Analytical derivation of optimal irrigation water depth for efficient irrigation scheduling

Optimal irrigation water depth is a crucial parameter in irrigation engineering, often referred to as root zone depth. It is typically assumed to lie between 1 and 1.5 m below the ground surface, depending on the crop and soil types as well as the practitioner’s skill and experience. This approach c...

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Veröffentlicht in:Environmental monitoring and assessment 2024-10, Vol.196 (10), p.960, Article 960
Hauptverfasser: Sharma, Damodar, Mishra, S. K., Pandey, R. P.
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Pandey, R. P.
description Optimal irrigation water depth is a crucial parameter in irrigation engineering, often referred to as root zone depth. It is typically assumed to lie between 1 and 1.5 m below the ground surface, depending on the crop and soil types as well as the practitioner’s skill and experience. This approach can lead to inefficient irrigation scheduling. Coupling Richards’ equation with the Soil Conservation Service Curve Number (SCS-CN) concept and using the three-phase diagram of soil column widely used in geotechnical engineering, this paper suggests an analytical expression for optimal irrigation water depth providing the maximum storage capacity of a soil depending on its hydraulic/storage properties. The results for winter wheat crop in different hydrologic soil groups show that the use of the proposed concept can lead to savings of 71.79% and 57.69% of irrigation water in sandy soils (HSG-A) compared to that used in traditional irrigation considering lump-sum 1.5 m and 1 m optimal irrigation water depths, respectively. In the case of silty loam soils (HSG-C), these savings can assume 52.42% and 28.62%, respectively. The proposed relation can also be of great help in volumetric assessment of field capacity, moisture content, maximum water storage capacity (of different agricultural soils), and avoiding the issue of waterlogging that may arise from over-irrigation and thus is useful in efficient irrigation scheduling as well as in sustainable agricultural water management.
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subjects Agricultural land
Agricultural management
Atmospheric Protection/Air Quality Control/Air Pollution
Cereal crops
Earth and Environmental Science
Ecology
Ecotoxicology
Environment
Environmental Management
Field capacity
Geotechnical engineering
Irrigation
Irrigation efficiency
Irrigation engineering
Irrigation scheduling
Irrigation water
Loam soils
Moisture content
Monitoring/Environmental Analysis
Phase diagrams
Root zone
Sandy soils
Silt loam
Soil analysis
Soil columns
Soil conservation
Soil moisture
Soil properties
Soil types
Soil water storage
Storage capacity
Storage conditions
Sustainable agriculture
Water content
Water depth
Water management
Water storage
Waterlogging
Wheat
Winter wheat
title Analytical derivation of optimal irrigation water depth for efficient irrigation scheduling
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