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Growth and yield response of upland rice to nitrogen levels and weed control methods

Research Paper | December 1, 2017

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J. A. Adigun, E. Kolo, O. R. Adeyemi, O. S. Daramola, A. A. Badmus, O. A. Osipitan

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Int. J. Agron. Agri. Res.11( 6), 92-101, December 2017


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Field trials were conducted to evaluate the effect of nitrogen levels and weed control methods on growth and yield of rice at the Federal University of Agriculture, Abeokuta (07o15’N, 03o25’E) in the forest-savannah transition zone of South west Nigeria during the rainy seasons of 2014 and 2015. Three nitrogen levels (0, 60 and 90)kg ha-1 constituted the main plot treatments. The sub-plot treatments were seven weed control methods: Propanil +2, 4-D (Orizoplus) at 2.0kg a.i. ha-1; Orizoplus at 2.0kg a.i. ha-1 followed by supplementary hoe-weeding (fb SHW) at 6 weeks after sowing (WAS); Butachlor (Buster) at 1.0kg a.i. ha-1; Buster at 1.0kg a.i. ha-1 fb SHW at 6 WAS; two hoe-weedings at 3 and 6 WAS; three hoe-weedings at 3, 6 and 9 WAS (season-long weed control); and weedy check. Nitrogen level had no significant effect on weed growth. Rice growth and grain yield increased with increase in nitrogen level from 0 to 90kg ha-1. All weed control methods significantly reduced weeds with subsequent improved rice growth and yield compared with weedy-check. Pre-emergence application of Orizoplus at 2.0 or Buster at 1.0kg a.i. ha-1 fb SHW at 6 WAS provided weed control, and rice growth and yield similar to season-long weed control. Practical applications of this study are that increased nitrogen level and early weed control with a pre-emergence herbicide followed by supplementary weed removal at 6 WAS could help to improve growth and yield of upland rice.


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Growth and yield response of upland rice to nitrogen levels and weed control methods

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