播量与留茬高度对老芒麦产量及品质的影响

Effects of sowing rate and stubble height on the yield and quality of Elymus sibiricus

为研究不同播量和留茬高度对老芒麦(Elymus sibiricus)栽培草地草产量及品质的影响,本研究分析评价了肃南牧区3个不同播量处理的老芒麦在5种留茬高度处理下的再生性能,产量性状和粗蛋白质(CP)、酸性洗涤纤维(ADF)、中性洗涤纤维(NDF)3个品质性状。结果表明,播量对老芒麦再生性能、草产量、粗蛋白质产量、ADF和NDF含量影响极显著(P<0.01),而对粗蛋白质含量无显著影响(P>0.05),且各指标均在播量S2(45kg·hm-2)处理下表现最好。留茬高度则对其都有极显著的影响,且各指标均在留茬高度H6(6 cm)处理下表现最好。两者的互作对再生强度、草产量和ADF含量影响极显著。总体而言,肃南牧区老芒麦栽培草地的利用,在播量45 kg·hm-2、留茬高度6 cm时,不仅再生性能好、干物质产量和粗蛋白质产量高,而且品质好。

In order to study the influence of different sowing rate and stubble height on the yield and quality of Elymus sibiricus,this experiment analyzed the regeneration performance,yield and quality traits including crude protein,acid detergent fiber(ADF) and neutral detergent fiber(NDF) of E.sibiricus under different treatments with3 different sowing rates and 5 different stubble heights.The results showed that the sowing rate had very significant effects(P < 0.01) on regrowth performance,biomass,yield of crude protein,content of ADF and NDF,and had no significant influence on content of crude protein.The plants performed best in the S2(45 kg·hm-2) treatment based on these indices.The stubble height had very significant effects(P < 0.01) on the tested indices which performed best in the H6(6 cm).The interactions between different sowing rate and stubble height had very significant effects(P < 0.01) on regrowth intensity,biomass and ADF content.In conclusion,the best cultivate method of E.sibiricus in Sunan was sowing rate with 45 kg·ha-1and stubble height at 6 cm.