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通过总结新疆培肥地力的历史经验和中国科学院阜康荒漠生态站长期定位试验成果（１９９１～１９９８），说明单施化肥则化肥利用率逐年下降，需要有机和无机肥料配合施用才能培肥地力促进营养元素良性循环。提出并确立了良性养分循环指数，用作农业生态系统能否持续发展的数量化指标。该指数是以系统内最活跃的因素养分Ｎ的两个函数乘积来表征。一个是Ｎ的产投比标志着系统的较高经济效益，另一个是有机Ｎ再循环系数，显示该系统通过有机Ｎ投入，应有较大幅度盈余，才能不断培肥地力，达到绿洲农业生态系统营养元素的良性循环。
Through summarizing the historical experience of soil fertility in Xinjiang and long-term positioning test results (1991-1998) of the Chinese Academy of Sciences at the desert ecosystem station, it shows that the chemical fertilizer application rate is decreasing year by year. The organic and inorganic fertilizers need to be applied in order to promote soil fertility Nutrient elements virtuous circle. Proposed and established a good nutrient cycle index, as a quantitative indicator of the sustainable development of agro-ecosystems. The index is characterized by the product of two functions of nutrient N, the most active factor in the system. One is the ratio of production to output of N indicates the higher economic efficiency of the system and the other is the organic N recirculation coefficient. This shows that the system should invest a relatively large amount of surplus so as to continuously fertilize the fertility and achieve the oasis agro-ecological System of healthy elements of the virtuous circle.