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太湖地区是我国著名的高产地区之一,近年来,在施肥上偏施氮肥,很少施用化学钾肥,氮、磷、钾比例极不协调。而由于三熟制的推广,产量的提高,土壤钾素消耗增多,钾素的亏缺加剧。为了解本地区土壤的供钾能力,我们收集了太湖地区的主要土壤,并进行了钾素释放试验、田间定位试验及盆栽试验,主要结果如下。
The Taihu Lake region is one of the famous high-yielding areas in China. In recent years, nitrogen fertilizer has been applied to fertilization and chemical potassium fertilizer has been seldom applied. The proportions of nitrogen, phosphorus and potassium are extremely uncoordinated. However, due to the promotion of three-cropping system and the increase of production, the consumption of soil potassium increased, and the shortage of potassium increased. In order to understand the potassium supply capacity of the soil in this area, we collected the main soils in the Taihu Lake region and carried out potassium release test, field positioning test and pot experiment. The main results are as follows.