| Based on the results of experiments,the process of biomass accumulation and soil water consumption of alfalfa has been simulated with mathematical statistical method,so as to find the character of its accumulated biomass and the law of soil water utilization.It was discovered: before blooming,the accumulation of biomass of first-year alfalfa was mainly concentrated in the above-ground part,and the ratio of above-ground to underground dry matter was 2.92;but after blooming,the accumulation of biomass was turned mainly to the underground part,and the ratio of above-ground to underground dry matter was 0.57.The soil water storage in the field of alfalfa was less than that of grain crops,and the water consumption in the field of alfalfa was larger than that of grain crops.The rate of soil water utilization of alfalfa was 2.1 to 2.8 times that of wheat,and 2.0 to 2.5 times that of corn. |