Quantifying water stress of safflower (<i>Carthamus tinctorius</i> L.) cultivars by crop water stress index under different irrigation regimes.

In the first year, CWSI amount showed an increasing trend from April (0.071) in well-watered of Goldasht to July (0.831) in most severe water stress treatment of Local Isfahan because of increment in Tc-Ta differential and higher VPD amounts (Figures 2 and 3 ) during the reproductive stage of safflower ( Table 4 ).

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