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Effect of Method of Incorporation of Zinc in Fertilizer on Zinc Uptake and Yield of Pea Beans (Phaseolus Vulgaris)¹

Dept. of Soil Science, Michigan State Univer., East Lansing

ABSTRACT

Incorporation of either ZnO or ZnSO₄ into fertilizer reduced the water solubility of Zn, the Zn uptake by pea beans, and the final yield as compared to the same rate and carrier of Zn hand mixed with fertilizer at planting time. Zn-EDTA chelate remained 100% water-soluble when coated on the fertilizer granule in conjunction with MnSO₄; however, it was only 40% water-soluble if coated in conjunction with MnO, and only 10% water-soluble if incorporated into the fertilizer granule. The reduced water solubility was reflected in the uptake of Zn and the yield of pea beans.

¹ Authorized for publication by the Director as Journal Article no. 3606 of the Michigan Agr. Exp. Sta., East Lansing. The authors wish to express their appreciation to the Tennessee Valley Authority for partial support of this work.

Received for publication June 9, 1965. Accepted for publication June 21, 1965.