Effect of level of nitrogen and date of transplanting on the yield and yield attributes of transplant aman rice under SRI method

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during the period from July to December 2003. The experiment consisted of two factors, four levels of nitrogen viz., (i) control (0 kg nitrogen ha-1), (ii) 40 kg nitrogen ha-1 (50% of the BRRI recommended dose), (iii) 80 kg nitrogen ha-1 (100% of the BRRI recommended dose) and (iv) 120 kg nitrogen ha-1 (150% of the BRRI recommended dose) and four dates of transplanting viz., (i) 15 July, (ii) 30 July, (iii) 14 August and (iv) 29 August 2003. Nitrogen level had significant effect on plant height, total tillers hill-1 and grain yield. The highest grain yield was recorded from the application of 80 kg nitrogen ha-1(100% of the recommended dose). Date of transplanting had significant effect on all the yield and yield contributing characters of rice except straw yield and harvest index. The highest grain yield was recorded from 30 July transplanting. Eighty-kg nitrogen coupled with 30 July transplanting produced the highest grain yield of transplant aman rice cv. BRRI dhan31.