Effect of Spraying Washington Navel Orange Trees With Selenium on Vegetative Growth, Productivity and Fruit Quality

Abstract

This study was carried out during two successive seasons, 2012 and 2013 in a private orchard in Barshom vallage located at El-Kalubia Governorate Egypt. Washington Navel Orange trees (Citrus Sinensis) budded on sour orange rootstock (Citrus aurantium, L.) were 7-years-old and planted at 5 x 5 meters under basin irrigation system. This investigation aimed to study the effect of selenium (Se) levels (0, 20, 40, 80 and 160 ppm) as foliar spray on growth, yield, fruit quality, leaf mineral content and enzymes activity of Washington Navel orange trees. The obtained data showed that, selenium had a significant promotive effect on growth, yield, fruit quality, leaf mineral content and enzymes activity of Washington Navel orange trees. Results indicated that treatment of Se at 40 ppm gave the highest significant results, whereas, treatment 160 ppm gave the highest fruit selenium content.

Pomegranate trees quality under drought conditions using potassium silicate, nanosilver, and selenium spray with valorization of peels as fungicide extracts

“…Besides, treating “Zaghlol” date palm with Se increased the fruit weight 90 . Spraying Citrus Sinensis trees with Se at 0, 20, 40, 80 and 160 ppm improved markedly pulp weight and thickness, as well as fruit diameter, height and volume and 40 ppm was the predominant one 69 . Spraying apple trees with Se at 0.5, 1, and 1.5 mg/L twice during the enlargement fruit period increased the flesh fruit firmness 91 .…”

“…Small dose of Se can induces the growth of plant, increases the process of photosynthesis and helps in the balance of the necessary nutrient elements 70 . Foliar application of orange trees by Se at 0, 20, 40, 80 and 160 ppm raised the growth, yield, fruit quality attributes, leaf mineral content and enzymes activity, and the concentration of 40 ppm was the best results compared with the rest applied treatments 69 . The application of selenium at five different concentrations at 0, 10, 20, 40, and 80 mg L −1 on four different olive cultivars: “San Felice”, “Canino”, “Frantoio”, and “Moraiolo”.…”

“…Low dose of Se can help in the balance of the necessary nutrient elements in the plants 5 , 70 . Spraying Citrus Sinensis with Se at 20, 40, 80 and 160 ppm improved obviously potassium, nitrogen and phosphorus concentration in the leaves with the respect of control and 40 ppm was the supreme one 69 .The application of nano fertilizers can help the translocation process of nutrients to the desired parts of plant 108 . Nano fertilizers greatly enhanced the uptake of NPK nutrients, which play an important role in increasing the growth, chlorophyll content and yield of wheat 80 .…”

“…Additionally, Se acts as an anti-senescent and has the ability to improve growth and developing of plants 92 , 93 . Furthermore, it was found that the foliar spraying of 0, 20, 40, 80 and 160 ppm Se on ‘Washington Navel’ orange trees improved significantly the obtained yield, and the best results were noticed with the usage of 40 ppm 69 .…”

“…Selenium plays a crucial role in physiological processes and in improving the growth parameters of orange 68 . reported that the foliar spraying of “Washington” navel orange by selenium at 0, 20, 40, 80 and 160 ppm improved significantly the shoot number, length, secondary shoots, leaf number per shoot and leaf surface area compared with control 69 . Small dose of Se can induces the growth of plant, increases the process of photosynthesis and helps in the balance of the necessary nutrient elements 70 .…”