English to Spanish Tech/Engineering Agriculture Farming

Hola:

Otra duda en un texto sobre la producción de un buen forraje:

"Crop contamination from soil is one of the most eminent problems for the quality of grass silages. In order to avoid poor fermentation and reduced feed values, producing forage with as little incorporated soil as possible is crucial.
High soil content:
- Deteriorates the ensilability due to an increased **buffering capacity**."

No encuentro qué puede ser este "buffering capacity". ¡Gracias de antemano!
Rosa