Abstract

Author:
Md. Liton Mia, Md. Abdus Salam

Doi: 10.26480/trab.02.2024.55.61

This is an open access article distributed under the Creative Commons Attribution License CC BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited

The key component is nitrogen, which is also essential for the production of rice. From November 2021 to May 2022, an experiment was carried out at the Bangladesh Agricultural University (BAU), Mymensingh, at the Agronomy Field Laboratory, to investigate the impact of nitrogenous fertilizer on weed development and boro rice yield. Five different levels of nitrogenous fertilizers were used in the experiment: no nitrogen (control) (N0), 100% of RD of N from urea (N1), 100% of RD of N from poultry manure (N2), 50% of RD of N from urea + 50% of RD of N from poultry manure (N3), and 100% of RD of N from USG (2.7 g per 4 hills) (N4). The five boro rice cultivars included in the experiment were BRRI dhan28 (V1), BRRI dhan29 (V2), BRRI dhan71 (V3), BRRI dhan100 (V4), and BRRI Hybrid dhan5 (V5). Three replications and a randomized complete block design were used to establish up the experiment. According to the experimental data, BRRI dhan29 had a maximum weed density and dry weight at both the sample days and was heavily infested with weeds. BRRI Hybrid dhan5 and BRRI dhan71 had the lowest dry weight and weed density, respectively. Weeds were recorded using the quadrate method. The maximum dry weight (4.47 g m-2) and weed density (31.80 m-2) were found in BRRI dhan29 at 20 DAT. The maximum dry weight (4.06 g m-2) and weed density (27.40 m-2) were similarly found in BRRI dhan29 at 40 DAT. However, at 20 DAT and 40 DAT (33.60 m-2 and 4.06 g m-2, respectively), the weed density (38.40 m-2) and dry weight (4.50 g m-2) were highest in N1 (100% of RD of N from urea). The maximum weed density (41.67 m-2 and 36.33 m-2) at 20 DAT and 40 DAT, respectively, in the treatment of V4N1 (BRRI dhan100 with 100% of RD of N from urea applied) was produced by the interaction of cultivar and nitrogen. At 20 and 40 days after treatment, the maximum dry weight of weed (5.22 g m–2 and 4.5 g m–2) was seen in the V1N1 treatment (BRRI dhan28 with 100% of RD of N from urea). According to the findings of the study, BRRI Hybrid dhan5 with application of UGS may be suggested in managing weed more successfully during boro season.