Abstract
Efficiency of seven post-emergence weedicides namely EN A.6 (2, 4-D amine) yrgr 1.7 liha, Buictril-M chromoxyrill MCPA) 1.4 liha, (dicarnba mecoprop) 6. 4,10 ]/ha Envoy (Cyariazine MCPA) 2.0 kg/ha, Dicuran MA (Chlortoluron MCPA) 2.5 kg/ha„ Arelon (isoproturcri) @ 1,5 kg/ha and Doranex. (metoxuron) (5) LC kg/ ,a was studied against hand weedig on a sandy loam soil. Cultural and chemical weed control prac-tices suppressed weed population. DMA 6 and Euctril-M were found to be ec4 nornical.
lNTRODUCTION
The introduction of high yielding wheat varieties having high fertilizer and irrigation requirernenis has resulted in ttercendous increase in weed popula. tion in wheat fields. The extent of losses caused by weeds it alarming. 011 an average, 15-70% yield reduction due to weeds has been estimated. On weight basis, this amounts to a loss of about 1.5-2.8 million. tone per year and in monetary derma Rs. 2,500 million per year (Ahmed et al., 1984). It has been reported further that the crop yield rosy be increased by about 37% by complete control of weeds (Ulla and Shah, 1984). Experimental studies have shown that weeds consuirne at least as much NPK fertiliser as the crop plant (Ghauri, 1933). Control of weeds is, therefore, essential for obtaining higher yield and better quality of the produce.-
Weed control by manual or mechanical means is in practice since long but with the introduction or labour-intensive cropping system, the traditional practice of controlling the weeds through mechanical practices (hand weeding, hoeing, mowing, burning, machine Wiz ge, oic,) has become expulsive. Chemi-cal weedicida have been shown to be beneficial and very effective means for conzrolling weeds in wheat.
