Mansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901ASSESSMENT OF LAND DEGRADATION IN WADI EL NATRUN AREA, WESTERN DESERT, EGYPT8118265214710.21608/jssae.2013.52147ENP. M. AqrawiSoils Science Dept., Faculty of Agriculture, Cairo Uni., Giza, Egypt.A. A. Abdel HadySoils Science Dept., Faculty of Agriculture, Cairo Uni., Giza, Egypt.W.A. Abde LKawySoils Science Dept., Faculty of Agriculture, Cairo Uni., Giza, Egypt.A. El-NahryNational Authority for Remote Sensing and Space SciencesJournal Article20130823Most forms of land degradation are human resource (mismanagement and misuse); some physical and chemical environmental factors are still considered. Quantitative assessment of land degradation and monitoring the changes in land qualities in Wadi El-Natrun are the main objective of this study. Physiographic map of the area was produced by using ETM+, ENVI 5.0 and ArcGIS10. Physiographic map used to determine soil profiles location and soil samples. From the physical and chemical analysis the results compared with the data extracted from Mohamed, (2011). Land degradation rate, relative extent, degree, and severity level in the study area were assessed. The results indicate that the dominant active land degradation features are; water logging, salinity, alkalinity and compaction. Based on the FAO/UNEP, (1979) program of degradation (rate, relative extent, degree, and severity) and the application on that data of water logged, salinity, alkalinity and compaction compared with Mohamed, (2011). The results indicate that the following: - there is no effect of compaction so there is no compaction degradation . Waterlogged degradation as water table depth changed from 2011 to 2013 as following ( 50-100 cm ) the degraded area increased from (234.32 to 341.28 km<sup>2</sup> ) , <br /> ( 100-150 cm ) the soil improved and the degraded area decreased (from 356.31 to 218.42 km<sup>2</sup>) and ( > 150 cm) were improved. Salinity degradation as electrical conductivity(EC dS/m) data changed from ( 2011 to 2013 ) that the ( 8-16 dS/m ) the degraded area increased from ( 0.0 to 16.83 km<sup>2</sup>), ( 4-8 dS/m ) the soil improved and the degraded area decreased (from 190.86 to 110.43 km<sup>2</sup>) and ( <4 dS/m ) the soil improved and the area increased (from 399.76 to 451.87 ). Alkalinity degradation data changed from ( 2011 to 2013 ) that the ( >15 %) no change , ( 10-15% ) the soil improved and the degraded area decreased (from 437.98 to 190.82 km<sup>2</sup>) and ( <10 % ) the soil improved and the area increased (152.64 to 388.32 km<sup>2</sup> )
https://jssae.journals.ekb.eg/article_52147_a2aef4dc0c13b8d481e37f2141d4ecfe.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901BENEFICIAL EFFECT OF POTASSIUM FERTILIZATION AND YEAST STRAINS ON MAIZE PLANTS GROWN ON SALT AFFECTED SOIL.8278425247910.21608/jssae.2013.52479ENR. A. El-DissokySoils, Water and Environment Res. Inst., Agric. Res. Center. Giza, Egypt.Ebtsam M. MorsySoils, Water and Environment Res. Inst., Agric. Res. Center. Giza, Egypt.M. A. El-ShazlySoils, Water and Environment Res. Inst., Agric. Res. Center. Giza, Egypt.Journal Article20130826The use of yeast as a bio-fertilizer in agriculture has taken a considerable attention because of their bioactivity and safety for human and the environment. The current study aimed to evaluate the effect of potassium fertilization and two yeast strains on maize productivity grown on salt affected soil in Dakahlia Governorate to find out their beneficial effect as biofertilizer. Two years field experiment were conducted to investigate the effect of potassium application levels (0, 30. 40 and 50 kg K/fed.) combined with or without <em>Saccharomyces cerevisiae</em> or <em>Rhodotorula mucilaginosa</em> on the maize yields, potassium use efficiency, NPK uptake and soil fertility after harvest. In addition, total microbial and yeast counts as well as dehydrogenase activity after 50 and 80 days from planting were studied. The results showed that application of potassium with yeast significantly increased maize grain and stalks yield, 1000-grain weight and weight of ear/plant. The application of potassium enhanced K % in maize stalk and grain and decreased Na %, as well as markedly raised the maize salt tolerance via increasing the K/Na ratio, especially with the highest rate of potassium fertilization. Potassium use efficiency and potassium uptake were markedly increased with the application of potassium combined with yeast. The highest K- utilization rate 84.93 % was recorded with the treatment consists of 30 kg K/fed + <em>Rhodotorula mucilaginosa.