2024-03-29T12:15:23Z
https://jssae.journals.ekb.eg/?_action=export&rf=summon&issue=17426
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Response of Barley Grown on Different Soils to Soil Amendments. استجابة الشعير النامي في أراضي مختلفة لبعض محسنات التربة.
E.
El-Hadidi
M.
El-Sherpiny
S.
Ezzat
Sally
Abo El-Ezz
This study was conducted to assess the effect of compost, agricultural gypsum and sugar beet mud (By-product in a sugar beet manufacturing process) on barley plants (Hordeum vulgare L) grown in pots containing saline clay or nonsaline sandy soil. For this purpose, three different rates of compost, gypsum and sugar beet mud (0.5, 1 and 1.5%, equivalent to 2.5, 5 and 7.5 g pot-1, respectively) were applied to both soils in pots 500 g soil and moisted two weeks before sowing. The used experimental design was a completely randomized design with three replicates for each treatment. Growth parameters (i.e. shoot fresh and dry weights (g plant-1) and No. of plants pot-1) and also elements concentration (i.e. N, P, K, Na, Mg and Ca %) were evaluated. The findings indicated that the obtained values significantly increased with the increase of adding rate of all soil amendments under study, where the highest values were realized due to the addition rate of 1.5% followed by 1% and 0.5%, respectively for all growth parameters and elements concentrations, except K% which suffered from antagonism with calcium that is included in the composition of agricultural gypsum and sugar beet mud. Also, barley grown in the control treatment (without any soil addition) appeared extremely nutrient deficient. Soil applications of compost, gypsum and sugar beet mud positively influenced on barley plants grown on saline and sandy soils. Also, sugar beet mud is beneficial for barley plants grown on studied degraded soils due to its high contents from calcium and organic matter.
compost
gypsum
sugar beet mud
saline and sandy soils
2020
08
01
347
353
https://jssae.journals.ekb.eg/article_114847_0494ac3ea9c7948993cbc7ca7fda7b5f.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Impacts of Irrigation with Sewage Effluent on Physical and Chemical Parameters of Egyptian Soil آثار الري بمياه الصرف الصحي على المعايير الفيزيائية والکيميائية للتربة المصرية
S.
El-Gendi
Nagwa
Badawy
Amina
Hamada
Huda
Hamed
Egypt may soon suffer from water problems due to many factors, including the intransigence of upstream countries in addition to climate change and various pollution factors. Under these circumstances, many farmers are forced to use sewage water for irrigation, which may eventually lead to deterioration of soil and environmental quality. Therefore, the present investigation aims to study the influences of sewage water application for varied extended periods on some physical and chemical parameters of Abu-Rawash soil and to compare between the general properties of sewage effluent water and Nile water. In sewage effluent, Na+ was the dominant cation and EC, SAR, pH, and NH4+ values below the Permissible Maximum Level while nitrate content exceeds the safe level. The total N content in sewaged water was more than 13 folds that of Nile water. In sewage effluent irrigated soils, there are appreciable increases in clay fraction by 8.02 and 12.0 folds compared with the virgin soil. CaCO3 content of soil continuously irrigated with sewage water reduced as increasing period of application while there are an increasing in soil pH and EC. Only remarkably increase in ESP was occurred in the top soil layers of sewage irrigated soils. Bulk density and Hydraulic conductivity of sewaged soil decreases with increasing period of application and total porosity and available water capacity increased. The results reflect deficiency of nutritional status of uncultivated sandy soils in an arid zone, especially in N content.
sewage water
Irrigation
water scarcity
soil properties
2020
08
01
355
362
https://jssae.journals.ekb.eg/article_114851_4035acaaa2eb166bacb6fab44cb01a34.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Predicting Hot Water Production Using Parabolic Trough Solar Collector التنبؤ بإنتاج الماء الساخن باستخدام مجمعات القطع المکافئ للطاقة الشمسية
A.
