连续施用堆肥污泥提高小麦-玉米轮作下酸性水稻土肥力

Improving Acid Paddy Soil Fertility by Continuous Sludge Application Under Wheat-maize Rotation

为了探讨堆肥污泥用量及施用年限对酸性水稻土改种小麦-玉米后养分变化特征的影响,采用盆栽试验,通过设置5个堆肥污泥施用量:0 t/ha(对照)、3.75 t/ha、7.50 t/ha、37.50 t/ha和75.00 t/ha,研究堆肥污泥施用对酸性水稻土养分等主要理化特征的影响。研究结果表明:同一生长季中,土壤pH值、有机碳、全氮、碱解氮、速效磷、全磷、速效钾的含量均随堆肥污泥添加量及施用年份的增加而增加。与对照相比,小麦季和玉米季,堆肥污泥施用量分别为7.50 t/ha和37.50 t/ha时,土壤全磷、速效钾含量显著增加;堆肥污泥用量为37.50 t/ha时,作物各生长季供试土壤pH值及全氮含量显著增加,且土壤肥力提升最多。短期内堆肥污泥施用量为37.50 t/ha时,能有效改善酸性水稻土酸化和肥力状况。

In order to investigate the effects of the amount and application years of compost sludge on the nutrient change characteristics of acidic paddy soil after planting wheat and maize,the pot experiment was adopted to study the effects of compost sludge application on the main physical and chemical characteristics of acid paddy soil by setting five compost sludge dosage of 0 t/ha(control),3.75 t/ha,7.50 t/ha,37.50 t/ha and 75.00 t/ha.The results show that in the same growing season,the soil p H,the content of organic carbon,total nitrogen,available nitrogen,available phosphorus,total phosphorus and available potassium are all increased with the increasing of compost sludge addition and application year.Compared with the control,in wheat season and maize season,when the application rate of compost sludge is 7.50 t/ha and 37.50 t/ha,respectively,the soil total P and available K are increased significantly.When the amount of compost sludge is37.50 t/ha,the p H value and total nitrogen content of soil are increased significantly in each growing season,and the soil fertility is increased the most.The application rate of compost sludge at 37.50 t/ha can effectively improve acidification and fertility of acid paddy soil.