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handle: 10261/87402
[ES]Se estudia, en 12 campos de experimentación de trigo (var. Astral R-1) situados en la Cuenca media del Duero y abonados con varias dosis de nitrógeno, fósforo y potasio, la fertilidad de los suelos, a través de las relaciones entre su composición y las producciones conseguidas. La producción del testigo sigue una relación creciente con los niveles de nitrógeno y materia orgánica en el suelo. Los requerimientos en nitrógeno, fósforo y potasio disminuyen al aumentar los niveles de los respectivos nutrientes en el suelo. Además, las respuestas al fertilizante fosfatado disminuyen con el contenido de materia orgánica y las respuestas al potásico con la proporción de limo más arcilla. Niveles en el suelo inferiores a 0.09% de N, a 8 mg/100 de P2O5 y a 18 mg/100 g de K2O podrían restringir el crecimiento y rendimiento del trigo
[EN]Soil fertility has been studied by means of the relationship between its composition and crop yield in 12 field experiments with Astral wheat, located at the central Duero basin, which were fertilized with varying rates of nitrogen, prosphorus and potasium. The yield of the control is positevely related to the levels of nitrogen and organic matter in the soil. The requirements for nitrogen, phosphorus and potassium decrease as the levels of these nutrients in the soil increase. Also, the responses to phosphorus fertilizer decrease with organic matter content in the soil, and the responses to added potassium decrease with the proportion of silt plus clay. Levels in the soil lower than 0.09% N, 8 mg/100 g P2O5 and 18 mg/100 g K2O could limit growth and yiel of wheat.
15 páginas, 9 tablas. -- Los autores agradecen a D. Juan Bustos el análisis estadístico de los datos y a D. Dionisio González y a Dª María Luz Cosme la realización de la parte experimental
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