Kinetics of nutrient uptake by root system of teak superior clones

A hydroponic experiment was carried out to measure the uptake kinetics of Ca 2+ 、 Mg 2+、 K+、 and NO-3 of one year old seedlings of four teak superior clones. The results show that there are no many gaps between maximum uptake velocities of the four ions (Vmax) calculated either by total absorbing area or by total dry mass of root system of the four teak clones. There are significant differences in Vmax and net influx rates of the nutrients into roots ( value) of the four teak clones, while there are little differences in values of Km of Ca 2+ 、 Mg 2+、 K+、 and NO-3 uptake. The teak clone VI-23 from Burma has the maximum of Vmax and value for Ca 2+ 、 Mg 2+ and NO-3 uptake, while the 70-12 from India has the maximum of Vmax and value for K+ uptake, which indicates that the clone VI-23 is the special genotype with efficient uptake of Ca, Mg and NO-3, and the clone 70-12 for efficient uptake of K nutrition.