ZINC AND PHOSPHORUS INTERACTION IN SUBMERGED PADDY

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Abstract
The effect of a Zn and P interaction on the yield of paddy [Oryza sativa cv. IR-8] and the concentration and uptake of Zn and P in greenhouse experiments at Haryana Agricultural University [Hissar, India] were studied. Zn was applied as ZnSO4.cntdot.7H2O at the rate of 0, 5, 10 and 20 ppm, and P, as KH2PO4, was applied at the rate of 0, 25, 50 and 100 ppm. Five and 10 ppm of applied Zn increased the straw and grain weight when P was not added, but when P was added only 5 ppm added Zn responded. Zn concentration and uptake increased with the application of Zn and decreased with the application of P. The rice husk (seed coat) contained the highest concentration of Zn (38.8 ppm), while rice grain contained the lowest (21.0 ppm). The uptake of Zn was highest in straw, followed by grain and then husk. The P concentration and uptake in rice plants increased with increasing levels of applied P and decreased with increasing levels of applied Zn. The highest concentration (4750 ppm) and uptake (62.4 mg/pot) of P was observed in rice grain; the next highest concentrations occurred in straw and then husk. Concentration and uptake of Zn and P were lower in the presence of CaCO3 than in its absence. About 7% Zn was absorbed up to the tillering stage, and about 46% between tillering and heading. Between heading and maturity, about 47% Zn was absorbed. At maturity, 55% Zn was retained in straw, 24% in grain and about 21% in grain husk. When more Zn was applied, less Zn was translocated to grain; when more P was applied, more Zn was translocated to grains. The effects of P and Zn on P distribution were the opposite. The absorption of P between sowing and tillering was 7% and between tillering and heading about 56%. At maturity, about 65% P was retained in grain, about 27% in straw, and only about 7% in grain husk.

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