Determination relation between some physiological parameters, yield and technological characteristics of cotton (Gossypium hirsutum L.) by path analysis method

This study was carried out to determine the direct and indirect effects between yield and agronomic, morphological and some physiological parameters by using correlation and path coefficient analysis method in 10 cotton cultivars widely cultivated in Southeastern Anatolia Region. The study was conducted in 2017 in Bismil district of Diyarbakır with 4 replications according to randomized block design. As a result of the study, statistically significant differences were obtained in all traits except plant height, number of monopodial branches, chlorophyll content (SPAD value) and moisture content. According to the correlation analysis, there was a significant positive correlation between cotton yield and fiber yield, fiber fineness and canopy temperature, but negative correlations were found between yield and spinning consistency index (SCI), fiber length, fiber strength and single boll seed cotton weight. According to the path coefficient analysis, the highest direct effect on the cotton yield was determined by fiber yield (87.26%) and the highest indirect effect was realized by ginning percentage (5.99%). Physiological parameters such as chlorophyll content (SPAD value) had a direct effect on the yield (6.52%), also it had positive indirect effect via fiber yield (27%) and ginnining percentage (24%). The direct effect of canopy temperature on yield was negligible (0,0928%), but it had significant positive indirect effect via fiber yield (75%) and ginnining percentage (14%). Normalized difference vegetation index (NDVI:GreenSeeker reading) had direct effect on yield (2.28%), but it had significant indirect effect via fiber yield (58%) and ginning percentage (27%).