乙酸钾对紫花苜蓿干燥速度和营养品质的影响

Effect of potassium acetate of different concentrations on drying speed and nutrient quality of alfalfa

对刈割后初花期紫花苜蓿Medicago sativa分别喷洒不同质量分数乙酸钾(CK:0、C1:0.5%、C2:1%、C3:1.5%、C4:2%、C5:2.5%、C6:3%),测定其水分含量变化和干燥后粗蛋白(CP)、中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)及能量(GE)含量的变化。结果表明:喷洒不同质量分数的乙酸钾可以提高紫花苜蓿的干燥速度,并改善其干草营养品质。除C6外,其余各处理组间紫花苜蓿的CP含量差异不显著(P>0.05),其中C2组CP含量最高(19.24%);C2组NDF含量(36.2%)显著低于其他各处理组(P<0.05);除C6外,其他各处理组的ADF含量显著的低于CK(P<0.05);CK处理GE含量显著的低于其余各处理(P<0.05),其中C2组GE含量最高(17 801.67 J/g)。综合考虑,7个处理组中以C2处理组的干燥效果最好,能有效地改善紫花苜蓿干草品质。

Content of water,crude protein（CP）,neutral detergent fiber（NDF）,acid detergent fiber（ADF）,general energy（GE） of alfalfa were measured after drying,A various concentration of potassium acetate（CK：0,C1：0.5%,C2：1%,C3：1.5%,C4：2%,C5：2.5%,C6：3%） was sprayed on these plants in early flowering.The results showed potassium acetate increased the drying rate and improve the nutritional quality,as decreasing ADF（P〈0.05） and increasing GE（P〈0.05） except C6.C2 was considered as the best treatment since it increased CP to highest,and decreased NDF to lowest（P〈0.05）.