PJB-2024-509
OPTIMIZING NITROGEN AND WEED MANAGEMENT FOR TRANSPLANTED RICE: A YIELD AND WEED GROWTH ASSESSMENT
KAZI ASHIKA MAHMUDA ONNA
Abstract
The most significant limiting nutrient in the production of rice is nitrogen, which has a beneficial impact on rice grain production. Again, a high level of N supply may favor weeds over crop plants. This investigation examined the effect of integrated nitrogen management and weeding practices on weed growth and yield of T. aman rice (cv. BRRI dhan71). The experiment consisted of five nitrogen levels viz., control (no N), 100% N from prilled urea, 100% N from poultry manure (PM), 50% N from prilled urea + 50% N from PM and application of USG and five weeding practices viz., un-weeded control, weed-free condition, at 35 DAT a single hand weeding including herbicide of pre-emergence, at 35 DAT a one hand weeding herbicide of early post-emergence, herbicide of both pre-emergence and early post-emergence. In the experimental fields, 14 species of weed from 6 families were identified, based on the study's results. With the help of USG and pre- and post-emergence herbicides, it was feasible to reduce the density and dry weight of weeds reasonably priced. Numerically, the maximum yield (grain, straw (t ha-1) (6.09, 6.50) was produced by using pre-emergence herbicide together with 50% N from urea + 50% N from PM. USG including pre-emergence herbicide and early post-emergence herbicide application recorded almost same result by (t ha-1) 5.87 and 6.33. The study's findings may lead one to the conclusion that USG combined with pre-emergence along with early post-emergence herbicides can be recommended for controlling weeds effectively. On the other hand, it can be suggested that the maximum production of the grain yield of T. aman rice can be achieved by applying pre-emergence herbicide afterward using early post-emergence herbicide combining 50% N from urea and 50% N from PM.
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