海南省万宁市水稻土壤养分状况研究

为探明万宁市水稻土养分状况，采集3 061个水稻土耕作层土样进行养分测定, 并与第2 次土壤普查数据进行比较分析。结果表明：土壤有机质和全氮含量属中等水平，并呈下降趋势；有效磷有较大幅度提高，速效钾也有所提高。但是有效磷钾含量不高，全市耕地土壤少磷缺钾状况依然存在。

Soil Nutrients Status in Paddy Field in Wanning, Hainan Province

In order to have a good understanding of the soil nutrients status in the paddy field in Wanning, Hainan, 3061 soil samples were collected in paddy cultivated layer and analyzed routinely, and the resultant data were compared with those of the Second Soil Survey. Data comparison indicated that the contents of soil organic matter and total N were at a medium level and tended to decrease in the paddy field. The soil available phosphorus was increased greatly, and the soil available potassium increased as well. However, the contents of the soil available phosphorus and the soil available potassium were very low, and the soil P and K in the arable land are still poor in Wanning.