不同留茬高度对3种禾草草产量和品质的影响

Effect of different stubble heights on grass yield and qualityof 3 graminious forages

以3种3龄单播禾草为对象,研究了不同留茬高度0cm(CH0),2cm(CH2),4cm(CH4),6cm(CH6),8cm(CH8)对草产量及牧草品质的综合影响。结果表明,中华羊茅草产量随留茬高度的增加呈先增加后降低的趋势,冷地早熟禾和青牧1号老芒麦呈现先降低后增加的趋势。中华羊茅与冷地早熟禾均在CH6时草产量最大,分别为233.36g/m2,197.69g/m2,而青牧1号老芒麦的最大草产量(236.11g/m2)出现在CH0时。第1次刈割,随留茬高度的增加,草产量下降,再生速度和粗蛋白含量先增后降,粗纤维含量先降后增;第2次刈割,随留茬高度的增加,3种禾草草产量、粗蛋白和粗纤维含量先增加后降低,在留茬高度为CH6时均达到最大值,总有机碳含量于CH8达到最大值,再生速度变化不明显。刈割留茬高度CH6和CH8保持了较高的生产力和营养品质。

The comprehensive influence of different stubble heights（0cm,CH0;2cm,CH2;4cm,CH4;6cm,CH6;8cm,CH8）on forage yield and quality of 3graminious forages were studied.The results indicated that with the raising of stubble height,the forage yield of Festuca sinensis increased firstly and then reduced,and it was contrary to Poa crymophila and Elymus sibiricus cv Qinghai No.1.The maximum forage yields of F.sinensis and P.crymophila were 233.36g/m,197.69g/m respectively in CH6.The maximum forage yield of E.sibiricus cv Qinghai No.1was 236.11g/min CH0.In the first cutting,the forage yield gradually reduced along with the increasing of stubble height,the regeneration rate and crude protein content increased firstly and decreased subsequently,and it was contrary to the content of neutral detergent fiber.In the second cutting,the forage yield,the contents of crude protein and neutral detergent fiber increased firstly and decreased subsequently,and the peak values were obtained in CH6.The content of total organic carbon had the peak value in CH8.The variation of regeneration rate was not obvious.The productivity and quality of forage were higher in CH6 and CH8.