</em> Potassium fertilization positively affects the nitrogen and phosphorus uptake in both studied seasons. Soil salinity and fertility were slightly increased with the application of potassium fertilizers. The highest values of total microbial and yeast counts as well as the dehydrogenase activity were observed with the low levels of K fertilizer associated with <em>Rhodotorula mucilaginosa. </em>So it could be recommended to apply the low levels of potassium together with the yeast strains as a biofertilizer to overcome the salt stress of maize plants.https://jssae.journals.ekb.eg/article_52479_a183978faf5dfcef030da3aa66635ed5.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901EFFECT OF IRRIGATION BY WASTEWATER ON SOIL PROPERTIES, PLANT GROWTH AND DRAINAGE WATER QUALITY8438625214310.21608/jssae.2013.52143ENI. H. ElsokkaryDept. of Soil and Water Sci., Fac. of Agric., El-Shatby, Alexandria Univ., Alexandria, Egypt,A. F. AbukilaNational Water Res. Center, Drainage Res. Institute, EgyptJournal Article20130829This study were carried out to evaluate the effect of irrigation by treated wastewater (TWW) on some chemical properties of cultivated lacustrine and calcareous soils, the growth and macronutrients contents of soybean (<em>Glycine max</em> L.), corn (<em>Zea mays</em> L.) faba bean (<em>Vicia faba</em>) and wheat (<em>Triticum aestivum</em> L.) plants and the chemical composition of drainage water. Pot experiments were carried out in the greenhouse at the Agriculture Research Farm, Faculty of Agriculture, Alexandria University. Fifty kgs soil were placed in a plastic pot and the seeds of each plant species were sown and irrigated by freshwater (FW) for two weeks then by the tested water treatments: FW, TWW or 1:1 FW/TWW. Soil and plant samples were collected two weeks before plant harvest for analysis and samples of drainage water were collected for the determination of pH, TDS, NO<sub>3</sub><sup>-</sup> and total P.
The results showed significant increases in the ECe, OM and available N, P and K in soils as a result of TWW and 1:1 FW/TWW irrigation. Also, the concentrations of N, P and K in leaves of plants irrigated by TWW and 1:1 FW/TWW were significantly higher than in those irrigated by FW. In addition, the dry weights of plants were significantly higher as a result of irrigation by TWW and 1:1 FW/TWW than of those irrigated by FW.
The drainage waters of the cultivated soils irrigated by TWW and 1:1 FW/TWW had higher concentrations of TDS, NO<sub>3</sub><sup>-</sup> and total P than of those irrigated by FW. The concentrations of TDS in drainage waters from cultivated calcareous soils were almost higher than of those from cultivated lacustrine soils. The results obtained proved that the beneficial effects of irrigation by treated wastewater were relatively more found with calcareous soil than with lacustrine soil.https://jssae.journals.ekb.eg/article_52143_1d3ae55187f6882887e8e60b728fcb8b.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901EFFECT OF COMPOST AND COMPOST TEA APPLICATION ON FABA BEAN CROP AND SOME SOIL BIOLOGICAL AND CHEMICAL PROPERTIES8638745247710.21608/jssae.2013.52477ENE. S. A. El-GizawySoils, Waters and Environment Res. Institute, ARC, Egypt.A. A. I. AtwaSoils, Waters and Environment Res. Institute, ARC, Egypt.N. I. TalhaSoils, Waters and Environment Res. Institute, ARC, Egypt.R. A. I. MostafaField crop Res. Institute, ARC, EgyptJournal Article20130902The objective of this investigation was to study the effect of addition of organic matter i.e, composted rice straw, compost tea and their interaction on the yield and seed nutrients content of faba bean (<em>vicia faba </em>L.) cv. Sakha 1 and some soil biological and chemical properties. A field experiment was conducted in the Experimental Farm of Sakha Agric. Res. Station in two successive winter seasons of 2010/2011 and 2011/2012. Results showed that soil organic matter content was increased, while values of soil salinity (ECe) were reduced and there was a slight reduction in soil pH with compost addition at rates 2 and/or 4 tons/fed.
