秸秆还田与减施氮肥对双季稻产量及土壤理化性质的影响

Effects of Returning Double-Season Rice Straw to the Field and Reducing N-fertilizer on Yield and Soil Physicochemical Properties

为探究秸秆还田条件下,减施氮肥对海南双季稻产量及土壤理化性质的影响。以海南省文昌市水稻田为研究对象,展开双季稻田间小区试验,设置常规施肥(CK)、秸秆还田+常规施肥减氮10%(T1)、秸秆还田+常规施肥减氮30%(T2)、秸秆还田+常规施肥减氮50%(T3)4种施肥处理方式。结果表明,秸秆还田条件下,减少10%氮肥施用不但可以有效降低土壤容重、提高土壤孔隙度、增加土壤的养分含量,还能明显增加双季稻的产量(早稻增产8.04%,晚稻增产4.17%),具有较好的减肥增产效果。

This study aimed to investigate the effects of returning double-season rice straw to the field and reducing N-fertilizer on yield and soil physicochemical properties.The experiments were conducted in Wenchang city,Hainan province,and four treatments were set,namely CK(conventional fertilization),T1(straw-retum+conventional fertilization with 10%nitrogen reduction),T2(straw-retum+conventional fertilization with 30%nitrogen reduction)and T3(straw-retum+conventional fertilization with 50%nitrogen reduction).Under the conditions of this study,the combined management mode of T1(straw-retum+conventional fertilization with 10%nitrogen reduction)could effectively reduce the soil bulk density,enhance soil porosity,add the soil nutrient content,and increase double-season rice yield(increase yield by 8.04%in early rice and 4.17%in late rice),which has better effects in less fertilizer application and increasing double-season rice yield.