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handle: 10261/61012
[ES] Se estudia la evolución en la acumulación de los cationes K, Ca y Mg, y de algunas relaciones catiónicas, en dos híbridos de maíz, de origen diferente, creciendo en el campo en las mismas condiciones. El híbrido más precoz tiende a absorber rápidamente los cationes, durante el desarrollo vegetativo, mientras que el más tardío mantiene la absorción catiónica hasta la maduración. Las diferencias disminuyen en el orden potasio, calcio, magnesio. La intensidad catiónica y las razones K/Ca y K/Mg disminuyen a medida que crece el maíz y en función del tiempo, ajustándose a ecuaciones ele regresión altamente significativas, incluso lineales en algunos casos. El equilibrio iónico evoluciona disminuyendo la elevada proporción inicial de potasio en favor de los otros dos iones, primero en mayor beneficio del calcio y luego, desde que se forma el grano, del magnesio. La capacidad de síntesis orgánica es factor determinante de la acumulación catiónica, resultando para cada catión muy similares en ambos maíces las absorciones por unidad de grano obtenido o de materia seca total formada. Se hacen recomendaciones sobre la adición de los nutrientes catiónicos al maíz.
[EN] The evolution of K, Ca, and Mg accumulation and some relationships among these cations were studied on two different corn hybrids growing in the field under the same conditions. The early hybrid absorbed the cations rapidly al along its vegetative growth while the late hybrid kept on absorbing the cations until maturity was reached. The differences in absorption behaviour between the hybrids decreased in the following order: K, Ca, Mg. As long as plants were growing, the cationic intensity and the ratios K/Ca and K/Mg decreased and highly significant regression equations (some of them even linear) could be fitted to the data. The ion equilibrium evolved tending to decrease the high initial content of K in favor of the other two cations, Ca being favored mostly at the beginning and Mg after kernel formation. The potential of organic synthesis is a fundamental factor for cation accumulation. In both hybrids for each cation the absorption per kernel weight unit or per total dry matter were very similar. Some recommendations for addition of the cationic nutrients to maize are also given.
Peer reviewed
Cationic macronutrients, Zea mays L., Macronutrientes catiónicos
Cationic macronutrients, Zea mays L., Macronutrientes catiónicos
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