Data recorded the highest significant increases in nodule numbers and its dry weight as compared to control. Also, these treatments recorded significant increases the biological activity of soil in terms of increasing the soil total bacteria, as well as dehydrogenase activity and nitrogenase activity that increase the soil fertility, improved plant quality, as well as environmentally safe and eco-friendly, that positively turn on faba bean yield production.
The interaction between compost and compost tea gave better results in increasing the seed yield especially for application of 4 tons /fed with compost tea spraying at 50 days after sowing increased the seed yield by 51%, 53.1% relative to control in the two seasons (2010/2011 and 2011/2012), respectively. Nutrients content (N, P and K) of faba bean seeds was significantly increased in all treatments compared with the control. Also, the results showed that application of rice straw compost was effective for increasing available N, P and K in soil as compared to the control. Based on the results of the current study, the combinations between rice straw compost and compost tea are considered as an integrating nutrient management to improve the soil biological and chemical properties and yield of faba bean crop.https://jssae.journals.ekb.eg/article_52477_6a31a2aaf33ee8b7af03720347421e2f.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901EFFECTS OF PARENT MATERIAL WEATHERING ON MINERALOGICAL AND CHEMICAL PROPERTIES OF SOME SOILS IN THE BAHARIYA OASIS, WESTERN DESERT, EGYPT8758915248110.21608/jssae.2013.52481ENM. A. M. HusseinSoil & Water Dept. Fac. Of Agric., Al-Azhar University, EgyptJournal Article20130905The clay mineralogy and trace elements analysis of 31 selected soil profiles was recorded using X-ray diffraction analysis and X-ray fluorescence analysis. Results indicate that smectite is the predomoniant clay mineral followed by kaolinite in the soil derived from Bahariya, El Hefhuf and Khoman Formation. Kaolinite is the predominat mineral in the soils derived from El Heiz, Qazzun and Radwan formation.
The origin of these clay minerals may be related almost entirely to parent rocks without significant transformation within the soil profiles studied.
The distribution of the trace elements in the studied soil profiles indicate that, zirconium (Zr) is the dominant element in all profiles studied and Formation. Barium (Ba) is the second dominant element followed by Zin (Zn) and chromium. (Cr).
Based on the soil properties and the American soil Taxonomy (2006) Baharia Oasis soils were classified at great soil group level into Torripsaments, Torriorthents, Haplosalids and Haplocalcidshttps://jssae.journals.ekb.eg/article_52481_08ff6d8702edfe6babd64c2e642efbe1.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901EFFECT OF SOWING DATE AND NITROGEN, POTASSIUM FERTILIZATION ON FABA BEAN PRODUCTIVITY IN NEWLY RECLAIMED SALINE SOIL OF NORTH SINAI8939045249210.21608/jssae.2013.52492ENKh. A. ShabanSoils & Water and Environ. Res. Inst., Agric. Res. Center, Giza, Egypt.A. A. KhalilSoils & Water and Environ. Res. Inst., Agric. Res. Center, Giza, Egypt.Amira A. MohamedSoils & Water and Environ. Res. Inst., Agric. Res. Center, Giza, Egypt.Journal Article20130908Faba bean (Cv. Nubaria 1) was grown during the two winter seasons 2011/2012 and 2012/2013 in saline soil at North Sinai Governorate, Egypt, to study of the effect of potassium sulfate (48 % K<sub>2</sub>O) rates ( 50 – 75 and 100 kg K<sub>2</sub>O fed<sup>-1</sup>) , urea (46 % N) rates (10 – 20 -40 kg N fed<sup>-1</sup>) alone or in combination with bio-fertilizers (<em>Bacillus </em><em>circulans</em>potassium solubilizing bacteria) + <em> Rhizobium radiobacter</em> nitrogen fixing bacteria strain inoculation, Salt Tolerant PGPR and sowing dates (25 October, 25 November and 25 December ) on faba bean productivity and the nutrients content in faba bean grains under saline soil conditions was conducted:
Results showed that the greatest seeds yield was obtained with the rate of 40 kg N +100 kg K<sub>2</sub>O fed<sup>-1</sup> combined with bio-fertilizer and sown on date in 15 November in both seasons. Also, the rates of N, K and sowing date significantly increased P, K, Fe Mn and Zn content in faba bean seed in both seasons, while grain N content showed no significant differences in the first season. Soil contents of N, K, Mn and Zn were significantly affected by N, K and sowing date while the available P and Fe showed not significant differences in the first season. Sowing date (25 November) recorded the highest values of seeds protein content.
