Effect of Net Shading in Improving Environmental Conditions and Reducing Fruit Cracking, Sunburn and Aril Paleness of Pomegranate Fruit cv. Rabbab
Journal Title: Journal of Horticulture Science - Year 2024, Vol 38, Issue 1
Abstract
IntroductionPomegranate is a native fruit tree to Iran and has the best growth and performance in subtropical climate conditions. In recent years, due to environmental stresses conditions such as high temperature, high light intensity and low irrigation water a large number of orchards have faced to physiological problems such as fruit cracking, sunburn and a decrease in fruit quality. The high temperature along with high evaporation and transpiration can be considered as the main cause of these abnormalities, which causes disturbances in the process of plant metabolism and finally causes physiological disorders. Sunburn of the fruit is caused by high temperature and high sunlight intensity and has a negative effect on all the quality characteristics of the pomegranate fruit. Using net shade is one of the recommended ways to reduce the impact of climate change. Application of net shading in areas with high radiation levels has led to a decrease in the intensity of light radiation received by the canopy of the trees, which causes a decrease in the temperature of the leaf surface, and decrease the level of evaporation and transpiration in the trees. Materials and MethodsThis research was conducted during 2019-2020 for 2 years in a private orchard in the Kohmar area of Kazeron city of Iran. ÌRababÌ pomegranate trees that were planted at a distance of 5 x 5 m and 15 years old were used. In this research, the effect of different types of net shading was investigated. The experiment was conducted as a randomized complete block design with 9 treatments and three replications in two years. The experimental treatments included the use of net shading in white and green colors with two different shading (30% and 50%) and two implementation methods (on the base and on the canopy of the tree) which were compared with control trees (without cover). During the growing season, measurements were made in relation to leaf temperature, sunlight intensity, soil moisture, relative water content of leaves, fresh and dry matter of leaves, and prolin content, and at the time of harvest, the percentage of sunburn, cracking and aril paleness of the fruit, thickness of fruit peel and anthocyanin content of fruit juice in all treatments were measured. Results and DiscusionsThe use of net shading increased the quantitative and qualitative characteristics of pomegranate fruits. The results of this research showed that the use of white and green nets 50% and green net 30% on the base had the best results. By using the appropriate type of net shading, the temperature of the pomegranate tree was reduced by about 6 degrees Celsius. Net shading also reduced the light intensity by at least 50%; the reduction of light intensity in green nets was more than in white nets.The highest relative water content was 85% in the green net shade (50% with base) treatment. Net shading significantly increased the water content of the leaves compared to the control.The use of net shading significantly reduced the percentage of sunburn on fruits compared to the control. Sunburn was about 14% in the control treatment and less than 5% in the net shading treatments. Net shading reduced the percentage of fruit cracking from 15 percent in the control treatment to about 7 percent in all shading treatments. ConclusionThe use of net shading as a cover for pomegranate trees reduces the temperature of the canopy of the plant by reducing the radiation of the sun, and by better maintaining the moisture of the soil of the pomegranate tree. It reduces the heat and drought stress condition and has a positive effect on the quantity and quality of the fruit produced. Among the treatments used, the use 3 types of net including 50% white nets on the base, and 30% and 50% green nets on the base had the best results. These treatments better than others in terms of shading percentage, temperature reduction, and improving the quantity and quality of pomegranate fruits . Net shading should be installed when the fruits are about 5 to 7 cm in diameter and will remain on the tree until mid-September. This type of tree shading did not leave any side effects on the quantity and quality of the fruits.
Authors and Affiliations
Alireza Bonyanpour,
Keywords
Related Articles
- EP ID EP754305
- DOI https://doi.org/10.22067/jhs.2023.83640.1278
- Views 20
- Downloads 0
Determination of the Most Suitable Time for Harvesting Olive (Olea europea L.) Fruits 'Yellow' and 'Arbequina' Cultivars Based on Physiologic Characteristics
IntroductionOlive (Olea europea L.) fruit ripening is a slow and long process and has a great impact on fruit quality, including the amount of oil. Also, interrupting the harvest and extraction of olive oil causes unfavo...
The Effect of Amino Acid L-Phenylalanine, Selenium and Nitroxin Biological Fertilizer on the Physicochemical Properties of Goji Berries (Lycium barbarum cv. GB1)
Introduction The Lycium genus of the Solanaceae family has excellent nutritional and medicinal value. Two species of Lycium barbarum L. and Lycium chinense Mill. It is often called wolfberry or goji berry. The use of a...
The Effect of Different Levels of Phosphorus and Zinc Spraying on Growth Properties, Oil Content and Biochemical Characteristics of Securigera securidaca
IntroductionOptimum nutrition of plants and reducing the effect of lack of important nutrients is one of the most effective factors on the production of all plants; so, it is one of the main pillars in improving the quan...
Effect of Different Concentrations of Salicylic Acid in Increasing Resistance to Heat Stress in Cucumber (Cucumis sativa var. Rashid)
IntroductionGrasses are narrow-leaved plants that are used as cover plants in landscape. These plants are one of the basic and necessary components of the green cover of most gardens, parks and as the background color of...
Investigating the Effect of Different Concentrations of Salicylic Acid and Citric Acid on some Quality Characteristics and Microbial Load of Fresh Cut Watermelon (Citrullus lanatus)
Introduction Watermelon (Citrullus lanatus) (Thunb) is known as a rich source of various vitamins (such as vitamin A) and phytochemical compounds that have high antioxidant activity. Studies show that characteristics s...