Effect of Crop Establishment Methods, Nitrogen and Weed Management Practices on The Performance of Rice Variety

Abstract

Four experiments were conducted at BRRI Regional Station, Shyampur, Rajshahi to find out the most selective crop establishment method, best application option of N and suitable weed management practices in both T aman and Boro season. Popular T aman rice variety BRRI dhan44 and Boro rice variety BRR! dhan45 were used as planting materials, where three crop establishment methods (T1= direct wet seeding by drum seeder, T2= hand broadcasting and T3= transplanting) were common treatments for the whole study of N management (N 1= ½ at 15 DAT+ ½ at 30 DAT+½ at PI, N2= ¼ at basal + ¼ at 15 DAT + ¼ at 30 DAT + ¼ at PI, N3= LCC based N application and N4= no nitrogen) for the experiment one and three and weeding options (W 1=Hand weeding, W2=BRRI weeder + HW, W3=Herbicide + HW and W4= no weeding) for the experiment two and for four. The experiment was laid out in RCBD with three replications and means were adjudged by DMRT at 5% level of probability. Data were collected on morpho­physiological, yield and yield attributes where the most of the studied characters were statistically significant due for single effect or their interactions. In experiment one, effect of crop establishment method, the plant population had maximum (143 .16) in transplanting methods (T3) at 60 DAS and highest grain yield (5.05 t ha-1) at than other two crop establishment methods while T2 (hand broadcasting) obtained the highest BCR (2.34). Among the N management practices, N2 showed significantly the greater result on plant population (134.11) at 60 DAS and grain yield (4.97 t ha-1) the highest BCR (1.97). For interaction effect between crop establishment and N application methods, plant population had maximum (152.33) in interaction treatment of T3N2 at harvest. In experiment two, highest yield (5.12 t ha-1) was obtained in T3 with highest BCR (2.08) was found in hand broadcasting (T2). For weed management, superior results found for plant population (139.66) at 60 DAS, grain yield (4.97 t/ha) and BCR (1.47) in hand weeding treatment. On the other hand, the highest PDM (36.20 g) at 60 DAS and yield (6.10 t ha-1) were obtained in T3W1• Similarly, in experiment three plant population and PDM had maximum (57.29 and 4.43 g) in T3 at 60 DAS while T1 showed the highest BCR (1.47). Incase of N management, N2 showed the maximum PDM (4.93 g) at 60 DAS and the highest BCR (1.97). The maximum number of plant population (67. 16) at 60 DAS was taken in interaction of T3N2. For last experiment, transplanting method (T3) showed significantly the maximum population of plant (61.87) at 60 DAS and highest yield (3.54 t ha-1) however, T2 showed the highest BCR (1.35). Similarly, maximum plant population (66.44) at 60 DAS, highest straw oven dry weight (31.54 g) at harvest and the highest BCR (1.91) were obtained for hand weeding treatments (W1). So, the above observation of the whole study, it could be concluded that the transplanting method and N @ ¼ at basal + ¼ at 15 DAT+ ¼ at 30 DAT+ ¼ at PI singly (T3 and N2) or their interaction effect (T3N2) would be the most suitable for aman and boro. Considering weed management practices, the interaction of T3 W1 would be the best option for T-aman (Exp.2) where the interaction effect of TI W 1 ( direct wet seeding by drum seeder x hand weeding) were the most efficient interaction for obtaining the higher yield during Boro season.