SVU-International Journal of Agricultural Sciences
EISSN : 2636-381X
Published by: Egypts Presidential Specialized Council for Education and Scientific Research (10.21608)
Total articles ≅ 85
Latest articles in this journal
Published: 1 July 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 96-107; doi:10.21608/svuijas.2021.74407.1107
A field experiment was performed at the Arb El-Awamer Research Station, Assuit Governorate, Agricultural Research Center, Egypt during the two consecutive summer seasons of 2017 and 2018 to achieve the highest yield and good oil quality of nine tested sunflower genotypes. In both seasons, the experiment was conducted using the split plot design in randomized complete block design with three replicates arrangement keeping irrigation system (sprinkler and drip) in the main plots, and sunflower genotypes (L990, L770, L465, L125, L460, L880, L120, Giza 102 and Sakha 53) in the sub plots. Yield and quality traits were significantly influenced by irrigation system and genotypes as well as their interactions in both seasons and their combined analysis. The drip irrigation system seems to be a good compromise between the highest seed yield /fedden and good fatty acid composition of oil. Line 120 was ranked in the first order in head diameter, 100-seed weight, seed weight /plant, flowered late and hence seed yield /fedden, as well as seed oil content, whereas, Sakha 53 characterized with it contained the highest proportion of unsaturated fatty acids. The highest values of head diameter, 100-seed weight, seed weight /plant and hence seed yield /fedden as well as the highest proportion of unsaturated fatty acids composition were obtained by grown sunflower L120 at drip irrigation system.
Published: 1 July 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 71-84; doi:10.21608/svuijas.2021.66837.1089
This study aims to study the effect of adding rock phosphate and plant growth-promoting rhizobacteria (PGPR), in the physical and chemical properties of the corn residues compost during aerobic decomposition. Four composting heaps were included in this study as it follows, 1) traditional method composting heap (T1), 2) heap was supplied with rock phosphate (T2), 3) heap was supplied with rock phosphate + Bacillus megatherum culture (T3), and 4) heap was supplied with rock phosphate+(Bacillus.megatherum, Azospirillum lipoferum, Azotobacter chroococcum) mixed cultures (T4). All compost treatments showed an increase in temperature right after composting started. The heap treated with three bacterial inoculums (T4) reached the highest peak values of 62.2°C on day 12 compared to other treatments. At the end of the composting period T1 recorded the lowest value of bulk density (533 kg/m3) compared to other treatments. The pH value declined to stabilize with the end result at 100 days being 6.9, 7.4, 7.1 and 7.0 for composting treatment T1, T2, T3 and T4, respectively. The initial C/N ratio was 61:1 for all composting treatments, and the final values of total C/N ratio after the 100 days were 15:1, 14:1, 12:1 and 10:1 for composting treatments T1, T2, T3 and T4 respectively. Compost supplied with rock phosphate and three bacterial inoculums (T4) reached has more N, P and K content compared to other composting treatments T1, T2, T3. These results indicated that adding rock phosphate and (PGPR) to corn residues during composting improve nutritional value of the resulting compost.
Published: 1 July 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 85-95; doi:10.21608/svuijas.2021.69717.1096
Grape mealybug consider the most universally important vineyard insect pest. Insecticides are the main strategy to grapevine insect control. The result showed that the recommended rate of Imidacloprid is succeeded in controlling of mealybug since its initial reduced of the infestation were 89.26, 84.21and 85.71 % for first season and 82.71, 82.94 and 83.56 % for second season for Flame seedless, Early sweet seedless and Sugraone seedless, respectively. Meanwhile, the total mean of reduction after 3,7, 14 and 30 days were 95.79, 64.83 and 72.82 % for first season and 85.20, 66.33 and 69.84 % for second season on Flame seedless, Early sweet seedless and Sugraone seedless, respectively. On the other hand, the total mean of reduction after 3,7, 14 and 30 days were 72.56, 80.40 and 82.50% for first season and 68.88, 76.13 and 75.56% for second season on Flame seedless, Early sweet seedless and Sugraone seedless, respectively. In addition, all of them are above 70% reduction. From these results, it should be suggested using some effective alternatives such as Palmito compound in controlling mealy bug incompatible program with chemical insecticides instead of conventional individuals' insecticides. The grapevine variety, Early sweet seedless showed the significant superiority in the quality traits. Under conditions of this investigation, the grapevine variety, Early sweet seedless was recorder the highest values for yield per vine, TSS and total sugar% in both seasons.
