خلاصة:
The correlation coefficient of climatic factors necessary for cultivation of saffron between Sabzevar
stations and those of southem parts of Khorasan is strong. In October, no frost can be seen in Sabzevar, but it can be seen in other stations. This study showed that there was no difference in viewpoints of climatic factors in cultivation stations in both areas. Comparing the correlation coefficient of climatic factors in southem and central parts of Khorasan with Sabzevar ones, it can be said that cultivation of saffron in Sabzevar is possible. In all studied stations, all calculation factors showed high correlation coefficient (over 90%) showing temperature similarities in these areas with Sabzevar. Regarding to all studied climatic parameters, the highest correlation coefficient was related to the mean maximum temperature and the least was related to the absolute maximum temperature. Due to the high temperature in Sabzevar during the reproductive stage (phenology), the qualitative and quantitative of product is lower than product produced in southem parts of Khorasan. In Sabzevar, It is necessary for saffron to spent 25 days in order to receive daily energy.
ملخص الجهاز:
61-76, Mohammadi & Karimpour Reihan Table 4: Estimation of the date of the occurrence of the last spring freezing of the existing stations with the possibility and different return periods using the normal distribution (1987-1999) Percentage of occurrence Return period (year) Sabzevar station Qayen station Birjand 8 c 2 5 0 o 99 1,01 17 Feb. 5 Mar. 23 95 1.
Due to the fact that Saffron is one of the plants resistant to coldness and the beginning of flowering of Saffron is occurred in temperature threshold of 10 centigrade and less at night and the maximum temperature of 22 degree and less in day, the date of occurrence of the threshold of mentioned temperatures with different possibilities percentages was calculated for Sabzevar and Qayen stations.
61-76, Mohammadi & Karimpour Reihan Table 10: Estimation of the date of the end of 22 degrees and higher (maximum for the day) of the existing stations with the possibility and different return periods using the normal distribution (1987- 1999) Percentage of 1 occurrence Return period (year) 100 Sabzevar 11 station t 8c Dec. 50 10 20 50 20 10 5 2 3 29 24 14 Dec. Nov.
99 Qm=34°-21 N H=1105 Name of the station Birjand Torbate Heydariyeh Ferdows Qayen Gonabad With regard to the table 12, the rate of the correlation coefficient of each of these parameters and the climatic elements of the mean maximum temperature, the absolute minimum temperature for each of the stations of the Saffron producing regions in the south and center of Khorasan as compared with that of the target region ,i.