Vol. 1 No. 2
Effect of weed management on wheat (Triticum aestivum L.) under different tillage systems after kharif rice.
Author(s): A.C. PRADHAN, MAYADHAR NA YAK AND P.K. SARKAR
Abstract: To study the effi~cy of weed management (Metribuzin 175 g lu11 and isoguard plus 1250 g ha\"1 as post-emergence at 4 weeks of so~g. one hoeing at 4 weeks of sowing along with weed free and weedy checks) on wheat under different tillage systems (zero, minimum and conventional) a field experiment was carried out at District Seed Farm of Bidhan Chandra l(rishi Viswavidyalaya, Kalyani, Nadia, West Begnal during winter seasons of 2001-2002 and 2002 - 2003 in split plot design with three tillage systems in main-plots and five weed control measures in sub-plots. The treatments were replicated thrice. The pooled analysis of the experiment revealed that growth parameters like plant height, tiller density and dry matter production at harvest, leaf area indices upto 11 weeks of sowing, crop growth rates from 7 to 9, 9 to 11 and 11 to 13 weeks after sowing improved significantly among three tillage systems and between ti weed control treatments. Yield components viz. number of spikes per square metre, number of grains per spike and test weight of grains increased significantly within tillage systems and between weed control measures. Grain yield of wheat differed significantly among the tillage systems. 41.2 and 53 .2 per cent increase in grain yields were obtained from minimum and conventional tillage respectively over zero tillage. Significant increase in grain yields were observed from all weed control measures over weedy check. 56.9, 48.1, 37.4 and 22.4 per cent increase in grain were recorded from weed free check, isoguard plus, metribuzin and one hoeing. in sequence over weedy check. Significant difference in weed density and dry weight of weeds were observed between tillage systems at early stages of crop growth. However, the lowest values were recorded from conventional tillage followed by minimum tillage. Among three categorised weeds (grasses, sedges and broad leaves), appearance of broad leaves under zero tillage was quite low. Density and dry weight of weeds were significantly reduced due to all weed control measures. However, metribuzin 175 g ha\"1 was proved to be the best herbicidal treatment closely followed by isoguard plus 1250 g ha\"1 for controlling all categorised weeds. Among these two treatments, isoguard plus was much more profitable in terms of net return and benefit-cost ratio under three tillage sysU:ms.
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