PJB-2022-10
The impact of deficit irrigation regimes on yield and growth components of Safflower (Carthamus tinctorius L.)
Hajra Khan
Abstract
Safflower is an important crop of subtropical region and grown in deficit irrigation regime which influenced the grain and oil yields of safflower (Carthamus tinctorius L.). The study used a randomized full block design (RCBD) with three replications. Three plant growth phases, as well as three irrigation regimes, were studied. The effects of irrigation and water stress on grain output per hectare, thousand-grain weight, oil yield, and plant growth were investigated at various stages of development. The seasonal irrigation water usage and evapotranspiration for the non-stressed treatment were 270 and 730 mm, respectively, and the safflower grain production was 2.85 t/ha. The value of the seasonal yield response factor was 1.32. Depending on the deficit irrigation regime, the overall water usage efficiency ranged from 3.0 - 4.1 kg/ha/mm. Water stress had a substantial impact on safflower at the critical flowering period (include statistic results), with non-stressed treatments yielding the maximum yield during the flowering, yield formation, and ripening stages.
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