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为了探索棉花高产规律,我们从1976年起连续三年采用岱红岱中系统选育品种耒棉5号和双铃1号(有限果枝类型)两个品种,进行大面积棉花高产栽培试验。每亩密度分别为3000、4000、5000株,试验面积1.5—2亩。三种密度实产160—250斤,其中以耒棉5号每亩4000—5000株的产量最高,亩产256.1斤。1978年又以上述三种密度,同时采用耒棉5号、双铃1号,耒77—1、无47、无49号(“无”为无棉毒素棉)5个品种进行重复试验,试验面积均在1亩以上。试验结果以耒棉5号每亩4580株的产量最高,亩产218.8斤。在几年的试验中,对高产棉花的生育动态、株型结构、结铃状况和各生育期的长势长相,以及相应的促控技术等进行了系统的观测研究,现总结分析如下:
In order to explore the law of high yield of cotton, we cultivated two varieties of Daihong Dai Zhongshuang Cultivars Nianyan 5 and Shuangling 1 (limited fruit branch type) for three years in succession from 1976 for large-area high-yielding cotton cultivation experiment. Densities per mu were 3000,4000,5000, the test area of 1.5-2 acres. Three kinds of density of 160-250 pounds of production, of which the cotton on the 5th cotton 4000-5000 per acre yield the highest yield of 256.1 kg. In 1978, with the above three densities, five varieties of cotton variety No.5, Shuangling No.1, No.77-1, No.47 and No.49 (“No” cotton-free toxin cotton) were tested repeatedly Area of more than 1 acre. The test results to Kui cotton 5 4580 per acre yield the highest yield 218.8 kg. In several years of experiments, we have systematically observed and studied the fertility growth, plant type structure, the state of knotted bell, the growth of each growing period, and the corresponding control techniques of high-yielding cotton. The results are summarized as follows: