不同刈割期对多花黑麦草饲草产量及品质的影响

为探讨不同刈割时间对多花黑麦草饲草产量及品质的影响,以自选品系和育成品种为材料,采用2种不同的刈割方案分别测定不同品种的饲草产量,粗蛋白、可溶性碳水化合物(WSC)、酸性洗涤纤维(ADF)、中性洗涤纤维(NDF)含量以及干物质体外消化率(IVDMD)。结果表明,同4月1日开始刈割相比较,4月16日开始刈割单位面积饲草总产量极显著增加(P＜0.01),不同品种单位面积干物质产量提高16.0%～50.2%。相同刈割茬次的饲草品质相比较,饲草中粗蛋白含量以早刈割高于晚刈割,单位面积粗蛋白产量存在品种差异;WSC、ADF、NDF的含量均以早刈割的低于晚刈割。饲草干物质体外消化率总的变化趋势趋于一致,第1次刈割＞第2次刈割＞第3次刈割。在不同刈割方案中以4月1日开始刈割的各刈割茬次饲草IVDMD均高于4月16日开始刈割。综合考虑饲草产量和品质,适当推迟首次刈割时间有利于提高单位面积饲草产量和可消化干物质产量。

Effect of cutting time on the biomass production and forage quality of Lolium multiflorum

In order to investigate the effect of cutting time on the yield and forage quality of Lolium multiflorum,seven varieties,one selected line and two cutting strategies were applied.The forage yield,the content of crude protein(CP),water-soluble carbohydrate(WSC),acid-detergent fiber(ADF),neutral-detergent fiber(NDF),and in vitro dry matter digestibility(IVDMD) were measured.Compared with cutting begun from April 1st,the dry matter yield of cutting begun from April 16 increased remarkable(P<0.01).Dry matter yield increased range from 16.0% to 50.2% with different varieties.Compared with different cutting strategies,the concentration of forage CP and WSC of the early cutting is higher than that of later cutting between the same cutting time(1st,2nd,or 3rd),but the concentration of ADF and NDF of the later cutting is higher than the early cutting between the same cutting time.The CP yields per unit area changed between two cutting strategies depending on varieties.The IVDMD of different varieties followed the same trend: 1st cutting>2nd cutting>3rd cutting.Between different cutting strategies,the IVDMD of early cutting is higher than the later cutting between the same cutting time(1st,2nd,or 3rd).Considered the forage yield and quality,delaying cutting time properly can remarkably increase forage yield and digestible dry matter yield per unit area.