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Sharma, Shashi K.
- Use of Thermal Hysteresis Inducing Chemicals for Frost Protection in Subtropical Fruit Plants
Authors
1 Horticultural Research Station (Dr. Y.S.P.U.H&F.), Seobagh, Kullu (H.P.), IN
Source
The Asian Journal of Horticulture, Vol 11, No 2 (2016), Pagination: 306-312Abstract
Frost induced freeze damage is the severest environmental stress faced by the subtropical plant species worldwide. Controlled environmental studies were conducted at Institute of Biotechnology and Environmental Science Neri for using thermal hysteresis inducing chemicals as a tool for managing this stress in highly sensitive, medium sensitive and least sensitive subtropical fruit species. Foliar mist of 5 per cent 1, 2-Propanediol was found most effective treatment in reducing the relative electrolyte leakage in the experimental plants. Ingression of this chemical into plant system through hydrogel application in the effective ischolar_main zone was found to give prolonged protection against frost.
Keywords
Mango, Papaya, Freeze Initiation, Low Temperature Stress, Freeze Restriction, Ice Nucleation, Hydrogel.
- Effect of Surface Wetness and Duration of Low Temperature Exposure on Frost Damage in Sub-tropical Fruit Species
Authors
1 College of Horticulture and Forestry (Dr. Y.S. Parmar University of Horticulture and Forestry), Khagal, Hamirpur (H.P.), IN
Source
The Asian Journal of Horticulture, Vol 10, No 2 (2015), Pagination: 272-277Abstract
Frost is the most devastating weather hazard for horticultural growth in the NW India. For mitigation of its impact the information on the process of freeze initiation a spread and the factors involved in aggravating the damage is of utmost importance. Studies were conducted at COHF Neri under controlled and radiation frost customized environment. REL was the measure adopted for accessing the damage. Two leaf surface wetness levels (wet and dry) along with three durations of low temperature (-20C) exposure 2 hours, 4 hours and 6 hours were taken under a Completely Randomized Factorial experiment conducted on container grown ten subtropical fruit species. Leaf surface wetness was more critical in case of mango and litchi whereas in case guava, jamun, karonda, galgal, lime extrinsic ice nucleation was not very important in inducing internal damage to the leaf tissues. Duration of low temperature exposure aggravated the damage level in almost all the species. In case of papaya and jackfruit higher susceptibility of these species to frost induced freeze damage the impact of frost duration was not found to be significant. The relative order off susceptibility of different species was observed to be as: Loquat, galgal, lime, guava, karonda, jamun, litchi, mango, jackfruit, papaya in the increasing order.