What crops are most vulnerable to zinc deficiency?

Crops susceptible to zinc deficiency have high zinc requirements and outstanding sensitivity to soil conditions. These crops exhibit unique symptoms in the absence of this micronutrient. They are susceptible due to physiological characteristics such as rapid growth rates and a lack of an efficient zinc uptake system. Knowing a crop's susceptibility can inform effective prevention methods.

Zinc deficiency affects corn drastically, displaying white midrib streaks and deformed tassels. Corn has a higher demand for zinc and requires about 50% more compared to other grains due to its rapid vegetative growth. Yield reduction due to deficiency during tasseling can exceed 40%. Soil concentration of zinc below 0.8 mg/kg induces symptoms within 3-5 weeks.

Vulnerability factors include the root structure and growth rate. Corn's shallow rooting is poor in topsoil that is deficient in zinc. Citrus trees have high zinc requirements for fruit growth. Beans suffer from zinc-phosphorus antagonism in fertilized fields. Apple rootstocks differ in zinc utilization efficiencies.

Safeguard sensitive crops through soil management. Retain pH at 6.0-6.5 when zinc remains available. Apply ZnSO4 preventatively: 5 lb/acre for corn, 3 lb/acre for beans. Use Zn-accumulating cover crops like sunflowers in rotation. Test soils yearly before planting new sensitive species.

Keep a close eye on high-risk areas. Monitor new growth every two weeks at the peak period. Sample leaves as soon as symptoms appear. Zinc in tissue sample tests should target a concentration of 25-150 ppm. The timing of applications is critical; an early deficiency can cause irreversible damage.

Read the full article: Zinc Deficiency Plants: Symptoms and Solutions