Papers by Ahmed M . Saudi
This review is a follow-up to our previous review titled "comprehensive review of progress made i... more This review is a follow-up to our previous review titled "comprehensive review of progress made in soil electrokinetic research during 1993-2020, Part I: process design modifications with brief summaries of main output". In this review, we have summarized the material additives that are utilized for the enhancement of soil electrokinetic remediation (SEKR) efficiency within the last four years (2017-2020). This review has been divided into six subjects according to determined SEKR categories including removal of inorganic contaminants, removal of organic contaminants, SEKR enhancement using permeable reactive barrier (PRB), SEKR for solidification and soil improvement, SEKR enhancement using an oxidation process, and SEKR enhancement using bioremediation and phytoremediation. Various enhancement materials have been added to improve the primary endeavors of SEKR and the summaries of the output were included in this review. In the SEKR experiments in which inorganic and organic contaminants were removed, the process was evaluated based on the process driving mechanism, particularly electromigration and electro-osmosis. Once the performance of SEKR was inefficient, the SEKR processing was integrated with PRB, oxidation, and bioremediation for significant improvements in SEKR performance. Therefore, the primary aim of our review is to provide a comparison of material additives for the SEKR removal intensification process from 2017 to 2020 to provide a review of the past materials that improved the SEKR performances and to simplify future innovation. During 2017-2020, SEKR studies focused on inorganic and organic contaminants remediation, whereas, few SEKR studies have focused on solidification and soil improvement. The SEKR has been utilized for dewatering, but in this case, the materials added were limited. The insufficient of relevant information on this subject was our primary motivation to write this review.
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Nutrient Cycling in Agroecosystems
The critical nitrogen (N) dilution curve, which expresses whole-plant critical N concentration as... more The critical nitrogen (N) dilution curve, which expresses whole-plant critical N concentration as a function of shoot biomass, can be used as a N management diagnostic tool for cereals. The objectives of this research were to develop a critical N dilution curve for wheat grown in calcareous soils and to formulate a model for estimating N fertilizer requirement of wheat crop at different growth stages. Six N fertilization rates (0–250 kg N ha−1) were used to induce variability in plant growth throughout six site-years (three locations at West Delta of Egypt and two seasons [2020/21-2021/22]). Aboveground shoot biomass (W; Mg DM [dry matter] ha−1) and N concentration (Nc; g kg−1 DM) were determined on five sampling dates during the growing season. A critical N dilution curve was developed as: $${N}_{\mathrm{c}}=50.141 {\mathrm{W}}^{-0.424}$$ N c = 50.141 W - 0.424 . The Nc dilution curve was then used to develop a N fertilizer topdressing strategy. The study relied on N nutrition inde...
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Developing a nitrogen fertilizer management model for wheat in calcareous soils using the critical nitrogen dilution curve, 2023
The critical nitrogen (N) dilution curve, which expresses whole-plant critical N concentration as... more The critical nitrogen (N) dilution curve, which expresses whole-plant critical N concentration as a function of shoot biomass, can be used as a N management diagnostic tool for cereals. The objectives of this research were to develop a critical N dilution curve for wheat grown in calcareous soils and to formulate a model for estimating N fertilizer requirement of wheat crop at different growth stages. Six N fertilization rates (0-250 kg N ha −1) were used to induce variability in plant growth throughout six siteyears (three locations at West Delta of Egypt and two seasons [2020/21-2021/22]). Aboveground shoot biomass (W; Mg DM [dry matter] ha −1) and N concentration (N c ; g kg −1 DM) were determined on five sampling dates during the growing season. A critical N dilution curve was developed as: N c = 50.141W −0.424. The N c dilution curve was then used to develop a N fertilizer topdressing strategy. The study relied on N nutrition index inferred from the N c based on N uptake, and instead of relying on a single N recovery efficiency coefficient, a variable N recovery efficiency was developed. This approach increased the hypothetical N requirements at low N application rates while decreased requirements at high N application rates, implying that the N c dilution curve can be used successfully to estimate the rates of supplemental N application. The developed strategy will provide a solid basis for precisely managing N fertilizer, though challenge ahead at the farm level will be in determining the actual shoot biomass and N concentration.
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South African Journal of Chemical Engineering
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Bioscience Research, 2018
Jatropha curcas L. is an auspicious biofuel crop with commercial plantations. Seed oils are non-e... more Jatropha curcas L. is an auspicious biofuel crop with commercial plantations. Seed oils are non-edible and do not compete with food production. However, it is a semi-domesticated species with unknown yield potential and nutritional requirements. Therefore, field trials were conducted at the farm attached to the Waste Water Treatment Plant located at Abu Rawash, Giza Governorate, Egypt. The trial was for two consecutive years (2013-2014 and 2014-2015) in three years old J. curcas plantation. Each plant was raised in a 2×3m plot in a sandy soil. The effect of N, P, and K on seed yield, oil content, and oil yield were evaluated. The treatments were three rates of K; 0.0, 30 and 60 g K2O/plant; four rates of P; 0.0, 50, 100 and 200 g P2O5/plant; and four rates of N; 0.0, 25, 50 and 100 g N/plant, using flood irrigation with sewage effluents. The treatment K0P0N100 produced the highest seed yields at 2.56 T/ha and 4.05 T/ha furthermore, the seed oil yields were 0.79 and 1.19 T/ha in each season. In conclusion, applications of N fertilizer proved to be valuable for Jatropha curcas in Egypt.
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Papers by Ahmed M . Saudi