It could be recommended that use of 20 kg N + 75 kg K<sub>2</sub>O fed<sup>-1</sup> combined with bio-fertilizers and sowing date of 25 November gave the greatest seed yield and improved nutrients content in grains under saline soil conditionshttps://jssae.journals.ekb.eg/article_52492_42adffd3c0fe3240001b79a5127a9670.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901SOIL MANAGEMENT AND IMPROVEMENT OF SALT AFFECTED SOILS9079195215110.21608/jssae.2013.52151ENF. A. FaragSoils, Water and Environment Res. Inst., Agric. Res. Center, Giza, EgyptM. A. E. El ShazelySoils, Water and Environment Res. Inst., Agric. Res. Center, Giza, EgyptA. H. Abd ElrahmanSoils, Water and Environment Res. Inst., Agric. Res. Center, Giza, EgyptM. S. AwaadSoils, Water and Environment Res. Inst., Agric. Res. Center, Giza, EgyptJournal Article20130910A field experiment was conducted in clay saline –sodic soils, located in the north east of Egypt, Sahl El-Hossinia Research station, Agriculture Research Center, El-Sharkia Governorate, Egypt, during summer season 2011 and winter season2011/ 2012 to evaluate the effect of some soil management practices i.e., mole drain filled back with sand at two diameter 7.5 cm and 10 cm under three distances 4, 6 and 8 m individually or combined with some soil amendments application;) gypsum, sand and aluminum sulfate( on improving some physical and chemical soil properties. Also, use of the continuous leaching processes for salt removal after each rotation of leachate 25, 75, 125 and 275 days. The soil samples were taken to determine EC, pH and ESP as well as at the end of experiment. Also, the hydraulic conductivity, bulk density and total porosity were determined. The results indicated that the construction of mole drain filled back with sand individually after four rotations of leachate processes led to significant decrease in the values of EC, pH and ESP compared with the initial values. These decreases were more effective with application of soil amendments i.e. (gypsum, sand and aluminum sulfate) combined with the mole drain compared with the empty mole drain . It was observed that at the end of the experiment after four rotations leachate processes, the mole drain at different spacing which filled back with sand combined with soil amendments application significantly decrease the values of bulk density and increase the values of hydraulic conductivity and total porosity compared with the initial values. The superiority in improving physical properties (hydraulic conductivity, bulk density and porosity of the studied soil was recorded with mole drain filled back with sand combined with the soil amendment as aluminum sulfate or gypsum compared with sand after fourth rotations of leachate.https://jssae.journals.ekb.eg/article_52151_caeec7ac32f51bec66d766fa3af840e5.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901SOIL CLASSIFICATION OF BAHARIYA OASIS USING REMOTE SENSING AND GIS TECHNIQUES9219475248810.21608/jssae.2013.52488ENA. A. ElnaggarSoils Dept., Fac. of Agric., Mansoura Univ., Egypt.Kh. H. El-HamdiSoils Dept., Fac. of Agric., Mansoura Univ., Egypt.A. B. A. BelalNational Authority for Remote Sensing and Spaces Sciences (NARSS), Cairo, Egypt.M. M. El-KafrawySoils Dept., Fac. of Agric., Mansoura Univ., Egypt.Journal Article20130912 Bahariya Oasis is one of the most geologically important areas in the WesternDesert. It is also a promising location for agriculture expansion projects due to the plenty and good quality of ground water for agricultural activities. The objective of this work was to develop a soil classification map of this area using remote sensing and GIS techniques. Spot image, acquired in 2011 and digital elevation model (DEM) were used to develop physiographic units. Three main physiographic units were identified in the oasis, which are plains, depression floor with low, moderately high and high lands and pediment. Thirty one soil profiles were dug throughout the oasis to represent soil physiographic units. These profiles were described, and sampled. Soil samples were analyzed for the physical and chemical