Effects of Various Phosphorus Fertilizer on the Yield and Yield Parameters of Some Summer Rape (Brassica Napus Ssp Oleifera L.) Cultivars

Abstract

This research was conducted to determine the effects of different phosphorus doses on yield and yield components of three rapeseed varieties (Westar, Marinca ve Liravell) in 2004 and 2005 years under Van ecological conditions. Field trials were arranged in a completely randomized design with three replicates at experimental fields of Agricultural Faculty of Yuzuncu Yil University. According to the results of this research, significant differences were found among rapeseed varieties and phosphorus doses with respect to plant height, pod number per plant, seed yield, protein ratio, oil ratio, and oil yield. Generally, yield and yield components increased according to increasing phosphorus doses. However, there was no significant differences between 60 kg/ha and 90 kg/ha phosphorus doses in point of seed and oil yield. According to the mean values of two years, the highest pod number per plant (81.9) and oil ratio (%39.5) were obtained from 60 kg P/ha application, the highest seed yield (1458 kg/ha) and oil yield (570 kg/ha) were obtained from 90 kg P/ha application. In addition, this study revealed that the highest seed (1419 kg/ha) and oil yield (548 kg/ha) was obtained from Marinca rapeseed varieties.