Abstract
Wheat was sown in small plats (17' x 1001 ) in rows. The weed reeds sown along with the crop were allowed to compete with the-crop for different durations. The grain and Straw yields cleoreased Eigniffeattly when the werdz compttEcl wish the crop for full Reason or after the crop wee 2-4 weeks old. Tile yield of wheat wag not influenced significantly when the crop was kept weed free for 6 weeks after planting or when the crop wag 6 to 10 wens
INTRODLIC rioN
The performance of crop is the result of interaction of their genetic constitution and the environment. Unfortunately, the crop huge-bandry technology is beset with many intricate problems. Besides hazards of inaeo• pests, plant diseases. goods, etc., the crops hive to compete with weeds for water, miners.1 nutrients, light, apiece anti other growth requirements. Thus, they suffer substantial irreparable loss.
The infivetioe of weed competition on the crop productivity depends upon *number of factors including the type end density of weode, period of weed competition and type of crop grOWM. Little work. has been reported on quanti-tative survey end wieed.crop competition in tndo-Pak sub-continent- However, qualitative ertrirey or flgra, voreio, weed centre], herbicide evaluation, etc„ were carried out by Kashyap 00364 Lutnra (1033), Ichan (Ii+64), Chatha (1973), Nadir (973) and Angari (1076),
M. Sadiq , Abid Nisar. (1984) Effect of weed competition on wheat (Triticum aestivum L.), Pakistan Journal of Agricultural Sciences, Volume 21, Issue 3,4.
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