TECHNOLOGICAL ELEMENTS IN COTTON YIELD EARLINESS, YIELDING POTENTIAL ACHIEVEMENT AND REACTION TO HYDRIC STRESS OF COTTON GERMPLASM UNDER ECOLOGICALLY LIMITATIVE CONDITIONS FROM ROMANIA
Agricultural Research and Development Station, Teleorman, Romania
Резюме
Under poor thermic regime, the cotton earliness optimization is a vital aim. Beside genetically conditioned cultivar earliness, technological measures, such as: sowing time, plant density, crop protection with photodegradable sheet, treatments of ripening stimulation, rapid harvesting from field, could contribute to the cotton yield earliness. The sowing in optimum time and a plant density of 160-220000 pl /ha, lead to the obtainment of some statistically ensured yield gains in comparison with the late sowing and lower plant density. The outrunning of sowing time by cotton crop protection with photodegradable sheet constitutes a guarantee of increasing of plant productivity and its earliness, yield gains being statistically very significant (64-246%) in comparison with unprotected control. The mechanization contributes to the rapid yield harvesting, its quality being superior, the registered losses being of 18.6–20.3 % at “0-1” type cultivars. The cotton germplasm reaction to hydric stress was positive, the early yield level being of 84-90% from the raw cotton total yield.
Keywords: cotton, earliness, yield, mechanical harvesting, plant density, sowing time
