Grain yield and quality of aromatic Boro rice (cv. BRRI dhan50) subject to date of transplanting and nutrient management

Abstract

The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from December 2015 to May 2016 to find out the effect of date of transplanting and nutrient management on the yield and quality of aromatic Boro rice cv. BRRI dhan50. The experiment comprised five dates of transplanting, viz., 15 December, 30 December, 15 January, 30 January and 15 February, and four nutrient managements, viz., recommended dose of inorganic fertilizer (N, P, K, S and Zn at the rate of 115, 25, 60, 18, 3.5 kg ha–1, respectively), poultry manure 5 t ha–1, 25% less than the recommended dose of inorganic fertilizer +2.5 t ha–1 poultry manure, 50% less than the recommended dose of inorganic fertilizer +2.5 t ha–1 poultry manure. The experiment was laid out in a randomized complete block design with three replications. Crop characters, yield components, and yield quality were significantly influenced by date of transplanting, nutrient management and their interactions. The highest number of effective tillers hill–1, number of grains panicle–1, grain yield and grain protein content were recorded when the crop was transplanted on 15 December. Yield components, grain yield and grain protein content gradually decreased due to delay in transplanting. In case of nutrient, the highest number of effective tillers hill–1, number of grains panicle–1, 1000–grain weight, grain yield, grain protein content and aroma level were recorded when the crop was fertilized with 25% less than recommended dose of inorganic fertilizer +2.5 t ha–1 poultry manure. Similarly, the highest grain yield was also recorded when fertilized with 25% less than recommended dose of inorganic fertilizer +2.5 t ha–1 poultry manure and transplanted on 15 December 2015 which was at par with on 15 December 2015 transplanting and fertilized with the recommended dose of inorganic fertilizer. Early transplanting on 15 December 2015 and fertilization with 25% less than recommended dose of inorganic fertilizer +2.5 t ha–1 poultry manure was found to be promising practice for the cultivation of BRRI dhan50 under Old Brahmaputra Floodplain Soils of Bangladesh.