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- Title
Water use characteristics of an early and late maturing maize hybrid using stable isotopes.
- Authors
Wang, Lei; Chen, Jing; Ren, Baizhao; Zhao, Bin; Liu, Peng; Dong, Shuting; Zhang, Jiwang
- Abstract
Water requirements of early‐maturing (EM) maize hybrids might be lower than those of late‐maturing (LM) maize hybrids. This study aimed to analyze the effects of different irrigation management on grain yield (GY), water uptake patterns, evaporation (E), and transpiration (T) of two maize hybrids differing in maturity via stable isotope method. The field experiment with 36 lysimeters (4‐m wide × 4‐m long) under rain‐shelters was conducted with an EM (DH518) and a mid‐maturing and LM (DH605) hybrid with three replicates from 2021 to 2022. Maize plants were grown under three irrigation amounts (W1, W2, and W3 were irrigated to maintain soil moisture at 45%, 60%, and 75% of field capacity, respectively) by flood irrigation (FI) and drip irrigation (DI) under rain‐out shelters. Results showed that GY and evapotranspiration (ET) of EM were 8% and 12% lower, while the crop water productivity (CWP) was 6% higher than that of LM. Water uptake of both hybrids occurred mainly within 0‐ to 60‐cm soil layer during the vegetative stage. Water uptake of both hybrids occurred mainly within 0‐ to 60‐cm soil layer during the vegetative stage. Summer maize under FI absorbed more water from the deep soil layer than DI in the late growth stage. Compared with LM, the water absorption depth of EM became shallower in the late growth stage. Water uptake of maize was mainly from the deeper soil under water stress conditions. E of total ET accounts for 43% under DI and 57% under FI; GY and CWP were 22% and 51% higher than those of FI. Together with choosing EM hybrids, optimization of water management with DIW3 could achieve higher GY and CWP. The optimization of irrigation method and hybrids could provide a reference for local farmers to improve GY and CWP. Core Ideas: An IsoSource model effectively determined seasonal change in water‐uptake patterns for different maize genotypes.The stable isotope technique could be an effective method to partition evaporation and transpiration.The main water absorption depth of maize changed greatly over the growth period and was affected by irrigation.The early‐maturing hybrid obtained higher crop water productivity and absorbed water from the shallower soil layer.Evaporation of total evapotranspiration accounts for 43% under drip irrigation and 57% under flood irrigation.
- Subjects
STABLE isotopes; WATER use; MICROIRRIGATION; IRRIGATION management; WATER management
- Publication
Agronomy Journal, 2024, Vol 116, Issue 2, p661
- ISSN
0002-1962
- Publication type
Article
- DOI
10.1002/agj2.21515