Abstract
Abstract Growth chamber studies were conducted to compare two procedures for measuring potassium influx kinetics by intact corn (Zea mays L.) seedlings. It was assumed in both procedures that K uptake by corn followed Michaelis‐Menten kinetics. In the first procedure (depletion method) corn seedlings were grown in complete nutrient solution for 7, 10, 14 and 28 days. The nutrient solution contained ≤ 500 μM K. Potassium influx kinetics were determined by transferring plants into nutrient solution containing 200 μM K and following the rate of K depletion from solution over time. In the second procedure (Hofstee method) six K concentrations ranging from 24 to 246 μM were established and maintained by daily additions of K. Corn seedlings were harvested from each of the six treatments at 7, 10, 14, 21 and 28 days and K was measured in the shoots and roots. Average net K influx rates were calculated for each treatment at each harvest date. The average influx rates were paired with the measured average K concen...
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