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Phosphorus-Zinc Interaction in Two Soybean Varieties Differing in Sensitivity to Phosphorus Nutrition¹

ABSTRACT

Two soybean varieties (Glycine max (L.) Merr.) differing in sensitivity to phosphorus nutrition were grown in nutrient solutions containing various levels of P and Zn. Low P levels decreased growth and P concentration in leaves more than in other plant parts. High P levels decreased growth of the P-sensitive variety more than the P-tolerant variety but decreased Zn concentration in both varieties equally. Added Zn overcame the effect of P on the tolerant variety but not on the sensitive variety, indicating two different detrimental effects of P. Zinc deficiency affected growth of all plant parts similarly but had little effect on P content of plants except that when Zn was added to deficient plants P concentration in leaves decreased.

Interaction of P with Zn decreased Zn concentration of leaves most and roots least. The effect of P on Zn appeared to originate in the roots, however, and to occur on translocation of Zn to the upper plant parts.

¹ Contribution no. 993, Dept. of Agronomy, Kansas Agr. Exp. Sta.

² Assistant Professor and Special Student (now Lecturer Ahmadu Bello University, Zaria, N Nigeria), Dept. of Agronomy, Kansas State Univ., Manhattan.

Received for publication May 1, 1967. Accepted for publication October 2, 1967.