Dr. Adel M O H A M E D Ghoneim
Dr. Adel Moahmed GHONEIM is Associate Professor of Soil Chemistry and Fertility in the King Saudi University. Dr. GHONEIM obtained his Ph.D in Environmental Soil Chemistry from the Ehime University, Japan 2002 and Postdoc in Soil Fertility and Plant Nutrition from Ehime University, Japan (2003-2005), Research Associate at Department of Life Environment Conservation Science, Ehime University, Japan from April, 2006-March, 2007 and Visiting Research Fellowship from Japan International Research Center for Agricultural Sciences (JIRCAS), Japan (2008,). Dr. GHONEIM field of interests are: Soil-plant Interaction, Nutrients dynamics, Sustainable Agriculture, Heavy metal contamination in terrestrial ecosystem, Zeolite synthesis, characterization and application and Rehabilitate of contaminated soils.
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recovery of Pb in both soils achieving superiority in loamy sand soil. The Pb distributed in the soil columns ranged between soil leaching solutions and sorbed phase, of which the greater portion was in the sorbed phase. Lead move slowly through soils
columns and the distance of movement was about 5 cm to the soil surface and then the concentrations decreased down the soil columns and later disappeared beyond a depth of to 7 cm. Mass balance calculations of Pb according to the HYDRUS-2D
mathematical model resulted in values that were similar to those of the experimental data (error ≤ 5%). A soil quality indicator is considered as a key element of sustainable agriculture and hence soil quality plays an important role in deciding the MSWA
methods.
compost ability and chemical characteristics of resulting compost are not widely studied. Therefore, the aim of this study was to evaluate the characterization of the municipal organic wastes fraction and
composting process. In this study, the organic fraction of MSW was composted alone or with a chemical and/or organic additives using a windrows composting system for a period of 12 weeks. Changes in
temperature, EC, pH, C/N ratio, total contents of Zn, Fe, Mn, Cu, Cr, Cd, and Pb were monitored over a regular interval throughout the composting process. All the measured parameters showed great
differences among types of compost. The results indicated that medium temperature range was 33-64ºC, EC was 2.85-4.50 dS m-1, and pH was 7.50-8.50. Moreover, C/N ratio was found within the acceptable
average range (8.0-15). The produced composts contained a high level of total N (1.80 %), total P (0.50 %), and total K (0.25 %). The total contents of Zn, Fe, Mn, Cu, Cd, Cr, and Pb were within the permissible limits for compost.
g-PAM) has been prepared in order to deliver the phosphate fertilizer to the plant at a constant rate thereby.
This system aims to increase fertilizer phosphorus use efficiency (FPUE) and maintain a hydration level for the
plant at the same time. Two types of starch phosphate monoesters were prepared using mono-ammonium (MAP) and di-ammonium phosphate (DAP). First, starch was converted to carboxymethyl starch and then was phosphorylated with mono-ammonium dihydrogen phosphate and di-ammonium dihydrogen phosphate.
After phosphorylation, the samples were grafted with acrylamide in the presence of methylene bisacrylamide as a crosslinking agent. The prepared systems of P-CMS-g-PAM were differently characterized by Fourier transformer infrared (FT-IR), thermogravimetric analysis (TGA), scanning electron microscope (SEM) and phosphorous analysis. The swelling behavior was investigated. The kinetics of grafting reaction were also studied. The release behavior of phosphate bound was studied at pH 7 and 25 °C. The mechanism of the phosphate release from P-CMS-g-PAM was examined using the Korsmeyer-Peppas model.
fertilization is a major objective to increase nitrogen
use efficiency by rice varieties. Field experiments were
conducted during 2016 and 2017 growing seasons to
evaluate the efficiency of varying nitrogen fertilizer rates
on growth and yield parameters, along with nitrogen use
efficiency of some newly released rice varieties (Sakha
108) and some promising lines GZ9399-4-1-1-3-2-2, GZ10101-
5-1-1-1 and GZ10154-3-1-1-1. Five nitrogen levels (i.e. 0, 55,
110, 165 and 220 kg N ha-1) were used. The results from both
growing seasons indicated that, Sakha 108 recorded the
highest grain yield while GZ10154 and GZ10101 recorded
the lowest grain yields. A linear increase in grain yield
was observed with continuous rate increase of nitrogen
from 0 to 220 kg ha-1, while 220 kg N ha-1 treatment showed
maximum grain yield followed by 165 kg N ha-1, with
control as minimum. Agronomic nitrogen use efficiency
(AE) for studied rice genotypes varied significantly, and
ranged from 3.63 to 32.9 and from 2.72 to 34.12 kg grain
yield produced per kg of nitrogen applied in 2016 and 2017
respectively. Across N levels, GZ9399 recorded the highest
values of AE for the nitrogen fertilizer rate of 165 kg N ha-1
in both seasons.
