The ISU Extension Weed page offer management information.
Iowa's Noxious Weed Law is explained by ISU weed specialists.
ISU Extension Yard and Garden Web offers information on home and commercial horticulture weeds.
2010 Herbicide Guide for Iowa Corn and Soybean Production (PM1898)
Weed Management Guide for Organic Farmers (PM 1883)
Other weed management publications are available from the ISU Extension Online Store.
Soil and Plant Analysis Laboratory offers soil chemical analysis for Iowa farmers, horticulturists, extension specialists and researchers.