مدیریت تلفیقی علف های هرز کلزا با استفاده از مدیریت کود و تراکم

In order to evaluate the effect of different levels of nitrogen fertilizer and plant density on competetiveness of rapeseed with weed, an expriment was carried out in ۲۰۰۸ at Marvdasht, Naghshe Rostam in Fars. The expriment was conducted in factorial arrangement on the base of RCBD with ۳ replications. The treatments were a combination of ۴ planting densities (۵۰, ۸۰, ۱۱۰ and ۱۴۰ plant/m۲) and the amount of applied nitrogen fertilizer as the suggested rate, (۳۳۰ kg/ha), ۳۰% more than the suggested rate (۴۳۰ kg/ha), and ۳۰% less than the suggested rate (۲۳۰ kg/ha). The results showed that the grain yield, pod number per plant, the thousand seed weight, total number of weeds and weeds dry weight were affected with density but just weeds dry weight was affected by nitrogen fertilizer. Results showed that the highest grain yield was obtained in density of ۱۱۰ plant/m۲ and the use of ۳۳۰ kg/ha of nitrogen fertilizer, the highest pod number per plant was in density of ۵۰ plant/m۲ and the use of ۴۳۰ kg/ha of nitrogen fertilizer, the highest thousand seed weight was in density of ۱۱۰ plant/m۲, the highest number of weeds was in density of ۵۰ plant/m۲ and the highest weeds dry weight obtained was in density of ۵۰ plant/m۲.