Modified Laboratory Silo Unit for Studying the Fermentation of Corn (Zea mays L.) Grain
1973
Danley, Michael M. | Vetter, R. L. (Richard L.) | Wedin, W. F.
Four experiments were conducted to evaulate a modified laboratory silo apparatus. The design of the laboratory system is such that the effects of light, temperature, and pressure on fermentation can be studied simultaneously or independently. Temperature within the thermostatically controlled cabinet varied 0.5 with no cooling mechanism, regardless of temperature setting. Air pressure was maintained with a 4.32 g/cm² differential. Evolved carbon dioxide and nitrogen gases from fermentation were flushed into absorption bottles by a circulating-gas system, eliminating the complex syphon system used in the previously reported Minnesota silo unit. Carbon dioxide evolution was directly related to dry matter and nitrogen loss in all experiments (r = .83 and r = .84, respectively). A direct relationship also existed between dry matter and nitrogen loss (r = .73). Large losses of dry matter and nitrogen occurred when reconstituted shelled corn (Zea mays L.) was ensiled under aerobic conditions. Formic acid significantly (P<.05) reduced dry matter, total nitrogen, and gaseous losses.
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