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Climatic and Water Availability Effects on Water-Use Efficiency in Wheat

^a Unidad Integrada Balcarce, Estación Experimental Agropecuaria (EEA) Balcarce of INTA (Instituto Nacional de Tecnología Agropecuaria) and Facultad de Ciencias Agrarias of Univ. Nacional de Mar del Plata, CC 276 (7620), Balcarce, Bs.As., Argentina
^b EEA Manfredi, INTA, Ruta 9, Km 636 (5988), Manfredi, Córdoba, Argentina
^c EEA Pergamino, INTA, CC 31 (2700), Pergamino, Bs.As., Argentina
^d EEA Paraná, INTA, CC 128 (3100), Paraná, Entre Ríos, Argentina

View larger version (21K): [in a new window]   Fig. 1. WUE vs. VPD showing fit of Eq. [4], for crops with high (H, irrigated) or low (L, rainfed) water availability, during the period with green area index 5 in H crops. (a) VPD computed with = 0.50; line a: H fitted with ßH = –1; line b: H and ßH both fitted. (b) VPD computed with = 0.72 (adjusted for H crops); line a: H fitted with ßH = –1; line b: L fitted with ßL = –1, data from Exp. PE98 was excluded (see text). See Materials and Methods for explanation of the parameter, and Table 5 and Table 6 for fitting details.

View larger version (26K): [in a new window]   Fig. 2. Dependence of cumulative DW on cumulative WU and cumulative WU VPD–1, for crops with high (H, irrigated) or low (L, rainfed) water availability, during the period with green area index 5 in H crops. (a) WU VPDß with ß = 0. (b) fit of Eq. [5] with ß = –1, VPD computed with = 0.72, fitted; line a: H crops; line b: L crops, data from Exp. PE98 were excluded (see text). See Materials and Methods for explanation of the parameter. SEE, standard error of estimations of DW (as percentage of mean dry weight in brackets).

View larger version (31K): [in a new window]   Fig. 3. Different functional relationships between relative DW and relative WU when observations under low water availability are expressed relative to observations under high water availability (see Table 7 for data). Line a: Hanks (1974) relationship (Eq. [16]); line b: Deduced Eq. 19; and line c: Quadratic regression. SEE, standard error of estimations of relative DW.