Kishta
Amany
Metwally
Recently, the problem of high electricity prices appeared in household uses, especially in water heating then the use of solar collectors was the best proposed solution to this problem. A computer program is written to predict domestic hot water production using a parabolic trough collector. The proposed system consists of a parabolic trough collector, a circulating system, a hot water storage tank, and a heat exchanger. The program was used to test the effect of three major design parameters. These parameters are mass flow rate of working fluid (0.50, 0.75 and 1.00 kg/m), collector aperture area (1.0, 1.5 and 2.0 m2), and storage tank capacity (50, 75 and 100kg). The study also revealed that the hot water temperature depends on both storage tank capacity and the collector aperture area. It was concluded that a match between the collector aperture area and storage tank capacity must be taken into consideration when designing a solar hot water production system. The proposed system is capable of produce 60-80 °C, which is satisfactory for domestic hot water production with an average efficiency of 51.50% which is considerable higher compared to other solar collectors. It is recommended to be used system under aperture area of 1.00 m2 and mass flow rate of 0.75 kg/min with 75 kg for storage tank capacity. Finally, a model validation was conducted by comparing the obtained results to those available through literature survey. A good match was found between the study results and published results.
solar energy
Parabolic trough collector
hot water
System Modeling
2020
08
01
363
368
https://jssae.journals.ekb.eg/article_114854_53a0655e6fd5d75a872a457815a8165d.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Economic of Drip Irrigation System in New Reclamination Lands أقتصاديات استخدام نظام الري بالتنقيط في الأراضي حديثة الأستصلاح
E.
Elbanna
A.
Abou El-Magd
M.
Abo-Habaga
E.
Hussin
Irrigation scheduling in terms of frequency rate and duration expresses how water is used on the farm. The technique involves two decisions: - when to irrigate (timing) and how much to apply (quantity) Ideally, they are planned so that adequate water can be delivered to the farm during the peak crop water-use period. This research aims to comparison two irrigation systems the drip irrigation and open furrow irrigation. Split area of 36m2 was designed for both irrigation systems. Onions were planted in these areas. Three moisture content levels were selected for this study namely 100 % (M1), 75 % (M2), and 50 % (M3) of the available water. The results show that the generally, the moisture content decreases at deeper soil layers or being far from the dripper or furrow systems. The electrical conductivity (EC) value increases in horizontal and vertical directions and so chloride. The data indicated that salts are accumulated according to direction of water flow. Generally, the EC and chlorides concentration increased by decreasing the quantities of water applied rates. The salinity increased in the following order: drip and furrow irrigations. Comparing the three different applications water under irrigation systems, a significant relation was remarked. Meanwhile, when the two systems irrigation is compared due to the application water, no significant relation obtained. Under drip irrigation, each k watt of power produced 273 kg of yield in the first season increasing by 73.55 and 64.56 % than the furrow system respectively.
moisture
salinity
Crop yield
WUE
Power requirement
Wadi El- Natrun and Dakahlia Area
Egypt
2020
08
01
369
375
https://jssae.journals.ekb.eg/article_114856_568a6bcec8ebb60f27e2e98a55a20a89.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Simulation of Water Stress and Climate Change Impacts on Canola Yield, Seed Quality and Water Productivity at North Delta, Egypt محاکاة تأثيرات تغير المناخ والإجهاد المائي على محصول وجودة بذور الکانولا وانتاجية وحدة المياه في شمال الدلتا، مصر.
Kh.
El-Hamdi
A.
Khair
H.
Abu Ishwayrib
A field trial was conducted at Sakha Experimental Research Station, Kafr El-Sheikh Governorate, Egypt during the two successive winter seasons of 2018/2019 and 2019/2020 to calibrate and validate the AquaCrop model (Version 5). Two cultivars of canola (Serw4 and Serw6) were sown to study the influence of two irrigation regimes (50 and 70% of soil moisture depletion SMD). Then, AquaCrop model was calibrated using the dataset of 1st season and validated using the 2nd season dataset by different statistical indicators i.e. coefficient of determination (R2) and degree of agreement (d). Also, the simulation of climate change impact on canola yields was done. Results show that mostly, irrigation at 50% depletion from soil moisture gives higher values of seed and biomass yields (Mg ha-1) and canola water productivity compared to 70% depletion from soil moisture. This trend is found with both canola cultivars but the Serw4 records values better than Serw6. Also, results show that AquaCrop model (Version 5) is able to simulate well seed and biomass yield of canola cultivars as well as canola water productivity under different irrigation treatments at the studied region, where, values of R2 and d record a robust agreement among predicted and observed values. As for the simulation of climate change influence, the findings indicate that increasing temperature leads to increasing the reduction percentage of seed yield of different canola cultivars, and the reduction percentage with Serw6 was more than Serw4.
AquaCrop model
calibration
canola
validation
Climate Change
water productivity
2020
08
01
377
383
https://jssae.journals.ekb.eg/article_114857_3f040437bc1da9ece19642b718a0f068.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Net Irrigation Water Requirements for Wheat in Egypt Under Climate Change Conditions عمق ماء الرى الصافى لمحصول القمح في مصر تحت تأثير التغيرات المناخية
M.
