Abstract
Abstract Suitable plant diagnostic procedures for nitrogen (N) management in high input crops such as potato (Solanum tuberosum) and peppermint (Piper mentha) should be derivative [measuring instantaneous nitrogen (N) uptake] rather than integrative (total accumulation) and should reflect concurrent soil N availability. Analyses for dry matter or sap nitrate (NO3) in potato petioles or peppermint stems are proposed as derivative procedures, but the plant‐soil NO3 relations of these analyses are not well understood. Our objectives were to test the validity of these derivative plant diagnoses as measures of concurrent uptake against the Michaelis‐Menten model of saturation kinetics. Periodic measures of dry matter and sap NO3 in potato petioles and peppermint stems were taken from field experiments with various rates and timings of N fertilizer, and regressed against concurrent soil NO3 (0–30 cm) by nonlinear least squares fit to the model: V = (Vmax · SN)/(Ks + SN) where: V = potato petiole or peppermint s...
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