Nutrient Uptake by Rice Under Different Soil Moisture Regimes

A pot experiment was conducted in kharif 1969–70 to study the effect of five soil moisture levels on yield and uptake of nutrients by three varieties of rice in medium black soil of Jabalpur. The differences among the uptake values of P, K, S and Fe in three varieties under study were non-significant. Differences in the yield and uptake of nutrients due to varying moisture regimes were significant. Rice when grown under submergence yielded significantly more than at other moisture levels. There was no significant difference between the grain and straw yields under 4 cm and 7 cm of flooding. The uptake of P and K was significantly increased in 4 cm of submergence over all the other treatments and followed the order: 7 cm of submergence>0 cm of water tension> 300 cm of water tension>700 cm of water tension. The same trend was observed in the uptake of Fe and S but difference between the uptake values of Fe and S was non-significant in 4 cm and 7 cm of submergence. The residual availability of P, K and S in soil at post harvest was found more in 300 and 700 cm of water tension as compared to 0 cm of water tension and submergence. Reverse trend was found with residual availability of Fe.