characteristics. Soils in the studied area were classified under 11 soil map units (SMUs), which are: 1. <em>Sandy, siliceous, calcareous,</em> <em>thermic, Lithic Calcigypsids</em>, 2. <em>Sandy, siliceous, thermic, Lithic Haplogypsids</em>, 3. <em>Sandy, siliceous, thermic, Typic Haplogypsids, 4. Sandy, siliceous, thermic, Typic Aquisalids</em>, 5. <em>Sandy, siliceous, thermic, Typic Haplosalids</em>, 6. <em>Loamy, mixed, active, thermic, Typic Gypsiargids</em>, 7. <em>Sandy, siliceous, thermic, Typic Quartzipsamments,</em> 8. <em>Sandy, siliceous, thermic, Lithic Torripsamments</em>, 9. <em>Sandy, siliceous, thermic, Typic Torripsamments</em>, 10. <em>Loamy, mixed, super active, thermic, Typic Torrifluvents,</em> and 11. <em>Sandy</em><em> skeletal, siliceous, thermic, Typic Torriorthents. </em>Calcium, gypsum, and salt accumulations were found in most of the studied soils. Few accumulations of silicate clays were also observed in certain areas of the depression.https://jssae.journals.ekb.eg/article_52488_23998da298831430edfa573dbbf5166a.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901EFFECT OF SOME FACTORS ON PHOSPHOROUS CONTENT AND UPTAKE OF WHEAT STRAW GROWN ON A CALCAREOUS SOIL9499565248010.21608/jssae.2013.52480ENM. M. MohamedSoils and Water Dept.,Fac.of Agric.,Al-Azhar University,CairoM. O. El - Mohtasem BellaSoils and Water Dept.,Fac.of Agric.,Al-Azhar University,CairoR. A. Abou El-KHairSoils and Water Dept.,Fac.of Agric.,Al-Azhar University,CairoM. H. ShetaSoils and Water Dept.,Fac.of Agric.,Al-Azhar University,CairoJournal Article20130915The current work was carried out to study the effect of irrigation water salinity, farmyard manure levels and moisture content on phosphorous content and uptake of wheat plants grown on a calcareous soil<strong>. </strong>A pot experiment was carried out in the green house of Soils and Water Department, Faculty of Agriculture, Al-Azhar University) Nasr city, Cairo, Egypt), during the winter season of 2009.Wheat plants (<em>Triticum aestivum</em>, L.) Sakha 93variety, were used as an indicator plant to experiment treatments.Twenty grains were sown in each pot and the treatments were three replicates including control. After 15 days, the pots were thinned to 10 seed lings. Completely randomized block design was used.
Four salinity levels of irrigation water were prepared (control, 0.44, 1.56, 3.12 and 6.25 dSm<sup>-1</sup>) under different moisture contents (100%, 75% and 60%) of field capacity determined by weight and four organic matter levels (0%, 1%, 2% and 4%) farmyard manure (FYM). Results showed that phosphorus content and uptake in straw significantly decreased with increasing salinity levels while it was increased with increasing moisture levels .Also, application of farmyard manure at rates up to 2% induced significantly increases in phosphorus content and uptake in wheat straw. https://jssae.journals.ekb.eg/article_52480_896cb62eacace8d5a9d4749680e4552c.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901IMPROVEMENT OF CLAYEY SOIL DRAINAGE IN DAKAHLIA GOVERNORATE9579745249010.21608/jssae.2013.52490ENE. B. ElbannaAgric. Eng. Dept., Fac. Agric., Mansoura Univ.M. M. IbrahimAgric. Eng. Dept., Fac. Agric., Mansoura Univ.A. E. Abou EL-MagdAgric. Eng. Dept., Fac. Agric., Mansoura Univ.H. E. DewedarAgric. Eng. Dept., Fac. Agric., Mansoura Univ.Journal Article20130917Sub-soiling system was conducted in order to alleviate the disadvantage which developed by soil compaction. A comparison made between field treatments which tilled by chisel plough at 20 cm depth and the technique of sub-soiler plough with differences in the sub-soiling depths (25, 50, and 75 cm) and the lateral spaces between sub-soiling ruts (200, 400, and 800 cm). Each techniques of the sub-soiling depth were replicated with all of the different distance of lateral spaces between sub-soiling ruts. The aim of the comparison was to indentify the most effective sub-soiling technique which produce more enhancement of soil physical properties, achieve the best distribution of soil moisture content and achieve the highest rate of soil water flux.
