Sobhy Khalefa - Academia.edu (original) (raw)
Papers by Sobhy Khalefa
Journal of Agriculture and Food Research, Feb 29, 2024
Annals of Agricultural Science, Moshtohor, 2018
This study was carried out during the two successive seasons of 2016 and 2017 in order to study t... more This study was carried out during the two successive seasons of 2016 and 2017 in order to study the effect of some pre-harvest treatments. i.e. ascorbic acid (AsA), citric acid (CiA), salicylic acid (SA) each at (400 and 600 ppm), gibberellic acid (GA3) at (50 and 100 ppm), and calcium chloride (CaCl2) at (1 and 2%(w/v)) on the yield and fruit quality of nine years old Swelling peach trees (Prunuspersica L.) growing in sandy soil,under drip irrigation system. Results showed that GA3 at 100 ppm and CaCl2 at 2 % gave the highest values of total yield,also GA3 at 100 ppm significantly increased fruit weight, size and fruit firmness as compared with other treatments in both seasons. Both AsA and CiA at 600 ppm caused the highest increase in TSS % ,total sugars andanthocyanin contents, while both AsA at 400 and 600 ppm and CiA at 600 ppm were caused increasing in fruit TSS/ acid ratio in both seasons. Meanwhile, GA3 at 100 ppmsignificantly increased fruit acidity, chlorophyll a and b contents as compared with the other treatments. Generally, it could be concluded that, gibberellic, salicylic acids and calcium chloride markedly increased yield, fruit firmness and fruit chlorophyll a and b content as compared with all other treatments.
Gels
Nowadays, the production of new mango cultivars is increased in many countries worldwide. The soi... more Nowadays, the production of new mango cultivars is increased in many countries worldwide. The soil application of hydrogel represents a novel approach in the fruit trees industry. This investigation aims to study the effect of adding hydrogel (as soil conditioner) on the growth and yield of Shelly cv. mango trees. The experimental groups were assigned to a control group and three other treated groups, including 250, 500, or 750 g hydrogel∙tree−1. The results demonstrated that all applications of hydrogel composite had higher vegetative growth parameters, yield, and fruit quality characteristics of Shelly cv. mango trees compared to the control. The treatment of 750 g hydrogel∙tree−1 had higher values of vegetative growth parameters such as the leaf area, shoot length and tree canopy volume, compared to the control group and the other treatments. Similarly, higher values for yield and fruit quality were observed in the treatment of 750 g hydrogel∙tree−1. In conclusion, different amou...
Plants
Chinese mandarin fruits are an inexpensive and rich source of vitamin C. They have potential bene... more Chinese mandarin fruits are an inexpensive and rich source of vitamin C. They have potential benefits in treating acute respiratory infections and mitigating inflammation in critical patients with COVID-19. In Egypt, citrus is the most important fruit tree but is sensitive to salinity stress, resulting in poor vegetative tree growth and reductions in productivity and fruit quality. Magnetic iron has emerged as a promising approach in the citrus tree industry, since it improves vegetative growth, yield, and fruit quality and alleviates salinity stress in Chinese mandarin trees grown in soils suffering from high salt stress. This research is aimed at studying the influence of adding magnetic iron (as soil treatment) on tree canopy growth, yield, and fruit quality of ‘Chinese’ mandarin trees. Therefore, the treatments were as follows: 0, 250, 500, and or 750 g of magnetic iron.tree−1. Our results indicated that all applications of magnetic iron significantly improved tree canopy volume...
Frontiers in Plant Science
Because of their unique features, nanomaterials have been proposed and have gained acceptance in ... more Because of their unique features, nanomaterials have been proposed and have gained acceptance in postharvest applications in fruit. Increasing the storage life and improving the quality of Valencia oranges was investigated using nano-chitosan. A chitosan nanoparticle was prepared by using high-energy ball milling. Chitosan nanoparticles were characterized by Dynamic light scattering, FTIR spectroscopy and Surface morphology by transmission electron microscopy. Fully mature Valencia oranges were harvested and then coated with one of these concentrations (0.2, 0.4, and 0.8% nano-chitosan) and control. The fruits were stored under room storage conditions for 75 days. The quality parameters (fruit weight losses, fruit decay percentage, fruit firmness, total acidity, total soluble solids percentage and T.S.S./acid ratio, ascorbic acid content) were taken in biweekly intervals after 0, 15, 30, 45, 60, and 75 days. Beside the in vitro testing of antifungal activity of chitosan nanoparticle...
