不同刈割时间对机播苜蓿产量、营养成分及饲用价值的影响  

The effects of different cutting times on the yield,nutritional components,and feeding value of machine sown alfalfa

作　　者：屈怀芝 刘桂萍 李元超 QU Huaizhi;LIU Guiping;LI Yuanchao(People's Government of Liuyu Town,Pingyi County,Shandong Province 273300,China;People's Government of Zhongcun Town,Pingyi County,Shandong Province 273300,China;Agriculture and Rural Bureau,Pingyi County,Shandong Province 273300,China)

机构地区：[1]平邑县流峪镇人民政府,山东平邑273300 [2]平邑县仲村镇人民政府,山东平邑273300 [3]平邑县农业农村局,山东平邑273300

出　　处：《中国饲料》2024年第12期89-92,共4页China Feed

基　　金：2022年中央财政农业生产发展项目(SDGP3713260002022000232A-001);临沂市科协课题(2023kxy277)。

摘　　要：文章旨在研究不同刈割时间对机播苜蓿产量、营养成分及饲用价值的影响。全年从初花期开始,间隔相同时间共刈割4次(第1~4茬),每次选取5个重复小区测量鲜干重,计算机播苜蓿产量,并烘干采集小样后测量营养成分和饲用价值。结果表明:(1)与第1茬相比,第3、4茬机播苜蓿的株高降低了7.48%、8.01%(P<0.05);第2、3、4茬机播苜蓿的鲜重降低了24.57%、45.15%、51.42%(P<0.05);第2、3、4茬机播苜蓿的干重降低了26.33%、44.09%、51.16%(P<0.05)。(2)与第2茬相比,第3、4茬机播苜蓿的粗蛋白质、粗脂肪含量显著降低(P<0.05),中性洗涤纤维含量显著升高(P<0.05)。(3)与第2茬相比,第3、4茬机播苜蓿的DMI、RFV显著降低(P<0.05)。结论:随着刈割时间的推移,机播苜蓿的产量逐渐减少,而营养成分和饲用价值先上升后下降,其中第1茬机播苜蓿的产量最高,第2茬机播苜蓿的饲用价值最高。This experiment aims to investigate the effects of different cutting times on the yield,nutritional components,and feeding value of machine sown alfalfa.Starting from the early flowering period throughout the year,a total of 4 harvests(1st to 4th crop)were cut at the same time interval.Each time,5 repeated plots were selected to measure fresh and dry weight,calculate the alfalfa yield,and dry the collected samples before measuring the nutritional composition and feeding value.The results showed that:(1)Compared with the first crop,the plant height of machine sown alfalfa in the third and fourth crops decreased by 7.48%and 8.01%(P<0.05);The fresh weight of the second,third,and fourth crop of machine sown alfalfa decreased by 24.57%,45.15%,and 51.42%(P<0.05);The dry weight of the second,third,and fourth crop of machine sown alfalfa decreased by 26.33%,44.09%,and 51.16%(P<0.05).(2)Compared with the second crop,the crude protein and crude fat content of machine sown alfalfa in the third and fourth crop were significantly reduced(P<0.05),while the neutral detergent fiber content was significantly increased(P<0.05).(3)Compared with the second crop,the DMI and RFV of machine sown alfalfa in the third and fourth crop were significantly reduced(P<0.05).Conclusion:With the passage of cutting time,the yield of machine sown alfalfa gradually decreases,while the nutritional content and feeding value first increase and then decrease.Among them,the first crop of machine sown alfalfa has the highest yield,and the second crop of machine sown alfalfa has the highest feeding value.

关 键 词：刈割时间 机播苜蓿 产量 营养成分 饲用价值 

分 类 号：S816.5[农业科学—饲料科学]