龙岩市水稻土主要养分变化的研究

对龙岩市水稻土进行农化性状分析,结果表明：全市有机质、速效磷平均含量均属丰富水平;碱解氮属中等水平;速效钾属缺乏水平;稻田缺钾面积比例大,而其他各养分缺乏面积亦有一些比例。与30年前的第二次土壤普查相比,有机质含量渗育型水稻土的提高和潜育型水稻土的降低十分明显,而有效磷、速效钾含量均有显著提高,尤以有效磷变化最为突出;碱解氮和pH值下降,土壤酸化日趋严重。

Variation characteristics of the main nutrient status of paddy soil in Longyan city

The agro-chemistry properties of paddy soil in Longyan city was investigated and analyzed,The results showed that the average contents of organic matter and available phosphorous of paddy soil in the plowed layer were at the high lever.The alkali-hydrolyzable nitrogen content of paddy soil was at the middle level,and the available potassium content was at the absent level.Furthermore,the areas that were deficient in available potassium were at large proportion in Longyan city.The deficient areas of other nutrients status in paddy soils were also found.Compared with the data of The Second General Investigation of Soil Resources in China which had been completed thirty years ago,the contents of organic matter which straight decreased had mostly taken place in percogenic and gleyed paddy soils in Longyan city.Moreover,those contents of available phosphorous and potassium of paddy soils were increased remarkably in Longyan city,especially the change of available phosphorous content.the average content of alkali-hydrolyzable nitrogen and the values of pH in the Longyan city were decreased and soil acidification tended to be more serious.