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Fertilizer Nitrogen Efficiency in Durum Wheat under Rainfed Mediterranean Conditions: Effect of Split Application

^a Dep. de Ciencias y Recursos Agrícolas y Forestales, Univ. of Córdoba, Campus de Rabanales, Edificio C-4 "Celestino Mutis," Ctra. Madrid km 396, 14071 Córdoba, Spain
^b Dep. de Ciencias Agroforestales, Univ. of Huelva, Spain
^c Dep. de Producción Vegetal y Tecnología Agraria, Univ. of Castilla La Mancha, Spain

View larger version (30K): [in a new window]   Fig. 1. Monthly and annual rainfall and mean maximum and minimum temperature for 3 yr at Andalucia region, Spain.

View larger version (53K): [in a new window]   Fig. 2. Effect of year and N timing on durum wheat grain yield in a experiment at Andalucia region over 3 yr (N timing: sowing–tillering–stem elongation). Vertical bar LSD (P < 0.05) and SE of the mean.

View larger version (14K): [in a new window]   Fig. 3. Relationship between soil nitrate (profile 0–90 cm) and total N uptake at durum wheat maturity for all N timing in a experiment at Andalucía region (solid symbols indicate control zero N).

View larger version (18K): [in a new window]   Fig. 4. Nitrogen fertilizer recovery (%) of 15N labeled fertilizer (NR) and N derived from 15N fertilizer (NF) in the whole plant at maturity for durum wheat as affected N timing in a experiment at Andalucía region. Mean 3 yr (1999–2000, 2000–2001 and 2001–2002). For each indices treatment means followed by the same letter are not significantly different at P < 0.05 according to LSD.