Effect of soil amended with thin stillage on growth of canola and soil properties in a controlled environment study
A growth chamber study was conducted to evaluate the potential use of thin stillage as a soil fertilizer amendment. Seven treatments; control, 3 thin stillage rates (100, 200, and 400 kg N ha¯¹) and 3 urea rates (100, 200, and 400 kg N ha¯¹) were used in a replicated growth chamber study conducted in the spring of 2008 at the University of Saskatchewan. Canola (Brassica napus L.) was grown on a nitrogen deficient Brown Chernozemic soil (Haverhill Association). Dry matter yield and nutrient concentrations in plant tissues were determined after 34 days of growth. Significant increases in canola dry matter yield and nutrient content were observed due to thin stillage application. The thin stillage had a beneficial effect on plant growth by enhancing plant biomass production and nutrient uptake. Applications up to 400 kg N ha¯¹ did not have a negative effect on canola biomass production. Land application of the residual thin stillage from ethanol production, may be an effective method to recycle nutrients to improve and maintain soil productivity, and increase plant nutrient availability and plant growth.
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