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Sustainable irrigation based on co-regulation of soil water supply and atmospheric evaporative demand.

ABSTRACT: Irrigation is an important adaptation to reduce crop yield loss due to water stress from both soil water deficit (low soil moisture) and atmospheric aridity (high vapor pressure deficit, VPD). Traditionally, irrigation has primarily focused on soil water deficit. Observational evidence demonstrates that stomatal conductance is co-regulated by soil moisture and VPD from water supply and demand aspects. Here we use a validated hydraulically-driven ecosystem model to reproduce the co-regulation pattern. Specifically, we propose a plant-centric irrigation scheme considering water supply-demand dynamics (SDD), and compare it with soil-moisture-based irrigation scheme (management allowable depletion, MAD) for continuous maize cropping systems in Nebraska, United States. We find that, under current climate conditions, the plant-centric SDD irrigation scheme combining soil moisture and VPD, could significantly reduce irrigation water use (-24.0%) while maintaining crop yields, and increase economic profits (+11.2%) and irrigation water productivity (+25.2%) compared with MAD, thus SDD could significantly improve water sustainability.

SUBMITTER: Zhang J

PROVIDER: S-EPMC8452748 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature

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Sustainable irrigation based on co-regulation of soil water supply and atmospheric evaporative demand.

Zhang Jingwen J Guan Kaiyu K Peng Bin B Pan Ming M Zhou Wang W Jiang Chongya C Kimm Hyungsuk H Franz Trenton E TE Grant Robert F RF Yang Yi Y Rudnick Daran R DR Heeren Derek M DM Suyker Andrew E AE Bauerle William L WL Miner Grace L GL

Nature communications 20210920 1

Irrigation is an important adaptation to reduce crop yield loss due to water stress from both soil water deficit (low soil moisture) and atmospheric aridity (high vapor pressure deficit, VPD). Traditionally, irrigation has primarily focused on soil water deficit. Observational evidence demonstrates that stomatal conductance is co-regulated by soil moisture and VPD from water supply and demand aspects. Here we use a validated hydraulically-driven ecosystem model to reproduce the co-regulation pat ...[more]

PMID: 34545076

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Dataset Information

Sustainable irrigation based on co-regulation of soil water supply and atmospheric evaporative demand.

Publications

Sustainable irrigation based on co-regulation of soil water supply and atmospheric evaporative demand.

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