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2974. International Atomic Energy Agency and UN Food and Agriculture Organization. 1968. Isotopes and radiation in soil organic matter studies.. Proceedings series, IAEA, Vienna, 584pp..
See especially: Effects of microorganisms on the absorption of inorganic nutrients by plants. p.365. Availability of nitrogen on changes in the humus quality in biochemical threshold range of soils. p.515. T; many.

4176. McCalla, T.M.. 1945. Influence of microorganisms and some organic substances on soil structure.. Soil Sci., 59(4):287-297.

7085. Vandecaveye, S.C. and B.R. Villanueva. 1934. Microbial activities in soil: I. N fixation by Azotobacters and activity of various groups of microbes in Palouse silt loam.. Soil Science, 38(3):191-205.
N fixation for 3 Palouse soils treated with lime & manure was determined. Quantities of N fixed varied with OM of soil. Unmanured soil with lime fixed 62 lb N per 2 million lb dry soil while manured soil with lime fixed 694 lb. during N fixation, the total N, N/C ratio, or the amount of nitrate present did not effect activity of azobacters. Transformation of organic residue was associated with a distinct sequence in developement of important groups of soil microbes through which the process of non-symbiotic aerobic N fixation is directly affected. T: N fixing powers of manured and unmanured Palouse silt loams. Microbial developement and CO2 production in manured Palouse silt loam. Microbial developement and CO2 production in virgin Palouse silt loam. Relation of N to fixed N and OM content of variously treated Palouse silt loams.

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