不同灌溉方法对保护地土壤磷·钾的影响

Effect of Different Irrigation Methods on Soil Phosphate and Potassium in Protected Field

研究了连续7年以不同灌溉方法进行灌溉的保护地土壤磷、钾含量及其剖面分布,结果表明:3种灌溉方法下土壤全磷含量随土层深度的增加而递减,10～20 cm层全磷含量达到最大值;速效磷含量总体变化趋势与全磷相似。不同灌溉方法下土壤全钾含量19.013～19.990 g/kg,底层全钾含量明显高于表层;3种灌溉方法下土壤速效钾含量随土层深度增加均呈倒置的“S”形分布,0～20 cm层速效钾含量最高。

The effect of different irrigation methods on soil phosphate and potassium was determined in a protected field and the same irrigation experiment was conducted for seven years. The results showed that total phosphate was decreased with the difference of soil depth in the three irrigation methods. The content of total phosphate was the highest at 10-20 cm soil in depth. The available phosphate changed similarly with total phosphate. However, the potassium was higher at subsoil than topsoil with the change of content of potassium from 19.013-19.990 g/kg.