Organic and conventional production systems: Corn and soybean yield trends 1990-2010.

Over the past two decades agronomists have used steady to positive yield trends as evidence of a sustainable cropping system (Jenkinson, 1991; Singh and Jones, 2002; and Bundy et al., 2011). However, some writers have suggested modern agriculture is predisposed to, unsustainable negative yield trends because it relies on large machinery, manufactured pesticides, and [...] More »

Organic System Yields and Yield Trends in the Wisconsin Integrated Cropping Systems Trials

The USDA-ERS held a conference in Washington D.C. from March 16-18 on organic farming systems research that included several long-term systems research trials across the USA.  These slides summarize long-term yield trends on organic and conventional crops in WICST. Authors: Jon Baldock, Joshua Posner, John Hall, and Janet Hedtcke More »

Response of Herbivores and Natural Enemies to Organic and Conventional Management of Field Crops

Organic agricultural production in the United States has continued to expand; the amount of organically managed land doubled from 1990-2002 and again from 2002-2005 (USDA 2009). The rising prevalence of organic farming systems in the agricultural landscape has necessitated efforts to understand their ecological impacts. Numerous studies have found greater abundances of predatory or beneficial insects on organic compared [...] More »

Weed Seedbank Community Changes on the Wisconsin Integrated Cropping Systems Trial (WICST): 1992-2004

The goal of this study was to compare the effect of six different cropping systems over a 14-year period on: •Weed seed density; •The weed seed community; and, •To statistically test the hypothesis developed at the onset of the Wisconsin Cropping Systems Trial (WICST) at ARL UW- Research Station trial in 1990 Authors: H. Kümmel, J. Doll, J. Posner, [...] More »