Potassium (K) is often supplied as topdressed MOP before seeding. However, this may not be the most effective method of application since the K may be pushed into slower-wetting inter-rows by seeding bars. In this trial, K was supplied in differing rates by topdressing MOP immediately after seeding PSPE, after emergence, or in a full NPK compound granule, Vigour, drilled at seeding with or without supplemental MOP to examine effects on germination and emergence and later grain production.

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