Phosphorus, Potassium and Sulfur on Malt Barley

Balancing high yield with acceptable grain protein levels is a challenge for malt barley growers in semi-arid regions. Research in Alberta has shown that many farmers under-fertilize their malt barley with nitrogen (N) to avoid high protein, leading to grain yield losses of 10 to 40%. The objective of this research is to evaluate the necessary balance between N, phosphorus (P), potassium (K), and sulfur (S) fertilizer rates to maximize yield and ensure optimum malt barley quality.

The field trials were established at four locations, using two malt barley varieties...a 2-row and a 6-row. For each nutrient, separate trials were established, one evaluating four rates of P, one for three rates of K, and one for three rates of S. In 2002, P addition at one of the four sites increased grain yield, while kernel plumpness was increased at another site. Potassium addition increased yield at one site and S addition decreased plumpness at one site. All responses recorded to date were minor and of little agronomic or economic impact. AB-22