Effects of different sources of nitrogen on the nutrient uptake by rice and on soil fertility

An experiment was carried out at the Soil Science Field Laboratory of Bangladesh Agricultural University, Mymensingh during January to May 2006 to evaluate the effect of different organic sources of nitrogen on nutrient uptake by BRRI dhan 29 and on the fertility status of soil. The soil was silt loam having pH 6.48, organic matter 2.13%, total N 0.106%, available P 2.99 ppm, exchangeable K 0.116 me% and available S 20.58 ppm. The experiment was laid out in Randomized Complete Block Design with ten treatments and three replications. Poultry manure, cowdung, mustard oilcake, sesame oilcake, raintree, sissoo and acacia leaves were used as organic sources of N with or without chemical fertilizers. The application of various organic manures did not affect the N, P and S contents of rice grain and straw. However, the N, P, K and S uptake was significantly influenced. The different treatments under study influenced pH, organic matter content, total N, available P, exchangeable K and available S contents of the post-harvest soil. As regards to the contribution of various organic manures on soil properties and availability of nutrients, the performances of poultry manure, cowdung, raintree leaf litter and different manure combinations were good.