Volume 1 Issue 2

Effect of chemical measures of weed control in zero-till wheat (Triticum aestivum L) at Gangetic alluvium of Eastern India

Author(s): S. SUDHA RANI AND A.C. PRADHAN
Abstract: A field experiment was carried out during winter seasons of 2002--03 and 2003--04at District Seed Fann of Bidhan Chandra Krishi Viswavidyalaya, Kalyani, Nadia, West Bengal to study the effect of chemical methods of weed control in zero-till wheat. The experiment was conducted in randomized block fourteen treatments and three replications. 1be ·esults of the experiment revealed that crop was severely infested with sedges and grasses as compared to broad leaf weeds. The pooled analysis showed SO percent reduction in grain yield due to weed-crop competition. All weed control methods effectively reduced weed density and markedly suppressed dcy weight of weeds. Growth parameters of wheat like tiller density, leaf area indices, crop growth rates and yield components viz. spike density, number of filled grains per spike and test weight of grain increased significantly by the application of chemicals over weedy check in comparism to others. Application of metribuzin 17S g ha.1 before first irrigation effectively controlled all categories of weeds in :zero-till wheat resulting in 78.2 percent increase in grain production which was comparable with weed free and two manual weedinjs. Amolli the chemical control measures metribuzin 175 g ba.1 before first irrigation was most econoffilcal by paying highest net retwn (Ra. 18,598/-) and benefit· cost ratio (2 : 1 ).

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