EFFECT OF NITROGENOUS FERTILIZER AND GREEN MANURE ON TRANSPLANTED AMAN RICE

Abstract

The study was carried out at Shcr-e-Bangla Agricultural University (SAU) Farm to know the effect of N fertilizers (Urea) and green manure (Dhaineha) on T. Aman rice (Var. IIRRI dhan33) during August to December 2012. The experiment was laid out in a randomized complete block design with nine treatments and three replications. The treatments were T (140 kg N-Urea), 12 (120 kg N-Urea+20 kg N-GM), T, (100 kg N-Urea+40 kg N-GM), T 4 (80 kg N- Urea+60 kg N-GM), T 5 (60 kg N-lirca+80 kg N-GM). T (40 kg N-Urea± 100 kg N-GM) and T 7 (20 kg N-Urea+ 120 kg N-GM), T 8 (140 kg N-GM),T 9 (70 kg NUrea--70 kg N-GM). The result demonstrated that the yield contributing characters, grain and straw yields were significantly influenced by the added N fertilizers and green manure. Application of 80 kg N as urea and 60 kg N from green manure produced the highest grain yield (5.02 1 h15. In case of straw yield, the treatment T (60 kg N-Urea+80 kg N-GM) produced the highest yield (5.54 t hi'). The treatments 1 4 and T -s resulted in higher nutrient use efficiency along with higher N. P. K and S uptake by the T. Aman rice. The application of nitrogenous fertilizer with green manure influenced the nutrient concentration in rice grain and straw. The higher grain N were observed in i' (Recommended dose) plot and higher P, K and S concentrations were observed in the treatments with green manure plot. The combined use of N fertilizer and green manure resulted in considerable improvement in soil fertility. The application of N fertilizer along with green manure increased the total N, available P and available S and exchangeable K in post-harvest soils. The overall findings of the study indicate that the use of 80 kg N as urea (173.90 kg/ha) and 40 kg N from green manure (Dhaincha 2.71 1/ha) should be encouraged to replenish the deteriorating soil fertility and increased crop yield of T. Aman rice.