Endogeic and Anecic Earthworm Abundance in Six Midwestern Cropping Systems

ABSTRACT Endogeic and juvenile anecic abundance was measured in soil samples and anecic populations were studied by counting midden numbers at the sites of two long-term cropping systems trials in South-central Wisconsin. The three grain and three forage systems at each site were designed to reflect a range of Midwestern USA production strategies. The primary objectives [...] More »

Earthworm Populations at the Wisconsin Integrated Cropping Systems Tria

Many farmers, organic gardeners, and researchers have recognized earthworms as important organisms contributing to “healthy” soils (Romig et al. 1995). Earthworms are frequently associated with their ability to mix the soil (Cook and Linden 1996, Marinissen and Hillenaar 1997), increase rates of water infiltration (Bouche and Al-Addan 1997, Linden et al. 1991, Zachmann et [...] More »

Cover crop after wheat harvest for reduced N-leaching and increased forage production

The objective in this trial was to help transition from the small grain phase to the subsequent corn phase, including the addition of manure. The conflict is if manure is added, it is better to incorporate it, and if incorporated, the grower will loose the ground cover that is afforded by the wheat stubble. [...] More »

Superimposed Manure Additions on WICST Plots at Lakeland Ag Complex

Manure additions were superimposed onto the existing WICST plots at LAC to measure environmental and production impact on the following corn phase. Authors: Jim Stute, Joshua Posner More »

Vertical Distribution Of Phosphorus Under Long-Term Cropping Trials

Abstract: Historically, due to its high soil fixation rates and low solubility, phosphorus has not been considered an environmental menace, but years of over-application and the shift in American agriculture from small family farms to large corporate enterprises (McDowell et al., 2001; Sharpley et al., 2001) has led to phosphorus buildup and leaching in many [...] More »

Earthworm populations on the WICST Plots (1999-2001)

In this study, our primary objective was to determine the effect of crop rotation on earthworm abundance. Two types of earthworms are found on the WICST plots: topsoil-dwelling and subsoil-dwelling (night crawlers) species. Authors: Jon Simonsen, Martha Rosemeyer, and Josh Posner More »

Effects of Agricultural Cropping Systems on Soil Microbial Community Structure

Microorganisms of the Bacteria (no nucleus), Eucaryotes (nucleus), and Archae (an ancient anaerobic group) were sampled using molecular techniques so that unculturable microorganisms could also be assessed. The general structure of the microbial community changed with cropping system (CS3, CS5, CS6) at Arlington in one soil sampling time in 1996. The Eukaryotes dominated [...] More »