International Sugar Journal

Crop age effects on leaf nutrient concentrations: Implications for interpretive criteria* [Full subscriber]

Abstract Leaf analysis is a widely used diagnostic tool in the management of the nutrition of sugarcane, with the critical nutrient concentration (CNC) approach being the most commonly used method of interpreting the nutrient data. In this short paper, data from multi-year nitrogen (N) response trials in KwaZulu-Natal are used to highlight the impacts of crop age on leaf macronutrient concentrations. Leaf concentrations of N, phosphorus (P), calcium (Ca), magnesium (Mg) and sulphur (S) decreased significantly at all three sites with advancing crop age from 3-7 months. Potassium (K) concentrations, on the other hand, generally increased or remained constant with…

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