Paper Details

PJB-2024-509

Optimizing nitrogen and weed management for transplanted rice: a yield and weed growth assessment

 

 

Kazi Ashika Mahmuda Onna, Md. Liton Mia, Md. Tutul Hossen, Md. Shafiqul Islam, Farhana Zaman, Ahmed Khairul Hasan, Mahfuza Begum and Md. Abdus Salam
Abstract

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The most significant limiting nutrient in the production of rice is nitrogen, which has a beneficial impact on rice grain production. 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). Beginning from June to October 2022, the experiment was executed at Agronomy Field Laboratory of Bangladesh Agricultural University (BAU), Mymensingh, Bangladesh. 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 (Superhit 500 EC (Pretilachlor) herbicide at 1 L ha^-1) as pre-emergence, at 35 DAT a one hand weeding herbicide of early post-emergence (Sarinda 18 WP (Acetachlor 14 WP + Bensulfuron methyl 14 WP) @ 500 g ha^-1), herbicide of both pre-emergence and early post-emergence. In the experimental fields, 14 species of weeds from 6 families were identified. With the help of USG and pre- and post-emergence herbicides, it was feasible to reduce the density and dry biomass of weeds reasonably. 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. Pre-emergence and early post-emergence herbicide applications were included in USG, and the results were nearly identical (t ha^-1) 5.87 and 6.33. The study's findings may lead to the conclusion that USG combined with pre-emergence along with early post-emergence herbicides can be recommended for controlling weeds. On the other hand, it can be suggested that 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

To Cite this article: Onna, K.A.M., M.L. Mia, M.T. Hossen, M.S. Islam, F. Zaman, A.K. Hasan, M. Begum and MA. Salam - Optimizing nitrogen and weed management for transplanted rice: a yield and weed growth assessment. Pak. J. Bot., 58(6): DOI: http://dx.doi.org/10.30848/PJB2026-6(12)  
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