Abstract
Abstract Dryland winter rapeseed ( Brassica napus L.) produced in the semi‐arid regions of Turkey has variable yields. Supplemental irrigation alleviates the adverse effects of soil moisture stress on yield during drought periods. To determine the influence of irrigation timing on yield stability, a 3‐yr, on‐farm irrigation experiment was conducted to determine the effects of supplemental irrigation on rapeseed yield and yield components in a semi‐arid environment. The field experiment considered the influence of six irrigation quantities applied at three growth stages (vegetative, flowering, and early ripening) on rapeseed yield and quality. Supplemental irrigation improved rapeseed yield compared with cultivation under rainfed conditions throughout the three experimental years. Although the greatest seasonal evapotranspiration and rapeseed yields were observed with full irrigation, the highest economic rate and most efficient irrigation rate were for the optimum level to be applied at flowering. Protein content, oil content, and fatty acids increased with irrigation and were highest for the full‐irrigation treatment. Irrigation should be applied when 50% of available soil moisture has been consumed in the effective root zone at the early flowering stage. This timing enhances the water use efficiency and yield potential of rapeseed without reducing quality and could be highly beneficial for semi‐arid regions.
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Claims 6
Claim · model-written summary
Supplemental irrigation improved rapeseed yield compared with rainfed conditions in all three years.
Verbatim
e1“Supplemental irrigation improved rapeseed yield compared with cultivation under rainfed conditions throughout the three experimental years”
Claim · model-written summary
Full irrigation gave the greatest seasonal evapotranspiration and rapeseed yields.
- Taxon
- rapeseede2
- Treatment
- full irrigatione2
- Outcome
- seasonal evapotranspiration and rapeseed yieldse2
- Direction
- greateste2
Not reportedComparator
Verbatim
e2“Although the greatest seasonal evapotranspiration and rapeseed yields were observed with full irrigation, the highest economic rate and most efficient irrigation rate were for the optimum level to be applied at flowering”
Claim · model-written summary
The optimum irrigation level applied at flowering gave the highest economic rate and most efficient irrigation rate.
- Taxon
- rapeseedt0
- Treatment
- the optimum level to be applied at floweringe2
- Outcome
- economic rate and most efficient irrigation ratee2
- Direction
- higheste2
Not reportedComparator
Verbatim
t0“Supplemental irrigation impact on yield and yield quality parameters of rapeseed”
e2“Although the greatest seasonal evapotranspiration and rapeseed yields were observed with full irrigation, the highest economic rate and most efficient irrigation rate were for the optimum level to be applied at flowering”
Claim · model-written summary
Irrigation increased protein content, oil content and fatty acids of rapeseed, highest with full irrigation.
- Taxon
- rapeseedt0
- Treatment
- irrigatione3
- Outcome
- Protein content, oil content, and fatty acidse3
- Direction
- increasede3
- Qualifier
- highest for the full-irrigation treatmente3
Not reportedComparator
Verbatim
t0“Supplemental irrigation impact on yield and yield quality parameters of rapeseed”
e3“Protein content, oil content, and fatty acids increased with irrigation and were highest for the full-irrigation treatment”
Claim · model-written summary
Irrigation should be applied when 50% of available soil moisture has been consumed at the early flowering stage.
Verbatim
t0“Supplemental irrigation impact on yield and yield quality parameters of rapeseed”
e4“Irrigation should be applied when 50% of available soil moisture has been consumed in the effective root zone at the early flowering stage”
Claim · model-written summary
Irrigation at 50% depletion of available soil moisture at early flowering enhances water use efficiency and yield potential of rapeseed without reducing quality.
Verbatim
e4“Irrigation should be applied when 50% of available soil moisture has been consumed in the effective root zone at the early flowering stage”
e5“This timing enhances the water use efficiency and yield potential of rapeseed without reducing quality”
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