Soil Health · March 2025 · 6 min read
Micronutrient deficiencies often go unnoticed until yields are already compromised. Learning to recognize visual symptoms in the field and confirming with tissue tests allows you to correct problems before they become costly.
Zinc deficiency appears as interveinal chlorosis on young leaves and stunted internodes, commonly seen in corn on high-pH soils. Manganese deficiency creates a striped pattern on younger leaves of soybeans and small grains. Iron chlorosis turns new growth uniformly yellow while veins may remain green, especially in calcareous soils.
Tissue analysis confirms what visual symptoms suggest and reveals hidden hunger before symptoms appear. Collect the most recently matured leaf from at least fifteen to twenty plants across the field for a representative sample. Compare results to established sufficiency ranges for the specific crop and growth stage.
Foliar applications of chelated micronutrients provide the fastest response when deficiencies are identified during the growing season. Soil-applied zinc sulfate or manganese sulfate can build long-term reserves when broadcast before planting. Adjusting soil pH is often the most effective long-term fix, since many micronutrient deficiencies stem from pH-induced unavailability.
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