Midwest Cropping Systems Effects on Soil Properties and on a Soil Quality Index

ABSTRACT Cropping systems may improve or decrease soil quality depending on the specific crop rotation, nutrient amendments, and tillage practices employed. We conducted this study to determine the effect of six cropping systems in the Wisconsin Integrated Cropping Systems Trial on soil properties after 18 years of continuous treatments. We sampled soils (0-5-cm and 5-20-cm […] More »

Long-Term Cropping System Effects on Soil Properties and on a Soil Quality Index

Intensive row-crop production can lead to soil degradation over time if insufficient biomass return, intensive tillage, or excessive erosion lead to depletion of soil organic C. Soil quality may be improved by incorporating forage crops or grazing into the rotation, adding manure or other organic sources, and shifting to minimum tillage. We evaluated a range […] More »

NRI File Glossary, 1998

The NRI data on the biodiversity of soil organisms was collected in 1995, 1996 and 1997. The team developed the following sampling plan: 1) 16 (out of 50) quadrats (0.78 m wide by 3.13 m long) were randomly selected from each of the plots to be monitored; 2) eight times a season in 1995 and […] More »

Changes in WICST Soil Quality 1993-1998

The objective of this study was to monitor changes in various soil quality parameters under the four cropping systems selected for soil biodiversity measurements. The soil quality parameters were labile C (soil respiration), microbial biomass, and organic matter. The cropping systems evaluated were: continuous corn (CS1), the corn phase of a corn-soybean-wheat/red clover rotation (CS3), […] More »

Preliminary Report on Developing Sampling Proceedures and Biodiversity Indices Soil Biodiversity Project, 1996

Do cropping systems that vary in complexity have different degrees of biodiversity? Our multidisciplinary team has been working to address this question as it applies to cropping systems common in Wisconsin. Previous studies addressing this issue are of limited value because they focused on a single taxon, had inadequate sampling procedures (i.e., a single date, […] More »

NRI Project Summary 1996: Soil quality and Soil Health Component

Soil samples for soil quality analyses of microbial biomass and labile carbon were collected on 06/11/96 at Arlington Research Station (ARS) and on 07/02/96 at Lakeland Agricultural Complex (LAC) in conjunction with the other biodiversity teams. Fall sampling for chemical analysis was conducted at both sites on 09/16/96. Soil health was assessed through out the […] More »

Soil Microbial Biodiversity in Agroecosystems

Microbial populations are being analyzed by using rRNA probes in hybridization assays to evaluate changes in population density and composition as a function of cropping system and time. Our initial efforts have focused on: 1) developing high sample capacity nucleic acid extraction techniques that minimize the humic substance contamination, 2) assessing the reproducibility of extraction […] More »