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

Paulsen, Gary M.; Rotimi, Olusegun A.

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

1968

Paulsen, Gary M. | Rotimi, Olusegun A.

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.

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