不同收割高度和留茬高度对杂交构树产量、营养成分及消化率的影响

Effect of different harvesting height and stubble height on yield,nutrient composition and digestibility of hybrid Broussonetia papyrifera

试验旨在研究不同收割高度和留茬高度对杂交构树生物学产量、营养成分以及消化率的影响。试验设置不同的收割高度(100、120、140、160 cm)和不同的留茬高度(20、30、40 cm),收割后计产并进行营养成分测定和消化率的测定。结果显示,杂交构树的产量、营养成分和消化率受收割高度和留茬高度的双重影响。随着收割高度的增加,构树产量、中性洗涤纤维、酸性洗涤纤维、木质素均显著增加(P<0.05),粗蛋白含量、干物质与纤维消化率显著降低(P<0.05)。随着留茬高度的增加,杂交构树的粗蛋白含量、干物质与纤维消化率显著升高(P<0.05),产量、纤维素木质素含量显著下降(P<0.05)。研究表明:增加收割高度可增加产量,提高经济效益;增加留茬高度可提高构树饲料品质。为保证杂交构树饲料品质并兼顾产量,在株高140 cm时留茬40 cm收割较为合适。

The experiment studied the effect of different harvesting heights and stubble heights on the biological yield,nutrient composition and digestibility of hybrid Broussonetia papyrifera,different harvesting heights(100,120,140,160 cm)and different stubble heights(20,30,40 cm)were set in the experiment,and the yield was calculated and the nutrient composition and digestibility were determined after harvest.The results showed that the yield,nutrient composition and digestibility of hybrid Broussonetia papyrifera were influenced by the height of harvesting and stubble.With the increase of harvesting height,the yield,neutral washing fiber,acid washing fiber,lignin and crude protein content,dry matter and fiber digestibility decreased significantly(P<0.05).With the increase of stubble height,the crude protein content,dry matter and fiber digestibility of hybrid Broussonetia papyrifera increased significantly(P<0.05),and the yield and cellulose lignin content decreased(P<0.05).Increasing the harvesting height can increase the yield,improve the economic benefit,and increase the stubble height can improve the feed quality of Broussonetia papyrifera.In order to ensure the feed quality and yield of hybrid Broussonetia papyrifera.It is more appropriate to harvest the stubble 40 cm when the plant height is 140 cm.