@article { author = {}, title = {Sorption-Desorption Hysteresis of Cd and Pb on Alluvial Soils as Affected by Clay Content}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {347-363}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1555}, abstract = {ADSORPTION hysteresis in natural sorbents has important …….environmental implications for pollutant transport and bioavailability. The objective was to assess and compare the competitive adsorption and desorption capacities and adsorption hysteresis of Cd2+and Pb2+on four natural soils with different clay contents (10%, 20%, 40% and 50%, hereafter referred to S10, S20, S40 and S50) in terms of their physical and chemical properties. The adsorption-desorption hysteresis of Cd2+and Pb2+ were characterized using linear, Freundlich and Langmuir equations. In all soils Pb2+ was invariably sorbed and retained to a greater extent than Cd2+. Based on hysteresis index, Pb2+ was less mobile than Cd2+ in the studied soils. The adsorption and retention of Cd2+ and Pb2+were most influenced by pH, cation exchange capacity (CEC), total amorphous material percent (TAM%), total organic carbon percent (TOC%) and clay content. In all the soils Cd2+ exhibited greater hysteresis than Pb2+. The amounts of Cd2+ and Pb2+ desorbed from S10 were more than from S50, indicating that S50 was a more effective sorbent for water and wastewater treatment and clay content was the individual soil property most markedly influencing Cd2+ and Pb2+ adsorption and retention.   Keywords: Hysteresis, Adsorption, Desorption, Heavy metals.   DSORPTION hysteresis in natural sorbents has important …….environmental implications for pollutant transport and bioavailability. The objective was to assess and compare the competitive adsorption and desorption capacities and adsorption hysteresis of Cd2+and Pb2+on four natural soils with different clay contents (10%, 20%, 40% and 50%, hereafter referred to S10, S20, S40 and S50) in terms of their physical and chemical properties. The adsorption-desorption hysteresis of Cd2+and Pb2+ were characterized using linear, Freundlich and Langmuir equations. In all soils Pb2+ was invariably sorbed and retained to a greater extent than Cd2+. Based on hysteresis index, Pb2+ was less mobile than Cd2+ in the studied soils. The adsorption and retention of Cd2+ and Pb2+were most influenced by pH, cation exchange capacity (CEC), total amorphous material percent (TAM%), total organic carbon percent (TOC%) and clay content. In all the soils Cd2+ exhibited greater hysteresis than Pb2+. The amounts of Cd2+ and Pb2+ desorbed from S10 were more than from S50, indicating that S50 was a more effective sorbent for water and wastewater treatment and clay content was the individual soil property most markedly influencing Cd2+ and Pb2+ adsorption and retention.    }, keywords = {Hysteresis,Adsorption,desorption,Heavy metals}, url = {https://ejss.journals.ekb.eg/article_1555.html}, eprint = {https://ejss.journals.ekb.eg/article_1555_232d52f51d6fb90b4877f28a78c9a4da.pdf} } @article { author = {}, title = {Evaluation of Different Plant Active Iron Extractants under Conditions of Egypt}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {365-389}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1563}, abstract = {    IRON status in sixty one soils of Egypt cultivated with corn was studied by determining their total and available (DTPA), iron content, and active iron in plant using different methods by determination of Fe in leaf below and opposites the ear collected at silking stage.   The amount of soil available iron extracted by the DTPA method ranged from 1.48 to 14.80 mg/kg Fe. According to the critical level of available iron in soil (4.5 mg Fe/kg), the data showed that 57% of the tested soils contain adequate quantities, while 23% are within the margin range, and only 20% are deficient.           As regards the concentration of Fe in the dry leaves collected during silking stage from corn plants ranged from 208 to 625 mg/kg Fe. The average values of active iron in leaves extracted by EDTA, DTPA, O-Ph., 2,2’ Bip. and HCl  were 33.78, 46.95, 65.07, 100.43, and 140.74 mg/kg Fe, respectively.   