Phosphorus-Zinc Interaction in Two Soybean Varieties Differing in Sensitivity to Phosphorus Nutrition1
- Gary M. Paulsen and
- Olusegun A. Rotimi2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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