The effect of nitrogen levels and wild mustard densities on yield and economic threshold of canola
To evaluate the effect of different rates of nitrogen fertilizer on competitive ability of canola (Okapi cv.) in interference with wild mustard, a split-plot experiment based on a randomized complete block design with 3 replications was carried out at agricultural faculty of Bu-Ali Sina University, in 2008-2009. 4 levels of nitrogen fertilization (100, 150, 200 and 250 kg N ha-1) were assigned to mainplots and plant density of wild mustard at 5 levels (0, 4, 8, 16 and 32 plants m-2) to the sub-plots. The results showed that with increasing nitrogen application, were improved the canola vertical distribution of LAI and dry matter in pure condition and interference of wild mustard. Increasing wild mustard density led to decreased sum of canola and wild mustard yield in unit area. Nitrogen up to 150 kg ha-1, increased grain yield of wild mustard at all levels density. Increase up to 200 kgN ha-1, led to slight reduction of economic threshold of wild mustard on canola yield, but in 250 kg N ha-1, economic threshold value was less than a wild mustard plant in square meter. Overall the findings suggest that nitrogen application to 200 kgN ha-1 caused increases in competitive ability of canola against in wild mustard.
Electronic Journal of Crop Production, Volume:4 Issue:4, 2012
روش‌های دسترسی به متن این مطلب
اشتراک شخصی
در سایت عضو شوید و هزینه اشتراک یک‌ساله سایت به مبلغ 300,000ريال را پرداخت کنید. همزمان با برقراری دوره اشتراک بسته دانلود 100 مطلب نیز برای شما فعال خواهد شد!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی همه کاربران به متن مطالب خریداری نمایند!