SITE SPECIFIC MANAGEMENT OF NITROGEN FERTILIZER IN RICE FIELD (BRRI Dhan 29)

Abstract

A field experiment was carried out at Soil Science research field, Hajee Mohammad Danesh Science and Technology University, Dinajpur, during the period from December, 2016 to April, 2017 to assess the effect of split application of nitrogen fertilizer on growth, yield of BRRI dhan 29. The experiment consisted of 5 nitrogen levels viz., T0 (without fertilizer), Farmer's practice (225 kg ha-1 at 3 equal splits, 1/3 at 0 DAT (Day After Transplanting) + 1/3 at 30 DAT+ 1/3 at 70 DAT ), T1 (225 kg ha-1 , at 5 equal splits, 1/5 at 0 DAT+1/5 at 28 DAT+1/5 at 45 DAT+1/5 at 60 DAT+1/5 at 75 DAT) and T2 (225 kg/ha, at 4 equal splits, 1/4 at 0 DAT +1/4 at 30 DAT + 1/4 at 50 DAT+1/4 at 70 DAT), T3 (200 kg ha-1 , at 3 equal splits,1/3 at 0 DAT+1/3 at 30 DAT+1/3 at 70 DAT). Plant height, number of tiller hill-1 were recorded at 35 DAT, 45 DAT, 55 DAT, 65 DAT, 75 DAT 85 DAT and also at maturity. At harvest, data on plant height, number of panicle hill-1 , length of panicle, number of filled grains panicle-1 , number of unfilled grains panicle-1 , 1000-grain weight, grain yield, straw yield, biological yield hill-1 , total N, available P, exchangeable K and also protein content were recorded in grain and straw. The effect of different split application of N fertilizer was found statistically significant on all parameters studied at 35 DAT, 45 DAT, 55 DAT, 65 DAT, 75 DAT, 85 DAT and also at maturity stage except the unfilled grain panicle-1 and 1000-grain weight. At maturity the highest results of all parameters were found in T1, but incase of unfilled grains panicle-1 in FP was the highest. Number of panicles hill-1 in FP and T2 was statistically similar. The highest value of protein content was recorded in the treatment T1, which statistically dissimilar to others. Lowest protein content in T0. Protein content in FP,T2 and T3 was statistically similar. Unfilled grains panicle-1 was similar in T1 and T2. 1000 grain weight was statistically similar in T0, FP and T2 but highest in T1 and lowest in T3. From the above results it was revealed that full dose of urea T1 (1/5 at 0 DAT+1/5 at 28 DAT+1/5 at 45 DAT+1/5 at 60 DAT+1/5 at 75 DAT) was more effective than the other split application. So the recommendation of this research was that 225 kg ha-1 of urea at 5 equal splits, 1/5 at 0 DAT+1/5 at 28 DAT+1/5 at 45 DAT+1/5 at 60 DAT+1/5 at 75 DAT should be applied for BRRI dhan 29 for better yield and this dose was also economically feasible.