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Strategies to Improve Nitrogen Use Efficiency in Winter Cereal Crops under Rainfed Conditions

^a Dep. Producción Agraria, Universidad Pública de Navarra, Campus Arrosadía s/n 31006 Pamplona, Spain
^b Dep. Producción Vegetal: Fitotecnia, ETSIA, Univ. Politécnica de Madrid, Avda Complutense s/n 28040 Madrid, Spain

View larger version (20K): [in this window] [in a new window]   Fig. 1. Monthly temperature and rainfall, during 1953 to 2004 and during the cropping period of each year of experiment.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Quadratic plus plateau model fitting to grain yield (88% dry wt.) in 2002–2003 and 2003–2004. Fertilizer rates correspond to Control, X-2A, X-A, X, and X+A treatments. Each point is the mean value of four replications and bars show the standard error of the mean. Model fitting was performed with all replications but only means plus standard error are reported to improve readability.

View larger version (8K): [in this window] [in a new window]   Fig. 3. Treatment influence on green leaf area index, in three growth stages and each year. Within a growth stage and year, data following common letters are not significantly different according to Fisher LSD at a 0.05 probability level. Bars indicate standard error of the mean.