IgMin Research, Nov 15, 2023
In addressing Article Processing Charges (APCs), IgMin Research: STEM recognizes their signi ican... more In addressing Article Processing Charges (APCs), IgMin Research: STEM recognizes their signi icance in facilitating open access and global collaboration. The APC structure is designed for affordability and transparency, re lecting the commitment to breaking inancial barriers and making scienti ic research accessible to all. IgMin Research-STEM | A Multidisciplinary Open Access Journal fosters cross-disciplinary communication and collaboration, aiming to address global challenges. Authors gain increased exposure and readership, connecting with researchers from various disciplines. The commitment to open access ensures global availability of published research. Join IgMin Research-STEM at the forefront of scienti ic progress. https://www.igminresearch.com/pages/publish-now/apc WHY WITH US IgMin Research | STEM employs a rigorous peer-review process, ensuring the publication of high-quality research spanning STEM disciplines. The journal offers a global platform for researchers to share groundbreaking indings, promoting scienti ic advancement.
Pruning is an important part in controlling the branching, good fruit size, and prodctivity of fr... more Pruning is an important part in controlling the branching, good fruit size, and prodctivity of fruit trees. and consequently, ‘Valencia’ orange trees were grown many years ago, the trees were suffering from a decline in productivity in the newly reclaimed lands after certain years of plantation. This study elucidated the effect of pruning severity on growth, yield and fruit quality of ‘Valencia’ orange trees. Four levels of pruning were applied on 35 years old ‘Valencia’ orange trees as follows: T1: Control (un-pruned), T2: Light pruning ( 25% of main branches were removed); T3: Moderate pruning (50% of main branches were removed) and T4: Heavy pruning: 75% of main branches were removed. The treatments were done in February 15th (for each season). The results indicated that pruning severity increased vegetative growth paraments such as shoot length and leaf area and decreased canopy volume of Valencia orange trees in comparison to control. Maximum yield was gained from 75% followed ...
Annals of Agricultural Science, Moshtohor, 2015
The present study was carried out during the two successive seasons 2013 and 2014 on 5 years old ... more The present study was carried out during the two successive seasons 2013 and 2014 on 5 years old two mandarin varieties namely Balady and Fremont (Citrus reticulate Blanco) to elucidate the effect of magnetic water treatments on yield and fruit quality. The results indicated that irrigating the trees of the two mandarin varieties with magnetic water had significantly increased yield (kg/tree) in comparison to that of control. Maximum yield (Kg/trees) was obtained from mandarin varieties were irrigated all over the growth seasons with magnetic water. In this regard Balady mandarin variety which was superior to those of Fremont one compared with control. The physical and chemical fruit characteristics of the two tested mandarin varieties were significantly improved in response to irrigation with saline water treated with magnetic in comparison to control that was irrigated with saline water too. More studies are needed to declare the influence of magnetic water on the growth, yield and fruit quality of different citrus varieties.
Al-Azhar Journal of Agricultural Research, 2020
Murcott' mandarin fruits are suffering from sunburn injury in arid and semi-arid lands. In this r... more Murcott' mandarin fruits are suffering from sunburn injury in arid and semi-arid lands. In this regard, hydrogel represents a promising approach in the citrus industry, since it improves growth, yield, and fruit quality under abiotic stress. This investigation aims to study the effect of adding of hydrogel (as soil conditioner) with or without water regime on growth and yield of 'Murcott' mandarin trees budded on Volkamer lemon rootstock grown in sandy soil. The experimental farm location belongs to arid and semi-arid lands. The treatments were as follows 1: control (100 %) of crop evapotranspiration (Etc), 2: 75% of Etc, 3: 75% of Etc+250 g of hydrogel / tree, 4: 75% of Etc+500 g of hydrogel/tree and 5:75% of Etc+750 g of hydrogel/tree. The results indicated that all applications of hydrogel composite significantly improved vegetative growth, yield, and fruit quality characteristics of 'Murcott' mandarin trees compared to the control. Regarding the vegetative growth, hydrogel at 750 g/tree under 75% of Etc had the optimal values of vegetative growth parameters such as leaf area, shoot length, and tree canopy volume compared to all the other treatments. A similar trend was noticed regarding yield and fruit quality, as the best values were obtained when the hydrogel was used at 750 g /tree under 75% of Etc. In conclusion, the application of hydrogel agent can improve the production and fruit quality of 'Murcott' mandarin trees in arid and semi-arid lands.
