Buffered Propionic Acid
Buffered Propionic acid is the most popular type of preservative used on hay between 16% and 30% moisture. While other acids can be used to preserve hay, propionic is the most effective in controlling the molds commonly found in hay. Un-buffered acid has a pH of less than 1 and is therefore very corrosive. The buffering process can raise the pH to 6, the same as rain water, and is much easier to use than straight acid. However, in raising the pH, careful manufacturing procedures must be followed to prevent neutralizing the propionic acid making it much less effective. A truly reacted buffered propionic acid will keep the effectiveness of straight acid and that is what makes AGCO Buffered Acid effective on hay up to 30% moisture.

Application Rates – Large Square Bales

Hay Moisture Stem Moisture Dew Moisture Only
Under 22% 6 lbs/ton 3 lbs/ton
23% – 26% 10 lbs/ton 8 lbs/ton
27% – 30% DO NOT BALE 16 lbs/ton

Application Rates – Small Square & Round Bales

Hay Moisture Stem Moisture Dew Moisture Only
Under 22% 4 lbs/ton 2 lbs/ton
23% – 26% 8 lbs/ton 6 lbs/ton
27% – 30% 16 lbs/ton 12 lbs/ton

Not recommended on any hay above 30% moisture.