SOME PHYSIOLOGICAL PARAMETERS AND YIELD CHANGES OF FINE-FIBER G. BARBADENSE L. COTTON VARIETIES UNDER STRESS CONDITIONS

The article presents some data obtained on the study of photosynthesis and respiration rates of fine-fibre cotton varieties in conditions of soils with varying degrees of salinity. During the experiments, the photosynthesis and respiration rates of fine-fibre cotton varieties Surkhon-18, Termiz-202, Termiz-208, SP-1607 and Surkhon-16 were investigated in relation to the level of salinity in the soil. It was found that there is a relationship between the level of salt tolerance of photosynthesis and respiration rates among the studied varieties, and its change varies to varying degrees depending on the stages of growth and development and biological characteristics of the varieties.