Omololu Idowu, George Abawi, Harold van Es, David Wolfe, Robert Schindelbeck, and Bianca Moebius. Cornell University, 1015 Bradfield Hall, Ithaca, NY 14853
Soil quality assessment is important for the purpose of monitoring soil degradation and providing a useful basis for soil and crop management planning. A study was carried out to identify rapid, inexpensive and agronomically useful indicators to track down changes in soil quality on farmlands under alternative management systems in New York State. Surface soil samples were collected across different soils and crop management practices and used for different physical, chemical and biological analyses. The physical soil properties considered were bulk density, macro-porosity (> -0.3kPa), meso-porosity (-30 to -0.3kPa), micro-porosity (-1500 to -30kPa), residual porosity (< -1500kPa), micro penetration resistance, saturated hydraulic conductivity and wet aggregate stability of 0.25-2.00mm and 2.00-8.00mm clod sizes. Chemical properties measured were available phosphorus, exchangeable magnesium, exchangeable calcium, pH and organic matter content. Biological measurements determined were root disease potential using a bean bioassay technique, saprophytic nematode counts, total parasitic nematode counts, potentially mineralizable nitrogen and the decomposition rate. Results from the first year of data show a high degree of inter-correlation among various physical, chemical and biological properties. Promising properties that could serve as potential soil quality indicators include micro-porosity, macro-porosity, bulk density, wet aggregate stability, root disease potential, potentially mineralizable nitrogen and pH. Research efforts still continue to expand our database for soil quality assessment and to study how these indicators relate to crop growth and yield.
Back to Indicators for Soil Management
Back to S03 Soil Biology & Biochemistry
Back to The ASA-CSSA-SSSA International Annual Meetings (November 6-10, 2005)