Management of Biogate-Fert Technique Based on a Simulation Model

Biogate-fert technique ensures to optimization of fertilizer and water units yield of the potato crop. There were two field tests conducted in the growing seasons. 2019-2020 and 2020-2021, at the research farm of the National Research Centre in Nubaria region, Egypt to study the management of biogate-fert technique based on a developed SALTMED model on potato crop under drip irrigation system in sandy soil conditions. According to the findings, the SALTMED model demonstrated its capacity to forecast soil moisture availability, yield, total dry matter, and nitrogen (ppm) for two growing seasons when using mineral and biogte- fert approaches., In order to maximize crop production and nitrogen levels, the model can calculate how much irrigation supply will be needed to move the soil moisture profile from a given soil moisture to a target soil moisture. Furthermore, accurate estimation of the solute and nutrient status and uptake at the same time is contingent upon accurate simulation of nitrogen and soil moisture

Enhancing the performance of blown asphalt binder using waste EVA copolymer (WEVA)

Air blowing of asphalt generally decreases the penetration value of asphalt binder so that asphalt becomes more brittle and more susceptible to crack during thermal cycling. The aim of this study is to improve the elasticity of blown asphalt upon blending with 3%, 5%, and 7% by weight of thermoplastic waste EVA copolymer (WEVA). Physico-chemical characteristics of blended samples like (FTIR and TGA) were discussed. In addition, the physical properties including penetration test, softening point, ductility test, and elastic recovery were studied. The chemical constituents of asphalt binder including oils, resins, and asphaltenes fractions were investigated using solvent extraction technique. Also, the flow properties of dynamic viscometer at different shear rate were also measured. Moreover, the mechanical properties including storage modulus, tan δ, and stress relaxation were analyzed with dynamic mechanical analyzer at temperature range (20 °C–80 °C). The sample blended with 5%WEVA demonstrated an enhancement in storage modulus and elastic recovery and decrease in tan δ. Finally the prepared blends were applied on carbon steel panel, the paints showed an improvement in properties such as flexibility, hardness and drying times with good adhesion. The overall results approved that blending with 5 wt% (WEVA) improve the performance of blown asphalt binder. Keywords: Air blowing, Crack, Elasticity, Storage modulus, Hardness, Waste ethylene vinyle acetate copolymer (WEVA

Predicting soil moisture distribution, dry matter, water productivity and potato yield under a modified ‎gated pipe irrigation system: SALTMED model application using field experimental data

The use of gated pipes in surface irrigation helps to reduce water losses commonly associated with the use of the traditional furrows. This study focused on predicting soil moisture content‎, total dry matter, crop yield and water productivity of potato crop using traditional and modified, self-compensating gate outlet (SCGO) gated pipe using the SALTMED model to explore the model suitability to identify the optimum and economic gate spacings. The traditional gated pipes are known to exhibit a range of pressure head variations along the pipeline causing a non-uniform discharge from orifices while the modified gate pipe system, known as compensating gated pipes (SCGO) stabilizes the pressure heads and produce more uniform water discharge along the pipe line. The effect of three gate spacings (0.7, 1.0 and 1.5 m) was studied in a field experiment that has been conducted for two successive seasons, 2011–2012 and 2012–2013. The SALTMED model has been applied and showed excellent agreement between the simulated and observed soil moisture, dry matter, yield and water productivity. Similar to the field results, the simulated values indicated that the modified (SCGO), with the 1.5 m gate spacing, gave the highest yield and water productivity. The modified gated pipe received less water than the traditional gated pipe, due to its high application efficiency. In addition to water saving, there is an economic benefit for using 1.5 m gate spacings as its cost is low (14 gates per 21 m pipe length) in comparison with 1.0 m and 0.7 m spacings. The results confirmed SALTMED ability to simulate with high precision, soil moisture, dry matter, water productivity and yield for potato under gated pipe irrigation. Therefore, the model can be used for design purposes to identify the optimum and economic gate spacings without the need to conduct expensive, costly and labor intensive field trials

Management of Biogate-Fert Technique Based on a Simulation Model

Biogate-fert technique ensures to optimization of fertilizer and water units yield of the potato crop. There were two field tests conducted in the growing seasons. 2019-2020 and 2020-2021, at the research farm of the National Research Centre in Nubaria region, Egypt to study the management of biogate-fert technique based on a developed SALTMED model on potato crop under drip irrigation system in sandy soil conditions. According to the findings, the SALTMED model demonstrated its capacity to forecast soil moisture availability, yield, total dry matter, and nitrogen (ppm) for two growing seasons when using mineral and biogte- fert approaches., In order to maximize crop production and nitrogen levels, the model can calculate how much irrigation supply will be needed to move the soil moisture profile from a given soil moisture to a target soil moisture. Furthermore, accurate estimation of the solute and nutrient status and uptake at the same time is contingent upon accurate simulation of nitrogen and soil moisture