收割高度对不同类型玉米饲用品质和产量的影响

在大田条件下分别对农大108和科多4号不同收割始节位(基部第1～8节间)的整株饲用品质和产量变化研究表明：随着收割始节位升高，两品种秸秆CP含量均呈直线增加趋势，NDF、ADF和ADL均呈直线下降趋势；随着收割高度的增加两品种之间的CP含量提高速率及ADL下降速率相近，科多4号的NDF下降速度快于农大108，农大108的ADF下降速率快于科多4号；玉米基部3个节间CP含量低，NDF、ADF和ADL含量高，饲用营养品质差；从第4节间收割明显改善玉米秸秆的饲用营养品质，其干物质产量损失10%以下。

The Cutting Height Effect Forage Quality and Yield on Different Types of Maize

In the field condition, it respectively researched nongda108 and keduo4(under first to eighth) of the different cutting heights of forage nutrition quality and yield. The research showed that with the cutting height raising, CP content of the two breed straw improved, NDF, ADF and ADL presented straight-line drop trend; With the cutting height raising, the breed between CP content increased velocity and ADL decreased velocity was similar, keduo4 of NDF decreased velocity was quick than nongda108, nongda108 of ADF decreased velocity is high than keduo4; the under three node interval of CP content is low, NDF, ADF and ADL content are high, forage nutrition quality is bad; from the fourth harvest obviously improved forage nutrition quality of maize straw, the dry matter yield was loss percent of ten.