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Irrigation Scheduling of Walnut Seedlings Using HYDRUS-1D and Taguchi Optimization Approach by Ashkan Tehrani; Ali Naghi Ziaei; Seyed Mohammadreza Naghedifar is a Engineering article available to read on EtoBox.

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Water management of seedling cultivation in nurseries necessitates proper irrigation scheduling, especially in arid and semiarid regions that cope with water shortage. To this end, triggered irrigation scheduling of walnut seedlings in a field nursery was performed using the HYDRUS-1D model and Taguchi optimization approach. Soil moisture content variation and canopy cover (CC) development were monitored in the study field by a profile probe (PR2 sensor) and aerial-view images, respectively. Cross-validation technique was performed in order to calibrate and validate the HYDRUS-1D model. Two sets of combinations comprised of four and five factors with five levels for each were designed to represent 256 and 3,125 different scenarios, respectively, for optimizing triggered irrigation using the Taguchi method. An objective function equal to the sum of irrigation efficiency (IE) and normalized transpiration (NT) was considered to maximize using the Taguchi optimization process. Results of the cross-validation technique showed a reasonable agreement between measured and simulated data [root-mean-square error ðRMSEÞ 1⁄4 0.025 m 3 m -3 , mean absolute error ðMAEÞ 1⁄4 0.018 m 3 m -3 , and N

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Author

Ashkan Tehrani; Ali Naghi Ziaei; Seyed Mohammadreza Naghedifar

Published

2023

Language

EN

Field

Engineering (Physical Sciences)