Deficit drip irrigation based on crop evapotranspiration and precipitation forecast improves water‐ use efficiency and grain yield of summer maize

BACKGROUND Limited and erratic precipitation with inefficient irrigation scheduling often leads to an unstable crop yield and low water‐use efficiency (WUE) in semi‐arid and semi‐humid regions. A 2‐year field experiment was conducted to evaluate the effect of three irrigation strategies (conventiona...

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Bibliographic Details
Published in:Journal of the science of food and agriculture 2022-01, Vol.102 (2), p.653-663
Main Authors: Lu, Junsheng, Ma, Lihui, Hu, Tiantian, Geng, Chenming, Yan, Shicheng
Format: Article
Language:English
Subjects:
Agricultural Irrigation - instrumentation
Agricultural Irrigation - methods
Agricultural production
Air temperature
Arid regions
Chemical precipitation
Corn
Crop yield
Crops
Drip irrigation
drought stress
Evapotranspiration
Grain
Irrigation
Irrigation scheduling
irrigation strategy
Jointing
leaf‐to‐air temperature difference
Photosynthesis
photosynthetic rate
Plant Leaves - growth & development
Plant Leaves - metabolism
Plant Transpiration
Seasons
Summer
Transpiration
transpiration rate
Water - analysis
Water - metabolism
Weather forecasting
Zea mays - growth & development
Zea mays - physiology
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Summary:BACKGROUND Limited and erratic precipitation with inefficient irrigation scheduling often leads to an unstable crop yield and low water‐use efficiency (WUE) in semi‐arid and semi‐humid regions. A 2‐year field experiment was conducted to evaluate the effect of three irrigation strategies (conventional irrigation (CK), full‐drip irrigation (FI), based on crop evapotranspiration and precipitation forecast, and deficit drip irrigation (DI) (75% FI)) on photosynthetic characteristics, leaf‐to‐air temperature difference (∆T), grain yield, and the WUE of summer maize. RESULTS The results showed that the daily average net photosynthetic rate (Pn) of DI and FI increased by 25.4% and 25.8% at jointing stage in 2018, and 26.3% and 26.5% at grain‐filling stage in 2019 compared with CK, respectively. At jointing stage in 2018 and grain‐filling stage in 2019, the transpiration rate (Tr) of DI was significantly lower than that of FI (P  0.05). The ∆T between 12:00–14:00 of DI and FI was significantly lower than that of CK at jointing stage in 2018 and grain‐filling stage in 2019 (P 
ISSN:0022-5142
1097-0010
DOI:10.1002/jsfa.11394