will apply it and what your soil test shows. Analyses are each product’s guarantee as shown on its page.
Monoammonium Phosphate 11-52-0 compared with other Greenway phosphorus sources
Option
Supplies
Choose it when
Limitation
Monoammonium Phosphate 11-52-0, this product
52% P₂O₅, 11% ammoniacal N; granular
You are spreading or banding phosphorus on soil
Not for fertigation, drip, foliar sprays, or hydroponics; no potassium
You are amending beds and prefer a bone-based phosphorus source
Supplies less than a third as much phosphate per pound; follow the directions on its page
Related products & compatibility
Monoammonium phosphate supplies phosphorus and a little nitrogen. These products can be used in the same program, meaning the same field or bed in the same season, when your crop and soil test call for them. They are not all required.
Urea Fertilizer 46-0-0: nitrogen for the season. A garden bed at the table rates also receives 10–38 g of nitrogen per 100 sq ft from this product, so count it toward the season’s nitrogen.
Chelated Zinc EDTA Fertilizer 14% Zn: only where a soil or tissue test shows a need. Excess phosphorus can aggravate zinc deficiency (Colorado State Extension).
Mixing. Spread each product separately at its own rate, and do not mix them in one container. The Safety Data Sheet says not to mix this product directly with calcium-containing fertilizers such as calcium nitrate in concentrated form, because they form insoluble calcium phosphate. Do not dissolve it for injection; use the water-soluble grade for solutions.
Handling, storage & limitations
WARNING: This product can expose you to cadmium, which is 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.
Hazards. Not classified as hazardous under OSHA’s Hazard Communication Standard, according to the Safety Data Sheet. Dust from handling can irritate the eyes, skin, nose, and throat.
Protective equipment. Wear safety glasses with side shields and chemical-resistant gloves such as nitrile or neoprene. Wear chemical splash goggles if dust is heavy. Avoid breathing dust; if dust levels are high, the Safety Data Sheet calls for an N95 dust mask or a respirator with P100 filters. Wash your hands and face after handling, and do not eat, drink, or smoke while using it.
Storage. Keep it in the original sealed container in a cool, dry place, away from direct sunlight, heat, children, and pets. It absorbs moisture, so reseal it tightly after each use to prevent caking. Keep it away from strong acids, alkalis, oxidizers (including hydrogen peroxide), and halogenated compounds.
Heat and spills. It does not burn, but above 190 °C (374 °F) it decomposes and can release nitrogen oxides, sulfur oxides, phosphorus oxides, and ammonia. Sweep up spills and keep the product out of drains, sewers, and waterways, and do not spread it next to waterways: phosphorus runoff feeds algae growth in lakes and streams.
Use limits. Apply it to soil only, weigh every application, base it on a soil test, and skip phosphorus on soil that tests high. Keep granules off seeds, stems, and leaves, and do not place it in the seed furrow. It is not a complete fertilizer.
First aid. Eyes: flush with clean water for at least 15 minutes, lifting the eyelids, and remove contact lenses; get medical attention if irritation persists. Skin: remove contaminated clothing and wash with soap and water; get medical attention if symptoms occur. Inhaled: move to fresh air; get medical attention if symptoms persist. Swallowed: rinse the mouth with water, do not induce vomiting unless told to by medical personnel, never give anything by mouth to an unconscious person, and call Poison Control at 1-800-222-1222 or get medical attention immediately.
Emergency number from the Safety Data Sheet. CHEMTREC 1-800-424-9300, 24 hours.
Frequently asked questions
What is the difference between MAP 11-52-0 and MAP 12-61-0?
Both are monoammonium phosphate. 11-52-0 is the granular grade, with 52% available phosphate (P₂O₅) and 11% ammoniacal nitrogen, made for spreading and banding on soil; its Safety Data Sheet says not to use it in fertigation or foliar systems. 12-61-0 is the water-soluble grade, with 61% P₂O₅ and 12% nitrogen, for nutrient solutions and fertigation.
How much should I use in my vegetable garden?
Go by a soil test. Iowa State and University of Minnesota Extension recommend 0.40 lb of P₂O₅ per 100 sq ft on the lowest-testing soils (Bray-P1 0–5 ppm or Olsen-P 0–3 ppm), stepping down to 0.10 lb at 16–25 ppm Bray or 12–18 ppm Olsen, and none above that. In this product, that is 349 g down to 87 g per 100 sq ft. Apply it once, before planting, and work it into the top 4 to 6 inches.
Can I use it on my lawn?
