密度对杂交狼尾草产量和品质的影响

2004年4-9月在内蒙古西辽河平原研究了密度对杂交狼尾草牧特利Pennisetum glaucumcv.Nu-trifeed产量、品质及农艺性状的影响。结果表明,草产量随种植密度增加而增加,但由于其分蘖调节作用显著而产量增幅较小;粗蛋白含量随种植密度增加而下降,粗纤维含量、茎叶比均随密度增加而增高;各种植密度下粗蛋白含量均随刈割茬次的增加而降低,粗纤维含量及茎叶比则随刈割茬次的增加而增大;随种植密度的增加,有效分蘖下降而叶面积指数增加。综合密度对产量、品质的影响,认为研究地区牧特利的适宜种植密度为13.3万株/hm2左右。

Effects of plant density on yield and quality of Pennisetum glaucum

The effect of plant density on the agronomic characteristics,yield and quality of Pennisetum glaucum cv.Nutrifeed was studied in Liaohe farmland in Inner Mongolia from May to September in 2004.The results showed that the forage yield was increased along with the increase of density,but because of the remarkable regulating effect of its tillering ability,the extent of yield increase was small.The crude protein(%) was reduced with the increase of density,the crude fiber(%) and stem/leaf ratio was increased;under all plant densities,the crude protein(%) was reduced with increased cutting times,but the crude fiber(%) and ratio of stem to leaf was increased with increased cutting times.Leaf area index(LAI) was increased and tillering ability reduced along with the increase of density.General analysis showed that plant density of Nutrifeed increasing to 133 333 plant/hm~2 has the best yield and quality