Author(s):

G Nissi Flora, J Dilip Babu, L Mukunda Lakshmi, DV Swami and Dr. Salomi Suneetha

Abstract: Sunburn is a major problem caused by caused by climate change i.e. high temperature and direct solar radiation, which leads to significant economic losses in sweet orange yield. So, a field experiment was conducted on ambe bahar crop of 2018 and 2019 in two locations, to study the effect of foliar application of antitranspirants twice in a month from March to June on transpiration rate and photosynthetic index of ‘Sathgudi’ sweet orange trees. The obtained results showed that, foliar application of antitranspirants was effective to control fruit drop due to sunburn as compared to fruits from trees applied with 1% urea and 2% quick lime. Moreover, foliar application of liquid paraffin @ 2% has decreased rate of transpiration and increased the water use efficiency. Spray of salicylic acid @ 500 ppm reduced stomatal density and cycocel @ 2000 ppm has highest rate of photosynthesis. Therefore, it could be recommended that, spraying antitranspirants twice in summer months had a positive impact on preventing fruit sunburn damage and improved the yield and fruit quality of sweet orange.

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