刈割时间和次数对牧草产量和品质的影响

EFFECT OF CUTTING FREQUENCY ON YIELD AND QUALITY OF FORAGE GRASSES

研究了刈割时间和频率对牧草产量和品质的影响，结果表明：刈割间隔时间的延长使牧草的茎／叶比值和粗纤维含量显著增加，粗蛋白、粗灰分、Ｐ、Ｋ等的含量显著下降，其中Ｋ下降的幅度最大，其次是粗灰分、粗蛋白和Ｐ等．刈割时间对粗脂肪、Ｃａ、Ｍｇ的含量影响不大，没有统计学上的差异．适宜的刈割频率可提高牧草的产量和质量，隔５０－５５ｄ收割１次，可使牧草的产量和质量均维持较高的水平，隔５７ｄ割１次，牧草的蛋白质含量略有下降，而粗纤维含量却有不同程度的上升．

Experiment of the effects of cutting frequency on yield and quality of four forage grasses, Pennisetum purpureum × P. glaucum, Pennisetum glaucum×P. purpureum, Pennisetum purpureum and Zea mays subsp. mexicana, showed that the stem/leaves ratio and crude fiber contents in forage grasses were increased with prolonged interval of cutting time, however, the contents of crude protein, crude ash, P and K in forage grasses were decreased, the ranking being K>crude ash>crude protein>P.The change in crude ...