饲用小黑麦适宜刈割时期及刈割次数研究

Studyon the appropriate harvest date and cuttingtimes of forage triticale

河北低平原区以中饲828和NTH1048饲用小黑麦为材料,研究了不同刈割时期及刈割次数对其生长发育,饲用品质及产草量的影响,测定分析了不同生育天数内株高、干物质积累量、鲜干比、茎叶比、茎数、粗蛋白含量及二茬草的产草量等性状指标。结果表明:饲用小黑麦的株高、干物质积累量、粗蛋白产量的变化趋势符合Logistic生长模型,鲜干比呈递增趋势,茎数、粗蛋白含量呈下降趋势,符合一元线性回归模型,鲜草产量、茎叶比呈现先升高后降低的趋势,符合二次曲线回归模型。综合分析得出,饲用小黑麦1次刈割应在抽穗初期至抽穗期进行,且1次刈割产草量最高为48 119kg/hm2,优于2次刈割产草量,如春季进行多次刈割时,每次刈割应在拔节期以前完成。

The effect of cutting date and times on forage yield of forage triticale was studied by using Zhong-si-828 and NTH1048 in low plains of Hebei.The plant height,dry matter accumulation,ratio of fresh to dry and stem to leaf,tiller number,crude protein and forage yield were measured.The results indicated that the change of plant height,dry matter accumulation and crude protein yield showed a logistic growth model.The ratio of dry to fresh matter showed an increasing trend,however,the number of stems and crude protein content decreased,which fitted the linear regression model.Fresh yield and ratio of stem to leaf were firstly increased and then decreased.It suggested that cutting once was the best and it should be between early heading and heading stage.Each cutting should be carried out before jointing stage if more than one cutting.