Published: 13 May 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 60-70; doi:10.21608/svuijas.2021.70197.1099
This study was conducted during 2018, 2019 and 2020 seasons, on 10 years old Flame Seedless grapevines, grown on the experimental vineyard of Research Station Agriculture, EL-Matana, Esna, Luxor, Egypt to study the effect of organic and bio-fertilization on vegetative growth, nutrient status, and fruiting of Flame Seedless grapevines. The experiment was arranged in a complete randomized block design with seven treatments and three replications two vine per each. The obtained results could be summarized as follow: Using the recommended dose of nitrogen (RDN) via 50 or 25% mineral plus 50 or 75% or 50% organic and bio-form significantly increased, pruning wood weight, number of leaves/shoot and leaf area as well as leaf total chlorophyll and leaf nutrient composition compared to use RDN via mineral N fertilizer alone. No significant differences on these traits due to use RDN via 50% mineral plus 50 organic or bio, double form or 25% N plus 75 bio-form and triple born. All combined fertilization treatments significantly increased the yield and improved the cluster and berry traits compared to use RDN via mineral source only. It is evident from the foregoing results that double form 50% mineral plus 50% either organic or bio or triple form (25% N plus, 75 organic and bio.) improved the vegetative growth, yield and berry quality. In addition, it minimized the production costs and reduced environmental pollution.
Published: 10 May 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 40-59; doi:10.21608/svuijas.2021.69758.1097
This study was conducted at El-Mattana Agricultural Research Station, Luxor Governorate, Egypt (latitude of 25.17° N and longitude of 32. 33°E) on three sugar crop cycles 2017/18 (plant cane crop), 2018/19 (the first ratoon) and 2019/20 (the second ratoon) to screen sugarcane genotypes for yield, quality and borer resistance, also estimates the relationship among agronomical and pathological traits based on principal components biplot analysis. Results revealed that significant differences among sugarcane genotypes in susceptibility to the lesser sugarcane borer, Chilo agamemnon infestation measured as bored stalk%, bored joints %, girdled stalks%, mean no. holes/joint, mean no. holes/bored joint and mean no. holes/stalk in the three studied seasons. In plant cane and first ratoon seasons the genotype L 62-96 exhibited the highest bored stalk %. While, in the second ratoon, the genotype G.T.54-9 was recorded the highest bored stalk %. Three genotypes (F. 150, M 57-35 and G. 2008-20) were the most tolerant in plant cane season recording the lowest bored stalk%. While, in the 1st ratoon season, EH88/5-27 and SP72-5181 genotypes were recording lowest bored stalk%. Meanwhile, in the 2nd ratoon season, SP 81-3250, F. 150, F 161 and G. 2007-61 genotypes were recording lowest bored stalk% respectively.
Published: 3 May 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 30-39; doi:10.21608/svuijas.2021.71236.1102
Using morphological and molecular methods, this research sought to distinguish, classify, and characterize the pathogen associated with pokkah boeng disease (knife-cut symptoms). During the 2021 growing season, the sugarcane breeding program at El-Mattana Agricultural Research Station, Luxor Governorate, Egypt, the knife-cut symptom was observed on stalks of sugarcane (variety G.2009-99). The causal pathogen was isolated from samples taken from infected stalks with knife-cut lesions. Pathogenicity studies affirmed that the pathogen isolate was pathogenic on cuttings of the commercial sugarcane variety G. T. 54-9. After 7 days from inoculation, disease signs were detected in cane stalks when opened longitudinally. Stalks of sugarcane in control treatments showed no signs of disease. The pathogen was re-isolated and determined to be similar to the causal fungus that triggered knife-cut symptoms in a normal infection in the field. Morphological characteristics of growth rates, colony features, and shapes of macroconidia, microconidia, conidiogenous cells, and chlamydospores were used to identify the isolate. The pathogen internal transcribed spacer (ITS) was sequenced using ITS1 and ITS4 primers to classify and differentiate it. After microscopic morphology and gene sequencing, the fungus isolate was identified as Fusarium verticillioides. The pathogen pure culture was preserved in the Assiut University Mycological Centre as AUMC 14795, and the ITS sequence was uploaded to GenBank as MW692089. More research is required to assess the prevalence of the pathogen, the resistance of various sugarcane varieties, and an effective method for managing the pathogen.
Published: 9 April 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 58-71; doi:10.21608/svuijas.2021.68447.1092
This study was established during two consecutive seasons of 2019 and 2020 in a private mango orchard situated at KomOmbo, Aswan Governorate (24° 28' 45.1596" and 32° 56' 28.626") where the texture of soil is clay and water table depth not less than two meters. Fifteen mango seedling strains age of trees ranging from 25 to 30- years old. They were planted at 6x6 meters; regular horticultural practices were carried out as usual. The growth, nutritional status, yield and quality of fruits of fifteen mango seedling strains were evaluated under conditions of Aswan region based on relatively better yield and fruit quality. The following strains of mango seedlings have been cultivated successfully, thirteenth, twelfth, eleventh and tenth strain in descending order under Aswan conditions. Also, through the numerical evaluation of the productivity characteristics and the fruit quality of the strains under study, it became clear that the tenth, eleventh, twelfth and thirteenth strains showed superiority, so they must be cultivated and spread them through vegetative propagation and expand their cultivation.
