Agroclimatic zoning of Azarbayjan-Sharghi province for rainfed almond using GIS

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Agroclimatic zoning of Azarbayjan-Sharghi province for rainfed almond using GIS

Climatic requirements of Almond
Almond (Prunus amygdalus) is one of the desicious fruits with low water requirement but very sensible flowers,buds and young fruits to chilling(Vezvai 1999).

The threshold amount of rainfall for dryland farming of Almond is annual precipitation grater than 250 mm.Not only the amount of precipitation but the distribution of it (summer and spring precipitation to annual precipitation ratio) is very important.The growing season is another factor influences the yield of almond.

Fig. (2-3): Chilling occurence probability map

The most important factor for almond planting is chilling on flowers, buds and young fruits .The threshold temperature for chilling injury is –1 degree centigrade.The above mentioned climatic parameters are the main factors that limitate almond growing specially in dryland farming.In present investigation five information layers were calculated as following:

Probability of chilling occurrence on flowers, buds and young fruits(PCO).
Probability of occurrence annual precipitation greater than 250mm(POAP)
Summer and spring precipitation to annual precipitation ratio(SSPAR).
Moisture Available Index(MAI).
Probability of occurrence of growing season greater than 3500 degree days(POGS).

Fig. (2-4): Geographical distributon map

Tab.(2-1): List of meteorological station of area

Num.	Station	Elevation(m)	Latitude	Longititude
1	Sarab	1651	37 56	47 32
2	Bostanabaf	1750	37 50	46 50
3	Mianeh	1094	37 25	47 42
4	Tabriz	1361	38 05	47 16
5	Maragheh	1420	37 24	46 16
6	Sharafkhane	1302	38 11	45 29
7	Khodaafarin	300	38 08	46 56
8	Azarshahr	1400	38 26	45 45
9	Jolfa	704	38 57	45 38
10	Ahar	1300	38 29	47 03

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