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三处田间试验表明,施氮肥和机械灭茬对肯塔基草地早熟禾种子产量都有影响,所有试验中施氮肥及灭茬高度(0～2.5cm)处理都增加了种子产量,三年生草地较其五年生草地有较大的增产幅度。施氮肥能增加草丛密度、草丛产量及植株产量;灭茬能增加草丛密度但减少丛重、茎高及植株产量,而另一方面却增加了收获指数。
Three field experiments showed that both nitrogen fertilizer and mechanical stubble affected Kentucky bluegrass seed yield. In all the treatments, seed yield was increased by applying nitrogen and stubble height (0 ~ 2.5cm) Grass has a larger yield increase. Nitrogen fertilizer can increase the grass density, grass yield and plant yield; stubble can increase the grass density but reduce the weight, stem height and plant yield, but on the other hand increased the harvest index.