Critical nutrient uptake ability of tomato plants (Solanum lycopersicum L.) grown using the nutrient film technique (NFT) by descending nutrient concentration method
2010
Gonzales, J.A., Chiba Univ., 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522 (Japan) | Maruo, T. | Shinohara, Y., Chiba Univ., 648 Matsudo, Chiba 271-8510 (Japan)
The critical nutrient uptake ability of each element in tomato plants (Solanum lycopersicum L. cv. Reika) grown using the Nutrient Film Technique (NFT) was investigated by descending nutrient concentration method using three seedling sizes. All the cultures started from different concentrations of nutrient solution and supplemented only with rainwater. The changes in NO3-N concentration of nutrient solution decreased right after the start of the experimental period in all the different seedling stages. The bigger plants absorbed the nutrient elements very fast and reached the final concentration faster than younger plants, but uptake by all the plant stages reached almost the same final concentration. The changing patterns of the concentration of other elements were similar to those of nitrate. The uptake rates of each element were measured to determine the points for the critical uptake rate to become zero. A zero value means that the plants can no longer absorb the nutrient from the solution. The critical nutrient concentrations for tomato obtained in the experiment were, 0.01-0.04 me/L for NO3-N, 0.02-0.09 me/L for PO4-P, 0.03-0.10 me/L for K, 0.02-0.20 me/L for Ca, and 0.01-0.09 me/L for Mg. These concentrations were lower than those of the ascending method in the previous study. The differences in the values of the critical nutrient concentration of each element are discussed.
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