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The application of potassium (K) fertiliser at rates up to 40 kg/ha of K significantly decreased the percentage of leaf area diseased for spot-type net blotch and powdery mildew of barley... The chloride source significantly reduced the percentage of leaf area diseased at rates of 10 and 20 kg/ha of applied K. The two sources of K (KCl, or K 2SO 4) gave significantly different yield response curves where powdery mildew was present... In regions prone to leaf disease we suggest farmers take soil samples before seeding to determine soil K levels...