Effects of Reduced Rates of N, P, K, S and Zn on the Growth and Yield of BRRI dhan49

The experiment was conducted at the west side of Bangladesh Rice Research Institute (BRRI), Gazipur during Aman season of 2012 to study the effects of reduced rates of different fertilizers on growth and yield of BRRI dhan49. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. There were seven treatments such as control, recommended fertilizer dose (RFD), 50% reduced rate of N, 50% reduced rate of P, 50% reduced rate of K, 50% reduced rate of S and 50% reduced rate of Zn. The grain and straw yields as well as biological yield of BRRI dhan49 were significantly affected due to different treatments. The highest grain yield of 6.16 t ha super(-1) was observed in the treatment 50% reduced rate of N which was statistically identical to those recorded in the treatments with recommended fertilizer dose and 50% reduced rate of P. Effective tillers hill super(-1), filled grains panicle super(-1), 1000-grains weight had also higher in the treatment 50% reduced rate of N and unfilled grains panicle super(-1) lower in the treatment 50% reduced rate of N However, plant height and panicle length had higher in 50% reduced rate of P. Therefore, the treatment 50% reduced rate of N fertilizer performed better than RFD and other treatments.