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根据我们对我省不同土壤交换性钾和非交换性钾的测定以及棉花的钾肥试验,初步确定我省白土类型土壤,沿江沙土和沙壤土,徐淮地区沙土为缺钾土壤(交换性钾含量10—20斤/亩,非交换性钾65—200斤/亩),苏州地区黄泥土钾的供应也不充足(交换性钾18—24斤/亩,非交换性钾60—80斤/亩),里下河地区湖积物发育的土壤和滨海地区土壤钾的供应丰富(交换性钾40—70斤/亩)非交换性钾200—300斤/亩)。三年棉花钾肥试验指出,当土壤交换性钾含量低于25斤/亩时,施用钾肥有显著增产效果。土壤含钾水平愈低,钾肥增产效果愈显著。钾肥能减轻红叶茎枯病,防止早衰。钾肥能减轻苗期病害,保证壮苗全苗。钾肥能增加铃重,促使棉铃吐絮畅,棉花品质好。蕾期田间棉株钾素营养诊断,可作为棉花追施钾肥的参考。
According to the determination of exchangeable potassium and non-exchangeable potassium in different soils of our province and the potash experiment of cotton, we initially determined that the clay in the soil of our province, the sand and sandy loam along the river and the soil in the Xuhuai area are potassium deficient soil (exchangeable potassium content 10 -20 kg / mu, non-exchangeable potassium 65-200 kg / mu), potassium supply in the Yellow Soil in Suzhou is not sufficient (exchangeable potassium 18-24 kg / acre, non-exchangeable potassium 60-80 kg / acre) , Lixiahe area lake sediment development of soil and coastal areas of the rich supply of soil potassium (exchangeable potassium 40-70 kg / mu) non-exchangeable potassium 200-300 kg / mu). Three years of cotton potassium fertilizer test pointed out that when the soil exchangeable potassium content of less than 25 kg / mu, the application of potassium increased yield significantly. The lower the potassium content of soil, the more obvious the effect of increasing potassium fertilizer. Potassium can reduce stem blight, prevent premature aging. Potassium can reduce the disease at seedling stage, to ensure strong seedlings seedlings. Potassium can increase boll weight, boll cotton boll, cotton, good quality. Bud field cotton plant potassium nutrition diagnosis, cotton topdressing can be used as a reference.