Mapping and analyzing the risk of frost and chilling damage on horticultural crops (study case: Taftan border area, Southeast of Iran)

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Research Paper 01/08/2015
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Mapping and analyzing the risk of frost and chilling damage on horticultural crops (study case: Taftan border area, Southeast of Iran)

Behrooz Kordi Tamandani, Dr. Mahmood Khosravi, Dr. Payman Mahmoodi
J. Bio. Env. Sci.7( 2), 261-275, August 2015.
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Frosts have obvious effects on the energy, transport, and agriculture, while their greatest impact is on agriculture. Since chilling and frost cause’s lots of damage to crops in Taftan area, it is essential to examine the chilling and frost in this area. To study this phenomenon in Taftan area, the minimum temperature data of 4 synoptic stations (Zahedan, Khash, Nosratabad, Mirjaveh) and 4 climatology stations (Goharkouh, Karvandar, Cheshme ziarat, and Korin) were used. Early autumn and late spring frost dates at the desired thresholds (zero and lower) for chilling, and temperatures of 1.1, 2.2, 3.3, 4.4 ° C for frost damage were extracted, and duration, frequency of frost and chilling days and the growing season was calculated. Then, determining the appropriate probability distribution, the probability of early and late, chilling and frost was estimated. After examining the relationship between chilling and elevation, zoning maps were drawn by using the geographical information system (GIS), and finally using the Spearman correlation method, the relationship between chilling and frost and horticultural crops was analyzed. The results showed that the earliest autumn chilling and the latest spring chilling occur in Taftan mountains, and the latest autumn chilling and earliest spring chilling occur in the West and Southeast regions. The analysis and interpretation of the results also showed that spring chilling has the greatest impact on horticultural crops such as apricot, almond, and cherry. The relationship between the yield of horticultural crops and late chilling indicated that only horticultural crops at Taftan mountain border have suffered from frost damage.


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