Study on the Effects of Planting Medicago sativa L.on Soil Nutrients in High-cold Area
WEI Wei-dong (College of Agriculture and Animal Husbandry,Qinghai University,Xining,Qinghai 810003)
[Objective] The aim of the research was to discuss the effects of planting Medicago sativa L.on the soil nutrients in high-cold area.[Method] In field experiment,the changes of soil nutrients such as organic matter,nitrogen,phosphorus and potassium after planting M.sativa in high-cold area were studied.[Result] Planting M.sativa in high-cold area could obviously increase the contents of organic matter,total nitrogen and alkaline-hydrolytic nitrogen,while the changes of total phosphorus content were relatively weaker.After planting M.sativa for 2 years in high-cold area,the contents of organic matter,total nitrogen and hydrolysable nitrogen in cultivated soil were increased by 17.70%,14.45% and 13.53% resp.,while the contents of total potassium,available phosphorus and available potassium were decreased by 1.63%,9.03 % and 12.67% resp.[Conclusion] Planting M.sativa in high-cold area could improve the nitrogen level in soil.In its planting process,phosphorus and potassium should be applied to play the functions of raising up land fertility,improving the soil and controlling the soil and water loss.
【CateGory Index】： S541.9