长期不同耕作方式对冬小麦地土壤养分变化的影响

Effects of Different Long-term Tillage Practices on Soil Nutrient Changes in QinterWheat Land

通过7年定位试验,采用免耕、深耕与传统耕作3种耕作方式种植冬小麦,研究不同耕作方式对冬小麦种植地块土壤养分的影响。结果表明:免耕、深耕可以提高土壤中有机质、氮、磷、钾等的含量,且主要表现在表层土壤(0~10 cm)中。免耕和深耕耕作方式下,0~10 cm土层土壤中有机质质量浓度分别为12.60 g/kg和13.60 g/kg;土壤中全氮质量浓度较传统耕作方式提高了32.1%和41.1%;土壤中硝态氮主要存在于20~40 cm土层中,深耕耕作方式下硝态氮质量浓度最高,为20.8 mg/kg;速效磷、速效钾在表层(0~10 cm)土层中质量浓度最高,免耕方式下的相对较高。

Through a 7-year long-term positioning experiment,three kinds of tillage measures,namely,no-tillage,deep-tillage and traditional tillage,were used to plant winter wheat,and the effects of different tillage measures on soil nutrients in winter wheat land were studied.The results showed that no-tillage and deep-tillage could increase the content of organic matter and nitrogen,phosphorus and potassium nutrients in the soil,and they were mainly manifested in the surface soil(0~10 cm).Under no-tillage and deep-tillage tillage measures,the soil organic matter content in the 0~10 cm layer was 12.60 g/kg and 13.60 g/kg,respectively,the soil total nitrogen content was 32.1%and 41.1%higher than that of the traditional tillage;soil nitrate nitrogen mainly existed in the 20~40 cm layer,and the nitrate nitrogen content was the highest in the deep-tillage tillage measure,which was 20.8 mg/kg,the soil quick-acting phosphorus and quick-acting potassium content in the top layer(0~10 cm)was 20.8 mg/kg.potassium were highest in the surface layer(0~10 cm),and relatively high under no-tillage measures.