Published: 8 April 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 52-57; doi:10.21608/svuijas.2021.65535.1086
The fall armyworm, Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae), is a harmful pest of many plants. In Egypt, the presence of S. frugiperda in maize fields was reported in 2019. The aim of this study was to record the parasitoids of S. frugiperda in Egypt. The survey was conducted at Sohag and Qena governorates. Survey studies showed five parasitoids were recorded. In Sohag governorate, from the total samples of fall armyworm collected, four species of parasitoids emerged, three of them belonged to order hymenoptera and one belonged to diptera. Two of the hymenopteran parasitoids were found in samples collected from Shandaweel district, Dinarmus basalis (Rondani, 1877) family Pteromalidae and Cotesia ruficrus (Haliday) family Braconidae. While the third is Microplitis rufiventris (Kokujev) family Braconidae was emerged from samples collected fromEl-Osyrat district. However, the dipteranparasitoidis Exorista (Tachina) larvarum (Linnaeus), which emerged from samples collected from Shandaweel district. In Qena governorate, one parasitoid species emerged Chelonus intermedius (Thomson) which was found inAbu Tesht district. Up to my knowledge this is the first record of the mentioned parasitoids on S. frugiperda in Egypt.
Published: 1 April 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 22-36; doi:10.21608/svuijas.2021.62483.1081
Recycling of ligno-cellulosic residues and economically viable crops production with improved water use efficiency is imperative to secure high-quality sustainable food production and implement the environmental sustainability. Therefore, the objective of this work was to evaluate superabsorbent sugarcane bagasse polymer composite (SBP) on Stevia rebaudiana quality and production under deficit irrigation. The experiment was conducted at Sabahia Agricultural Research Station, Alexandria, Egypt during two seasons 2017/2018 and 2018/2019 under the greenhouse conditions. Three SBP treatments (0.0, 2.0 and 4.0 g/5 kg of soils) using three irrigation levels (100%, 70% and 50% of field capacity) were applied. Data revealed that the soil amendment with SBP enhanced and gave the highest values of stevia growth parameters, chlorophyll, total soluble carbohydrate and steviol glycoside (SVglys) under both irrigation systems in both seasons. The SBP at dosage 2 and 4% levels into the soil led to an increase of dry leaves yield by 1.5 and 1.32 fold, respectively compared to yield in untreated soil under 70% field capacity. Calculated SVglys and determined by IR was high in soil amendment with 2.0% SBP (15.60%) under 100% irrigation levels and nearly closed in 70% irrigation level (15.02%). SBP application under deficit irrigation conditions increased of amount WUE and showed improvement in peroxidase isozyme system that can be used as a biomarker for characterizing drought stress tolerance. Hence, it could be recommended that SBP can be used to enhance the stevia productivity and enabled the survival of stevia plant under deficit irrigation conditions.
Published: 1 April 2021
SVU-International Journal of Agricultural Sciences, Volume 3, pp 16-29; doi:10.21608/svuijas.2021.68858.1094
This study was carried out during the 2019 and 2020 seasons at the Agricultural Research Station of Al- Marashda to study the effect of three types of growing media and four levels of NPK fertilization on the growth characteristics and chemical composition of the seedlings of Inga edulis trees. The experiment comprised four NPK treatments; 0 (control), 1.5, 3, and 4.5g NPK/ pot. The applied growing media; sand, clay, and sand: clay (1:1 v/v). It was set in a split-plot design with four replicates; each contained four plastic pots. The main plot included the three growing media, the sub-plot included the four mineral fertilization treatments; to give 12 treatments. It’s obvious that planting of I. edulis seedlings in the sand: clay growing medium resulted in the highest values of growth parameters. Regarding the effects of the used treatments on the leaf content of nitrogen, phosphorous, potassium, chlorophyll a & b, phenols, and flavonoids, it is clear that growing seedlings in the sand: clay mixture; with 4.5 g/ pot of NPK fertilization gives the highest values of these components. It can be concluded that to obtain vigorous seedlings with a high content of nutrients, phenols, and flavonoids of Inga edulis, they should be grown in a mixture of sand and clay (1: 1 v/v) with monthly fertilizing by 4.5 g/ pot of NPK.