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为了解决生产中由于留茬高度不当造成苜蓿再生干草产量、品质及翌年返青率较低的问题,试验选择“金皇后”紫花苜蓿,测定分析不同留茬高度处理对苜蓿再生干草产量、品质及翌年返青率的影响,以确定最适留茬高度。结果表明:随着留茬高度的增加,苜蓿干草产量呈降低趋势;留茬≥8~<11 cm时,苜蓿再生干草粗蛋白含量、相对饲用价值较高,分别为20.79%、147.24%,其次为留茬≥5~<8 cm,两者间粗蛋白含量、相对饲用价值差异不显著(P>0.05);留茬≥8~<11 cm时,苜蓿根内可溶性糖含量为89.41 mg/g,翌年返青率为79.89%,显著高于其他处理(P<0.05)。说明凌海地区第一、二、三茬苜蓿以留茬高度≥5~<8 cm为宜,但第四茬苜蓿应留茬≥8~<11 cm。
In order to solve the problem of alfalfa hay yield and quality as well as low rejuvenation rate of the following year due to the stubble height improper in production, the experiment chose “Golden Queen” and “alfalfa” to test the effects of different stubble heights on the yield and quality of alfalfa hay And the impact of the rate of greening the following year to determine the optimal stubble height. The results showed that the hay yield of alfalfa decreased with the increase of stubble height. The crude protein content and the relative feeding value of alfalfa hay were 20.79% and 147.24% Followed by stubble ≥5 ~ <8 cm, the difference of crude protein content and relative feed value was not significant (P> 0.05); when the stubble was ≥8 ~ <11 cm, the content of soluble sugar in root of alfalfa was 89.41 mg / g, the following year rejuvenation rate was 79.89%, significantly higher than other treatments (P <0.05). The results showed that the first, second and third crop of alfalfa in Linghai area should be ≥5 ~ <8 cm in stubble height, but the fourth crop should be stubble ≥8 ~ <11 cm in alfalfa.