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1617. Doran, J., D. Fraser, M. Culik, and W. Liebhardt. 1987. Influence of alternative and conventional agricultural management on soil microbial processes and nitrogen availability.. Am. J. Alternative Agriculture 2:99-106.
Differences in soil biological factors between management systems (conventional cash grain; legume/cash grain; grain/forage plus manure) were related primarily to crop characteristics and, to a lesser extent, to soil physical properties. The use of ag chemicals had little effect on microbial populations, their activities, or the cycling of N. Competitiveness of alternative systems employing legumes as N sources for grain crops may depend largely on the grower's ability to synchronize supplies of available soil N with periods of maximum uptake by grain crops.