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1. Long-term Crop Rotation Diversity Effects on Soil C and NThe objective of this study was to evaluate the effects of nitrogen (N) fertilizer level and crop rotation diversity on soil organic carbon (SOC) and N stocks from a 34-yr study located in eastern Nebraska. Seven crop rotations (three continuous cropping systems; two 2-yr crop rotations, and two 4-yr crop rotations) and three N levels were compared. Soil samples were taken to a depth of 60-inches. Differences in SOC stocks were largely confined to the 0 to 3-inch depth with greater SOC (P =... M. Schmer, V. Jin, B. Wienhold, G. Varvel |
2. Soil Carbon and Agroecosystem Benefits of Conservation Management and Perennial Bioenergy Crop ProductionConservation agricultural management practices and perennial bioenergy crops can increase soil organic C (SOC) stocks on marginal soils yet the time necessary to observe these benefits, as well as the upper limit of C storage isn’t known. Co-benefits often associated with SOC accumulation are positive effects on water and nutrient retention, soil microbial biomass and diversity and soil structure, resulting in better soil quality. However, interactions between nitrogen fertilizer, crop biochemistry,... C.E. Stewart, V.L. Jin, M.R. Schmer, R.B. Mitchell, C. Williams, G.L. Miner |