Results indicated that, the plot of soil which was tilled at 75 cm with a lateral space of 200 cm, recorded the lowest moisture content values and exhibited the highest values of soil penetration resistance. It exhibited more enhancement of soil physical properties as the action of the excess loosening occurred from the deep tilling with the narrower lateral space lead to increases soil porosity, improve permeability, decrease soil strength to low values in comparison with their values before sub-soiling. The soil plot which tilled at 50 cm with a lateral space of 200 cm were also achieved more enhancements. Those plots were also recorded high correlation coefficient consideration to the three irrigations. It was found 95.16 and 94.97 % at the first irrigation, 95.54 and 95.47 % at the second irrigation and 95.45 and 95.28% at the third irrigation for the plots of 75 and 50 cm, sub-soiler depth and 200 cm, lateral space respectively. Values of soil bulk density which obtained after the three irrigations for all the sub-soiling plots decreased from the values obtained before sub-soiling. And the lowest values were found at the top surface layer, this was due to tilling with chisel plough at 20 cm depth where, a more pulverization occurred in the top layer. The higher rate of soil water flux was exhibited from the plots which were tilled at 75 and 50 cm, with a lateral space of 200 cm, followed by the plots which were tilled at 75 and 50 cm, with a lateral space of 400 cm. and high correlation coefficient of 98.62 % was obtained from statistical analysis made using the drainage equations. From the obtained results, it can be concluded that, the lateral space between sub-soiling ruts decreases with an increase in the tillage depth, the soil achieve more enhancement of soil physical properties and exhibit higher rate of soil water flux.https://jssae.journals.ekb.eg/article_52490_a3bde94a9086ae53b174c6e91540e556.pdfMansoura University, Faculty of AgricultureJournal of Soil Sciences and Agricultural Engineering2090-36854920130901ADSORPTION STUDIES ON THE REMOVAL OF HEXAVALENT CHROMIUM AND LEAD FROM CONTAMINATED WASTEWATER USING LEAVES OF WATER HYACINTH AS AN ADSORBENT9759875248910.21608/jssae.2013.52489ENT. M. Y. OmarRegional Center for Foods and Feeds, Agric. Res. Center, Ministry of Agric., Giza, Egypt.A. M. El-ShinnawyRegional Center for Foods and Feeds, Agric. Res. Center, Ministry of Agric., Giza, Egypt.Journal Article20130920Present of heavy metals in the aquatic system has become a serious problem. As a result, there has a great deal of attention give to new technologies for removal of heavy metal ions from contaminated waters. Biosorption is one such emerging technology which utilized naturally occurring waste materials to sequester heavy metals from industrial wastewater. The wastewater containing hexavalent chromium and lead was treated with biomass prepared from water hyacinth leaves. It was found that a time of 2 hrs was sufficient for sorption to attain equilibrium. The equilibrium sorption capacity after 2 hrs was 18 mg/L and 15 mg/L for lead and chromium, respectively. The optimum pH was 5 for lead and 2 for chromium. Temperature has strong influence on biosorption process. The removal of lead decreased with increase in temperature. On the other hand, chromium removal increased with increasing in temperature up to 40<sup>0</sup>C and then started decreasing. Ion exchange was the major removal mechanism along with physical sorption and precipitation. Equilibrium data were analyzed by Langmuir and Freundlich isotherm models and the biosorption data were well fitted to Freundlich isotherm model. It was concluded that adsorbent prepared from water hyacinth leaves can be utilized for the treatment of lead and chromium in wastewater. The water hyacinth leaves can be possible recycled by washes with 0.5 N NaOH solution then with tap water several times to get rid of metals. These results introduce applicable technique for removal heavy metal ions from contaminated waters resulted from industrial activities and <strong><br /></strong>https://jssae.journals.ekb.eg/article_52489_0c75e0f17e8921b115e901415f810ee1.pdf