Abstract
To better understand the potential for improving biomass accumulation and radiation use efficiency (RUE) of winter wheat under deficit irrigation regimes, in 2006-2007 and 2007-2008, an experiment was conducted at the Luancheng Experimental Station of Chinese Academy of Science to study the effects of deficit irrigation regimes on the photosynthetic active radiation (PAR), biomass accumulation, grain yield, and RUE of winter wheat. In this experiment, field experiment involving winter wheat with 1, 2 and 3 irrigation applications at sowing, jointing, or heading stages was conducted, and total irrigation water was all controlled at 120 mm. The results indicate that irrigation 2 or 3 times could help to increase the PAR capture ratio in the later growing season of winter wheat; this result was mainly due to the changes in the vertical distributions of leaf area index (LAI) and a significant increase of the LAI at 0-20 cm above the ground surface (LSD, P < 0.05). Compared with irrigation only once during the growing season of winter wheat, irrigation 2 times significantly (LSD, P < 0.05) increased aboveground dry matter at maturity; irrigation at sowing and heading or jointing and heading stages significantly (LSD, P < 0.05) improved the grain yield, and irrigation at jointing and heading stages provided the highest RUE (0.56 g/mol). Combining the grain yield and RUE, it can be concluded that irrigation at jointing and heading stages has higher grain yield and RUE, which will offer a sound measurement for developing deficit irrigation regimes in North China.
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Claims 6
Claim · model-written summary
Irrigating two or three times increased late-season PAR capture.
- Taxon
- winter wheat
Triticum aestivume0 - Treatment
- irrigation 2 or 3 timese0
- Outcome
- PAR capture ratioe0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation 2 or 3 times could help to increase the PAR capture ratio in the later growing season of winter wheat”
t0“winter wheat”
Claim · model-written summary
Irrigation increased lower-canopy LAI.
- Taxon
- winter wheatTriticum aestivumt0
- Organ / stage
- 0-20 cm above the ground surfacee0
- Outcome
- LAIe0
- Direction
- increasee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant increase of the LAI at 0-20 cm above the ground surface (LSD, P < 0.05)”
t0“winter wheat”
Claim · model-written summary
Two irrigations increased aboveground dry matter at maturity.
- Taxon
- winter wheatTriticum aestivume0
- Treatment
- irrigation 2 timese0
- Outcome
- aboveground dry matter at maturitye0
- Direction
- increasede0
- Comparator
- irrigation only oncee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Compared with irrigation only once during the growing season of winter wheat, irrigation 2 times significantly (LSD, P < 0.05) increased aboveground dry matter at maturity”
t0“winter wheat”
Claim · model-written summary
Irrigation at sowing and heading improved grain yield.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- irrigation at sowing and headinge0
- Outcome
- grain yielde0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation at sowing and heading or jointing and heading stages significantly (LSD, P < 0.05) improved the grain yield”
t0“winter wheat”
Claim · model-written summary
Irrigation at jointing and heading improved grain yield.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- jointing and heading stagese0
- Outcome
- grain yielde0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation at sowing and heading or jointing and heading stages significantly (LSD, P < 0.05) improved the grain yield”
t0“winter wheat”
Claim · model-written summary
Jointing and heading irrigation gave the highest RUE, 0.56 g/mol.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- irrigation at jointing and heading stagese0
- Outcome
- RUEe0
- Direction
- higheste0
- Value
- 0.56 g/mole0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation at jointing and heading stages provided the highest RUE (0.56 g/mol)”
t0“winter wheat”
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