PJB-2007-22
EFFECT OF DIFFERENT WEED CONTROL PRACTICES AND FERTILIZER LEVELS ON THE WEEDS AND GRAIN YIELD OF WHEAT
MUHAMMAD ATHER NADEEM, ASGHAR ALI AND ASIF TANVEER
Abstract
A field experiment was conducted to assess the effect of different weed control practices and fertilizer levels on weeds and grain yield of wheat in winter 2002-03 and 2003-04. The experiment comprised of four weed control practices of viz., weedy check, pre-emergence application of pendimethalin, post-emergence application of isoproturon + carfentrazone ethyl and manual weed control (two hoeings) and three fertilizer levels viz., 0+ 0, 75 + 50 and 150 + 100 kg N + P2O5 ha-1. Manual hoeing resulted in minimum weed density and dry weight in both the years. The maximum grain yield (5816 and 5071 kg ha-1) was recorded in manual hoeing in 2002-03 and 2003-04 respectively mainly due to more number of fertile tillers, number of grains per spike and 100-grain weight. Weed density 40 days after sowing and weed dry weight increased significantly with each increased fertilizer level. The maximum grain yield was recorded with 150 + 100 kg N + P2O5 ha-1. Manual weed control and application of 150 + 100 kg N + P2O5 ha-1 was found to be the best combination for obtaining higher grain yield of wheat.
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