Effect of Boron and Zinc Levels on Yield and Yield Components of Two Winter Rapeseed Cultivars in Qazvin Region

Boron and zinc are two essential nutrients that are essential for the quantity and quality of agricultural products.This search is conducted in order to study the effect of boron and zinc elements on yield and yield components of two canola cultivars, as a factorial experiment based on randomized complete block design. Two canola varieties (Regent * Cobra and SLMO46), three levels of boron: 0, 15 and 30 kg boric acid ha-1 B0, B15, B30) and three zinc levels: Zero, 25 and 50 kg zinc sulfate ha-1 (Zn0, Zn25, Zn50) were carried out at Ismail Abad station in Qazvin. The studied traits included plant height, number of pods per plant, number of seeds per pod, 1000 seed weight, oil percentage, oil yield and grain yield. The results showed that in Regent *Cobra, the highest grain and oil yield was obtained with B15 (15 kg boric acid per hectare) at 4027 kg ha-1 . By applying of 30 kg ha-1 boric acid, number of pods per plant and plant height were increased by 9.5 and 1.2%, respectively. Oil yield increased with B15 and B30 treatments, 108 and 147 kg ha-1 , respectively. With 25 and 50 kg ha-1 zinc sulphate, Plant height increased was 6.97 and 6.30%, and the percentage of oil was 6.97 and 8.41% respectively, respectively. In Regent*Cobra cultivar, the highest grain yield was obtained with the application of B15 at 4027 kg ha-1 . In SLM046 cultivar, the highest grain yield was obtained using B15 at 4645 kg ha-1 .In this cultivar, the oil yield with B30 reached 2170 kg ha1 .Therefore, application of micronutrient fertilizers containing boron and zinc can be affected by increasing grain and oil yield in compare with control.