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本文研究不同利用期对四川巫溪县红地坝亚热带高海拔地区红三叶人工草地11种营养元素含量和积累速率的影响，结果如下：不同季节，即3～5月（Ⅰ）、6～7月（Ⅱ）和8～9月（Ⅲ），对红三叶营养元素含量和积累速率的影响如下：氮、磷、钙、镁．标的含量为Ⅰ＜Ⅱ＜大，钠为Ⅰ＞Ⅱ＞Ⅲ，钾、铜、钴为Ⅱ＞Ⅰ＞Ⅲ。锌的含量三者相近。营养元素最大积累速率出现的顺序为Ⅱ＞Ⅰ＞Ⅲ。红三叶在不同生育期对营养元素含量和积累速率的影响如下：随着生育期的后移，氮、磷、钾、铜、锌含量通常逐渐下降。在相同生育期的条件下，再生草与刈前比较，氮、磷、钾、铜、锌的含量较低，而钙含量较高。在生长初期营养元素的平均积累速率较低，但随着利用期的推迟而逐渐升高。在现蕾—开花期利用，大多数元素的平均积累速率最高。
In this paper, the effects of different periods of use on the contents of 11 nutrient elements and the accumulation rate of red clover artificial grassland in Hongdiba subtropical highland in Wuxi County were studied. The results are as follows: In different seasons, ie March ~ May (Ⅰ), 6 ~ The effects of July (Ⅱ) and August ~ September (Ⅲ) on the nutrient content and accumulation rate of red clover were as follows: nitrogen, phosphorus, calcium and magnesium. The contents of the standard Ⅰ> Ⅱ Ⅱ> Ⅲ, potassium, copper and cobalt Ⅱ> Ⅰ> Ⅲ. The content of zinc is similar to the three. The order of maximum nutrient accumulation rate is Ⅱ> Ⅰ> Ⅲ. The effects of red clover on nutrients content and accumulation rate at different growth stages were as follows: The contents of nitrogen, phosphorus, potassium, copper and zinc generally decreased gradually with the later growth period. Under the same growth period, the contents of nitrogen, phosphorus, potassium, copper and zinc were lower and the calcium content was higher in the regenerated grasses than that before the grazing. The average rate of nutrient accumulation at the beginning of growth was lower, but gradually increased with the delay of use. In the bud-flowering period, the average accumulation rate of most elements is the highest.