贵州南部苇状羊茅混播草地营养成份含量动态测定

对在贵州南部地区生态条件下表现优良的草种组合 :苇状羊茅 +扁穗雀麦 +白三叶人工草地各种牧草的各个生育阶段及草地全年各月份营养成份含量进行了测定。结果表明 :四种混播牧草的粗蛋白、粗脂肪和灰分三种营养成份含量都是随着生育期的推后呈线性下降 (P <0 0 1) ,酸性洗涤纤维含量随着生育期的推后呈线性上升 (P <0 0 1) ,无氮浸出物的含量变化跟生育期无明显联系 ;混播草地全年各月份营养成份含量变化规律为 :粗蛋白、粗脂肪及灰分在 1～ 7月份较高 ,8、9、10月份最低 ,11、12月份又逐步回升 ,粗蛋白含量尤以 4、5、6月份含量最高。酸性洗涤纤维的含量变化跟粗蛋白等情况相反 ,无氮浸出物含量各月间无显著变化。

Determining on the change trends of nutrient composition content of mixed sowing grassland with tall fesuce in the south area of Guizhou

The content of the nutrient compositions in every growth period and in every month of different kind of herbage of the mixed sowing grassland with fesuce grass+perennial rye grass+flat ear grain brome grass+white colver were determined.The results showed that:①The content of crude protein,crude fat and crude ash declined linearly with the passing of growth period(p<0.01),but contrary results appeared with acid detergent fibre (P<0 01);②The content change of extracts of nitrogen-free hadn't obvious relationship with the growth period;③The content of crude protein,crude fat and crude ash were high from January to July,lowest from August to October,and rised again step by step from November to December.The highest content of crude protein appeared in April,May and June.The change trends of acid detergent fibre was just contrary to crude protein.④The content of extracts of nitrogen-free hadn't obvious change in a year.