VARIETAL PERFORMANCE OF BORO RICE UNDER NPK BRIQUETTE FERTILIZATION

Abstract

A research work was carried out at the Research Farm of Sher-e-Bangla Agricultural University, Dhaka during the period from November 2016 to May 2017 in order to determine the suitable fertilizer doses to observe the growth performance with a view to increasing the grain yield of boro rice. The experiment consisted of two factors. Factor A: Variety (2 levels); V 1 : BRRI dhan28, V 2 : BRRI dhan29 and factor B: Fertilizer doses (5 levels); T 1 = Control, T 2 = Recommended Fertilizer Dose, T 3 = 2 NPK briquette of 2.40 gm sized, T 4 = 2 NPK briquette of 2.40 gm+1 top dressing at tiller stage @ 1⁄4 of nitrogenous fertilizer, T 5 = 1 NPK briquette of 2.40 gm + 1 top dressing at tiller stage @ 1⁄4 of nitrogenous fertilizer. The experiment was set up by following Randomized Complete Block Design with three replications. Experimental results showed that fertilizer doses had significant effect on plant height, tillers hill -1 , effective tillers hill -1 , non-effective tillers hill

iii -1 , grains panicle , unfilled grains panicle -1 , grain yield, straw yield, biological yield and harvest index. The application of T 4 treatment showed the highest grain yield (8.65 t ha ) and straw yield (10.41 t ha -1 ) than any other sources of nitrogen treatments. All the studied characters except weight of thousand grains varied significantly due to varieties. BRRI dhan29 gave the higher grain yield (7.98 t ha ) than BRRI dhan28 (7.20 t ha -1 ) which is mainly attributable to the highest number of grains panicle -1 (98.63). The combination of the 10 treatments and BRRI dhan29 had the higher performance in terms of producing the highest grain yield (9.34 t ha -1 ) and straw yield (10.54 t ha -1 ) among the interaction effects. The N, P and K uptake both in grain and straw of boro rice increased significantly due to application of nitrogen fertilizer. Research findings revealed that application of 2 NPK briquette of 2.40 gm sized in middle of 4 heel+1 top dressing at tiller stage @ 1⁄4 of nitrogenous fertilizer showed the superiority over the other sources of nitrogen to produce higher grain yield of boro rice. In addition, interaction treatment of V 2 x T 4 i.e. application of 2 NPK briquette of 2.40 gm sized in middle of 4 heel+1 top dressing at tiller stage @ 1⁄4 of nitrogenous fertilizer with BRRI dhan29 performed the best and interaction of T 4 treatment with other tested varieties were also promising in producing higher yield.