Nitrogen management on weed growth and yield of aus rice cultivars

Abstract

In this regard, to evaluate the effect of nitrogen management on weed growth and yield of aus rice
cultivars an experiment was conducted at the Agronomy Field Laboratory of Bangladesh Agricultural
University, Mymensingh during the period May to August 2019. Three rice cultivars, namely
Binadhan-19, BRRI dhan48, and Mulagburu, were used in the experiment, each with five nitrogen
levels such as no nitrogen (control), 50% of recommended dose (RD) of nitrogen (30 kg ha-1), 100%
of RD of nitrogen (60 kg ha-1), 150% of RD of nitrogen (90 kg ha-1) and application of urea super granule. A randomized complete block design (RCBD) with three replications was used to set up the experiment. BRRI dhan48, had the most weed development, whereas a minimum amount of weed infestation was seen in Binadhan-19. With rising nitrogen levels, weed infestation grew more severe, reaching its peak after USG treatment. Mulagburu and BRRI dhan48 demonstrated the highest weed density and dry weight, respectively, when USG was applied to these varieties. Binadhan-19, on the other hand, displayed the least amount of weed density and dry weight after receiving the control treatment. Both the cultivars and nitrogen management practices had significant impact on all the yield contributing characters and yield of aus rice. Mulagburu, scored better in terms of yield and yield-contributing traits. The best results for almost all parameters especially for grain yield were shown when 150% of the recommended dose of nitrogen (90 kg ha-1) was applied and significant variations were seen for almost all attributes. In the interaction scenario, with the application of 150% of RD of nitrogen (90 kg ha-1), the Mulagburu variety produced the maximum grain yield. Considering all of the facts, it might be adviseable to cultivate the Mulagburu variety in the aus season with 150% of RD nitrogen (90 kg ha-1) to obtain higher grain yield.