The Effects of Different Sowing Time and Seeding Rates on Weeds in Wheat

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This research carried out effects of different sowing times and seeding rates of wheat on weed density. The cultivar Kirik, the most common facultative variety of Erzurum in Turkey, was used. The treatments were sowing times (Winter, Freezing and Spring sowing) and seeding rates (325, 375, 425, 475, 525, 575 and 625 viable seeds m^-2). The effect of different seeding rate on weed density was not significant while the effect of sowing time was considerably significant in both years. The highest weed density was observed in spring sowing in both years (2002/2003 and 2003/2004), and followed by freezing and winter sowings respectively. Dry weight of weeds showed significant differences in seeding rates and sowing time. The highest dry weight of weed was determined in the lowest seeding rate which is 325 viable seeds per m^2 while the lowest dry weight of weed was determined in seeding rate of 625 viable seeds per m^2 during the vegetation period of 2002/2003. In the vegetation period of 2003/2004, the highest dry weight of weed was also determined in seeding rate of 475 viable seeds per m^2. On the other hand, the highest dry weight of weed was found in the lowest seeding rate while the lowest dry weight was found in the highest seeding rate based on the mean of two years. There were significant differences between dry weight of weeds according to the sowing time. The highest dry weight was found in spring sowing followed by freezing and winter sowings followed this treatment, respectively.

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Wheat , cultivar , weeds , sowing time , seeding rate

Erciyes University Journal Of The Institute Of Science an‎d Technology

368

Erciyes University Journal Of The Institute Of Science an‎d Technology