Effects of Different Nitrogen Doses on Some Chemical Components of Soybean Cultivars

Abstract

This study was conducted at the Experimental Field of the Bahri Dağdaş International Agricultural Research Institute, in Center of Konya, Turkey, between the years 2003-2004 in order to determine the effects of various nitrogen doses on yield and chemical composition of soybean cultivars. Athow and Defiancy cultivars of soybean were used in this study.  0.0, 2.5, 5.0, 7.5 and 10.0 kg/da nitrogen doses were applied while sowing. The results from both years were evaluated together. According to the results of the research; application of various nitrogen doses on two soybean cultivars resulted in significant differences in seed yield and chemical composition. Oil content decreased with added nitrogen fertilizer. The greatest values of seed yield and chemical composition were generally obtained at a dose of 7.5 kg/da nitrogen. Higher nitrogen doses led to lower values of seed yield and chemical composition. Defiancy cultivar had generally higher seed yield values in all traits and lower starch contents than Athow.