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The author of this article marks that to introduce a variety of chemical and biological preservatives different dosing pumps are used, drugs are pre-diluted or dissolved in water. Since working with acids is associated with a certain risk, the countries of Europe, where the majority of forage is harvested by silage, switched to the dry form of preservative. In Russia, the introduction of dry preservative is constrained due to lack of technical means to introduce them. For this reason, cheap preservatives, such as sulfur powder, application it is not widely known. To solve this problem we created a contact device for metered introduction of powdered preservative.