J.D. Mollard and Associates (2010) Limited is a professional engineering, geoscience and environmental consulting firm based in Regina, Saskatchewan, Canada. Dr. Jack Mollard founded the original J.D. Mollard and Associates Limited in 1956, and over the next five decades Jack and his firm carried out more than 5,000 consulting assignments for governments, academia and private industry, across Canada and around the world. Read More
The purpose of this study was to track changes in known saline areas through time using air photos and to relate these changes to agricultural land use practices. Information on changing soil salinity conditions were used to establish trends for correlation with other parameters such as climate, grain prices, and production costs. The focus of the study was on sites where the PFRA staff have conducted on-farm salinity investigations in the Avonlea, Sk. area.
Air photos were collected from 1947 to 1991 and Landsat satellite imagery was acquired from 1984 and 1990. Salinity areas were mapped and salinity ratings were applied. A cyclic trend in severity of salinity was revealed likely due to differing climactic conditions through time. Other patterns noted in soil salinity had to do with the landscape position of the sites. Soil salinity sites were located on plains-transitional, uplands/ side slopes, and bedrock controlled areas. The study sites located at different landscape positions also showed differing trends of soil salinity severity through time.