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Salinity–Grain Yield Response Functions of Barley Cultivars Assessed with a Drip-Injection Irrigation System

^a Unidad de Suelos y Riegos, Servicio de Investigación Agroalimentaria (Diputación General de Aragón, DGA), and Laboratorio Asociado de Agronomía y Medio Ambiente (DGA–CSIC), Apartado 727, 50080 Zaragoza, Spain
^b Departamento de Genética y Producción Vegetal, Estación Experimental de Aula Dei (Consejo Superior de Investigaciones Científicas, CSIC), and Laboratorio Asociado de Agronomía y Medio Ambiente (DGA–CSIC), Apartado 202, 50080 Zaragoza, Spain

View larger version (77K): [in a new window]   Fig. 1 Schematic layout of the DIS irrigation network. Each of the salinity Treatments 1 through 9 is characterized by its target ECiw (irrigation water EC) value, and are split into one to three irrigation sectors. Each irrigation sector has four laterals with the appropriate number of emitters to deliver its target ECiw (see example in left dashed rectangle). The number of 1.5 m2 barley plots in each sector is indicated within the small rectangles. The location of Replications 1 and 2 is shown on the right of the figure

View larger version (22K): [in a new window]   Fig. 2 Measured weekly volumes of irrigation water (Viw) and barley evapotranspiration (ETc), and calculated weekly leaching fractions (LF) for the period 15 Feb. to 15 May 1995

View larger version (31K): [in a new window]   Fig. 3 Soil salinity (ECe)–Grain yield response functions of 10 barley cultivars developed using the option 12 of the SALT program (van Genuchten, 1983) using data obtained with the drip-injection irrigation system. Replication 1: +, dashed line; Replication 2: x, solid fine line; Replications 1 + 2: solid thick line

View larger version (24K): [in a new window]   Fig. 4 Relationships between (A) estimated grain yields in the control (Ym) and at ECe values of 9 (Y9) and [17 (Y17)] dS m-1, (B) Y9 and Y17, and (C) ECe50 and Y9 and Y17. The number of cultivars used in these analyses was nine (i.e., the cultivar `Kym' was deleted)

View larger version (18K): [in a new window]   Fig. 5 Relationship between the ECe50 values obtained in the DIS and the TLS. The number of cultivars used in this analysis was nine (i.e., the cultivar `Kym' was deleted)