碳酸钾与乳酸菌对柱花草青贮品质的影响

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中图分类号：S816.53 文献标识码：A 文章编号：1007-0435（2025）08-2737-08

Abstract：This experiment was conducted to investigate the efects of adding lactic acid bacteria （LAB）on nutrient composition，fermentation quality and microbial populations of stylo（Stylosanthes guianensis） silage treated with potassium carbonate solutions.Stylo treated with potassium carbonate at diferent concentrations （0% ， 1.5% ， 2.0% ，and 2.5% ）were used as raw materials. Two groups were set up： one with adding lactic acid bacteria（（LAB group）and the other with adding an equal volume of sterile water as the control group （CK group）.After 6O days of ensiling，samples were taken，and the nutritional components，fermentation quality， and microbial counts of the stylo silage were measured. The results indicated that spraying potassium carbonate significantly increased the counts of LAB and aerobic bacteria in the silage （ P<0.05） ，but significantly decreased their water-soluble carbohydrates content （ P<0.05' .The addition of LAB significantly increased the lactic acid content in silage and reduced the pH value of the system （ P<0.05） .However，the ammonia nitrogen content decreased significantly only in the group treated with 2.5% potassium carbonate solutions （ P< O.05），and there was an increasing trend in butyric acid content across diferent potassium carbonate levels. Furthermore，the addition of LAB significantly increased the count of LAB in silage （ ⋅P<0.05 ）and significantly decreased the water-soluble carbohydrate content （ （P<0.05） . In summary，spraying potassium carbon ate of different concentrations and adding LAB could improve the nutritional value of silage to a certain extent. Therefore， it is recommended to consider adding LAB when preparing semi-dry stylo silage.

Key words：Stylosanthes guianensis;Semi-dry silage;Potassium carbonate;Lactic acid bacteria;Silage quality

柱花草（Stylosanthes guianensis），亦称巴西苜蓿，凭借其丰富的营养价值、高蛋白质含量及全面的氨基酸组成，已成为我国南方地区不可或缺的优质豆科牧草资源，对推动当地畜牧业发展具有重要意义[1]。（剩余12930字）