The study of a leaf chlorosis of coffee resembling the magnesium deficiency symptom in some other fruit crops
A chlorosis of the leaves from basal node positions of plagiotropic branches on coffee trees, growing in Costa Rica, has been observed. Foliar analysis showed that the chlorosis could be associated with leaf magnesium levels of 0.21 per cent or loss although the soil magnesium appeared adequate. The magnesium concentration of leaves from fourth nodes was significantly higher than leaves from more basal nodes. Leaf and soil calcium concentrations were found to be low. The leaf potassium concentration was found to be high in relation to magnesium. Stem injections and soil applications of magnesium sulfate significantly increased the leaf magnesium concentration and decreased the severity of the symptom as measured by visual estimates. Soil applications of nitrogen increased while soil potassium applications decreased the magnesium concentration of fourth node leaves. The presence of fruit increased the severity of the chlorosis when measured visually. Varieties tended to have similar leaf magnesium concentrations when the chlorosis symptoms appeared although further study appears advisable before drawing any conclusions. Erosion and leaching of soil calcium and magnesium resulting in insufficient antagonism between calcium and potassium is suggested as a possible cause of the deficiency
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| Format: | biblioteca |
| Published: |
Ithaca, N.Y. (EUA)
1955
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| Subjects: | COFFEA ARABICA, CLOROSIS, DEFICIENCIA DE MINERALES, MAGNESIO, FERTILIZANTES NPK, CALCIO, ABSORCION DE SUBSTANCIAS NUTRITIVAS, TRANSLOCACION, COSTA RICA, ANALISIS DE TEJIDOS, |
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