— Comparative studies were made at a laboratory level to assess the effectiveness of the treatment of straw with anhydrous ammonia (anhydrous NH 3 ) and urea. The influence of moisture, dosage, and temperature were also assessed. The influence of the addition of an urease source was studied in treatments with urea. Two experiments were performed: 1), Anhydrous-NH 3 and urea were used separately to treat a total of 13 samples of barley straw. Anhydrous NH 3 was d'uréase. Dans l'expérience 1, on

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... observé que l'augmentation de l'humidité dans le traitement à l'ammoniac réduisait la teneur en NDF (fibre neutre détergente), mais qu'elle ne modifiait pas les valeurs de la Present address: IRTA,