Effects of Fertilizing on Millet Rootshoot Growth, Rhizospheric Soil Enzyme and Microbe in Immature Soil in North China Effect of different base fertilizers on yield components,physiological and biochemical traits of winter wheat Effects of Alfalfa Root Growth on Improving Immature Soil of Loess Parent Material Biological response of pioneer plant Macleaya cordata to N and P stresses under different water conditions