پتانسیل و تغییرات جهانی عملکرد کلزای خوراکی (Brassica napus L.)

In some countries, canola yield has not been increased from 1980 until now. This may be related to 1: obtained yield potential for their environment, 2: no germplasm improvement and 3: changes in growth environment and agronomic methods. For increasing yield more than 6 t.ha-1, about 130 thousand grain.m-1 must been produced, with 45 days grain filling period and with RUE about 0.75 grain. MGJ. In this conditions, translocation of photo-assimilate from stem to must contributed about 0.1 in grain yield. All of these traits have been obtained now solely in crops, and now, efforts was focused on integration them in the one cultivar. Today, there is trending to decreased tillage and N fertilizers. In addition, pesticides application is lesser than cultivar test trials. Therefore, this cannot controlled completely diseases. It seems that the combination of these management factors caused to not increase in some countries.