THE EFFECT OF ANNUAL TEMPERATURE CHANGES ON SOME IMPORTANT QUALITY TRAITS OF SOYBEAN (GLYCINE MAX L.) GENOTYPES

Abstract

The study was conducted to investigate the changes in yield, fat and protein ratios and micronutrient concentrations of 9 soybean (Glycine max L.) lines and 2 standard varieties in semi-arid climatic conditions during soybean production seasons in 2012 and 2013. The experiments were established in a randomized block design with three replicates and were started on 08 May and 06 May in 2012 and 2013, respectively. The plot length was 6 m and each plot had 4 rows. The interrow spacing was 70 cm and intra row spacing was 5 cm. Yield, fat and protein ratios and micronutrient concentrations in seeds of soybean varieties/lines were different in two growing seasons. Average temperature during the first growing season was higher than in the second season. The difference in temperature significantly affected the yield, fat and protein ratios and micronutrient concentrations in seeds. The Ca, Cu, Fe, K, Mg, Na P and Zn concentrations of soybean seeds in the first year were higher than those obtained in the second year. The differences in nutrient concentrations between years indicated the effects of temperature differences on mineral compositions of seeds in addition to the yield, fat and protein ratios.