| Pak. J. Bot., 39(1): 173-182, 2007. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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EFFECT OF DIFFERENT WEED CONTROL PRACTICES AND FERTILIZER LEVELS
ON THE WEEDS AND GRAIN YIELD OF WHEAT 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. Department of Agronomy, University of Agriculture, Faisalabad, Pakistan. |
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