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我市棉田面积71.4万亩,主要分布在沿江的沙洲、常熟、太仓三个县(市)内,属长江老冲积土区。土质沙性较重,70％的棉田为潮沙土和夹沙土,土壤含速效钾较低,每亩为18—24斤(60—80ppm);只有30％为乌夹沙,土质粘性较高,土壤含速效钾每亩30斤(100ppm)左右,含钾中等。沿江老棉田,含速效钾更少,每亩为15斤(50ppm)左右,棉花经常出现早衰,后期红叶茎枯病面积较大,部分还有落叶现象,严重影响产量。我市从1974年开始进行棉花施钾试验,1979—1981年边试验、边大面积推广应用,对棉花起到了较大的增产作用,获江苏省1983年科技改进三等奖。
Our city area of 71.4 acres of cotton fields, mainly in the sand along the Yangtze River, Changshu, Taicang three counties (cities), is the Yangtze River alluvial soil. 70% of the cotton field is tidal sandy soil and sand-holding soil, the soil contains low available potassium, 18-24 kg per acre (60-80ppm); only 30% is wadding sand, the soil has higher viscosity, Available potassium soil per acre 30 kg (100ppm) or so, potassium medium. The old cotton fields along the river, with less available potassium, per acre is about 15 pounds (50ppm), cotton often premature aging, late blight stem blight larger, some still leaves phenomenon, seriously affecting the yield. Since 1974, the city started to test the potassium application in cotton. While testing in 1979-1981, the city popularized and applied it in a large scale and played a greater role in increasing cotton production. It won the third prize of science and technology improvement in 1983 in Jiangsu Province.