棉花-花生在不同间作模式下土壤养分的变化特点

The Changeable Characteristics of Soil Nutrients under Different Types of Intercropping of Cotton and Peanut

通过田间试验研究了棉花－花生在不同间作模式下土壤养分的变化，结果表明：棉花－花生在合理的间作条件下，土壤养分有一定的互补作用。棉花能充分利用花生固定的氮，花生能利用棉花活化的土壤磷；棉花－花生间作，要注意钾素的补充。间作距离小，这两种作物一方面发生养分竞争，更主要的是地上部竞争，影响经济产量。

The changes of soil nutrients were studied by the field experientment. The result showed that the nutrients provided by the soil for the cotton growth could be used by the peanut, and it is the same with the peanut under the reasonable type of intercropping. The cotton could make good use of the nitrigen made by the peanut, the peanut could use the phorosphous activated by the cotton, the potassium should be added to the cotton and the peanut. The distance between the cotton and the peanut must be reasonable. If it was shorter. The cotton would competwith the peanut for nutrients, water, air, as well as light. If the distance is longer, the characteristic of nutrients is similar with monocropping.