Ibrahim
N.
Abd El Fattah
H.
Abd El-Mageed
Egypt appears to be particularly vulnerable to climate change especially with water scarcity problem. Climate change not only affects the temporal and spatial distribution of water resources, but also will increase the crop water consumption ( ). The aim of this study is to estimate the effects of climate change on irrigation requirement ( ) for ''Wheat" at different geographic regions in Egypt: El-Dakahlia, El-Fayoum and Assuit governorates were selected as Lower, Middle and Upper Egypt regions. The climate change data has been obtained from ''MIROC-ESM'' climate model with ''RCP 8.5'' climate scenario during 2018, 2040 and 2080 as a current, short and long term periods respectively. The results showed that the ETc would increase by 5 %, 8 % and 13 % in 2040 but, in 2080 would decrease by 8.5 % in Assuit. Whereas, in El-Dakahlia and El-Fayoum would increase by 8 % and 13 % respectively. The IR values would increase by 12 %, 21 % and 14 % to become ( 636.61 mm/season),(572.3mm/season) and (331.25 mm/season) in 2040 for Assuit, El-Fayoum and El-Dakahlia, respectively. But, expected to decrease in Assuit by 15 % to reach (478.4 mm/season) and increase by 23 % and 17 % to be (584.01 mm/season) and (339.85 mm/season) in 2080 for El-Fayoum and El-Dakahlia, respectively. These results indicated that, climate change would increase the water consumption for wheat in all examined regions in Egypt, and the highest impact would be in Middle and Lower Egypt followed by Upper Egypt during 2040 and 2080.
irrigation water requirement
wheat crop
General circulation Models (GCMs)
Climate change models and scenarios
2020
08
01
385
393
https://jssae.journals.ekb.eg/article_114858_7e41de7c003a30add6b539c9a79e82b8.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Passive Solar Greenhouse Heating Modeling with Watering Polyethylene Tubes نمذجة التدفئة السلبية للأنابيب البلاستيک المملوءة بالماء فى الصوب الزراعية
A.
Taha
A simplified mathematical model based on heat, math transfer and energy balance has been developed which integrate each of solar collector (polyethylene tubes “PE” filled with water), energy storage, and the greenhouse parameters (cover material/ plants/ soil/ air). This model may be useful for understanding the extreme complexity of the heat and mass transfer that influenced by above designing parameters. The model are included temperatures for each of; air inside the greenhouse, soil surface, plant, greenhouse cover, water in PE and relative humidity. Consequently, it can be used to estimate the energy stored in the water and energy fluxes between greenhouse components. The simulation results were compared with those of the experiment depending on the bias error of main and the coefficient of determination. A good agreement was found between measured and expected values. In a greenhouse with height of cucumber plants (Cucumis Sativus l.) 2.2 m and under passive solar collector (water tubes), the minimum average of inside temperature was found in between 3–7°C higher than the outside air temperature and with about 4°C higher than control greenhouse. At January, the collection factor of solar energy for greenhouse with solar tubes increased up to 1.1 times relative to traditional. It can be decided that the current model can be used for an estimate temperatures, energy stored and energy fluxes in the greenhouse use PE filled with water. The developed thermo dynamic model can be further used for optimizing the thermal storage sizes.
Polyethylene tube
solar energy
energy stored
heat transfer
Mathematical Modeling
2020
08
01
395
401
https://jssae.journals.ekb.eg/article_114861_4a8204d9422ce9f07e49582047124dfc.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Evaluation of Vermicompost and Zeolite Ability to Improve Water and Nutrients Retention in A Sandy Soil تقييم قدرة الفيرميکومبوست والزيوليت على تحسين الاحتفاظ بالمياه والمغذيات فى أرض رملية
S.
Abdeen
Improving water retention and nutrients in sandy soils is crucial for agricultural productivity under water shortage. Vermicompost (V) and Zeolite (Z) were applied to soil as alone or mixture to quantify their effect on sandy soil properties, physiological efficiency of nutrientsand water use efficiency of cultivated wheat under three levels of moisture content (100, 80 and 60% from filed capacity) for 60 days in pot experiment. Treatments of vermicompost and zeolite were control-,1 and 2% as alone and 0.5%V+0.5%Z ,0.5%V+1%Z, 1%V+0.5%Z and1%Z+1%V as combined. The mixture of 1% Z+0.5% V had higher fresh and dry weights of wheat, macro nutrients content and uptake by wheat under all levels of moisture content as compared to other treatments. The WUE and Physiological efficiency of NP and K increased significantly by increasing the rates of zeolite and vermicompost either alone or mixture, especially at the lowest moisture content of field capacity. Soil porosity, bulk density, and the availability of soil macronutrients and water were associated by applications of zeolite and vermicompost. So, the synergistic effect of zeolite and vermicompost that carried out during the period of experiment on soil properties and nutrients uptake clearly occurred. Hencethese results are enhancing plant growth under water shortage which can be used to improve, cultivate new areas and to enhance water use efficiency of wheat plant.
