Influence of interactions of barley cultivars with soil and fertilizer K, and soil pH on grain yield and quality
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The interaction of exchangeable soil K with cultivars resulted in differences in grain production by five barley cultivars. The cultivars differed in the amount of exchangeable soil K required to produce maximum yield. Bonanza attained its maximum yield at 183 kg K2O ha−1, but Galt did not reach its maximum yield until a high level of exchangeable soil K was reached (252 kg K2O ha−1). The other cultivars were within this range. The cultivars also differed in their yield response to applied K fertilizer. Under conditions of growth-limiting K supply, Galt and Gateway were slightly more responsive to the addition of K fertilizer than were Centennial and Conquest, and much more responsive than Bonanza. The interactions of exchangeable soil K and soil pH or soil NO3−N and soil pH with cultivars indicated differences in acid tolerance of the cultivars. Galt was more pH sensitive than Bonanza.
Key wordsBarley cultivar Exchangeable potassium Protein yield
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