刈割方式对饲草玉米SAUMZ1产量和饲用品质的影响

Effects of Clipping Style on Forage Yield and Quality of Forage Maize SAUMZ1

采用大田小区栽培,研究了不同留茬高度和刈割时草长对饲草玉米SAUMZ1(以下简称饲草玉米)产量和饲用品质的影响。结果表明,留茬25 cm的处理与留茬15 cm处理的总鲜草产量、总干草产量、相对饲用价值(RFV)、粗蛋白(CP)含量及CP总产量差异均不显著,但均显著高于留茬5 cm处理。处理C220(草长220 cm时刈割)的鲜草产量、干草产量和CP产量均显著高于处理C190(草长190 cm时刈割),但CP含量和RFV较低,中性洗涤纤维(NDF)含量较高。处理C160(草长160 cm时刈割)的鲜、干草产量和CP产量均显著低于对照处理,但CP含量和RFV较高。研究表明,留茬25 cm、草长190 cm刈割适用于青饲;留茬15 cm、草长220 cm刈割适用于青贮。

A field plot experiment is conducted to study the effects of stubble height and clipped grass length on yield and quality of forage maize SAUMZ1. The results indicates that there is no significant difference between the treatment of 25 cm stubble and treatment L15 on total fresh yield, dry yield, RFV and crude protein （CP） content and CP production, but it is significantly higher than the treatment of 5 cm stubble. The treatment C220 （clipping when grass length is 220 cm） is higher in fresh yield, dry yield, CP production and neutral detergent fiber （NDF） content and lower in RFV and CP content when it is with treatment C190 （clipping when grass length is 190 cm）. The fresh, dry forage yield and CP production of treatment C160 （clipping when grass length is 160 cm） is significantly lower than treatment C190, but higher in CP concentration and RFV. Considering forage yield and quality in different clipping mode, the study indicates that for fresh feeding, stubble height is 25 cm and grass length is 190 cm; for silage, stubble height is 15 cm and grass length is 220 cm.