球茎草芦营养成分动态分析

Dynamic Analysis for Nutrient Compositions of Phalaris tuberosa

对球茎草芦不同生长年限、不同生育时期营养成分动态测定结果表明：不同生长年限球茎草芦的蛋白质、灰分含量均随生育时期的推后呈线性下降（P〈0．05），粗纤维和粗脂肪含量随生育时期的推后呈线性上升（P〈0．05），无氮浸出物的含量变化与生育期无明显相关，粗蛋白含量随生长年限的推后逐渐下降，而磷、钙含量则以4年生最高；1～4年生分蘖期至抽穗期粗蛋白含量在13．42％～16．96％，而粗纤维含量在21．03％～32．88％，是西南地区优质地方牧草品种，具有广泛的推广广应用前景。

The nutrient composition of Phalaris tuberosa is determined at different growth years and periods to investigate the dynamic change of different nutrient compositions. The results show that the contents of crude protein and crude ash in different growth years linearly decline with the delay of growth period （P〈0.05）, the contents of acidity detergent fiber and crude fat linearly increase with the delay of growth period, the content of crude protein decreases with the delay of growth period, there is no obvious relationship between the content change of extracts with nitrogen-free and growth period, the maximum contents of phosphorus and calcium are determined in Phalaris tuberosa with four years old and the crude contents of protein and crude fiber between tillering and heading period are 13.42%- 16.96% and 21.03% -32.88% respectively, which expresses that Phalaris tuberosa is a good quality local herbage variety worth popularization.