XORIJIY G‘O‘ZA NAVIDA RETARDANT QO‘LLASH MUDDATI VA ME’YORLARI HAMDA SUG‘ORISH TARTIBINING KO‘CHAT QALINLIGIGA TA’SIRI

Abstract

In the cultivation of foreign cotton varieties, when the target plant density was maintained at 220–240 thousand plants per hectare, pre-irrigation soil moisture was kept at 70–75–65% of field capacity, and the growth regulator Entojan was applied six times at rates of 10:15:45:90:90:120 g/ha, plant survival was found to be higher by up to 6.1 thousand plants per hectare compared to three applications. In contrast, under a plant density of 150–160 thousand plants per hectare and a moisture regime of 65–70–60% of field capacity, with Entojan applied three times at 10:45:90:90:120 g/ha, plant survival was 1.3–4.7 thousand plants per hectare lower than under the 70–75–65% moisture regime. The results indicate that the irrigation regime and the timing and frequency of growth regulator application are key factors influencing the maintenance of optimal plant density.