In a paper read at the meeting last year it was pointed out that when a soluble form of organic matter was added to soils which were incubated in tumblers, a considerable quantity of nitrate nitrogen could be used by the micro-organisms of the soil. The amount of nitrate nitrogen assimilated was in a measure determined by the amount of nitrate present at the beginning, the form and amount of organic matter used, and the length of incubation period. Two percent of straw furnished sufficient carbon for the assimilation of 10 mgm. per 100 gms. of soil in one week, and for about 15 mgm. in 3 weeks. Two percent of soluble starch or dextrose permitted the assimilation of about 15 mgm. in 1 week.
Proceedings of the Iowa Academy of Science
©1930 Iowa Academy of Science, Inc.
Pendleton, Ray A. and Smith, Frederick B.
"Further Studies on the Nitrate Assimilating Power of Soils,"
Proceedings of the Iowa Academy of Science, 37(1), 65-69.
Available at: https://scholarworks.uni.edu/pias/vol37/iss1/10