Affiliation:
1. South China Agricultural University, China; Ministry of Agriculture, China
2. University of Agriculture, Pakistan
3. Huazhong Agricultural University, China
Abstract
ABSTRACT Adjustment of planting geometry along with reduced applications of herbicides can be a viable tool for effective weed management in rice. This present study has examined the effects of three planting geometries (20 cm x 20 cm, 20 cm x 10 cm and 10 cm x 10 cm); along with early post emergence herbicides, viz; bispyribac sodium 20% WP at 39.50 g a.i. ha-1, bispyribac sodium 100 SC at 39.50 g a.i. ha-1, cyhalofop-butyle 10% EC at 49.50 g a.i. ha-1, and penoxulam 240 EC at 15 g a.i. ha-1 on weed growth, and rice performance under semi-arid climate. A weedy check was maintained as control where no herbicide was applied. Results showed that the narrowest plant spacing (10 cm x 10 cm) effectively controlled weeds; however, it also resulted in reduced rice growth and yield. More weed infestation and a season-long weed growth in weedy check plots have damaged rice growth and yield performance. All herbicides were effective in reducing weed density and biomass; however, reductions were greatest for 10 cm x 10 cm spaced plants. Among different plant spacings, the highest grain yield (4.35 ton ha-1) was obtained from plots where rice was planted at 20 cm x 20 cm; while narrowest plant spacing led to reduced tiller production, panicle development, grains per panicle, 1000-grain weight, and grain yield, but increased sterility % and biological yield. Further, weed dry biomass was negatively correlated with grain and biological yield of rice at all spacings. Although narrow plant spacing was effective in controlling weeds, it also reduced rice productivity, suggesting the need for further studies to overcome intra-specific competition in narrow spaced rice plants through improved resource management.
Subject
Plant Science,Agronomy and Crop Science,Physiology,Biochemistry
Reference27 articles.
1. Response of hybrid rice to various transplanting dates and nitrogen application rates;Abid M.;Philipp Agric Sci.,2015
2. Effect of integrated weed management and spacing on the weed flora and on the growth of transplanted aman rice;Ali M;Int J Sustain Crop Prod,2008
3. Effect of sowing dates and weed control methods on weed infestation, growth and yield of direct-seeded rice;Anjum S.A;Philipp Agric Scientist,2014
4. Planting geometry induced alteration in weed infestation, growth and yield of puddled rice;Ashraf U;Pak J Weed Sci. Res,2014
5. Agronomic indices, growth, yield-contributing traits, and yield of dry-seeded rice under varying herbicides;Awan T.H;Field Crops Res,2015
Cited by
3 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献