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Nitrogen Dioxide Production From Silage. II. Detailed Field Survey¹

Synopsis: During a 5-year period (1957–1961), the presence of NO₂ gas produced from corn silage in concentrations considered hazardous was observed on 42% of 554 Minnesota farms. The highest incidence of positive samples occurred during a drought year, 1959 (78%), and the following year (55%). Temperature and rainfall variables were associated with the production of NO₂ gas as were certain soil properties including texture, organic matter, available phosphorus, and potassium.

² Associate Professor, Department of Animal Husbandry, present address: Department of Microbiology, University of New Mexico, Albuquerque.

³ Professor, Department of Dairy Industries, and Associate Professor, Agricultural Experiment Station, Institute of Agriculture.

⁴ Professor, School of Public Health, and Project Director, Studies of Human Poisoning by Silo Gas. The authors acknowledge the assistance of John Grava, Soil Testing Laboratory, for the soil analyses.