Water retention
sandy soil
Zeolite
vermicompost
wheat growth
2020
08
01
403
409
https://jssae.journals.ekb.eg/article_114864_08a71c73f4a3b0b1ae28a62956ffd364.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Irrigation Water Management for Wheat Using Aquacrop Model إدارة مياه الري الحقلي للقمح باستخدام نموذج AquaCrop
M.
Genaidy
The study aimed to evaluate the performance of the Food and Agriculture Organization "AquaCrop" model (version 6.1) in simulating the productivity and biomass of wheat crops in old lands under the surface irrigation system. Field data for the period from 2013- 2016 were used to calibrate the model's through matching productivity and biomass observed using root mean square error (RMSE) 0.05 and 0.2 ton/ha and Nash coefficient values of 0.9 and 0.8, resp. A calibrated model was simulated the grain yield to generate an irrigation schedule with the aim of developing an appropriate irrigation management strategy for wheat. Results showed that the highest value of wheat water production was achieved through the application of five irrigations when applying fixed net application (80 mm) with a total of 400 mm for the season and different interval between irrigation ranges between 30-39 days depended on depilation of the 80% of Readily Available Water (RAW) threshold while taking into rainy mind. This sequence was superior to the normal used irrigation sequence conducted from 2013 to 2016 (fixed net application 80,96mm and fixed interval 27,33 days on six and five irrigations application resp. with a total of 480 mm per season). 16.7% less water use with increasing water productivity is one of the important things at the present time. The results will help determine an irrigation management option appropriate to the prevailing weather conditions and farm resources, and thus this model can be used as a decision support tool in increasing water productivity.
AquaCrop, Irrigation schedule
Canopy cover, wheat productivity, water productivity, management
2020
08
01
411
415
https://jssae.journals.ekb.eg/article_114866_e7fb5c69cd400a44aebbd1acd4775557.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
The Use of A Three-Factor Computer Program in The Evaluation of Compost, Farmyard Manure and Sheep Manure and Its Impacts on some Soil Chemical Properties. استخدام برنامج کمبيوتر ثلاثى العوامل لتقييم الکمبوست والسماد البلدى وسماد الغنم وتأثيرهم على بعض الخصائص الکيميائية للتربة.
E.
El-Maddah
M.
El-Sodany
Y.
Abd-Allah
Two field experiments were conducted on clayey soil during the two seasons (winter 2017/2018 using wheat and summer 2018 using maize) at El-Gemmeiza Agricultural Research Station, El-Gharbia Governorate to evaluate some natural organic amendments on improving some soil chemical properties and macronutrients status (N PK) and their availability for plants. Furthermore, economical analysis was done to determine the economical treatment. The experiments were designed in a randomized complete block design with three replicates. Thirteen treatments having different compost, farmyard manure and sheep manure were used to cover all possible combinations as well as control (without any addition). The results were shown in a triangle diagram using a special computer program. Results can be summarized as follows: All treatments play a positive role on reducing soil pH, soluble Na, SAR values, Ex Na and ESP and progressive increasing in soil EC, soluble cations and anions, total soluble salts, O.C, C/N ratio and significantly increases in Ex Ca, Mg, K and CEC at the two soil depths (0-20 and 20-40 cm) in the two seasons compared with the control and clearly enhanced total macronutrients status of the investigated soil. Economical analysis indicate that the highest net income value (11960.06LE Fed-1) was incorporated with combination consists of 50% C and 50% Sh. Therefore, it is more useful to use those treatments (compost, FYM and sheep manure) and their combination to get a markedly improve in both chemical properties and macronutrients, which reflect on plants growth incorporated with high net revenue.
compost
farmyard manure
sheep manure and soil chemical properties
2020
08
01
417
430
https://jssae.journals.ekb.eg/article_114868_391ef49a18d84d1f8cbe20b3ca69f9a6.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Monitoring Spatio-Temporal Changes in Vegetation Cover, Soil Salinity and Waterlogging in Siwa Oasis, Egypt Using Remote Sensing Data and Techniques رصد التغيرات المکانية والزمانية في الغطاء النباتي وملوحة التربة والغدق بالمياه في واحة سيوة ، مصر باستخدام بيانات وتقنيات الاستشعار عن بعد
A.
