Effect of nitrogen fertilizer and weed management on the yield of transplant aman rice

Abstract

The research work was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during aman season from July to December, 2015 to study the effect of nitrogen fertilizer and weed management on the growth and yield of transplant aman rice cv. BRRI dhan46. The experiment consisted of four fertilizer treatments viz. 0 kg N ha −1 (N 0 ), 40 kg N ha −1 (N 1 ), 80 kg N ha −1 (N 2 ) and 120 kg N ha −1 (N 3 ) and four weeding treatments viz. one hand weeding at 20 DAT (W 1 ), two hand weedings at 20 and 35 DAT (W 2 ), three hand weedings at 20, 35 and 50 DAT (W 3 ), weeding by Japanese rice weeder twice at 20 and 35 DAT (W 4 ) and unweeded control (W 5 ). The experiment was laid out in randomized complete block design with three replications. The highest plant height (113.00 cm), number of total tillers hill −1 (8.74), number of effective tillers hill −1 (6.18), panicle length (21.98 cm), number of grains panicle −1 (114.20), grain yield (4.00 t ha −1 ), straw yield (5.25 t ha −1 ) and biological yield (9.25 t ha −1 ) were recorded in N 2 (80 kg N ha −1 ) treatment. The lowest plant height (106.00 cm), number of total tillers hill -1 (7.20), number of effective tillers hill −1 (5.00), panicle length (20.70 cm), number of grains panicle -1 (97.60), grain yield (3.52 t ha −1 ), straw yield (4.46 t ha −1 ) and biological yield (7.97 t ha −1 ) were recorded from N 0 (No nitrogen fertilizer control) treatment. On the other hand, the highest grain yield 4.23 t ha −1 was observed in three weedings condition because of the highest number of effective tillers hill −1 (6.81), number of grains panicle −1 (111.10). The highest straw yield (5.51 t ha −1 ) was also found in three weeding condition. The lowest grain yield (3.40 t ha −1 ) was recorded in W 5 (unweeded control) treatment. The lowest straw yield (4.31 t ha −1 ) was also observed in W 5 (unweeded control) treatment because of the smallest plant (106.97 cm) and lower number of total tillers hill −1 (7.20). Therefore, 80 kg N ha −1 along with three hand weedings at 20, 35 and 50 DAT may be used for obtaining the highest grain and straw yields of BRRI dhan46.

Influence of Weeding Regime and Integrated Nutrient Management on the Yield Performance of Transplant Aman Rice (Cv. Brri Dhan49)

“…Interaction effect of nitrogen fertilizer and weed management did not show significant effect on 1000-grain weight (Adhikari et al, 2018). Weight of 1000 grain was not significantly influenced by the interaction of weeding regime and integrated nutrient management in the present study.…”

“…But in the present study it is observed that plant height was not significantly influenced by the interaction between weeding regime and integrated nutrient management. Interaction effect of nitrogen fertilizer and weed management did not illustrate significant effect on final plant height (Adhikari et al, 2018).…”

“…Kant and Kumar found that number of grains panicle -1 increased with combined application of FYM and inorganic fertilizers namely urea and TSP (Kant and Kumar, 1994). Interaction effect of nitrogen fertilizer and weed management did not show significant effect on number of grains panicle −1 (Adhikari et al, 2018).…”

“…Among the different fertilizer treatments, 50% RDCF + 4-ton poultry manure/ha significantly enhanced the number of effective tillers/hill, plant height, panicle length, number of filled grain/panicle, straw yield and grain yield over control (Islam et al, 2013). Interaction effect of nitrogen fertilizer and weed management did not show significant consequence on panicle length, (Adhikari et al, 2018).…”

Effect of Different Doses of Urea on the Yield of Boro Rice Varieties in Haor Areas of Bangladesh

“…Nitrogen nutrient acts as a major part of protoplasm, protein and chlorophyll. It also plays a remarkable role in increasing cell size which in turn increases yield [4]. For better grain development it is required to use adequate amount of nitrogen at early, at mid-tillering and at panicle initiation stage [5].…”