. The chemistry of plant and animal life. Agricultural chemistry. 66 AGRICULTURAL CHEMISTRY stantly undergoing decay, some ammonia is always in the air. The ammonia gas unites with the carbon dioxid and forms ammonium carbonate. In barns and stables where the ventilation is poor, abnormal amounts of carbon dioxid and ammonia are formed from the respiration and waste products of animals. When carbon dioxid forms to such an extent that it produces a white coating upon stones and boards, it shows enough ammonium carbonate to be injurious to animals. Nitrogen, in traces, in the form of ammonium ni
. The chemistry of plant and animal life. Agricultural chemistry. 66 AGRICULTURAL CHEMISTRY stantly undergoing decay, some ammonia is always in the air. The ammonia gas unites with the carbon dioxid and forms ammonium carbonate. In barns and stables where the ventilation is poor, abnormal amounts of carbon dioxid and ammonia are formed from the respiration and waste products of animals. When carbon dioxid forms to such an extent that it produces a white coating upon stones and boards, it shows enough ammonium carbonate to be injurious to animals. Nitrogen, in traces, in the form of ammonium nitrate and nitrite, is also present in the air. The amount of combined nitrogenous com- pounds in the air is small and not sufficient to furnish food for plants. 70. Moisture. — The amount of moisture in the air ranges between wide limits, from com- plete saturation to desert con- ditions. When the air contains all the moisture it can hold, it is said to be saturated. In temperate climates, the humidity, or per cent of saturation, ranges be- tween 60 and 85. The amount of moisture in the air has an influence upon plant growth, rather because it modifies the conditions of the atmosphere than because it furnishes moisture directly to plants. The humidity of the air also influences many farm operations, as the. Fig. 37. — Ventilating flue in chim ney for removing foul Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Snyder, Harry, 1867-1927. New York, The Macmillan company
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