A highly significant positive correlation coefficient was obtained between the values of plant active iron extracted by any of the five extractants and DTPA-soil available Fe. These results clearly demonstrate that active iron extracted by the five solutions is favorable to be used for separating iron-deficient from non-deficient plants.    The critical values of active iron extracted by EDTA, DTPA, O-Ph., 2, 2’Bip. and HCl were  40.0, 55.00, 80.00, 120.00 and 180.00 mg/kg Fe, respectively. According to these values, 59, 65, 57, 46 and 62% of the soils studied are classified as deficient, respectively. Moreover applying the critical value of Fe soil-DTPA, less than 4.5 mg/kg proved that 43% of the studied soils are in the deficiency range, In this respect, it is obvious that such value coincides well with that obtained by the 2,2’Bip plant active iron (46%). On the other hand, the price of 2,2’Bip is so high (one Kg= 15000 L.E) that makes, from the economical point of view, the use of 2,2’ Bip is excluded. Moreover, since the other extractants gave reliable results the EDTA is very suitable according to its low price(one Kg= 40 L.E).    }, keywords = {Active iron,Corn plant,Egyptian soils,Extractants}, url = {https://ejss.journals.ekb.eg/article_1563.html}, eprint = {https://ejss.journals.ekb.eg/article_1563_6a92b6b3e83281d23b346f408b9c54b5.pdf} } @article { author = {}, title = {Active Iron in Tomato Plants as Affected by Potassium to Calcium Ratio Applied to the Soil}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {391-408}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1558}, abstract = {}, keywords = {Active iron,Chemical extractants,tomato plants}, url = {https://ejss.journals.ekb.eg/article_1558.html}, eprint = {https://ejss.journals.ekb.eg/article_1558_d8e08f554f3d00dc8df16c26d579a1ca.pdf} } @article { author = {}, title = {Assessment of Sustainable Agricultural Land Management by Using GIS Techniques in North Delta, Egypt}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {409-424}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1559}, abstract = {THE SUITABILITY of five chemical extractants (EDTA, DTPA, O-Ph, 2,2'Bip and HCl) to estimate the amount of active iron, is studied in greenhouse experiments, using tomato plants. Different levels of Fe (0, 5 and 10 ppm) in combination with various ratios of K: Ca fertilization (1:20, 1:10 and 1:5) were used. The shoots of the harvested plants after 60 and 75 days from planting were analyzed for their total Fe, K, Ca, P and active Fe content as extracted by the abovementioned extractants.   The highest dry matter yield of tomato shoots at the two stages of growth were associated with 0 ppm Fe and 1:20 (K: Ca) ratio treatment and the least yield was recorded at the case of 0 ppm Fe and 1:5 (K: Ca) ratio. Iron application significantly increased the Ca content of the plants but decreased both K and P, while total iron showed an insignificant increase. Increasing K: Ca ratio increased K, P and Fe but decreased Ca content.   Active iron extracted using the previous methods increased with iron application increment and decreased by increasing K: Ca ratio. The extractability power, of the five solutions has the following ascending order: EDTA < DTPA < O.Ph < 2,2'Bip < HCl.   The data illustrate that deficiency is expected at active iron levels less than 58, 67, 116, 146 and 221 (mg/kg), for the 60-days old tomato shoots, and 49, 56, 63, 84 and 105 (mg/kg) for the 75 days old tomato shoots in the same order.