Functional evaluation of pedotransfer functions in irrigation scheduling

 
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Functional evaluation of pedotransfer functions in irrigation scheduling

Georgousis, Charalampos
Moussouliotis, A.
Babajimopoulos, Christos

Computer simulation of the complex soil-plant-atmosphere continuum, has been proven to be an effective process in addressing environmental problems. A major drawback is the requirement of a substantial amount of input data. In addition to that, many inputs, such as the soil hydraulic properties, are both extremely variable in space and time and time consuming to obtain [1,2], thus the cost of field data collection is significantly raised. Although indirect estimation of soil hydraulic properties by pedotransfer functions (PTFs) [3], seems to be an alternative solution to field data collection, the effects of using PTFs on soil water balance simulation are not often examined. This paper attempts to provide an insight on the efficiency of PTFs to correctly describe the soil water content variations of a cropped field, as well as on how they affect irrigation scheduling. For this purpose, field data from two different crops (sugarbeet and cotton) and PTFs suggested by [4] are used. Simulations were carried out using the SWBACROS model [5,6]. Comparison between SMCs constructed with PTFs and SMCs determined in the laboratory revealed that, differences may exist anywhere in the pressure range between 0.1m to 150.0m, but significant differences were found in only one case (0-50cm layer of the sugarbeet field). The use of PTFs in general overestimated observed soil water content. Higher discrepancies were observed at the top soil layers, which are diminishing in deeper layers. Irrigation scheduling based on PTFs, was clearly affected by the aforementioned discrepancies. By continuously predicting higher soil water contents, PTFs reduced the total number of irrigation events and total irrigation depth. With pedotransfer functions being an such attractive alternative to field data collection, further research should be made in order to obtain more reliable results when PTFs are used. Although indirect estimation of soil hydraulic properties by pedotransfer functions (PTFs) [3], seems to be an alternative solution to field data collection, the effects of using PTFs on soil water balance simulation are not often examined. This paper attempts to provide an insight on the efficiency of PTFs to correctly describe the soil water content variations of a cropped field, as well as on how they affect irrigation scheduling. For this purpose, field data from two different crops (sugarbeet and cotton) and PTFs suggested by [4] are used. Simulations were carried out using the SWBACROS model [5,6]. Comparison between SMCs constructed with PTFs and SMCs determined in the laboratory revealed that, differences may exist anywhere in the pressure range between 0.1m to 150.0m, but significant differences were found in only one case (0-50cm layer of the sugarbeet field). The use of PTFs in general overestimated observed soil water content. Higher discrepancies were observed at the top soil layers, which are diminishing in deeper layers. Irrigation scheduling based on PTFs, was clearly affected by the aforementioned discrepancies. By continuously predicting higher soil water contents, PTFs reduced the total number of irrigation events and total irrigation depth. With pedotransfer functions being an such attractive alternative to field data collection, further research should be made in order to obtain more reliable results when PTFs are used.

Conference / Συνέδριο
info:eu-repo/semantics/conferenceObject

Irrigation scheduling functional evaluation
SWBACROS
Υδραυλικές ιδιότητες του εδάφους
Προγραμματισμός των αρδεύσεων
Πεδοσυναρτήσεις
Pedotransfer functions soil hydraulic properties
Λειτουργική αξιολόγηση

Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης (EL)
Aristotle University of Thessaloniki (EN)

2009
2009-09-11T12:23:00Z


Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης, Σχολή Γεωπονίας, Δασολογίας και Φυσικού Περιβάλλοντος, Τμήμα Γεωπονίας

Proceedings of the First International Conference on Soft Computing Technology in Civil, Structural and Environmental Engineering, [2009] p.1-14 [Published Version]

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info:eu-repo/semantics/openAccess



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