Effect of Phosphorus and Zinc on yield and their uptake by rice

A pot experiment was conducted to study the interaction effects of four levels of P (0,25,50 and 100 mg kg-1 soil) and five levels of Zn (0, 5, 10, 15 and 25 mg kg-1 soil) on rice in an Inceptisol. The available P content was very low in the soil and it was moderately deficient in Zn. Rice plants which did not receive P showed symptoms of P deficiency characterized by narrow short leaves with dark green colour. Significant increase in grain and straw yields was noted upto 10 mg Zn kg-1 soil addition while yield increase occurred at all levels of added P. The interaction revealed that Zn uptake increased only upto 10 mg Zn kg-1 over all the levels of P and it decreased thereafter. A decrease in P uptake was noted at higher levels of Zn addition. Zinc-P interaction showed as antagonistic effect in terms of decline in yield and uptake of both the nutrients at the highest levels of their additions.


Author : V. Sarkunan and A.K. Misra