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Research ArticleResearch

Soil quality indicator properties in mid-Atlantic soils as influenced by conservation management

K. R. Islam and R. R. Weil
Journal of Soil and Water Conservation January 2000, 55 (1) 69-78;
K. R. Islam
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R. R. Weil
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ABSTRACT:

Soil quality or condition is best assessed by soil properties that are neither so permanent as to be insensitive to management, nor so easily changeable as to give little indication of long-term alterations. Thirteen such intermediate properties were evaluated for potential inclusion in a soil quality index by comparing soils under contrasting management system from long-term replicated field experiments and from paired field sites. Conservation (v. conventional) management was defined as some combination of reduced tillage, increased crop diversity more perennial crops, increased crop residue return, increased soil fertility and/or increased application of organic amendments. Conservation management most consistently and markedly influenced soil quality indicator properties by increasing total and active microbial biomass carbon (GTMB and CAMB, increasing the ratio of active microbial biomass carbon to total organic carbon (CAMB/CORG), increasing aggregation and decreasing the rate of basal respiration per unit of microbial biomass carbon (qCO2) . The qCO2 increased exponentially as CTMB decreased. This may indicate reduced stress on soil microbial communities under conservation management and high microbial populations.

Footnotes

  • Khandakar R. Islam is a post-doctoral researcher, and Ray R Weil is professor of soil science, Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, Md. They thank Lauri Drinkwater and Peggy Wagoner for the opportunity to sample field experiments at the Rodale Research Center. This work was partially supported by a grant from the U.S. Department of Agriculture's Sustainable Agriculture Research and Education program (960113–7073).

  • Copyright 2000 by the Soil and Water Conservation Society

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Journal of Soil and Water Conservation: 55 (1)
Journal of Soil and Water Conservation
Vol. 55, Issue 1
First Quarter 2000
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Soil quality indicator properties in mid-Atlantic soils as influenced by conservation management
K. R. Islam, R. R. Weil
Journal of Soil and Water Conservation Jan 2000, 55 (1) 69-78;

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Soil quality indicator properties in mid-Atlantic soils as influenced by conservation management
K. R. Islam, R. R. Weil
Journal of Soil and Water Conservation Jan 2000, 55 (1) 69-78;
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