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Interpretive Summaries:
1999 - Effect of Potassium Chloride on Physiological Leaf Spot, Grain Yield, and Quality of Winter Wheat in Saskatchewan
1998 - Effect of Potassium Chloride on Physiological Leaf Spot, Grain Yield and Quality of Winter Wheat in Saskatchewan
1997 - Effect of KCl on Physiological Leaf Spot, Grain Yield and Quality of Winter Wheat in Saskatchewan
1996 - Effect of KCl on Physiological Leaf Spot, Grain Yield and Quality of Winter Wheat in Saskatchewan
Effect of Potassium Chloride on Physiological Leaf Spot, Grain Yield, and Quality of Winter Wheat in Saskatchewan, 1999
Winter wheat production in western Canada is dependent on the crop being seeded into standing stubble and trapping an insulating layer of snow to prevent winter injury of the crop. The acreage of winter wheat is increasing steadily, and new semi-dwarf cultivars have been developed with high yield potential. Some of these new cultivars have been found to show strong physiological leaf spot symptoms when grown under favorable environmental conditions. Research in other areas of the Northern Great Plains has found that additions of potassium chloride (KCl) can help to suppress physiological leaf spot symptoms and increase grain yield.
In this final year of the project, a combined analysis of the four years of data found that additions of KCl suppressed the leaf spot damage in all trials where symptoms were recorded. While the average grain yield response to KCl additions was only 3 percent, sites which also had a higher incidence of root rot showed grain yield increases of up to 13 percent. In addition, KCl applications were found to improve both kernel weight and grain protein yield, important quality characteristics for marketing of the crop. It is important to note that there was no interaction between KCl and cultivars tested, indicating that where responses to KCl were recorded they were found on all cultivars, regardless of their susceptibility to physiological leaf spot. Recommendations that farmers apply KCl to suppress leaf spotting and increase grain yield have been included in the Winter Wheat Production Manual published for winter wheat growers in the Northern Great Plains. The manual can be viewed at: http//www.usask.ca/agriculture/plantsci/winter_wheat. SK-15F
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