Measurement of evapotranspiration and crop coefficient of pistachio trees in Rafsanjan region

Document Type : Original Article

Authors

1 Members of Pistachio Research Institute, Horticultural Science Research Institute (HSRI), Agricultural Research Organizations, Education and Extension Organization (AREEO), Rafsanjan, Iran

2 Ph. D. Student of Irrigation and Drainage engineering, Irrigation & Reclamation Dept. Faculty of Agriculture Engineering and Technology, University of Tehran, Karaj, Iran

3 Assistant Professor of Irrigation and Reclamation Department, Faculty of Agriculture Engineering and Technology, University of Tehran, Karaj, Iran

Abstract

Considering the significant increase of pistachio cultivation area in Iran and lack of water resources, accurate determination its water requirement is necessary. Since irrigation in the initial stages of pistachio is essential for adequate tree establishment, the main objective of this study was to measure the evapotranspiration of pistachio trees (ETc) between four to nine years of age, when the economical yields is achieved. This study was conducted in Rafsanjan Pistachio Research Institute station using a cubic concrete drainage lysimeter with  a 54 m2 surface area (6 m × 9 m) and a depth of 3.4 m. One-year old seedlings of Pistacia vera L. were cultivated inside and surrounding of the lysimeter. The amount of evapotranspiration and crop coefficient (Kc) was measured every 20-days during the eight-month growing season of pistachio using lysimeteric data. For the young trees For the young trees from four to nine years of age, the amount of seasonal evapotranspiration was 2291.2, 2507.8, 2739.4, 4516.0, 4604.0 and 5621.0 cubic meters per hectare with the mean Kc values of 0.108, 0.104, 0.15, 0.21, 0.28 and 0.33, respectively.The mean Kc coefficients of pistachio in five growth stages were determined as 0.2, 0.17, 0.22, 0.16 and 0.19, respectively.

Keywords

References

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Journal of Agricultural Meteorology
Volume 5, Issue 2 - Serial Number 10
Vol. 5, No. 2, Autumn &Winter 2017
March 2018
Pages 47-55

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