Elnaggar
The availability of groundwater resources makes Siwa Oasis a potential region for agricultural projects in the western-desert of Egypt. This region, however, faces serious environmental problems such as water-logging and consequently soil salinization. Accordingly, the primary objectives of this research were to monitor and evaluate spatio-temporal changes in vegetation cover, water-logging and soil salinity in Siwa Oasis using remote sensing (RS) data and techniques. Therefore, Landsat images were acquired at four different periods (1986, 2000, 2013 and 2019), pre-processed and analyzed. Three spectral indices were used for studying the spatio-temporal changes in the mentioned land covers. These indices are the Optimized Soil Adjusted Vegetation Index (OSAVI), the Normalized Difference Water Index (NDWI) and the Salinity Index (SI). The obtained results indicated that the studied land covers were predicted at higher accuracy. Vegetated lands were increased from 19.64 km2 in 1986 to 94.58 km2 in 2019. Water-logging areas also increased from 19.42 to 57.00 km2 during the same period. However, sabkha areas decreased from 32.96 to 28.32 km2. The increase in water-logging areas could be attributed to the increase in vegetated lands, use of inefficient irrigation systems and poor drainage in the closed depression. This, in turn, affects the residential buildings in the Old City as well as the agricultural lands in the low-lying areas of the Oasis. In conclusion, Siwa Oasis is in urgent need for developing an effective land management program, which should be taken into account using more effective irrigation systems and enhancing agricultural drainage in the area.
Siwa Oasis
Remote Sensing
soil-salinity
water-logging
vegetation cover
2020
08
01
431
436
https://jssae.journals.ekb.eg/article_114872_a1eb651acdc83d7a1da555720f4c8028.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Effectiveness of Gypsum Particle Size and Vermicompost in Reclaiming Salt Affected Soils and Faba Beans Productivity فاعلية استخدام احجام مختلفة من الجبس،والفيرم کمبوست فى استصلاح الاراضى المتأثرة بالاملاح وانتاجية محصول الفول البلدي
Sahar
Rashed
M.
Ibrahim
Soil salinity is one of the environmental factors limiting the plant growth and soil productivity. Field experiment was conducted during 2018/2019 and 2019/2020 seasons in El Hamoul district, Kafr El-Sheikh Governorate, Egypt. This study aimed to investigate the effect of soil amendments via. VC and gypsumparticle size on some soil physical and chemical properties and faba beans productivity in salt affected soil. The experiment was conducted in split plot design with three replicates. VC with four rates; VC0, VC1, VC2 and VC3 were placed in main plots, while gypsum particle size with three sizes; G1, G2 and G3 was placed in sub-plots. The results revealed that the application of VC3 combined with the G3 recorded the highest decreases in soil ECe and BD (18.97% and 8.87%, respectively) compared to the initial soil values. While RSE, total porosity, OM, CEC and soil nutrient contents were increased with the same combination by (27.62, 9.78%, 48.94%, 22.42%, 18.00, 20.91 and 19.09%) respectively compared to the initial soil values. Also, the application of VC3 combined with G3 achieved the highest values of 100-seed weight (69.20 and 78.36 g), plant height (81.03 and 84.93 cm), pods yield (6.23 and 6.60 Mg.ha-1) and seeds yield (4.02 and 4.39 Mg.ha-1) of faba bean in the 1st and 2nd seasons, respectively as compared to G1. Data also, revealed that the G3 were more effective than G1 on reclaiming the salt affected soil and faba beans yield.
Soil salinity
vermicompost
gypsum
soil properties and Faba beans
2020
08
01
437
444
https://jssae.journals.ekb.eg/article_114875_4cf99b87d75e86887da2a3af95814f6e.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Applying Modern Surveying Techniques and Simulation Models for The Rehabilitation of Main Canals in Egypt: Case Study – El-Bagoriya Canal تطبيق تقنيات المسح الحديثة ونماذج المحاکاة الهيدروليکية لإعادة تأهيل الترع الرئيسية في مصر دراسة حالة - قناة الباجورية
T.
El-Gamal
M.
