Yield and Yield Components of Boro Rice as Influence by Nitrogen Application Methods and Weed Management

Abstract

Two consecutive field experiments were conducted at the Suapur Union of Dhamrai Upazila, Dhaka, is located at 23088´N latitude and 90014´E longitude and AEZ-12, Bangladesh. The purpose of the experiment was to study the combine effect of nitrogen application methods and weed management for maximizing yield and yield components of boro rice (cv.BRRI dhan29).The experiment consisted of four nitrogen management methods and four weed managements. The experiment comprised two factors; Factor A: Nitrogen management (4 levels), N0: No urea (control), N1: Urea super granules-USG (77 kg N ha-1), N2: Prilled urea at recommended dose (150 kg N ha-1) and N3: ½ of the recommended dose (75 kg N   ha-1); Factor B: Weed management (4 levels), W0: No weeding (control), W1: Two hand weeding (20 and 40 DAT), W2: Pre emergence herbicide (Butachor) and W3: Post emergence herbicide (Prityloclor). The experiment was laid out in a randomized complete block design with three replications. Data on different yield components and yield of BRRI dhan29 were recorded. Statistically significant variation was observed for their combined effect. The highest grain yield (6.80 t ha-1) was obtained from the interaction between urea super granules-USG (77 kg N ha-1) and pre emergence herbicide (Butachor), whereas whereas the lowest (3.85 t ha-1) from the interaction between no urea (control) and no weeding (control). From the results of the study it can be concluded that the application of urea super granules-USG (77 kg N ha-1) and pre emergence herbicide (Butachor) condition might be used for obtaining the best performance of BRRI dhan29.