Abstract: The pectin residue was used as an additive for corn stalk silage, the changes of pH value, the loss rate of dry matter, volatile fatty acid content, water-soluble carbohydrates content and cellulose content were taken as evaluation indexes to analysis the silage effect, and hope to search a new additive for corn straw silage. The results showed that the addition of pectin residue had a good effect on corn straw silage. It can quickly reduce the pH value in storage process, and the minimum pH value reaches 3.97, improve the content of water-soluble carbohydrates and provide sufficient raw materials for the rapid propagation of lactic acid bacteria, reduce the amount of acetic acid and reduce the possibility of corruption in storage process, reduce dry matter loss during storage.

Key words: corn silage, additives, pectin slag, fermentation quality