Abstract
Abstract The availability of water imposes one of the major limits on rainfed maize ( Zea mays L.) productivity. This analysis was undertaken in an attempt to quantify the effects of limited water on maize growth and yield by extending a simple, mechanistic model in which temperature regulates crop development and intercepted solar radiation is used to calculate crop biomass accumulation. A soil water budget was incorporated into the model by accounting for inputs from rainfall and irrigation, and water use by soil evaporation and crop transpiration. The response functions of leaf area development and crop gas exchange to the soil water budget were developed from experimental studies. The model was used to interpret a range of field experiments using observed daily values of temperature, solar radiation, and rainfall or irrigation, where water deficits of varying durations developed at different stages of growth. The relative simplicity of the model and its robustness in simulating maize yields under a range of water‐availability conditions allows the model to be readily used for studies of crop performance under alternate conditions. One such study, presented here, was a yield assessment for rainfed maize under possible “greenhouse” climates where temperature and atmospheric CO 2 concentration were increased. An increase in temperature combined with decreased rainfall lowered grain yield, although the increase in crop water use efficiency associated with elevated CO 2 concentration, ameliorated the response to the greenhouse climate. Grain yields for the greenhouse climates as compared to current conditions increased, or decreased only slightly, except when the greenhouse climate was assumed to result in severely decreased rainfall.
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Claims 4
Claim · model-written summary
The model was robust in simulating maize yields across water availability conditions.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its robustness in simulating maize yields under a range of water‐availability conditions”
Claim · model-written summary
Increased temperature and decreased rainfall lowered grain yield.
- Treatment
- An increase in temperature combined with decreased rainfalle0
- Outcome
- grain yielde0
- Direction
- lowerede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An increase in temperature combined with decreased rainfall lowered grain yield”
t0“Water Deficit Effects on Maize Yields Modeled under Current and “Greenhouse” Climates”
Claim · model-written summary
Elevated CO2 ameliorated the yield response through increased crop water use efficiency.
- Compound
- CO 2e0
- Outcome
- response to the greenhouse climatee0
- Qualifier
- increase in crop water use efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the increase in crop water use efficiency associated with elevated CO 2 concentration, ameliorated the response to the greenhouse climate”
t0“Water Deficit Effects on Maize Yields Modeled under Current and “Greenhouse” Climates”
Claim · model-written summary
Under greenhouse climates grain yields increased or decreased only slightly except with severely decreased rainfall.
- Outcome
- Grain yieldse0
- Direction
- increased, or decreased only slightlye0
- Qualifier
- severely decreased rainfalle0
- Comparator
- current conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yields for the greenhouse climates as compared to current conditions increased, or decreased only slightly, except when the greenhouse climate was assumed to result in severely decreased rainfall”
t0“Water Deficit Effects on Maize Yields Modeled under Current and “Greenhouse” Climates”
The same questions in other papers
rainfall · yield · Zea mays (maize)Positive and negative results
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