Annals of Agric. Sci., Moshtohor, 2015
The present study was carried out during the two successive seasons 2013 and 2014 on 5 years old ... more The present study was carried out during the two successive seasons 2013 and 2014 on 5 years old two mandarin varieties namely Balady and Fremont (Citrus reticulate Blanco) to elucidate the effect of magnetic water treatments on yield and fruit quality. The results indicated that irrigating the trees of the two mandarin varieties with magnetic water had significantly increased yield (kg/tree) in comparison to that of control. Maximum yield (Kg/trees) was obtained from mandarin varieties were irrigated all over the growth seasons with magnetic water. In this regard Balady mandarin variety which was superior to those of Fremont one compared with control. The physical and chemical fruit characteristics of the two tested mandarin varieties were significantly improved in response to irrigation with saline water treated with magnetic in comparison to control that was irrigated with saline water too. More studies are needed to declare the influence of magnetic water on the growth, yield and fruit quality of different citrus varieties.
The current study was carried out during the two successive seasons of 2014/2015 and 2015/2016 to... more The current study was carried out during the two successive seasons of 2014/2015 and 2015/2016 to investigate the effect of different water regimes (100%, 80% and 60%) of crop evapotranspiration (Etc) on fruit quality and storability of Valencia orange fruits under cold storage conditions. Fruit samples were collected at maturity stage and stored at 5 °C and RH at 85% ± 2 for 105 days. Valencia orange is the most export cultivar among other citrus species in Egypt which mainly cultivated in newly reclaimed soils. As a matter of fact, water is becoming a scarce commodity and the available water resources are becoming more and more costly to mobilize. On the other hand, Water deficit irrigation has been used to increase grower financial revenue by increasing fruit grade and value through a reduction in rind creasing in some orange cultivars. Results indicated that fruit weight loss (%), decay (%), juice content (cm 3), TSS % and TSS/Acid ratio as well as vitamin C of fruits were increased with extending the period of cold storage. Whereas, firmness of fruit peel and pulp, total acidity (%) decreased by increasing the period of cold storage. Irrigation tree with 80% of (Etc) was the best treatment for improving fruit quality under cold storage conditions in comparison to other treatments. The 80% irrigation treatment proportionate a water saving of 20%, which consists in lower irrigation costs that might compensate the slightly yield losses in fruit production.
Journal of Agriculture and Food Research, Feb 29, 2024
Annals of Agricultural Science, Moshtohor, 2018
This study was carried out during the two successive seasons of 2016 and 2017 in order to study t... more This study was carried out during the two successive seasons of 2016 and 2017 in order to study the effect of some pre-harvest treatments. i.e. ascorbic acid (AsA), citric acid (CiA), salicylic acid (SA) each at (400 and 600 ppm), gibberellic acid (GA3) at (50 and 100 ppm), and calcium chloride (CaCl2) at (1 and 2%(w/v)) on the yield and fruit quality of nine years old Swelling peach trees (Prunuspersica L.) growing in sandy soil,under drip irrigation system. Results showed that GA3 at 100 ppm and CaCl2 at 2 % gave the highest values of total yield,also GA3 at 100 ppm significantly increased fruit weight, size and fruit firmness as compared with other treatments in both seasons. Both AsA and CiA at 600 ppm caused the highest increase in TSS % ,total sugars andanthocyanin contents, while both AsA at 400 and 600 ppm and CiA at 600 ppm were caused increasing in fruit TSS/ acid ratio in both seasons. Meanwhile, GA3 at 100 ppmsignificantly increased fruit acidity, chlorophyll a and b contents as compared with the other treatments. Generally, it could be concluded that, gibberellic, salicylic acids and calcium chloride markedly increased yield, fruit firmness and fruit chlorophyll a and b content as compared with all other treatments.
Gels
Nowadays, the production of new mango cultivars is increased in many countries worldwide. The soi... more Nowadays, the production of new mango cultivars is increased in many countries worldwide. The soil application of hydrogel represents a novel approach in the fruit trees industry. This investigation aims to study the effect of adding hydrogel (as soil conditioner) on the growth and yield of Shelly cv. mango trees. The experimental groups were assigned to a control group and three other treated groups, including 250, 500, or 750 g hydrogel∙tree−1. The results demonstrated that all applications of hydrogel composite had higher vegetative growth parameters, yield, and fruit quality characteristics of Shelly cv. mango trees compared to the control. The treatment of 750 g hydrogel∙tree−1 had higher values of vegetative growth parameters such as the leaf area, shoot length and tree canopy volume, compared to the control group and the other treatments. Similarly, higher values for yield and fruit quality were observed in the treatment of 750 g hydrogel∙tree−1. In conclusion, different amou...
