关键词: 马铃薯秧;混合青贮;发酵品质;营养成分;龙葵素

Abstract: [Objective]To explore the feasibility of preparation of silage with potato seedlings and to screen the suitable silage methods for potato seedlings.[Methods]The fresh potato seedlings and whole-plant corn were used as materials to prepare mixed silage in this experiment.When mixed with the whole-plant corn,five addition levels of potato seedlings were set,including 10%,20%,30%,40% and 50%.For each addition proportion of potato seedlings,there were three treatment groups,including a control group received no additives and two experimental groups adding cellulase and lactobacillus respectively.Ten replicates were included for each treatment group.Sensory evaluation and fermentation index determination of the mixed silage product were carried out after a 45-day-long fermentation.[Results]The pH value of the mixed silage product was lower than 4.2 when the addition proportion of potato seedlings was 10%-50%,indicating that the mixed silage product prepared with potato seedlings could not only be successfully stored,but also reached an excellent level in quality.Under the same treatment conditions,when the addition proportion of potato seedlings was 10%,30% and 50%,the content of ammonia nitrogen of the mixed silage product was elevated with the increase of the addition proportion of potato seedlings.Between the control groups at 10%,30%and 50%addition levels of potato seedlings,there was no significant differences in crude protein content in the mixed silage product(P>0.05),and the highest value(10.62%)was observed in the control group at 30% addition level of potato seedlings.When the potato seedlings addition proportion ranged from 10%to 40%,an increasing trend in crude protein content was observed with the elevation of potato seedlings addition proportion in the lactobacillus adding groups.Under the same treatment condition,the mixed silage product prepared with 20% addition level of potato seedlings had relatively lower neutral detergent fiber content,and that prepared with 50% addition level of potato seedlings had the highest neutral detergent fiber content.The content of acid detergent fiber was increased with the increase of addition proportion of potato seedlings,and the highest value was observed in the control group and cellulase adding group at 50% addition level of potato seedlings.[Conclusions]The potato seedling cut before defrosting can be used to prepare mixed silage with whole-plant corn.When the addition levels of potato seedlings range from 20% to 40%,the mixed silage product has better fermentation quality.Furthermore,the adding of lactobacillus helps to promote the fermentation and improves the quality and palatability of silage in practice.