فهرست مطالب منصوره توجه

In order to evaluate the effects of different levels of phosphorus (P) and boron (B) on yield, yield components, seed quality (protein and oil content) and P and B content of rapeseed (Brassica napus L.), a greenhouse experiment (aimed at removal of other environmental factors affecting growth parameters, which are not manageable in the field) was conducted. Treatments consisted of two cultivars of rapeseed (Talaye and Zarfam), three levels of P (0, 25 and 50 mg/kg) and three levels of B (0, 2 and 4 mg/kg) with three replications. Results revealed that significant differences were observed between the rapeseed cultivars in seed yield, plant height, number of siliques per plant, 1000-seed weight, and seed nitrogen (N), P and B content and oil concentration. Increasing the P level significantly increased dry weight of seeds, straw and roots yield, biological yield, plant height, number of siliques per plant, 1000-seed weight, protein yield, seed oil yield and seed oil content (p≤0.05). However, N concentration of seeds decreased by P application. Soil-applied B significantly increased B concentration and total uptake, and seed oil concentration in both rapeseed cultivars. There was a positive and significant correlation between seed yield and protein yield, number of siliques per plant and 1000-seed weight. Application of P and B fertilizers increased concentration and total uptake of P and B in the seeds of both rapeseed cultivars. There was synergistic interaction between P and B on most of the studied traits; but its significance was different in the two cultivars. It is advised to do the same research in the field with more P and B treatments and diverse rapeseed cultivars.

A greenhouse experiment was conducted in order to evaluate the influence of different nitrogen (N) and zinc (Zn) levels on yield، yield components، seed quality and N and Zn contents of two cultivars of rapeseed (Brassica napus L.). In this study، two cultivars of rapeseed (Talayeh and Opera)، three N levels (100، 200 and 300 mg/kg) and three Zn levels (0، 5 and 10 mg/kg) with three replications were used. The results showed that significant differences were observed between the cultivars in the studied traits. Increasing N and Zn significantly increased plant height، number of siliques per plant، number of seeds per silique، 1000-seed weights، seed yield، oil، straw and root yields and protein content. Oil seed content was the highest in application of 100 mg/kg N rate and then decreased or increased at higher N and Zn rates، respectively. The highest grain yield، oil yield and protein percentage were obtained with 300 mg/kg N and 10 mg/kg Zn. Increase in seed yield was related to increase in the number of siliques per plant and number of seeds per silique. Application of treatments increased concentration of N and Zn in the seeds، straw، and roots of both rapeseed cultivars. The interaction of N and Zn showed significant effects on most studied traits of rapeseed.