Deficiency in corn causes a shortening of the internodes of corn and a severe stunting.A typical zinc-deficient plant is shown in Figure 9. When the deficiency is severe, many corn plants will die in the seedling stage, with those recovering exhibiting several different colorations and symptoms ranging from a lack of green color in the upper leaves to interveinal striping in the upper leaves. Severe zinc deficiency in corn is known as "white bud."Zinc deficiencies are corrected by soil applications of zinc sulfate and zinc chelates in the case of row crops, and by spray as well as soil applica-

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By fusing a mixture of rock phosphate, magnesia, and silica, and rapidly cooling the melt, it is possible to make a product with a high proportion of its P2O5 content soluble in citrated ammonium nitrate solution.

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