Crop residue removal effects on corn yield and fertility of a Norfolk sandy loam

To meet future demands, alternative energy sources will be needed because long-term energy problems have not been solved. Crop res-idue may provide a readily available on-farm bioenergy source, but effects of removing residue on soil fertility, water conservation, and crop production need further investigation. A 4-yr field experiment was conducted on a Norfolk sandy loam (Typic Paleudults) to de-termine the effects of removing crop residues on soil pH, extractable nutrient concentrations, and yield of corn (Zea mays L.). Four stover management treatments evaluated between 1979 and 1982 included conventional tillage with stover incorporated, and con!iervation til-lage with 0, 66, or 90 % of the stover removed. Treatments were split and evaluated with and without supplemental irrigation. Extractable nutrient concentrations were evaluated by comparing values ob-tained from an initial soil sampling with those of samples collected each fall thereafter. Ear leaf analyses were used to monitor treat