El-Gazzar
El-Bagoriya canal is a main canal in the Middle Delta and it is the main water source for West Kafr El-Sheikh irrigation directorate. As originally a natural canal, El-Bagoriya canal has specific characteristics that affected its hydraulic performance, and which resulted in a problem in conveying required water supply to downstream irrigation directorates. With the installation of two new municipal stations on the canal, there was a plan to dredge the canal inside El-Monofiya irrigation directorate to increase its hydraulic capacity. A research project was conducted to help the irrigation directorate implementing the dredging in the best way. The research activities included surveying the cross sections using modern surveying techniques, using ArcMap program to develop contour maps from the surveyed points and derive cross sections from these counter maps. The activities also included using the simulation model to check the original situation, the suggested dredging scenario, and the actual dredging. The results showed that the suggested dredging could improve the flow inside the investigated reach from 53.5 m3/sec to 64.5 m3/sec while maintaining minimum water slope inside the reach. Actual dredging could improve the flow inside this reach to 57.5 m3/sec while maintaining the same water slopes.
Main Canals
Water Management, Rehabilitation
2020
08
01
445
454
https://jssae.journals.ekb.eg/article_114878_21780e109b0c4bc5ae6f37ab0c81cb80.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
The Assessment of Pad-Fan Evaporative Cooling System in Broiler Housing تقدير معايير نظام وسادة – مروحة للتبريد بالتبخير فى مساکن دجاج التسمين
M.
Ghoname
An investigation was executed to study the impact of using different thicknesses for pad cooling and various airflow rates on the cooling system effectiveness inside the house of broilers and on its performance in the summer of 2019, Egypt (latitude angle of 30.42°N and longitude angle of 30.59°E). The trial was done using 20, 30, 40, and 50 m3 /s. airflow rates, As well as using ten and fifteen cm pad thickness. The experimental work results' pointed to using a pad cooling system with fifteen cm pad thickness with 20, 30, 40, and 50 m3 /s airflow rates increase the temperature cooling effect by 25.54, 30.89, 13.36, and 44.63 % comparing with using ten cm pad thickness for the same previous flow rates, respectively. Cooling efficiency increased by 24.73, 29.5, 12.17, and 44.46% when using a cooling system with fifteen cm pad thickness comparing with using a cooling system with ten cm pad thickness for 20, 30, 40, and 50 m3/s airflow rates, respectively. The average value of pad water consumption decreased by 57 % when using a fifteen cm pad cooling system compared to a 10 cm pad cooling system. The lowest mean value for T.H.I. was 25.4°C at an airflow rate of 50 m3/s for fifteen cm pad thickness. Reared birds in the house with fifteen cm pad cooling thickness were not stressed, according to T.H.I. Value and thus lead to increasing the production Efficiency factor by 17.91% comparing with using a ten cm pad cooling system.
airflow rate
pad thickness
and temperature-humidity index
2020
08
01
455
466
https://jssae.journals.ekb.eg/article_114880_17338cc357ead854b0900f6abe6f1646.pdf
Journal of Soil Sciences and Agricultural Engineering
2090-3685
2090-3685
2020
11
8
Optimized Design on Hydrant under Surface Irrigation Systems تصميم معدّل لمحبس تحت نظام الرى السطحى
A.
Mohammed
The research aimed to modify the traditional hydrant to suit connect with the newly irrigation systems. Through evaluate the performance of the traditional "HT" and modified "HD" hydrants of the surface irrigation system applied in clay soil at KafrAldoar- El-Beheira Governorate. In summer season 2019 by cultivated the corn variety of S.C 2031. Then, the results concluded that the "HD" is shallow less than the "HT" in Zf and Es but great reduction in cv and α. While it is little increase in pd, UC, DU and Ea. The "HD" can saved advance and recession time about39.02 and 29.46%, respectively, compared with "HT" in 80 m furrow length. As it was observed, the water depth reached the recommended depth for corn plants in both hydrants for most of the length of the line, but the depth when using the modified hydrant was slightly less than the traditional hydrant. The yield and WUS increased by using "HD" about 9.07 and 28.61 % than the "HT". But it decreases the water applied about 15.16 %.The recommendation on this research is the modified hydrant can safe to use and can be generalized in the irrigation net under the surface and newly irrigation systems.
hydrant
water infiltration depth
Advance and recession time
distribution uniformity
storage efficiencies
water use efficiency
2020
08
01
467
472
https://jssae.journals.ekb.eg/article_114883_7177264ee45f7e926e8e8aa8879d6889.pdf