|Traditional Field Crops (Peace Corps, 1981, 283 p.)|
|Appendix G - Hunger signs in the reference crops|
Zinc deficiencies occur where soil pH is above 6.8 and high rates of P are used, especially if placed in a band or hole near the seeds.
Maize shows the most clear-cut zinc hunger signs of all crops. If severe, symptoms appear within two weeks of emergence. A broad band of bleached tissue on each side of the midribs of the upper leaves, mainly on the lower part of the leaves, is typical. The mid-rib and leaf margin stay green, and the plants are stunted. Mild shortages may cause a striping between the veins similar to manganese or iron deficiency. However, in Fe and Mn shortages, this interveinal striping runs the full length of the leaf.
Similar to maize, but less interveinal striping, and the white band is more defined.
Interveinal yellowing of the upper leaves.