湖州市区水田土壤养分的变化分析

[目的]为了摸清湖州市区水田土壤肥力状况,为科学指导农作物测土配方施肥提供依据。[方法]于2004年采用重铬酸钾氧化法、半微量凯氏法和等离子体光谱法等检测了湖州市区318个水田土样的有机质、全氮、有效磷、速效钾及pH值,并与第2次土壤普查结果进行了比较。[结果]湖州市区水田土壤有机质丰富,全氮含量较高,普遍缺磷,严重缺钾。有机质、全氮、有效磷和速效钾的平均含量分别为36.5 g/kg1、.9 g/kg、14.6 mg/kg和78.3 mg/kg。[结论]与1984年第2次土壤普查相比,有机质、全氮含量基本持平,有效磷大幅提高,速效钾有所增加,土壤酸化现象明显。

Analysis of the Nutrients Change of Paddy Field in Huzhou Urban Area

The investigation of the soil fertility of paddy field in Huzhou urban area was carried out,which provided the basis for guiding formula fertilization by soil testing in crops scientifically.The organic substance,total nitrogen,valid phosphorus,quick-acting potassium and pH value of 318 paddy soil samples in Huzhou urban area were determined with the methods such as potassium dichromate oxidation method,semi-micro Kjeldahl method and plasma spectrum method in 2004.The result was compared with the second soil census result.The paddy soil in Huzhou urban area was rich in organic substance,high in total nitrogen content,generally lack of phosphorous and seriously lack of potassium.The average contents of organic substance,total nitrogen,valid phosphorous and quick-acting potassium were 36.5 g/kg,1.9 g/kg,14.6 mg/kg and 78.3 mg/kg respectively.Compared with the second soil census of 1984,the organic substance and total nitrogen contents remained stable,the valid phosphorous content enhanced largely,the quick-acting potassium content increased slightly and the soil acidifying phenomenon was obvious.