Optimizing Pistachio Irrigation Management Using the Relationship between Echo-physiological Characteristics and Water Stress

Authors
N. Sedaghati 1
H. Hokmabadi 2
1 Jehad Agriculture organization, Damghan' s Pistachio Research Station, Damghan, Islamic Republic of Iran.
2 Jehad Agriculture Organization, Iran’s Pistachio Research Institute, Rafsanjan, Islamic Republic of Iran.
Abstract
In this research, some of the echo-physiological characteristics of pistachio trees were studied to understand crop response to drought stress and determine the best irrigation interval. This experiment was carried out in an orchard with a sandy loam textured soil and a commercial cultivar of pistachio named Ouhadi grafted on Pistacia vera L. rootstock for three years. The irrigation system selected was surface flooding with intervals of 30, 50, 80, and 110 days. These intervals were chosen so as to resemble common irrigation intervals of pistachio orchards in the region. This enabled a comparison between the best and worst conditions of trees in respect to drought stress. Total irrigation water received was a constant depth of water to all treatments. Quantitative and qualitative yield such as weight of fresh and dry nuts, percent of blank and split nuts, and number of nuts per ounce, vegetative and echo-physiological characteristics were considered and measured. In terms of yield quantity and quality, the results showed vegetative and echo-physiological attributes to be significantly different between the treatments of 30, 80 and 110 days irrigation intervals. This means that with an increase in irrigation intervals and considering soil water holding capacity, soils were not able to provide enough moisture for the plant to carry out its normal metabolic activities. However, in the prolonged irrigation intervals, there were not much differences between treatments i.e. the pistachio tree could adapt itself to the naturally occurring environmental stress conditions.

Keywords

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Journal of Agricultural Science and Technology
Volume 17, Issue 1
January and February 2015
Pages 189-200