Effects of Different Cultivation Mode on Soil Nutrition in Vegetable Field in Suburban Areas

The changes of soil nutrition in different cultivation mode were studied. The results showed that the soil alkalihydrolyzed N was positively related to the changes of organic matter content, and available N could reflect soil nitrogen supply lately, so increasing organic matter in soil is an important method to improve soil fertility. Fertilization is an important resource of available K in soil. Straw to field has a significant effect on available K in K deficiency soil. Long-term continuous cropping in vegetable cultivation will add to the burden of the soil, and be not beneficial to the sustainable use of vegetable field in suburban areas. The rice -vegetable cropping system is beneficial to lighten the accumulation of available P.