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Tillage System, Preceding Crop, and Nitrogen Fertilizer in Wheat Crop

II. Water Utilization

^a Dep. de Ciencias Agroforestales, Univ. of Huelva, Campus de La Rábida, 21819 Palos de la Frontera (Huelva), Spain
^b Dep. de Ciencias y Recursos Agrícolas y Forestales, Univ. of Córdoba, Córdoba, Spain
^c Dep. de Producción Vegetal y Tecnología Agraria, Univ. of Castilla-La Mancha, Spain

View larger version (15K): [in this window] [in a new window]   Fig. 1. Relationship among N rate and grain yield as a function of preceding crop in a rainfed wheat. Mean data from 6 yr. Vertical bars indicate LSD at P < 0.05 for comparison N rates: (a) within a preceding crop, and (b) between preceding crops. *, **, *** Significant at the 0.05, 0.01, and 0.001 probability level, respectively.