Effect of Some Treatments on Reducing Sunburn in Wonderful Pomegranate Fruit Trees

Document Type : Original Article


 THIS study was carried out during two successive seasons of 2011 and 2012 in order to study the effect of spraying purshade at (2, 4 %), Ca(OH)2 at (1, 2 %) and Kaolin at (2, 4 %) on reducing fruit sunburn of three years old Wonderful pomegranate (Punica granatum L.) trees grown in sandy soil of private farm at Alexandria desert road, Egypt. All experimental trees were sprayed twice (21 days after fruit set and one month later) in each season. Results showed that, Kaolin at 2 % significantly increased fruit weight (g), yield (Kg/tree) and non-edible part (%) as compared with the control and the other treatments. Meanwhile, Kaolin application at 4 % led to a marked reduction in cracked and sunburned fruits, increasing the marketable fruits. Also, treatment with Kaolin at 4 % increased fruit chemical contents (TSS, TSS/acidity, vitamin C, anthocyanin pigment and total sugars) and redness fruit as compared to the other treatments. While, Ca (OH)2 at 2 % caused a significant increase in fruit length and diameter (cm). In addition, Purshade at 4 % caused the highest increase in fruit edible part (%) and acidity (%).Generally, all treatments were effective in reducing the percentage of Wonderful pomegranate fruit sunburn. In addition, the treatment of Kaolin at 4 % was more effective than the other treatments under the experimental conditions.