Accessibility of subsoil potassium to wheat grown on duplex soils in the south-west of Western Australia

The B horizon of duplex soils in the wheatbelt of Western Australia is sometimes enriched with potassium (K). K supply from this source is, however, not taken into account in fertiliser recommendations based on soil tests on samples from the 0–10 cm layer. Grain yield responses of wheat to K were me...

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