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The optimal cotton field density


, : The optimal cotton field density. Rasteniev"dni Nauki 18(7): 77-85

During the 1978-1980 period, various densities, i.e., 100,000, 130,000, 160,000, 190,000, 220,000, 250,000, 280,000, 300,000 and 330,000 plants/ha, were tested in field and production trials. The trials were carried out without irrigation, at 80-cm interrow spacing, with application of mineral fertilizers N100P80 and with cv. no. 433. Along with the reduction in nutrient area per plant, plant height and bush width, number of sympodia and monopodia, number of bolls per plant and mean boll weight decreased. Number of infertile plants, number of bolls harvested per unit area and height of 1st sympodium formation increased. Along with raising the plant density up to 190,000 plants/ha, cotton earliness expressed by the Sept. picking increased by 12.9%. Further increase in plant density up to 330,000 plants/ha also raised the quantity of the Sept. picking by 6.6-7.8%. The greater number of plants up to 160,000-190,000 raised total yield by 5.3%, while above that density, up to 280,000, it did not lead to higher yield than that produced by 100,000-130,000 plants/ha. The all-around evaluation of cotton earliness, yield and quality, as well as the extent of harvest mechanization, indicated that the optimal number of plants per ha is 160,000-190,000.

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