不同封装密度对胡萝卜苗青贮品质的影响

为了探讨不同封装密度对胡萝卜苗青贮发酵品质、养分及氨态氮含量的影响,以高（486.0 kg/m3）、中（428.4 kg/m3）、低（300.3 kg/m3）3种封装密度桶装密封青贮胡萝卜苗,青贮330 d后取样进行分析。结果表明,低密度胡萝卜苗青贮与高密度胡萝卜苗青贮相比,其p H值和氨态氮含量都显著降低（P〈0.05）;且低密度组胡萝卜苗青贮粗蛋白含量高于其他2组。从胡萝卜苗青贮发酵品质、养分及氨态氮含量综合评定,胡萝卜苗青贮的最佳封装密度应选在低密度（300.3 kg/m3左右）。

Effect of Different Packaging Density on the Fermentation Quality of Daucus carota Seedings Silage

This study was conducted to investigate the effect of different packaging density on the quality, nutrient content and ammonia nitrogen content of Daucus carota seedings fermented silage. The Daucus carota seedings were packaged to ferment with high density （486.0 kg/m3）, moderated density （428.4 kg/m3） and low density （300.3 kg/m3）, respectively. After 330 d fermentation, the samples were collected and tested. While pH value and ammonia nitrogen content of Daucus carota seedings silage fermented with low packaging density were significantly lower than those of silage fermented with high packaging density （P〈0.05）, the crude protein content of silage fermented with low packaging density was higher than that of silage fermented with high and moderate packaging density. Based on the of comprehensive evaluation of fermentation quality, nutrient content and ammonia nitrogen content, the 300.3 kg/m3 was recommended as preferred packaging density of Daucus carota seedings fermented silage.