recovery of Pb in both soils achieving superiority in loamy sand soil. The Pb distributed in the soil columns ranged between soil leaching solutions and sorbed phase, of which the greater portion was in the sorbed phase. Lead move slowly through soils
columns and the distance of movement was about 5 cm to the soil surface and then the concentrations decreased down the soil columns and later disappeared beyond a depth of to 7 cm. Mass balance calculations of Pb according to the HYDRUS-2D
mathematical model resulted in values that were similar to those of the experimental data (error ≤ 5%). A soil quality indicator is considered as a key element of sustainable agriculture and hence soil quality plays an important role in deciding the MSWA
methods.
compost ability and chemical characteristics of resulting compost are not widely studied. Therefore, the aim of this study was to evaluate the characterization of the municipal organic wastes fraction and
composting process. In this study, the organic fraction of MSW was composted alone or with a chemical and/or organic additives using a windrows composting system for a period of 12 weeks. Changes in
temperature, EC, pH, C/N ratio, total contents of Zn, Fe, Mn, Cu, Cr, Cd, and Pb were monitored over a regular interval throughout the composting process. All the measured parameters showed great
differences among types of compost. The results indicated that medium temperature range was 33-64ºC, EC was 2.85-4.50 dS m-1, and pH was 7.50-8.50. Moreover, C/N ratio was found within the acceptable
average range (8.0-15). The produced composts contained a high level of total N (1.80 %), total P (0.50 %), and total K (0.25 %). The total contents of Zn, Fe, Mn, Cu, Cd, Cr, and Pb were within the permissible limits for compost.
g-PAM) has been prepared in order to deliver the phosphate fertilizer to the plant at a constant rate thereby.
This system aims to increase fertilizer phosphorus use efficiency (FPUE) and maintain a hydration level for the
plant at the same time. Two types of starch phosphate monoesters were prepared using mono-ammonium (MAP) and di-ammonium phosphate (DAP). First, starch was converted to carboxymethyl starch and then was phosphorylated with mono-ammonium dihydrogen phosphate and di-ammonium dihydrogen phosphate.
After phosphorylation, the samples were grafted with acrylamide in the presence of methylene bisacrylamide as a crosslinking agent. The prepared systems of P-CMS-g-PAM were differently characterized by Fourier transformer infrared (FT-IR), thermogravimetric analysis (TGA), scanning electron microscope (SEM) and phosphorous analysis. The swelling behavior was investigated. The kinetics of grafting reaction were also studied. The release behavior of phosphate bound was studied at pH 7 and 25 °C. The mechanism of the phosphate release from P-CMS-g-PAM was examined using the Korsmeyer-Peppas model.
fertilization is a major objective to increase nitrogen
use efficiency by rice varieties. Field experiments were
conducted during 2016 and 2017 growing seasons to
evaluate the efficiency of varying nitrogen fertilizer rates
on growth and yield parameters, along with nitrogen use
efficiency of some newly released rice varieties (Sakha
108) and some promising lines GZ9399-4-1-1-3-2-2, GZ10101-
5-1-1-1 and GZ10154-3-1-1-1. Five nitrogen levels (i.e. 0, 55,
110, 165 and 220 kg N ha-1) were used. The results from both
growing seasons indicated that, Sakha 108 recorded the
highest grain yield while GZ10154 and GZ10101 recorded
the lowest grain yields. A linear increase in grain yield
was observed with continuous rate increase of nitrogen
from 0 to 220 kg ha-1, while 220 kg N ha-1 treatment showed
maximum grain yield followed by 165 kg N ha-1, with
control as minimum. Agronomic nitrogen use efficiency
(AE) for studied rice genotypes varied significantly, and
ranged from 3.63 to 32.9 and from 2.72 to 34.12 kg grain
yield produced per kg of nitrogen applied in 2016 and 2017
respectively. Across N levels, GZ9399 recorded the highest
values of AE for the nitrogen fertilizer rate of 165 kg N ha-1
in both seasons.