A Study On Relationship Between Plants And Soil In Alfalfa Field In China

As one of high quality forage grass of alfalfa has an important position and role in animal husbandry, agricultural structural adjustment and ecological construction. In this paper, the national scale alfalfa main region of soil fertilizer characteristics, main nutrients levels alfalfa plants, and the clover to fertilizer application present situation has carried on the investigation and study, at the same time using the spectrometer collection in the field of crop canopy spectral information, and the yield of alfalfa TouCha data and a comparative study of the main nutrition elements content in plants.The results show that:1.Alfalfa producing nitrogen in the soil is rich, available phosphorus content is moderate, rapidly-available potassium content and soil cation exchange capacity is higher; In producing alfalfa plants of nitrogen nutrition is adequate, phosphorus and potassium deficiency, trace elements of zinc, boron and molybdenum element deficiency.2The content of soil total phosphorus and available phosphorus showed significant correlation with yield, the linear regression equation of soil total phosphorus content with yield is y=4341.661+1802.23x,R2=0.215,P<0.05; the equation of soil available phosphorus with yield is y=75.093+3866.378x, R2=0.206, P<0.05.3. The contents of iron, boron, molybdenum has a significantly correlated with yeild.(P<0.05), yields with boron linear equation is:y=42.345+3399.1x, R2=0.242, P<0.05. Production and iron linear regression equation is:y=4.797+3685.95x, R2=0.318, P<0.05. Production and molybdenum linear equation for y=3209.776+3342.868x, R2=0.446, P<0.05).4. In addition, the red reflectance and vegetation index NDVI associated with production. The vegetation index NDVI of the linear equation y=38.073x-26.667, R2=0.502, P<0.05. Yield and vegetation red light reflectance of linear equation y=2.1467+12.264x, R2=0.488, P <0.05. 5.The content of potassium in the alfalfa has a remarkable correlation to reflectance of red-edge,reflectance of near-infrared and vegetation index of NDRE. The content of iron in the alfalfa has a remarkable correlation to vegetation index of REVI.