Abstract:

The vegetable soils in greenhouses and open-air were collected for the investigation of organic matter and nitrogen contents in Wuxi, Zhenjiang, Yangzhou, Suzhou and Changzhou of Yangtze River Delta. The results showed that these vegetable soils were rich in organic matter and inorganic nitrogen, but the content of total nitrogen was relatively low. The content of organic matter and total nitrogen decreased with the increasing soil depth, however, the inorganic nitrogen was high in the deep layer soils due to leaching. Comparatively, there was no significant difference of soil organic matter and nitrogen between in the greenhouse and open-air field.