Evaluation of the different levels of water supply in pistachio gardens using SEBAL algorithm (The case study of Sirjan Plain)
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Article Type:
Case Study (دارای رتبه معتبر)
Abstract:

Regarding the development trend of pistachio gardens in many provinces and the severe shortage of water resources in these areas, the supply of water requirement of pistachio is not feasible. In order to optimize management in water shortage conditions, it is necessary to evaluate the different levels of water supply during pistachio growth stages. The purpose of this study is determine the water supply status at different stages of pistachio growth using satellite images and SEBAL algorithm in Sirjan Plain. The actual evapotranspiration of pistachios was estimated using the SEBAL algorithm and Landsat 8 images. The result of this model was validated with Landsat 7 images. This model could calculate actual evapotranspiration of pistachio the same as other research with 20% error (0.6 mm/day). The results showed that supply of water in the third stage of growth (at the peak consumption) due to increased pistachio water requirement, insufficient water supply led to 30% deficit irrigation in Sirjan plain. In order to better irrigation management, production can be increased by reducing irrigation in the second stage and increasing irrigation in the third stage. The rate of deficit irrigation in the Sirjan Plain was 17% and it was in the tolerable threshold for the pistachio. The results show that the pistachio tree is resistant to deficit irrigation (up to 26%) in low salinity levels. In high water salinity (4000 μmho / cm), the effect of deficit irrigation and salinity is combined and pistachio production is rapidly reduced due to deficit irrigation.

Language:
Persian
Published:
Journal of Water and Soil Resources Conservation, Volume:9 Issue: 1, 2019
Pages:
67 to 86
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