Study on Effects of Raw Organic Matter Return and Crop Systems on Soil Environment

DONG Wanru (Qinghai Academy of Agriculture and Forestry, Xining810016, China)

Raw orgnic matter return; Crop systems; Soil organic-mineral complex; Soil enzymes; Soil physical and chemistry property

Crop yields is comprehensive index of soil fortility. Crop yields had good correleation to soil organicmineral complex guantity (r=0.7032, t=4.53>t0.01=2.83. Comparing simulated results with measured values showed that the raw organic matter return was correlated to soil organic matter, and showed that increase in soil organicmineral complex was correlated to in crement of soil organic matter (r=0.864, t=7.84>t0.01=2.95), and increased the crop yields and improved soil organicmineral complex guantity. Return of green manure and wheat straw, rotation of crop and green manure, and intercropping of whead and green manure could improve soil organicmineral complex, soil physical progerty and activity of soil enzymes. It was an effective and feasible measure to maintain good soil environment and soil moisture. Soil organicmineral complex and activity of soil enzymes can be used as indicator for soil fertilitg and management of land at the same time.