Plants
Chinese mandarin fruits are an inexpensive and rich source of vitamin C. They have potential bene... more Chinese mandarin fruits are an inexpensive and rich source of vitamin C. They have potential benefits in treating acute respiratory infections and mitigating inflammation in critical patients with COVID-19. In Egypt, citrus is the most important fruit tree but is sensitive to salinity stress, resulting in poor vegetative tree growth and reductions in productivity and fruit quality. Magnetic iron has emerged as a promising approach in the citrus tree industry, since it improves vegetative growth, yield, and fruit quality and alleviates salinity stress in Chinese mandarin trees grown in soils suffering from high salt stress. This research is aimed at studying the influence of adding magnetic iron (as soil treatment) on tree canopy growth, yield, and fruit quality of ‘Chinese’ mandarin trees. Therefore, the treatments were as follows: 0, 250, 500, and or 750 g of magnetic iron.tree−1. Our results indicated that all applications of magnetic iron significantly improved tree canopy volume...
Frontiers in Plant Science
Because of their unique features, nanomaterials have been proposed and have gained acceptance in ... more Because of their unique features, nanomaterials have been proposed and have gained acceptance in postharvest applications in fruit. Increasing the storage life and improving the quality of Valencia oranges was investigated using nano-chitosan. A chitosan nanoparticle was prepared by using high-energy ball milling. Chitosan nanoparticles were characterized by Dynamic light scattering, FTIR spectroscopy and Surface morphology by transmission electron microscopy. Fully mature Valencia oranges were harvested and then coated with one of these concentrations (0.2, 0.4, and 0.8% nano-chitosan) and control. The fruits were stored under room storage conditions for 75 days. The quality parameters (fruit weight losses, fruit decay percentage, fruit firmness, total acidity, total soluble solids percentage and T.S.S./acid ratio, ascorbic acid content) were taken in biweekly intervals after 0, 15, 30, 45, 60, and 75 days. Beside the in vitro testing of antifungal activity of chitosan nanoparticle...
IgMin Research, Nov 15, 2023
In addressing Article Processing Charges (APCs), IgMin Research: STEM recognizes their signi ican... more In addressing Article Processing Charges (APCs), IgMin Research: STEM recognizes their signi icance in facilitating open access and global collaboration. The APC structure is designed for affordability and transparency, re lecting the commitment to breaking inancial barriers and making scienti ic research accessible to all. IgMin Research-STEM | A Multidisciplinary Open Access Journal fosters cross-disciplinary communication and collaboration, aiming to address global challenges. Authors gain increased exposure and readership, connecting with researchers from various disciplines. The commitment to open access ensures global availability of published research. Join IgMin Research-STEM at the forefront of scienti ic progress. https://www.igminresearch.com/pages/publish-now/apc WHY WITH US IgMin Research | STEM employs a rigorous peer-review process, ensuring the publication of high-quality research spanning STEM disciplines. The journal offers a global platform for researchers to share groundbreaking indings, promoting scienti ic advancement.
Pruning is an important part in controlling the branching, good fruit size, and prodctivity of fr... more Pruning is an important part in controlling the branching, good fruit size, and prodctivity of fruit trees. and consequently, ‘Valencia’ orange trees were grown many years ago, the trees were suffering from a decline in productivity in the newly reclaimed lands after certain years of plantation. This study elucidated the effect of pruning severity on growth, yield and fruit quality of ‘Valencia’ orange trees. Four levels of pruning were applied on 35 years old ‘Valencia’ orange trees as follows: T1: Control (un-pruned), T2: Light pruning ( 25% of main branches were removed); T3: Moderate pruning (50% of main branches were removed) and T4: Heavy pruning: 75% of main branches were removed. The treatments were done in February 15th (for each season). The results indicated that pruning severity increased vegetative growth paraments such as shoot length and leaf area and decreased canopy volume of Valencia orange trees in comparison to control. Maximum yield was gained from 75% followed ...
