Ameliorative effect of potassium on rice and tomato subjected to sodium salinization
1996
Song, J.Q. (Tottori Univ. (Japan). Faculty of Agriculture) | Fujiyama, H.
Rice (Oryza sativa L. cv. Yamabiko) and tomato (Lycopersicon esculentum Mill cv. Saturn) plants subjected to Na-salinization (NA: 80 mmol(+) Kg(-1) Na) in hydroponics were grown after the addition of K at five concentrations (K1: 10, K2: 20, K3: 30, K4: 40, K5: 50 mmol(+) kg(-1)). The effect of K on their growth was analyzed in terms of transpiration, cation uptake, and transport. A similar tendency for the above parameters was obtained in both species. The addition of 10 mmol(+) kg(-1) K improved the growth by decreasing the content of Na and increasing the K content of the plants. The growth of the plants, however, was reduced along with the increase of the K concentration and became comparable to that of NA at K5. The total cation content increased with the increase of the K concentration, which was due to the increase of the K content. A close relationship was observed among the osmotic potential of the solution, cumulative transpiration, and dry weight for both species among the K treatments. Addition of K suppressed the uptake of other cations by rice and tomato in the order of Na Mg Ca, with a very small suppression for Ca and Mg. The depression of Na uptake by K could be due to the antagonism between the two cations
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