Yes, where a soil test shows a need and local rules allow it. The University of Minnesota recommends 1 to 5 lb of P₂O₅ per 1,000 sq ft before seeding or sodding a new lawn, depending on the soil test, which is 1.92 to 9.62 lb of this product. For an established lawn it recommends 0.5 to 1.0 lb of P₂O₅ per 1,000 sq ft a year, only on soils testing 25 ppm Bray-P1 (18 ppm Olsen-P) or less (436 g to 1.92 lb of this product), spread after core aeration in late summer or early fall. Some states, including Minnesota, restrict phosphorus on lawns, so check your local rules.
Can I use it in a drip system, sprayer, or hydroponic reservoir?
No. This granular grade is for soil application, and its Safety Data Sheet says not to use it in fertigation or foliar systems. For nutrient solutions, drip injection, or hydroponics, use the water-soluble Monoammonium Phosphate 12-61-0.
How do I convert my soil test recommendation to pounds of this product?
Divide the P₂O₅ recommendation by 0.52. For example, 60 lb of P₂O₅ per acre is 60 ÷ 0.52 = 115 lb of this product per acre, which also supplies 12.7 lb of nitrogen. For a recommendation per acre, divide by 43.56 for pounds per 1,000 sq ft. The calculator on this page does the math.
Can I side-dress tomatoes and peppers with it?
This page gives no side-dress rate. Phosphorus moves very little in soil, so it belongs in the root zone before or at planting: the California processing tomato guideline applies phosphorus preplant or at planting, and the University of Minnesota works it into the soil rather than leaving it on the surface. Test the soil before the next planting and work in what the test calls for.
Is it a good choice for alkaline soil?
It can be. IPNI notes that the solution around a dissolving MAP granule is moderately acidic, which it says makes MAP especially desirable in neutral and alkaline soils. In alkaline soils, though, phosphorus still reacts with calcium, and the California guidelines say phosphorus is less available where free lime is present and recommend correcting soil pH rather than applying large amounts of phosphorus. Where free lime makes that impractical, go by a soil test and band phosphorus near the row, which the California guidelines call normally more efficient than broadcasting.
How do I use it as a starter fertilizer for row crops?
Band it at planting, 2 inches to the side of and 2 inches below the seed. The California corn guideline names MAP 11-52-0 as a popular starter, gives 40–60 lb of P₂O₅ per acre in a band for high-yielding corn (77–115 lb of this product), and keeps nitrogen plus potash in the band to 70–80 lb per acre or less. Corn on soil testing above 12 ppm Olsen-P is unlikely to respond. This page gives no rate for placing it in the seed furrow.
Can I use it on fruit trees?
Where a soil test shows a need. The University of Minnesota recommends 0.05 to 0.20 lb of P₂O₅ per 100 sq ft for fruits, trees, and shrubs on soils testing 25 ppm Bray-P1 or less, which is 44 to 174 g of this product per 100 sq ft of the area fertilized, and none above that. For almond orchards, the California guidelines call phosphorus deficiency uncommon and judge phosphorus from July leaf samples and soil tests.
Is it organic?
No. It is a manufactured mineral fertilizer, and we do not sell it for certified organic production. If you farm under organic certification, your certifier decides which inputs you may use.
Safety Data Sheet (PDF): composition, hazards, handling, storage, first aid, and emergency numbers.
Where the rates and statements on this page come from
The garden, tree, lawn, field, and orchard figures on this page come from the university and agency publications below; the composition, hazard, storage, and first-aid statements come from the label and Safety Data Sheet above. They are listed for growers, advisors, and anyone who wants to check them. The publications explain phosphorus nutrition in general; they do not evaluate or endorse this product.
CDFA Fertilizer Research and Education Program and UC Davis, California Crop Fertilization Guidelines: Processing Tomato, Lettuce, Corn, Almond, and Annual Crops in General: the per-acre guidelines, starter rates and band placement, the band limit for nitrogen and potash, MAP 11-52-0 as a corn starter, MAP compared with DAP, salt injury to seedlings, banding compared with broadcasting, phosphorus availability by soil pH, temperature, and free lime, deficiency symptoms, and orchard leaf analysis and placement.
Not sure whether your soil needs phosphorus, or how much? Email your crop or plants, the area, and your soil test results 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.
Every order carries a 90-day satisfaction guarantee, and we pack and ship from Madera, California. You can also choose a package weight from the size selector at the top of this page.
Greenway Biotech, Inc. is a family-owned company that has blended and packaged specialty fertilizers and soil amendments in California since 1989, today from Madera.
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