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Effects of Tillage, Crop Rotation, and Nitrogen Fertilization on Wheat under Rainfed Mediterranean Conditions

^a Dep. de Ciencias y Recursos Agrícolas y Forestales, Univ. of Córdoba, P.O. Box 3048, Córdoba, Spain
^b Dep. de Ciencias y Recursos Agrícolas y Forestales, Univ. of Córdoba, P.O. Box 3048, Córdoba, Spain
^c Dep. de Producción Vegetal, Univ. of Extremadura, Badajoz, Spain
^d F.J. opez-Bellido, Dep. de Producción Vegetal y Tecnología Agraria, Univ. of Castilla-La Mancha, 13071 Ciudad Real, Spain

View larger version (53K): [in a new window]   Fig. 1 Monthly mean temperature for 4 yr at Córdoba

View larger version (32K): [in a new window]   Fig. 2 Effects of years and crop rotation, tillage method and N rate on total dry matter, seeds head-1, and seed mass at Córdoba (Spain) (NT, no tillage; CT, conventional tillage; CW, continuous wheat; WS, wheat–sunflower; WCP, wheat–chickpea; WFB, wheat–faba bean; WF, wheat–fallow). Vertical bars represent LSD (P < 0.05): (a) within a year (b) between years

View larger version (64K): [in a new window]   Fig. 3 Effects of tillage method, crop rotation, and N rate on total dry matter, head m-2, and seeds head-1 at Córdoba (Spain) (NT, no tillage; CT, conventional tillage; CW, continuous wheat; WS, wheat–sunflower; WCP, wheat–chickpea; WFB, wheat–faba bean; WF, wheat–fallow). Vertical bars represent LSD (P < 0.05): (a) within a tillage method or a crop rotation (b) between tillage methods or crop rotations