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Effects of conversion to organic agricultural practices on soil biota

Published online by Cambridge University Press:  30 October 2009

Matthew R. Werner  and
Daniel L. Dindal
Matthew R. Werner
Affiliation:
Soil Ecologist, Agroecology Program, University of California, Santa Cruz, CA 95064.
Daniel L. Dindal
Affiliation:
Professor, Department of Environmental and Forest Biology, SUNY, College of Environmental Science and Forestry, Syracuse, NY 13210.
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Abstract

In the fifth year of an agricultural conversion experiment in Pennsylvania, we studied the soil biological community under three treatment regimes planted with corn: organic-manure, organic-legume, and a conventional system. The organic treatments consisted of complex crop rotations, cultivations, and organic matter inputs to control pests and maintain soil fertility. The conventional system consisted of a simple corn/soybean rotation with synthetic fertilizer and pesticide inputs. High rates of CO2 evolution (a measure of potential microbial activity) in the organic plots corresponded with high levels of organic matter input. Soil nematodes were most abundant in organic plots, although seasonal patterns differed between the two organic treatments. Soil microarthropods were dominated by fungivorous Prostigmata mites, which reached peak abundance in organic plots two to five months after organic matter incorporation. Oribatid mites, which were rare throughout the study, followed the same pattern of abundance in each treatment and were probably most influenced by tillage disturbances. Predatory Mesostigmata were generally more abundant in organic plots. Surface-dwelling Collembola were abundant briefly in the spring, but soil-dwelling species dominated numerically throughout the cropping season. Spring tillage appeared to have a strong negative effect on earthworm populations in all plots. Small earthworm species became abundant in organic-manure plots during the summer. Larger earthworm species were abundant in organic-legume and conventional plots after the autumn harvest, when crop residues covered the undisturbed soil The systems-level nature of the Conversion Project experiment makes it difficult to identify cause-effect relationships. The data do suggest that organic amendments tend to enhance soil biological activity, while tillage disturbances tend to disrupt the biotic community.

Keywords

organic soil amendmentstillagesoil respirationnematodesmicroarthropodscollembolamitesearthworms
Type
Articles
Information
American Journal of Alternative Agriculture , Volume 5 , Issue 1 , March 1990 , pp. 24 - 32
Copyright
Copyright © Cambridge University Press 1990

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