维多利亚紫花苜蓿在贵阳不同海拔地区的产量与营养成分含量研究

试验在贵阳市的4个不同海拔地区（950、1120、1210、1350m）设点，对维多利亚紫花苜蓿的生长、产量、营养成分进行了测定。结果表明：维多利亚紫花苜蓿秋季种植后141d可以第一次刈割，平均产量为1307．32kg。其生长速度与海拔高度呈负相关，海拔高度每升高100m，株高达到50cm的时间推迟5天，667m^2产量降低50kg。第一次刈割后66d株高达到50cm，平均产量为2304．5k。第二茬生长速度与海拔高度呈负相关，海拔高度每升高100m，株高达50cm的时间推迟4天，产量降低30kg左右。第三茬株高达到50cm的时间平均为74．5d，平均产量为2588．0kg，海拔高度每升高100m，植高达到50cm的时间推迟3天，产量变化不明显。在贵阳地区当年种植可以刈割3茬，利用时间282d，平均每茬产草量平均为2066．6kg／667m^2，年总产草量6199．8kg／667m^2；鲜草含水量平均为70．9％，干物质含量平均为29．1％，干物质中平均含CP26．3％、EE5．2％、CF25．9％、Ash9．6％、NFE33．0％、NDF36．1％、ADF32．6％、Ca1．7％、P0．8％、GE18．4MJ／k。

Determination of the Yild and Nutritional Compoment Contents in Victoria Alfalfa from Different Altitude Area of Guiyang

The experimental site was located at four different altitude areas（950,1 120,1 210,1 350m） in Gujyang, we investigated the growth,yield and nutritional components of victoria alfalfa, the result indicated that victoria alfalfa can be harvested after 141 d, and the arverage yield was 1 307.32 kg, there was a negative correlation between the growth rate and altitude, the altitude increase 100m cause the yield of alfalfa reduce 50kg, and the height got to 50cm delay 5 d; the height of alfalfa was 50 cm after 66d of the frist harvest, the arverage yield was 2 304.5 kg, there was a negative correlation between the growth rate of the second harvest and altitude, the height got to 50 cm delay 5 d with the altitude increase 100 m,and the arverage yield was 2 588.0 kg,the height of the third harvest got to 50 cm delay 3 d, the third harvest yield was near the second harvest; victoria alfalfa could be harvest 3 times in 282 d of the frist year in guiyang, the arverage yield of arverage harvest in 3 times was 2 066.6 kg/mu, the total yield of one year was 6 199.8kg/667m^2 ,the arverage water content of thegrass was 70.9%, the arverage dry matter was 29.1%, the content of dry matter was respectively CP26.3% ,EES. 2% ,CF25.9% ,Ash 9.6% ,NFE 33.0% .NDF 36.1% ,ADF 32.6% ,Ca 1.7% ,P 0. 8% and GE 18.4MJ/kg.