Sunburn and heat-related stresses

Farmers have to face increasingly difficult technical and agronomical challenges and have to balance needs that seem hardly compatible at first.
The observance of high qualitative standards, sudden climate changes and the constantly greater attention of the consumers towards integrated and/or organic productions are only some of the demands that farmers must be able to meet.

In this period, sunburn damage on grapes, fruits and vegetables occurs more and more frequently.

If, on one hand, the albedo is fundamental for the correct vegetal-productive development of the plants, on the other hand, an excessively intense irradiation, combined with high temperatures, causes sunburns, with burns that initially look like mushy colourless stains and that, after a few days, take on a paper-like consistency and lead to darkening and to the necrosis of the epidermis.
Temperatures above 48°C of the section of the fruit exposed to the sun cause the thermal death of the cells of the leaf mesophyll and the subsequent necrosis of the tissues.

In combination with a balanced and correct mineral nutrition of the crops, from the beginning of veraison, when the exocarp of the fruits starts becoming more tender and more subjected to abiotic stresses, we suggest treating the crops alternatively on a weekly basis with Foliacon 22 with a 2 l/ha dosis and Silvest with a 3 l/ha dosis, in order to effectively counter the damage caused by sunburn.

Foliacon 22 is a fertilizer of high purity which allows for the simultaneous administration of calcium and magnesium in a 2:1 ratio, the most natural one for plants, even in the most difficult conditions caused by water imbalances and environmental stresses. The two mesoelements act synergically as osmocontrollers and water regulators, contributing to the thickening of the cell walls formed by pectates of calcium and magnesium, and increasing the photosynthetic efficiency.

Silvest is a formula containing readily-assimilable silicium. The product increases the mechanic resistance of the cell walls of the leaves and fruits and the resistance to abiotic stresses, reducing the transpiration and thus the water loss of the plant. The presence of silicium induces a higher translocation of Ca and Mg inside the fruits, bringing an increase of resistance to thermal stresses and to the cracking phenomenon. Further, the silicic source in the formula, thanks to the refraction ability of the solar spectrum, reduces the temperature of the exocarp, therefore limiting sunburn damage.
In order to maximise the efficacy of the interventions, we suggest to acidify the irrorated solution, bringing it to a pH between 5,5 and 6 and we suggest to carry out the interventions before the air temperature exceeds 28°C.

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