Identifying Within-Field Spatial and Temporal Crop Water Stress to Conserve Irrigation Resources with Variable-Rate Irrigation
| Autor: | Ruth Kerry, Bryan G. Hopkins, Neil C. Hansen, Jeffrey D. Svedin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Irrigation
crop water stress precision irrigation 0208 environmental biotechnology 02 engineering and technology Crop Water balance Spring (hydrology) Water content Hydrology geography geography.geographical_feature_category Crop yield Elevation Agriculture 04 agricultural and veterinary sciences 020801 environmental engineering soil water depletion Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Agronomy and Crop Science variable-rate irrigation soil available water holding capacity |
| Zdroj: | Agronomy, Vol 11, Iss 1377, p 1377 (2021) Agronomy Volume 11 Issue 7 |
| ISSN: | 2073-4395 |
| Popis: | Addressing within-field and within-season variability of crop water stress is critical for spatially variable irrigation. This study measures interactions between spatially variable soil properties and temporally variable crop water dynamics and whether modelling soil water depletion is an effective approach to guide variable-rate irrigation (VRI). Energy and water balance equations were used to model crop water stress at 85 locations within a 22 ha field of winter wheat (Triticum aestivum L.) under uniform and spatially variable irrigation. Significant within-field variability of soil water holding capacity (SWHC 145–360 mm 1.2 m−1), soil electrical conductivity (0.22–49 mS m−1), spring soil water (314–471 mm 1.2 m−1), and the onset of crop water stress were observed. Topographic features and modelled onset of crop water stress were significant predictors of crop yield while soil moisture at spring green-up, elevation, and soil electrical conductivity were significant predictors of the onset of crop water stress. These results show that modelling soil water depletion can be an effective scheduling tool in VRI. Irrigation zones and scheduling efforts should consider expanding to include temporally dynamic factors, including spring soil water content and the onset of crop water stress. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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