Investigation On Situation Of Environmental Quality For Basic Arable Lands In Minghang Distract

At present, safety of agricultural products has become a very attentive issue for both government and public. Of the factors affecting safe quality of agricultural products, environmental quality of arable lands is utmost important. Investigation on situation of environmental quality for arable lands in Minhang distract, Shanghai is necessary for production of safe and high-quality agricultural products, for enhancement of agricultural development and adjustment of cropping system, for enlargement of open space and investment from foreign countries or other areas, and is also important for increasing farmers' income and stimulating sustainable development of agriculture.In the current research, the tendency in the change of soil environmental quality happened in China as well as world was reviewed and the damage caused by contamination was illustrated. Then the significance of investigation on situation of environmental quality for arable lands was highlighted. The soil survey and analysis showed that the quality of arable lands in Minhang distract was generally fair. Among the field samples examined, 3 samples, consisting of 2.61% of the total samples belonged to the scale 1 in the quality of arable lands, 80 samples (69.56%) belonged to the scale 2, 20 samples (17.39%) belonged to the scale 3, and 12 samples (10.43%) belonged to the scale 4, which is below acceptable level for agricultural production. The major contaminants were heavy metal cadmium and excessive Zinc and Copper. For the irrigated water, all samples taken from all villages and towns were the scale 2 or higher, and there were 25 samples, consisting of 83.33% of total samples, belonged to the scale 1. According to the results of soil survey and analysis, the strategies for controlling contamination of arable lands were proposed as follows:(1) Better management of release and placement of waste water and solid waste in industry;(2) Strict operation based on the controlling standard for use of waste sludge and waste water;(3) Effective remediation of spot and surface contamination of arable lands; (4)Highlighting development of ecological and sustainable agriculture.