They want to know more about the long-term effects on their soil. Field sampling was conducted in September 1993, April 1994, and September 1994. Results to date are highly tentative. Initially biosolids raised soil salinity and decreased soil pH. Several physical parameters were favorably influenced by biosolids. At one location, enhanced growth of wheat in the fall due to biosolids significantly increased ground cover reducing potential overwinter erosion.
Growers are aware of our work and are anxious for the results.
Soil erosion due to furrow irrigation on sloping lands in the Columbia Basin is a serious problem. In addition, erosion compromises water quality with sediment and adsorbed agrichemicals. With over 300,000 acres of land in Washington still using furrow irrigation, the potential for reducing soil erosion and sedimentation is substantial. Three conservation districts in Grant County jointly requested funding from the Conservation Commission. Field testing was conducted on two farms in Grant County.