International Sugar Journal

Potassium dynamics in the soil-plant system and implications for fertiliser recommendations* [Full subscriber]

Abstract Globally, in the development of potassium (K) fertiliser recommendations, neither non‑exchangeable K reserves (reserve-K) nor K fixation are taken into account, due to the difficulties involved in their measurement. However, failure to account for these parameters may contribute to serious inaccuracies in addressing crop K requirements. This study assessed the impacts of including reserve-K and K fixation when developing fertiliser recommendations for sugarcane, and the potential of mid-infrared spectroscopy (MIR) to estimate these parameters. The investigation involved two field trials on soils with contrasting reserve-K and K fixation capacity, as well as a laboratory study on 132 topsoils, which…

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