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Ismail M.,Soils Water and Environment Research Institute | Yacoub R.K.,Soils Water and Environment Research Institute
Egyptian Journal of Remote Sensing and Space Science | Year: 2012

Due to the advances in the fields of remote sensing and GIS, a new paradigm, called digital soil mapping, is produced, where the emphasis is focused on soil attributes, assuming that these are continuously varying in space. Quantitative models have been developed within are used to describe, classify and study the spatial distribution patterns of soil as it occurs in the field. In this paper the dynamic SWERI Data Collector system (SDC) was used to determine the location of the soil profiles in the field work using HP Global Position System (GPS). The DEM was created using the geostatistical analysis. The geomorphic mapping units were created based on the result of digital elevation model using the histogram of the DEM values map. The physiographic mapping units are created by combining the most surveyed geomorphic mapping units with the geologic map. The variables of soil properties can be presented in values or classes, therefore two types of thematic maps could be identified. The first one used the values and the geostatistical analysis to create the soil variability value maps. The second type is descriptive variables such as soil classes and soil texture. The nearest point operation is a point interpolation which requires a point map as input and returns a raster map as output. The integrated methodology of this study could be considered as a ready module for applying at different locations and represents a significant participatory management tool for soil survey in Egypt. © 2012 National Authority for Remote Sensing and Space Sciences.


ElAzab K.M.,Soils Water and Environment Research Institute | Amer A.K.,Soils Water and Environment Research Institute | Hamad M.M.,Soils Water and Environment Research Institute | Abou-Elela E.G.,Soils Water and Environment Research Institute
International Journal of ChemTech Research | Year: 2015

In calcareous soils, phosphorus (P) retention and immobilization take place due to precipitation and adsorption. Also, addition of organic manure could improve the soil physical and chemical conditions besides it might increase the efficiency of added P fertilizer and provide additional source of nutrients. Information on the availability of P following inorganic fertilizer and compost addition to calcareous soil may help in better management of P fertilization. The objective of this studied was to study the combination effect of organic fertilizers addition (compost) and different forms of inorganic phosphorus fertilizers on the improvement of phosphorus use efficiency by maximizing its availability in calcareous soil and accumulation in biological yield of wheat(cv Giza168). The treatments includedthree inorganic-P forms (i.e. calcium super phosphate15 % P2O5 (P1), triple super phosphate 42% P2O5 (P2) and phosphoric acid72.4% P2O5 (P3) and control (without P) which combined with three rates of compost (0, 10 and 20 m3.fed.-1).The change in the amount of available P in soil was measured during wheat growth at three periods (i.e. tillering, spike development and maturity stages) in a field experiment on a calcareous soil. The amount of availableP in soil was determined by Olsen and analyzed statistically.On the other hand, the wheat plant parameters (i.e. biological yield, grains quality and plant nutritional status) were measured and analyzed. Results indicated that mean values of available P in soil were significantly increased with increasing the rates of compost combined with inorganic P particularly at 10 m3.Fed.-1 with either triple super phosphate (P2)or phosphoric acid (P3),while the obtained increases of available P content with increasing the rats of compost addition up to 20 m3.fed-1 were low compared to the rate 10 m3.Fed.-1. These decreasing may be attributed to the stimulatory effects of higher rate from compost in presence of these two forms (P2, P3)to enhance the precipitation and adsorption conditions or formation of less soluble complexes with Ca2+cations, then showed significantly decreasing along with age of plant. Also, this increase reflected significantly increasing in most studied parameters of plants. Finally, the data obtained for either percentage increase yield or phosphorous forms use efficiency (PFUE) appearedparallel trends. So,the highest percentage increases were at used the rate (10 m3.Fed.-1) combined with inorganic P2and P3,and then significantly decreased with increasing the rats of compost addition up to 20 m3.Fed.-1, this decreasing were highest at used P3compared P2.It is difficult to understand the difference between the role effect of P2 andP3 with compost.For these reason,it needs number of specific experimental for explain these process. © 2015, Sphinx Knowledge House. All rights reserved.


Kasim W.A.,Tanta University | Osman M.E.,Tanta University | Omar M.N.,Soils Water and Environment Research Institute | Abd El-Daim I.A.,Soils Water and Environment Research Institute | And 3 more authors.
Journal of Plant Growth Regulation | Year: 2013

Abiotic stress conditions are the main limiting factors for crop cultivation around the world. In the present study we aimed to improve wheat growth under drought stress conditions through priming with beneficial bacteria considered as plant-growth promoting bacteria (PGPB). Two bacterial strains, Bacillus amyloliquefaciens 5113 and Azospirillum brasilense NO40, were used to prime the wheat cv. Sids1. To generate drought stress for 12-day-old seedlings, water was withheld for 4, 5, or 7 days while growth and survival were recorded. Furthermore, several stress markers were examined by molecular and biochemical assays to study the role of priming on different stress tolerance mechanisms. Priming significantly alleviated the deleterious effect of drought stress on wheat. Drought resulted in the upregulation of some stress-related genes (APX1, SAMS1, and HSP17. 8) in the leaves and increased activity of enzymes involved in the plant ascorbate-glutathione redox cycle. Bacteria-treated plants showed attenuated transcript levels suggesting improved homeostatic mechanisms due to priming. The present study reports on the ability of certain PGPB to attenuate several stress consequences in plants which strongly supports the potential of such an approach to control drought stress in wheat. © 2012 Springer Science+Business Media, LLC.


Osman M.E.H.,Tanta University | Kasim W.A.,Tanta University | Omar M.N.,Soils Water and Environment Research Institute | Abd El-Daim I.A.,Soils Water and Environment Research Institute | And 3 more authors.
International Journal of Plant Biology | Year: 2013

The potential to enhance growth of cold stressed wheat by seed treatment (priming) with the beneficial bacteria Bacillus amyloliquefaciens 5113 and Azospirillum brasilense NO40 were tested. Results showed an improved ability of bacteria-treated seedlings to survive at -5°C up to 12 h. Cold stress increased transcript levels of three stress marker genes and increased activity for the ascorbate-glutathione redox enzymes. However, primed and stressed seedlings generally showed smaller effects on the stress markers correlating with better growth and improved stress tolerance. Bacterial priming to improve crop plant performance at low temperature seems a useful strategy to explore further. © M.E.H. Osman et al., 2013.

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