Deficit drip irrigation based on crop evapotranspiration and precipitation forecast improves water- use efficiency and grain yield of summer maize.
J Sci Food Agric
; 102(2): 653-663, 2022 Jan 30.
Article
en En
| MEDLINE
| ID: mdl-34146410
ABSTRACT
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) but there was insignificant difference in Pn value (P > 0.05). The ∆T between 1200-1400 of DI and FI was significantly lower than that of CK at jointing stage in 2018 and grain-filling stage in 2019 (P < 0.05). The 2-year average grain yields of DI and FI were 11.4 and 11.5 t ha-1 , which increased by 32.4% and 32.8% compared with CK, respectively. The WUE of DI was 2.82 kg m-3 , which was 17.9% and 33.8% higher than that of FI and CK, respectively.CONCLUSION:
Deficit drip irrigation based on crop evapotranspiration and precipitation forecast improves crop WUE and maintains high grain yields in semi-arid and semi-humid regions. © 2021 Society of Chemical Industry.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Agua
/
Transpiración de Plantas
/
Zea mays
/
Riego Agrícola
Tipo de estudio:
Evaluation_studies
Idioma:
En
Revista:
J Sci Food Agric
Año:
2022
Tipo del documento:
Article
País de afiliación:
China