Effect of Vanillin on Nutritient Absorbency of China fir Seedlings A study on the physiological properties of root systems in various wheat varieties and the effects of their phosphorus uptake and utilization efficiency on the yields Effects of soaking seeds with DPC on the physiological functions of root system and leaf of peanut seedlings The correlation of dry biomass and activity of root system with grain yield in raton rice(Oryza sativa L)