Fig. 3. Relationship across the subset of trials, from NE Spain or SE Spain, between water input from sowing to heading and (a) grain yield or (b) carbon isotope discrimination of mature grains (), and between water input from heading to maturity and (c) grain yield or (d) carbon isotope discrimination. Each point represents either a rainfed or irrigated trial (composed by 25 genotypes and four replicates per genotype) grown in NE Spain or SE Spain.