Interactions of Zn and P in tops and roots of corn were studied in Corning and Landlow soils and of tomato in Corning soil in greenhouse. Zn deficiency symptoms were seen in both crops. The Zn concentration in tops was reduced due to P application and the magnitude of reduction was greatest for the first increment of added P (25 ppm). The Zn concentration in roots was much less influenced by added P. The P concentration was reduced by first rate of 1 ppm Zn and the effect was primarily with higher rates of P. Added P increased P concentration in the top much more than in the roots. In the presence of P, added zinc increased the zinc concentration in corn roots more than in corn tops.
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Sharma et al. (1968) studied this question.