Annals of Agricultural Science, Moshtohor, 2015
The present study was carried out during the two successive seasons 2013 and 2014 on 5 years old ... more The present study was carried out during the two successive seasons 2013 and 2014 on 5 years old two mandarin varieties namely Balady and Fremont (Citrus reticulate Blanco) to elucidate the effect of magnetic water treatments on yield and fruit quality. The results indicated that irrigating the trees of the two mandarin varieties with magnetic water had significantly increased yield (kg/tree) in comparison to that of control. Maximum yield (Kg/trees) was obtained from mandarin varieties were irrigated all over the growth seasons with magnetic water. In this regard Balady mandarin variety which was superior to those of Fremont one compared with control. The physical and chemical fruit characteristics of the two tested mandarin varieties were significantly improved in response to irrigation with saline water treated with magnetic in comparison to control that was irrigated with saline water too. More studies are needed to declare the influence of magnetic water on the growth, yield and fruit quality of different citrus varieties.
Al-Azhar Journal of Agricultural Research, 2020
Murcott' mandarin fruits are suffering from sunburn injury in arid and semi-arid lands. In this r... more Murcott' mandarin fruits are suffering from sunburn injury in arid and semi-arid lands. In this regard, hydrogel represents a promising approach in the citrus industry, since it improves growth, yield, and fruit quality under abiotic stress. This investigation aims to study the effect of adding of hydrogel (as soil conditioner) with or without water regime on growth and yield of 'Murcott' mandarin trees budded on Volkamer lemon rootstock grown in sandy soil. The experimental farm location belongs to arid and semi-arid lands. The treatments were as follows 1: control (100 %) of crop evapotranspiration (Etc), 2: 75% of Etc, 3: 75% of Etc+250 g of hydrogel / tree, 4: 75% of Etc+500 g of hydrogel/tree and 5:75% of Etc+750 g of hydrogel/tree. The results indicated that all applications of hydrogel composite significantly improved vegetative growth, yield, and fruit quality characteristics of 'Murcott' mandarin trees compared to the control. Regarding the vegetative growth, hydrogel at 750 g/tree under 75% of Etc had the optimal values of vegetative growth parameters such as leaf area, shoot length, and tree canopy volume compared to all the other treatments. A similar trend was noticed regarding yield and fruit quality, as the best values were obtained when the hydrogel was used at 750 g /tree under 75% of Etc. In conclusion, the application of hydrogel agent can improve the production and fruit quality of 'Murcott' mandarin trees in arid and semi-arid lands.
Annals of Agric. Sci., Moshtohor, 2015
The present study was carried out during the two successive seasons 2013 and 2014 on 5 years old ... more The present study was carried out during the two successive seasons 2013 and 2014 on 5 years old two mandarin varieties namely Balady and Fremont (Citrus reticulate Blanco) to elucidate the effect of magnetic water treatments on yield and fruit quality. The results indicated that irrigating the trees of the two mandarin varieties with magnetic water had significantly increased yield (kg/tree) in comparison to that of control. Maximum yield (Kg/trees) was obtained from mandarin varieties were irrigated all over the growth seasons with magnetic water. In this regard Balady mandarin variety which was superior to those of Fremont one compared with control. The physical and chemical fruit characteristics of the two tested mandarin varieties were significantly improved in response to irrigation with saline water treated with magnetic in comparison to control that was irrigated with saline water too. More studies are needed to declare the influence of magnetic water on the growth, yield and fruit quality of different citrus varieties.
The current study was carried out during the two successive seasons of 2014/2015 and 2015/2016 to... more The current study was carried out during the two successive seasons of 2014/2015 and 2015/2016 to investigate the effect of different water regimes (100%, 80% and 60%) of crop evapotranspiration (Etc) on fruit quality and storability of Valencia orange fruits under cold storage conditions. Fruit samples were collected at maturity stage and stored at 5 °C and RH at 85% ± 2 for 105 days. Valencia orange is the most export cultivar among other citrus species in Egypt which mainly cultivated in newly reclaimed soils. As a matter of fact, water is becoming a scarce commodity and the available water resources are becoming more and more costly to mobilize. On the other hand, Water deficit irrigation has been used to increase grower financial revenue by increasing fruit grade and value through a reduction in rind creasing in some orange cultivars. Results indicated that fruit weight loss (%), decay (%), juice content (cm 3), TSS % and TSS/Acid ratio as well as vitamin C of fruits were increased with extending the period of cold storage. Whereas, firmness of fruit peel and pulp, total acidity (%) decreased by increasing the period of cold storage. Irrigation tree with 80% of (Etc) was the best treatment for improving fruit quality under cold storage conditions in comparison to other treatments. The 80% irrigation treatment proportionate a water saving of 20%, which consists in lower irrigation costs that might compensate the slightly yield losses in fruit production.