Investigation of soil available N, P, K and heavy metal concentrations in greenhouse soils was conducted in Shouguang, Shandong Province. Results showed that with age of the facilities, soil available N and P increased significantly in content and soil available K also did, but not so significantly, indicating imbalance of NPK ratio in fertilization. Heavy metals, such as Cu, Zn, Cd and Pb, were higher in greenhouse soil than in the open field, and increased with age of the greenhouse, except for Cd, which did not show a regular rising trend. Their concentrations, however, were still within the national criteria for quality of soil environment.
李见云,侯彦林,化全县,董县中.大棚设施土壤养分和重金属状况研究[J].土壤,2005,37(6):626-629. LI Jian-yun, HOU Yan-lin, HUA Quan-xian, DONG Xian-zhong. VARIATION OF SOIL NUTRIENT AND HEAVY METAL CONCENTRATIONS IN GREENHOUSE SOILS[J]. Soils,2005,37(6):626-629复制