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Soil Biology & Biochemistry
Nitrogen Transformations and Microbial Communities in Soil Aggregates from Three Tillage Systems Subathra Muruganandam Dep. of Soil Science North Carolina State Univ. Raleigh, NC 27695
Daniel W. Israel* USDA-ARS Dep. of Soil Science North Carolina State Univ. Raleigh, NC 27695
Wayne P. Robarge Dep. of Soil Science North Carolina State Univ. Raleigh, NC 27695
Quantifying N transformation processes in soil aggregates is relevant since microbial communities central to the N cycle may differ among aggregate size fractions. Our objective was to test the hypothesis that variations in microbial community composition of aggregate size fractions influence N transformation rates of soil from three long-term (22-yr) tillage systems (no-till, chisel plow, and moldboard plow). Aggregate size fractions (2–4, 0.5–1, and