}, keywords = {Sustainable Agricultural Land Management,GIS,North Delta,Egypt}, url = {https://ejss.journals.ekb.eg/article_1559.html}, eprint = {https://ejss.journals.ekb.eg/article_1559_227b1d1a70eb5e3bcadf52e40b8d77d6.pdf} } @article { author = {}, title = {Effect of Different Tillage Practices and Two Cropping Patterns on Soil Properties and Crop Productivity}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {425-440}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1560}, abstract = {}, keywords = {}, url = {https://ejss.journals.ekb.eg/article_1560.html}, eprint = {https://ejss.journals.ekb.eg/article_1560_3cb3b6ac25f1aa5ae4e7cb3f84204b8a.pdf} } @article { author = {}, title = {Effect of Magnetic Iron Oxide Combined with some Additives on the Yield of Groundnut, Wheat and Nutrient Availability in Sandy Soil}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {441-452}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1561}, abstract = {}, keywords = {Keywords: Sandy soil,super phosphate,Bentonite,magnetic iron ore,Bio-fertilizers (Phosphorine),Groundnut,Wheat}, url = {https://ejss.journals.ekb.eg/article_1561.html}, eprint = {https://ejss.journals.ekb.eg/article_1561_27f630f5f098284033458f17c0dc9cdc.pdf} } @article { author = {}, title = {In-Situ Remediation of Heavy Metals in Sewage Sludge Using Some Pesticides and Inorganic Amendments}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {453-462}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1562}, abstract = {}, keywords = {Sewage Sludge,Zeolite,Pesticides,Ferric oxide,Silica gel}, url = {https://ejss.journals.ekb.eg/article_1562.html}, eprint = {https://ejss.journals.ekb.eg/article_1562_92c3b843b200035568d77590670008e5.pdf} } @article { author = {}, title = {Phosphate Solubilization and Changes of Certain Attributes in Soils as Affected by Bio-organic Fertilizers}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {463-481}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1566}, abstract = {            T HE PRESENT work was planned to study the influence of bio- organic additives, i.e. compost “CM” and farmyard manure “FYM”, as organic fertilizers, Bacillus megaterium “Bm” and Bacillus polymyxa “Bp”, as biofertilizers, on phosphate solubilization and certain attributes in sandy and alluvial clayey soils, periodically along 120 day incubation, in pot experiments, under greenhouse conditions.   Results showed that, all added amendments increased phosphate solubilization in both soils with time of incubation.  Incorporation of CM or FYM plus each of the biofertilizers greatly augmented phosphate solubilization, as compared with the single additive of each of the bio-organics. The increases resulted by using CM or FYM each with Bm, reached 105 & 62% and 88 & 51% above the control treatment in the sandy and clay soils, respectively. Treatments included the Bp, either alone or collaborated, despite their positive action, they gave lower values than those of the Bm.   Addition of CM or FYM slightly decreased the pH values of both soils, at the first period and somewhat had recovered towards the end of experimental duration. However, all amendments revealed inconsistence among the applied treatments on soil reaction “pH value”, generally within the succeeding intervals of incubation time. Nevertheless, the organic fertilizers generally excelled the bio-fertilizers, as well as combinations of the bio-organic treatments were thus more efficient in such concern (modifying the soil pH). Introduction of CM or FYM, each with Bm increased the concentration of the total soluble salts “TSS” by 48 & 59% and 65 & 80% above the control, in the sandy and clayey soils, respectively. Combination between the CM or FYM with the Bm resulted in lower increases, i.e. 40 & 52% and 55 & 66%, evolution rate of CO2augmented progressive with incubation time, when the clay soil excelled the sandy one, as the extents were 114 & 92% and 76 & 65% for CM+Bm, CM+BP, FYM+Bm and FYM+BP, respectively. Generally, the single addition of each of the bio-organic fertilizer was lower effective than the combined treatments.  }, keywords = {compost,farmyard manure,Bacillus megaterium,Bacillus polymyxa,Total soluble salts,CO2 evolution}, url = {https://ejss.journals.ekb.eg/article_1566.html}, eprint = {https://ejss.journals.ekb.eg/article_1566_e4c9cd1d7b52a4226d3cfd5df959c659.pdf} } @article { author = {}, title = {Assessment of Drainage Water Quality in Siwa Oasis and Its Suitability for Reuse in Agricultural Irrigation}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {501-515}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1568}, abstract = {           ONE of the most challenges to increase water resources use ……...efficiency and sustainability in arid and