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Zinc deficiency presents distinct symptoms that appear on new growth first (zinc is immobile in plants):

• Interveinal chlorosis: Yellowing between leaf veins on young leaves
• Small, narrow leaves: Known as "little leaf" in trees
• Shortened internodes: Creates rosette appearance with clustered leaves
• Bronze or brown spots: Necrotic spots on leaves, especially in beans
• Delayed maturity: Slow growth and poor fruit/seed development
• White bud in corn: Young leaves emerge white or pale yellow

Most susceptible crops: Corn, rice, citrus, pecans, beans, and grapes. Deficiency is common in high pH soils (above 7.0), sandy soils, high phosphorus soils, and cool, wet conditions.

Chelated zinc EDTA offers significant advantages over zinc sulfate:

• pH stability: Remains available up to pH 7.0 (zinc sulfate precipitates above pH 5.5)
• 5-10x more efficient: Lower application rates needed for same effect
• No soil tie-up: Protected from phosphate and carbonate reactions
• Compatible mixing: Can be tank-mixed with most fertilizers and pesticides
• Longer residual: Stays available for extended periods
• Less phytotoxic: Gentler on plant tissues in foliar applications

While zinc sulfate is cheaper per pound, the superior efficiency of chelated zinc often makes it more economical per acre treated.

Timing considerations:

• Preventive: Apply pre-plant or at planting for susceptible crops
• Corrective: Apply immediately when deficiency symptoms appear
• Annual crops: Single application at planting usually sufficient
• Perennials: Apply in early spring before bud break

Application methods (ranked by effectiveness):

1. Banded soil application: Most efficient, place 2-3" beside and below seed
2. Foliar spray: Fast correction, apply to young leaves
3. Broadcast soil: Less efficient, requires higher rates
4. Seed treatment: Preventive for cereals

Best practices:

• Test soil - critical level is 0.5-1.0 ppm DTPA-extractable Zn
• Avoid over-liming which induces deficiency
• Don't overapply - zinc can be toxic at high levels
• Monitor tissue levels: 20-60 ppm is optimal for most crops