Last Frost Index of Seed-calabash in Hetao Irrigation District

doi:10.11924/j.issn.1000-6850.casb17020110

Abstract

Abstract: The paper aims to better develop the meteorological service for last frost on seed-calabash, the authors chose seed-calabash variety‘Fengchan No.1’as material, simulated the natural frost cooling process by using the MSX-2F artificial frost box system, and detected the frostbite and death statistics by measuring leaf temperature with the thermocouple probe. Combining the changes in fluorescence, the authors preliminarily established the meteorological index of last frost of seed-calabash. The results showed that: (1) the minimum temperature for seed-calabash seedlings’freeze to death was ≤-4℃; (2) the freezing point of seed-calabash was in the range of -0.2℃- -2.8℃, the super cooling point concentrated in the range of - 1.5℃- -4.5℃; (3) the seed-calabash with relatively large seedling age had a stronger cold-resistance; (4) the land surface temperature index of light frost and heavy frost on seed-calabash seedlings was -1℃ and -3℃, respectively.

CLC Number:

S166

References

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