Crop Production and Soil Organic Matter in Long-Term Crop Rotations in the Sub-Humid Northern Great Plains of Canada
This chapter summarizes the findings to date of the Indian Head and Melfort long-term rotation experiments as they relate to soil organic matter and crop production and examines the feasibility of managing crops on these soils so as to sequester C. The soil at Indian Head is classified as an Indian Head heavy clay. It was developed on clayey lacustrine deposits underlain by till and is situated on gently undulating topography showing slight evidence of wind erosion. The rotation experiment at Indian Head includes a series of spring-wheat-based rotations varying in frequency of summer fallow, fertilization, residue management, and includes legumes for green manure and forage crops. The experiments at Indian Head and Melfort were initiated by agronomists with the objective of providing yields and economic answers. Thus, neither organic matter nor nutrient use by the crop were monitored over the study period.