稻田复种制对土壤理化性状的影响及其经济效益分析

Effect of Multi-cropping Systems in Paddy Field on Soil Physical and Chemical Properties and Its Economical Benefits

对洞庭湖区潮沙泥田的主要复种制度进行了2年田间试验,结果表明:不同复种制度对土壤理化性状影响不同。春大豆-杂交晚稻、春大豆间玉米-杂交晚稻等水旱复种制明显改善土壤物理性状,降低土壤中的还原物质含量和厌气微生物数量,明显提高土壤中速效磷、钾含量,土壤中的有益微生物和酶活性也有一定的增加。水旱复种制促进了晚稻产量的提高,在产投比和投肥效率上也明显高于双季稻种植制度。

The experiments on main multi-cropping systems in Alluvial loamy paddy soil of Dongting Lake area was conducted for two years. The results showed that the effect of different multi-cropping systems on soil physical and chemical properties were different. Multi-ropping systems of bean-flee and corn- flee were good for improving soil physical properties obviously, then reducing the content of soil reductive n^atter and anaerobic microorganism, in^ing the content of available phosphorus and potassium, and raising the activity of beneficial microorganisms and enzyme. Especially, yields of late flee were increased significantly by rotation system of rice and dry crop, and the output and input ratio and the efficiency of fertilization were increased significantly.