Effect of Weeding and Foliar Urea Spray on the Yield and Yield Components of Boro Rice

摘要

Weed is the one of the most harmful enemy of rice that causes drastically yield reduction by competing with essential resources. On the other hand, nitrogen is the yield limiting nutrient element and foliar urea ensure higher yield of rice without loss of nutrient. Therefore, an experiment was conducted at Bangladesh Agricultural University, Bangladesh to investigate the effect of weeding and foliar application of urea on the yield and yield components of Boro rice cv. BRR1 dhan 29. The experiment included four weedings e.g. no weeding (W_0), one weeding (W_1), two weedings (W_2) and three weedings (W_3) and six methods of urea application viz. foliar spray @ 0, 60, 80,100 and 120 kg ha~(-1) and soil application @ 220 kg ha~(-1). The experiment waslaid out in a split plot design with three replications. Weeding treatments were allocated in main plots while methods of urea application were placed in sub-plots. Weeding had significant influence on yield and yield contributing characters of Boro ricecv. BRR1 dhan29. Three weedings produced the highest number of total tillers hill~(-1), effective tillers hill~(-1) and grains panicle~(-1), which eventually contributed to the highest grain yield inthis treatment. All the yield contributing characterswere the most inferior in case of no weeding and thus this treatment gave the lowest grain yield as well as straw yield. Yield and yield contributing characters of Boro rice cv. BRR1 dhan 29 were significantly influenced by foliar application of urea. The highest grain yield was obtained from five times foliar urea spray @ 100 kg ha~(-1). This highest grain yield was the resultant effect of highest number of effective tillers hill~(-1)and grains panicle~(-1) in this treatment. The interaction of weedingand foliar application of urea also influenced grain yield of Boro rice cv. BRR1 dhan29. The highest grain yield was obtained from the five times foliar spray of urea @ 100 kg ha~(-1) with three weedings regime.