Abstract
Regulated deficit irrigation (RDI) is one irrigation strategy that can conserve irrigation water and maintain yield. In this paper, we describe an investigation of the timing and efficacy of RDI in an experiment conducted in a waterproof shed on maize in 2009. Various levels of controlled soil water deficit, here expressed as the level of moisture in 30 cm soil layers, including high moisture content (70-75%), middle content (60-65%), and low content (50-55%). Grain yield increased along with evapotranspiration (ET), but the highest level of water use efficiency (WUE) was not consistent with the maximum yield. The amount of irrigation water under deficit conditions was usually between 269.4 mm and 342.7 mm in semi-arid areas. Mild water deficit at the jointing and flowering stages increased WUE by 24.38% and 23.02%, respectively, but decreased WUE by 19.07% at the grain-filling stage. Further differences were observed at the jointing stage (P<0.05). Water consumption intensity (WCI) was used to indicate irrigation timing and degree of RDI. The results of this study indicate that mild water deficit at the jointing stage is a better regulated deficit irrigation strategy for maize in semi-arid regions than deficit at other stages. It may be the optimal irrigation method for increasing maize production in semi-arid areas.
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Claims 10
Claim · model-written summary
Maize grain yield increased with evapotranspiration.
Zea maysNot reportedSetting
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield increased along with evapotranspiration (ET)”
t0“maize”
Claim · model-written summary
The highest water-use efficiency did not coincide with maximum yield.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest level of water use efficiency (WUE) was not consistent with the maximum yield”
t0“maize”
Claim · model-written summary
Deficit-condition irrigation water was usually 269.4–342.7 mm.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The amount of irrigation water under deficit conditions was usually between 269.4 mm and 342.7 mm in semi-arid areas”
t0“maize”
Claim · model-written summary
Mild deficit at jointing raised WUE by 24.38%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild water deficit at the jointing and flowering stages increased WUE by 24.38% and 23.02%, respectively”
t0“maize”
Claim · model-written summary
Mild deficit at flowering raised WUE by 23.02%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mild water deficit at the jointing and flowering stages increased WUE by 24.38% and 23.02%, respectively”
t0“maize”
Claim · model-written summary
Mild deficit at grain filling reduced WUE by 19.07%.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased WUE by 19.07% at the grain-filling stage”
t0“maize”
Claim · model-written summary
Jointing-stage differences were statistically significant.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Further differences were observed at the jointing stage (P<0.05)”
t0“maize”
Claim · model-written summary
Water consumption intensity was used as an indicator for irrigation timing and degree.
- Outcome
- irrigation timing and degree of RDIe0
Not reportedValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water consumption intensity (WCI) was used to indicate irrigation timing and degree of RDI”
t0“maize”
Claim · model-written summary
Mild jointing-stage deficit was judged the better irrigation strategy for semi-arid maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“mild water deficit at the jointing stage is a better regulated deficit irrigation strategy for maize in semi-arid regions than deficit at other stages”
Claim · model-written summary
The authors suggest jointing-stage deficit may optimize maize production in semi-arid areas.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It may be the optimal irrigation method for increasing maize production in semi-arid areas”
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