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对３年的干草产量和种植前后土壤５种主要养份含量的测定结果表明，有机质、有效磷、速效钾和全氮４种养份种植后含量降低，只有水解氮含量增加。通过相关和回归分析，５种土壤养份含量的变化与干草产量之间存在明显的直线回归关系，其回归效果都达到显著（Ｐ＜０．０５）或极显著（Ｐ＜０．０１）水平。此结果在紫花苜蓿种植生产实践中，对达到高产和培肥地力具有一定的指导意义。
The results of three years of hay production and five main nutrient contents before and after planting showed that the content of organic matter, available phosphorus, available potassium and total nitrogen decreased after planting, but only the content of hydrolyzed nitrogen increased. Through the correlation and regression analysis, there was a clear linear regression relationship between the changes of soil nutrient contents and the yields of hay. The regression results were significant (P <0.05) or very significant (P <0.01) . This result has certain guiding significance in the alfalfa planting and production practice to achieve high yield and fertility.