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Agroclimatic zoning of Azarbayjan-Sharghi province for rainfed almond using GIS
Post graduate student, Teacher Training University, Tehran,Iran,
Khalili-A, Hajam-S, Kamali-G Vezvai A
Dep. of Irrigation, Agricultural faculty, Tehran University,Iran
Limitations in soil and water resources together with irregular rate of population increasing , cause that we choose a usefull landuse in our available resources.
In order to do this,climatic investigations are necessory.The objective of this study was classification of Azarbaijan Sharghi Province in aspect of climatic potential of Almond in dryland farming.For this purpose ,the precipitation and evaporation data as well as temperature paramameters of ten meteorological stations of area were collected and analysed.Following indices were selected for Almond in dryland farming:
For each of above parameters a coverage layer was prepared in GIS environment,in the second stage five mentioned coverage layers were crossed and overlapped to obtaining the agroclimatic map of area .Finally agroclimatic map reclassed to highly favorable,favorable,weak and not suitable area.
- Probability of chilling occurrence on bud and flower of Almond
- Probablity of rainfall greater than 250mm
- Spring and summer precipitation to annual precipitation ratio
- Probablity of occurrence of growing degree days greater than
3500 G.D.D (base temperature 0 celsius)
- Amount of available moisture index
Precision farming aims to optimize the use of natural resources. Geographical information systems (GIS) are systems for the storage, analysis and presentation of spatial data. A combination of GIS and simulation models is highly relevant for precision farming.Agroclimatic classifications have proved to be of great utility for planning and management of various agricultural and forestry activities.
Several climatic conditions may affect annual yield of deciduous fruit trees.Air temperature and rainfall are the most important climatic factors for grown and development of plant species.
The objective of present work is to use GIS, along with the model obtained, to find suitable areas for rainfed Almond.
Fig. (2-1): Geographical distributon of elevation in area
Material and methods
Azarbaijan sharghi with 45480 Km2 area is one of the northwest provinces of Iran. Daily mean ,maximum and minimum temperature data and evapotranspiration as well as precipitation information were obtained from the synoptic and climatic stations of the area for a 25 year period(1971-1995) (Table 2-1).The phenological (flowering date) and effective rainfall data also were collected from ministry of Agriculture for the same period.
Fig. (2-2): POAP map of Azarbaijan shargi province