Abstract
The North China Plain(NCP)is the main winter wheat production area in China.However,grain yield of winter wheat is often threatened by drought,leading to a high risk of yield.Assessment on yield risk and study on how to reduce yield risk by appropriate irrigations could provide suitable instructions for irrigation management and increasing yield.By using the simulation model APSIM,taking Beijing and Yucheng as case study areas,yield risk of winter wheat in those two areas were evaluated firstly.Then irrigation schemes were designed and their contributions to reduce yield risk in different rainfall years were analyzed.Results indicated that in most years,rainfall could not meet the requirement of wheat,and in 30%of years water shortage reached serious degree.In serious drought years,yields of winter wheat were only 2 445 and 2 466 kg/hm 2 in Beijing and Yucheng,respectively.After irrigation,yield risk was reduced greatly,while the appropriate irrigation schemes were varied in different rainfall year types.Synthetically considering reducing yield risk and increasing water use efficiency,three irrigations are appropriate to be given in serious and medium drought years at the stage of before sowing,jointing and flowering.For light drought years,two irrigations at the stage of before sowing and jointing,respectively,are sufficient to reduce yield risk as low as possible.
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Claims 4
Claim · model-written summary
In most years, simulated rainfall could not meet the water requirement of winter wheat on the North China Plain case areas.
- Taxon
- winter wheat
Triticum aestivumt0 - Outcome
- rainfall could not meet the requirement of wheate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in most years,rainfall could not meet the requirement of wheat”
t0“winter wheat”
Claim · model-written summary
Water shortage reached a serious degree in 30% of years.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- water shortage reached serious degreee0
- Value
- 30%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in 30%of years water shortage reached serious degree”
t0“winter wheat”
Claim · model-written summary
After irrigation, simulated yield risk of winter wheat was reduced greatly.
- Taxon
- winter wheatTriticum aestivumt0
- Treatment
- irrigatione0
- Outcome
- yield riske0
- Direction
- reduced greatlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After irrigation,yield risk was reduced greatly”
t0“winter wheat”
Claim · model-written summary
Three irrigations (before sowing, jointing and flowering) are appropriate for winter wheat in serious and medium drought years.
- Taxon
- winter wheatTriticum aestivumt0
- Outcome
- three irrigations are appropriatee0
- Qualifier
- serious and medium drought yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three irrigations are appropriate to be given in serious and medium drought years at the stage of before sowing,jointing and flowering”
t0“winter wheat”
The same questions in other papers
irrigation · yield · Triticum aestivum (wheat)Positive and negative results
797 papers in the same direction as this paper · 184 in the opposite direction · 7 reporting no difference from an alternative
- negative
- no effect
- negative
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