On the centennial of Henry Agard Wallace's birth in 1988, it was recognized and memorialized in the U.S. Congress that the three generations of the Wallace family constituted the first family in the history of American agriculture.

The Wisconsin Integrated Cropping Systems Trial has been comparing different farming systems on two farm sites in southern Wisconsin since 1989. Inexplicable differences in the yields of corn grown in three systems stimulated research on the relationship between yield and the dynamics of root growth. The three systems were continuous corn with mineral fertilizer (CS1), corn—soybean—winter wheat—red clover (CS3), and corn—oat + alfalfa—alfalfa with dairy manure applied (CS5). Four or five sequential root samplings were taken each growing season on two sites for 3 years. Soil monoliths were taken from around the base of the plant and washed out over a 1-mm sieve. Estimates were obtained of the length and health of roots from different nodes that were attached to the crown of the plant. The seasonal accumulation of root length was estimated by summing the maximal root length produced at each root node. Corn grown in monoculture averaged 7.5 Mg of grain/ha, which was similar to corn grown after red clover green manure (7.3 Mg/ha) but less than corn grown after alfalfa with manure (8.5 Mg/ha). Contrary to expectations, corn grown in monoculture averaged 26% more root length over the season than CS3 and 12% more length than CS5. The differences were mostly due to increased production of later sets of roots (nodes 6–9) for the corn in monoculture. However, for the first sets of nodes (seminal—node 5) the percentage of healthy roots was lower in the monoculture system (59%) than in CS3 (63%) or CS5 (76%). The increased root growth associated with corn grown in monoculture may be a response to poor root health. Regressions with root growth accounted for a large amount of the variation in grain yields. Corn grown after alfalfa with manure achieved higher yields with less roots than did corn grown in monoculture. Yields in the former system plateaued at root lengths of 1 cm/cm3 and greater, producing grain yields that ranged from 8 to 10 Mg/ha. Corn grown in CS1 and CS3 showed curvilinear responses with calculated yield maxima of 8.7 and 9.9 Mg/ha at root lengths of 2.12 and 1.74 cm/cm3, respectively. Intensifying the use of rotations and organic manures seemed to increase the ability of the corn rooting system to support grain yields. The cause for this greater efficiency is not yet clear, though root health may be an important factor.

Biodynamic agriculture is an organic farming system that utilizes fermented herbal and mineral preparations as compost additives and field sprays. This study was conducted to determine whether biodynamic preparations affect lentil and wheat growth and yield, soil fertility, or weed populations in the short run. Each of four nutrient treatments, biodynamically prepared compost, non-biodynamic compost, mineral NPK fertilizer, and no fertilizer, were tested with and without biodynamic field sprays. Crop yield, crop quality, and soil fertility were similar in plots treated with mineral NPK fertilizers, biodynamic compost, or non-biodynamic compost. Use of compost raised soil pH from 6.0 without compost to 6.5 with compost. Compost application reduced the broadleaf weed population by 29% and reduced the grass weed population by 78%. Biodynamic sprays altered soil and grain N chemistry, but the effects are of unknown biological significance. Use of the biodynamic field sprays correlated with higher yield of lentil per unit plant biomass, lower grain C and crude protein contents, greater content in soft white spring wheat, and greater content in soil. In general, soils and crops treated with biodynamic preparations showed few differences from those not treated. Application of composts with or without the preparations produced similar crop yields with lower weed pressure, compared with equal nutrients supplied by mineral fertilizer, but any additional short-term benefits from biodynamic preparations remain questionable.

The strategic implications of a major, unique effort in the U.S. to expand organic food and agriculture are examined in this article. The authors recently completed an evaluation of the Upper Midwest Organic Marketing Project (UMOMP), funded initially by The Pew Charitable Trusts, and under the guidance of the Midwest Organic Alliance (MOA). The UMOMP was designed to increase the land area under organic production in North Dakota, South Dakota, Minnesota, Iowa, and Wisconsin. On the supply side, the focus was on organic grain, edible bean, and dairy commodities. On the demand side, an increase in organic food consumption was the focus in the Minneapolis—St. Paul metropolitan area. The UMOMP not only encouraged growth in demand, but also aided in the creation of necessary regional organic production, processing, distribution, and retail infrastructure. The UMOMP was generally successful, notably in the increased involvement of mainstream grocery stores in providing and promoting organic food products. Part of this success was due to the MOA's help in forging broker and distributor connections between mainstream stores and regional and national organic suppliers. A broad-based public awareness campaign about organic food and agriculture was another important element in the UMOMP strategy. The organic production and marketing educational effort should help to enable future expansion of organic hectarage. However, serious national or regional strategies to encourage organic farming probably will need other elements as well. Such strategies will involve some fundamental issues about the future structure and nature of organic farming and food systems, e.g., whether organic agriculture can remain centered on small- and moderate-sized family farms that operate in a somewhat independent and entrepreneurial fashion. Whether organic agriculture can be a vehicle for encouraging food systems that are more regional in geographic scope is a related issue. Preserving an organic farming and food system that differs substantially from the presently evolving “industrial” system may necessitate a slower and more deliberate approach than was used in the UMOMP. However, that could involve some sacrifice in the rate of growth in organic supply and demand.

In this paper we report on what “sustainable agriculture” means to farmers who seek to develop more sustainable farming systems. Group interviews were conducted with two groups of sustainable farmers in Kansas to learn how they developed their respective approaches, the kinds of parameters they have used to evaluate success and progress, and what other evaluation tools would be helpful to them. For the farmers we interviewed, the central meaning of sustainable agriculture is its holistic approach to assets management. It also means an alternative perspective on what constitutes success in farming. While economic considerations are important, they are balanced by other considerations such as environmental quality, quality of life, and the contributions the farmers can make to their communities. Sustainable agriculture also means an approach to agriculture that entails “thinking risks” as much as financial risks. Lastly, sustainable agriculture means whole farm planning; the farmers we interviewed were more interested in applying whole-farm planning principles based on their local knowledge, than in evaluation tools based on the expert knowledge of researchers and other scientists. The implications of what sustainable agriculture means to these farmers for research and educational programs are discussed.

A statistical model of crop-weed competition is developed to permit, but not require, the existence of crop tolerance of weed pests. The popular rectangular hyperbolic model of crop-weed competition is shown to be a special case of the more comprehensive model. Application of the model to corn weed control in Massachusetts demonstrates its practicality and detects evidence of pest-tolerant crop response in this crop-weed system.