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Simulation of Maize Grain Yield Variability within a Surface-Irrigated Field

^a Dep. Genética y Producción Vegetal, Estación Experimental de Aula Dei (CSIC), Apdo. 202, 50080 Zaragoza, Spain
^b Unidad de Suelos y Riegos, Servicio de Investigación Agroalimentaria (DGA), Apdo. 727, 50080 Zaragoza, Spain

View larger version (26K): [in a new window]   Fig. 1. Detail of the location of the field measurements.

View larger version (23K): [in a new window]   Fig. 2. Daily crop water requirements (ETc), precipitation, and irrigation during the maize crop season.

View larger version (72K): [in a new window]   Fig. 3. Two-dimensional plots of the measured and the EPICphase-calculated maize grain yields for the different estimation and simulation methods of water infiltration.

View larger version (80K): [in a new window]   Fig. 4. Two-dimensional plot of the soil total available water for the maize crop considering a maximum rooting depth of 1.5 m.

View larger version (18K): [in a new window]   Fig. 5. Comparison of maize grain yield measured and calculated with EPICphase depending on the estimation method of water infiltration. Each point represents the yield at one location. The dotted line represents the 1:1 relationship. The equation and the solid lines correspond to the regressions of calculated against measured yield. Intercepts were significantly different from 0, and slopes were significantly different from 1 at the 95% confidence level.

View larger version (35K): [in a new window]   Fig. 6. Comparison of maize grain yield measured and calculated with EPICphase depending on the simulation method (with the irrigation model B2D) of water infiltration. Each point represents the yield at one location. The dotted line represents the 1:1 relationship. The equation and the solid lines correspond to the regressions of calculated against measured yield. Intercepts were significantly different from 0, and slopes were significantly different from 1 at the 95% confidence level.

View larger version (29K): [in a new window]   Fig. 7. The relationship between maize grain yield measured (open symbols) or calculated with EPICphase (closed symbols) and the available water for the crop depending on the estimation and simulation method of water infiltration. Each point represents the yield at one location.