Ayçiçeğinde Yabancı Ot Kontrolünde Kritik Periyot ve Uygulamaların Yabancı Ot Türleri ve Çeşitliliğine Etkileri

This study was carried out under field conditions in Adana, Turkey 2018 and 2019 to determine the critical period for weed control sunflower depending on daily growth temperature (GDD) species. A log-logistic model with four parameters used relationship between relative crop yield both increased intervention time length of weed-free periods. In addition, dominant weeds densities were determined experimental area. Data obtained from different periods compared data seasonal plots. During growing season, 37.4% – 41.04% loss due competition. For 5% acceptable first year, as 243-1181 GDD; this is 24-86 days after emergence (DAE) . It found 269 1409 GDD (16-72 DAE) second year. sunflower, it that removal plot started within 2-3 weeks continued 10-12 weeks. These findings may help growers plan implement cost-effective appropriate programs.