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运用定位观察法测定了不同生育年龄紫花苜蓿草地地上生物量，经统计分析建立了紫花苜蓿草地地上生物量季节动态模型和年度动态模型，确定了不同生育年龄紫花苜蓿草地的最佳打草期和有效利用年限。
The above-ground biomass of alfalfa grasslands with different growing ages was determined by the method of location observation. The seasonal dynamic model and annual dynamic model of aboveground biomass of alfalfa grassland were established by statistical analysis. The optimal grass-planting period and the annual dynamic model of alfalfa grassland were determined, Effective use of life.