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Influence of nitrogen fertilization, cation concentration, and root cation-exchange capacity on calcium and potassium uptake by plants



Influence of nitrogen fertilization, cation concentration, and root cation-exchange capacity on calcium and potassium uptake by plants



Soil Sci 82(2): 165-172



Varying the Ca/k in the nutrient solution from 1/10 to [degree][degree] at constant Ca had only a minor effect on Ca45 absorption by beans and barley. There was evidence of a slight stimulation of K on Ca45 uptake for some concentrations. Decreasing Ca concentra-tion in the nutrient solution from 10-1 to 10-2 [image] and also from 10-2 to 10-3 [image] resulted in a decrease of Ca45 uptake which was approximately equal to the square root of the concentration difference. Varying the K/Ca in the nutrient solution from [degree][degree] to 1/10 at constant K had a decreasing effect on K42 uptake by beans and barley. There was no evidence of a Ca stimulation of K uptake. For low-salt roots, decreasing K concentration by a factor of 10 reduced the K42 absorption by about 1/5 but for high-salt roots the reduction was by about 1/10 or directly related to the concentration differences. There was evidence that for beans and barley the Ca45 accumulated in roots and for whole plants for K42 could be expressed by the relationship: [image] For K, this is the reverse of that found in soil. N fertilization increased the C.E.C. of roots of at least some plant species. The N influence of C.E.C. of roots was most marked on plants with a low root C.E.C. This indicates the possible nitrogenous nature of cation exchange sites, helps substantiate the inverse K ratio and Ca ratio square relationships for explaining differential cation uptake by plants, and helps to explain N fertilizer influence on cation absorption by plants. An example with leaves of field-grown mature Valencia orange trees under different N levels was given where the N influence on root C.E.C. explained differential leaf contents of K and Ca according to the equations proposed.

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