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棉花后期早衰的原因很多,但主要是受土壤条件和施肥的影响。我县常年棉田面积40万亩,1971～1978年平均每年早衰面积16.34万亩,占总棉田面积的37.3％。进入80年代后,由于大力推广磷钾肥,早衰面积有所下降,但仍占总面积的10％左右,影响了棉花产量和品质的提高。为研究早衰的生理原因,以便及时指导生产,我们进行了一些试验,并采集了土样和植株样品进行分析,现将材料整理如下。
There are many reasons for early postburn cotton, but mainly affected by soil conditions and fertilization. The annual area of cotton fields in our county is 400,000 mu, with an average of 163,400 mu of premature decay areas per year from 1971 to 1978, accounting for 37.3% of the total cotton field area. Into the 80’s, due to the vigorous promotion of phosphorus and potassium, premature decline in area has declined, but still accounts for about 10% of the total area, affecting the cotton yield and quality improvement. To study the physiological causes of premature aging, in order to promptly guide the production, we conducted some experiments, and collected soil samples and plant samples for analysis, the material is now organized as follows.