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一、种草的产草量与降水人工种草和种粮食一样,跟气候条件有密切关系。分析研究中部地区定西、通渭、会宁等县人工种草产草量的调查,试验资料得出:在干旱、半干旱地区,紫花苜蓿、草木樨的产草量除与自身的生育规律有关外,主要取决于降水量的多寡,降水多的地区或年份,产草量高;降水量少的干旱地区或年份,产草量低(表1)。计算各地紫花苜蓿、草木樨的产草量与≥0℃期间降水量之间的线性方程为:
First, the grass production of grass and precipitation of artificial grass and the kind of food, with climatic conditions are closely related. The investigation and study of the artificial grass production in Dingxi, Tongwei and Huining counties in central region of China were conducted. The experimental data showed that in the arid and semi-arid areas, the yield of alfalfa and herbivores was related to their own reproductive patterns , Mainly depends on the amount of precipitation, areas or years with heavy precipitation, high grass production; dry areas or years with low precipitation and low production (Table 1). Calculated around the alfalfa, grass mulberry yield and precipitation ≥ 0 ℃ during the linear equation between: