The researchers studied the distribution and abundance of the plant species of farmland woodlots in central Iowa, with particular emphasis on the differences in species composition between sites currently or recently grazed by cattle versus those that had not been grazed for more than 50 years. In addition, various attributes of common species and less common (restricted) species were compared.

Weed competition and economics are two common barriers to Iowa farmers' investing in tree plantings. This project examined seven weed control strategies and investigated productivity of small grain/forage combinations raised with trees in an effort to suggest management options that would encourage tree planting in the state.

The goal of this initial three-year project was to establish the pawpaw trees and bring them to fruiting stage. This was part of a long-term effort to evaluate the potential for an Iowa pawpaw tree fruit crop.

Non-timber specialty forest products show potential for farmers hoping to diversify their operations. This project and survey evaluated the interest in and obstacles to the production and marketing of these crops.

Those interested in planting black walnuts have lacked information about the best cultivars available for planting in Iowa. This project initiated long-term studies of several varieties of black walnut trees to determine the best cultivars for Iowa growers.

Shelterbelts have the potential to influence growth and yield from various cropping systems. On-farm tests were conducted to determine how shelterbelts interacted with corn, corn/soybean, and strip intercropping.

Field trials were conducted to determine if the pawpaw could serve as a successful alternative crop for farmers in the central United States.

Investigation of disturbed and intact woodlands herbaceous understories provided information on species present, biomass production and nutrient capture in preserved and secondary forests.

Yield data for corn (eight years) and soybeans (six years) were collected and analyzed to determine the impacts of a hybrid poplar shelterbelt on crop production on a central Iowa farm.

Planting trees on poor quality cropland may yield some benefits for increasing soil organic carbon. Test plots in four parts of Iowa were examined to determine the level of benefits possible to achieve.