Effect of Kaolin Foliar on Fruit Sunburn, Yield and Fruit Quality of Persimmon Trees

Abstract

A field experiment was conducted during 2016 and 2017 seasons at a private orchard situated in Abu El-Matamir destrict, El-Behaira governorate, Egypt, to study the effect of foliar spray of 0, 2, 3 and 4% kaolin, twice or three times in June, July and August on vegetative growth, nutritional status, sunburn percentage, yield and fruit quality of" Costata" persimmon trees. The obtained results showed that, kaolin foliar application at 4% twice or three times (T 6 and T 7 ) considered the best treatments for enhance improvement nutritional status of trees. Moreover, kaolin foliar applications were effective to control fruit sunburn % as well as reducing severity percentage of sunburned fruits as compared to untreated trees. Also, Kaolin foliar application at three times was decreased leaf and fruit surface temperature especially under 3 and 4%. concentrations. In addition, kaolin treatments increased yield and improved fruit quality in terms of fruit weight, size, height, and diameter as well as fruit firmness. Kaolin foliar spray was raising fruit values of SSC%, and SSC/acid ratio compared to the control, whereas there is no significant variation among kaolin concentrations on this variables. Therefore, it could be recommended that, spraying kaolin at 4% three times in summer months, improving increasing gave the best result for improving trees nutritional status, and also it had a positive effect on preventing fruit sunburn damage and increasment yield and fruit quality of " Costata" persimmon trees.

Growth, Productivity and Quality Performance of Costata Persimmon in Relation to Canopy Position and Rootstock

“…Three types of sunburn induced by heat and/or light stress in apples were reported and characterized by Schrader et al (2008). Intense exposure of persimmon fruit to sunlight causes sunburn damage appearing as large black spots on the fruit skin, which render the fruit marketability and cause high losses in yield (Abo Ogiela, 2020). In our study, the lowest percentage of fruit sunburn was recorded at the canopy inner side, and at the lower part as well as at the north and east directions.…”

Kaolin particle film mitigates supra-optimal temperature stress effects at leaf scale and increases bean size and productivity of Coffea canephora

“…KF has been widely used to attenuate the deleterious effects of high solar irradiance (Steiman et al, 2007) and high temperatures (Abreu et al, 2022). The combination of high solar irradiance and elevated temperatures causes physiological disorder called sunburn (Abo Ogiela, 2020), especially due to UV bands (Santos et al, 2016). Sunburn is expressed by symptoms of chlorosis (chlorophyll degradation), reduced photosynthesis, stomatal conductance (g s ) and transpiration, and reduced growth and may lead to necrosis and death of the affected plant tissue (Racskó et al, 2010).…”

“…, 2022). The combination of high solar irradiance and elevated temperatures causes physiological disorder called sunburn (Abo Ogiela, 2020), especially due to UV bands (Santos et al. , 2016).…”