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handle: 10261/85766
[ES]Se estudia en cuatro campos de experimentación de trigo (var. Astral) de las provincias de Salamanca, Zamora y Valladolid, abonados con varias dosis de nitrógeno, fósforo y potasio, las relaciones del crecimiento de la planta al final del ahijamiento y en la antesis, y de la producción de grano con la composición mineral de la planta en las épocas señaladas. Al final del ahijamiento, el efecto de dilución parece alterar fuertemente las relaciones entre el crecimiento de la planta y su composición mineral, teniendo lugar éstas solamente en los casos de fuerte deficiencia en el nutriente, lo que impide establecer niveles óptimos. En la antesis, el nitrógeno y el fósforo apararecen como los principales limitantes del desarrollo de la parte aérea, y el calcio, junto con nitrógeno y magnesio, de la producción de grano. De las ecuaciones de regresión se estima que en la antesis los niveles óptimos en la hoja podrían estar alrededor de 4.5% para nitrógeno, de 0.42% para fósforo, de 1.5% para calcio y de 0.43% para magnesio.
[EN]The relationships of plant growth at the end of tillering and at anthesis and of final grain yield, with the mineral composition of the plant at these growth stages, have been studied in four field trials of winter wheat (var. Astral) with several rates of nitrogen, phosphorus and potassium in the provinces of Salamanca, Zamora and Valladolid. At the end of tillering, the dilution effect seems to alter strongly the relationships between growth and mineral composition of the plant; these relationships occur only with strong deficiency of the nutrient, thus preventing the establishement of optimal levels. At anthesis, nitrogen and phosphorus appear as the nutrients most limiting for the development of the aerial parts of the crop, while calcium, together with nitrogen and magnesium, are the most limiting for grain yield. Based on the regression equations it is estimated that the optimum levels in the leaf at anthesis could be around 4.5% for nitrogen, 0.42 % for phosphorus, 1.5% for calcium and 0.43% for magnesium.
14 páginas, 7 tablas. -- Con la colaboración técnica de: D. Dionisio González y Dña. Mª Luz Cosme y asimismo los autores agradecen al Dr. Fidel Escudero y a D. Francisco Busto el análisis estadístico de los datos.
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