semiarid regions is the reuse of drainage water. The objective of this study was to assess the quality of drainage water in Siwa oasis and to address the suitability of its reuse to serve the sustainable management of water resources in the oasis. Georeferenced drainage water samples were collected in triplicates from 182 drains distributed around the oasis having different categories indicated by their depths ranging from 0.5 to 2.65 m. Measurements of pH, EC and analyses for soluble Na+, Ca2+, Mg2+ and Cl- ions and NO3-N were conducted then SAR and RSC were calculated. Volumes of drainage water were calculated using measured wetted length, width and depth of the sampled drains segments. Descriptive statistics, frequency distribution and Piper tri-linear analyses were performed on the obtained data. The calculated volume weighted averages of pHavg, ECavg, SARavg, RSCavg, and NO3-Navg were 8.85 dS/m, 7.46, 21.19, 1.72 and 13.51 mg/l, respectively. These averages were found to be generally higher than their calculated mathematical mean values. This represents C3S4 class of salinity and sodicity hazards and nitrate has not any impact on the environment. Application of the Piper tri-linear diagram for the hydrochemical facies indicated that drainage water is Na-Cl-SO4 type. For such an isolated oasis, regulation of groundwater pumping, lining irrigation canals and improvement of drainage networks, application of modern irrigation systems, the adoption of a suitable IFDM system and increasing the public awareness of the water crisis were suggested by the author.}, keywords = {Drainage water,water quality,Salinity/sodicity hazards,Hydrochemical facies}, url = {https://ejss.journals.ekb.eg/article_1568.html}, eprint = {https://ejss.journals.ekb.eg/article_1568_367fb1387d7f92f6662f555a86169290.pdf} } @article { author = {}, title = {Effect of Fresh and Saline Water Intrusion in Bitter Lakes Region on Agricultural Soil Degradation}, journal = {Egyptian Journal of Soil Science}, volume = {55}, number = {4}, pages = {483-499}, year = {2015}, publisher = {The National Information and Documentation Centre (NIDOC) affiliated to Academy of Scientific Research and Technology(ASRT)}, issn = {0302-6701}, eissn = {2357-0369}, doi = {10.21608/ejss.2015.1571}, abstract = { TO STUDY the effect of fresh and saline water intrusion on the Bitter lakes region, five transacts have been taken along the southern part of the Bitter Lakes in Ismailia Governorate. Their locations were Deferswar, Abu Sultan, El-Saidia, Fayed and Fanara. These transect have been taken from the shoreline of the Bitter Lakes up to the Suez fresh water canal. Soil profiles were dug at each transect to the water table level and soil samples were collected from different layers of different soil profiles. The data showed that soluble salts of the surface layer (0-60cm) decrease sharply from the shoreline of Bitter Lakes towards the fresh water canal. Total cations such as Na, Ca, Mg, K, Fe and Mn were evaluated at each layer of profiles, and their distribution with the surface layers of the water tables. The data showed that the moisture percent of all soil profiles increased gradually in different layers up to water table level. With regard to the probability of impact of sea level rise on the coastal stability of the Bitter lakes, it was found that the area extended between zero and one meter level contributes about 8.0% of the study area. It is extended along the western side of the Bitter lakes and eastern Malaria drainage. The area extended between 1.0-2.0m levels contributes about 11.0 % of the study area and protected from the saline water intrusion by the main Malaria drainage. The area extended between 2.0-3.0m levels contributes about 19% of the studied area. It is located mainly in sarabium, Deferswar and Fayed regions. The area above 3m height represents the rest of the case study area which contributes more than 60%. It is mostly elongated adjacent to the Suez Canal fresh water.}, keywords = {}, url = {https://ejss.journals.ekb.eg/article_1571.html}, eprint = {https://ejss.journals.ekb.eg/article_1571_9fa1546065a16b649acbbfa1fbb9c6da.pdf} }