[On the importance of nitrate content in green forage for the feeding value of silage]

abbau ammonia ammoniac ammoniak biodegradation butyric fermentation ensilado ensilage (produit) feed crops fermentation fermentation butyrique nitrat nitrate nitrates nitratos nitrit nitrite nitrites nitritos nutritive value plantas forrajeras silage stickstoffmonoxid valeur nutritive valor nutritivo wassergehalt