Interrelationships between Potassium, Calcium, and Magnesium Nutrition of Zea mays L. |
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Authors: | FALADE J A |
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Institution: | Department of Soil Science, University of Ife Ile-Ife, Nigeria |
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Abstract: | The uptake of potassium, calcium, and magnesium ions by maizeand the interrelationships among the cations have been investigatedat 48 K: Ca: Mg ratios in culture solutions. Calcium was foundto stimulate K+ and Mg++ uptake at certain cation ratios butinhibit it at others. Potassium did the same for Ca++ uptake,and Mg++ for Ca++ and K+. The uptake of Mg++ was generally enhancedby K+. The sum of the cations in the plants expressed in meqwas fairly constant for treatments of the same K+ concentrationat the low to moderate levels of K+, but at considerably higher(> 24 meq l1) K+ levels the constancy was not dependenton K+ concentration. Potassium depressed, but Mg++ stimulatedphosphorus accumulation. Calcium stimulated phosphate absorptionat certain cation ratios but had no effect at others. The plantyield increased with increasing K+ up to 24 meq l1 ofK+ after which the yield tended to fall with further increasein K+. The yield was also increased by Ca++. Magnesium increasedthe yield at certain cation ratios and either depressed it orwas without effect at others. |
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