Dr. Ahmed Taha - Academia.edu (original) (raw)

Papers by Dr. Ahmed Taha

Research paper thumbnail of Water management of maize-cowpea intercropping system under surface irrigation

Zenodo (CERN European Organization for Nuclear Research), Mar 16, 2022

Research paper thumbnail of Productivity of date palm as affected by irrigation in a sandy soil

Zenodo (CERN European Organization for Nuclear Research), Jun 15, 2022

Research paper thumbnail of Approaches to increase the resiliency of Egyptian agriculture to climate change: An Overview

Zenodo (CERN European Organization for Nuclear Research), Jun 13, 2022

Research paper thumbnail of Combating Adverse Consequences of Climate Change on Maize Crop

SpringerBriefs in Water Science and Technology, 2015

In this chapter we investigated the effect of cultivating maize on raised beds and irrigation wit... more In this chapter we investigated the effect of cultivating maize on raised beds and irrigation with drip system on increasing national maize production through increasing productivity, reducing the applied irrigation water and use it to irrigate more land with maize. Under climate change, maize vulnerability can be reduced by the above practices. We also calculated the contribution of each option in reducing maize production-consumption gap under current climate and under climate change in 2040. The effect of these practices on water and land productivity under preset time and under climate change in 2040 was also examined. The results revealed that production-consumption gap in maize are about 45 %. The results also indicate that cultivating maize on raised beds or using drip system for irrigation reduced production-consumption gap under current climate and in 2040, where the percentage of imported maize will reduce to 23 and 12 % under both systems, respectively, under current climate and will reduce yield losses under climate change. The results also indicate that water productivity was the lowest under surface irrigation and was the highest when drip system was used under both current and climate change.

Research paper thumbnail of Pearl millet forage productivity under sprinkler irrigation system in sandy soil

Research paper thumbnail of Maximizing Land and Water Productivity by Intercropping Sunflower with Peanut under Sprinkler Irrigation

Alexandria Science Exchange Journal, 2018

Effective intercropping pattern, use of highly efficient irrigation system and proper irrigation ... more Effective intercropping pattern, use of highly efficient irrigation system and proper irrigation scheduling are one of the current challenges in agriculture sector for saving water, maximizing crop production and economic benefits. Thus, a two-year field experiment was conducted at Ismailia Research Station (30o 35' N latitude, 30o 26' E longitude, 20.0m above MSL), Egypt during the two growing seasons of 2016 and 2017 to study the effect of three irrigation treatments (1.2, 1.0 and 0.8 ETo calculated by the BIS model) and five peanut/sunflower intercropping patterns ((P1 = 100% peanut + 25 % sunflower), (P2 = 100% peanut + 33% sunflower), (P3 = 100% peanut + 50% sunflower), (P4 = sole peanut), and (P5 = sole sunflower)) on yield and its components of both crops, applied irrigation water, consumptive use, land and water productivity and net income. The experimental layout was designed in strip plot with three replicates. The results indicated that light intensity percentage significantly decreased with the 1.2 ETo treatment. The highest values of growth and yield of pod, seed and oil of peanut and sunflower were detected with the application of 1.2 ETo. Intercropping sunflower with peanut significantly reduced the yield of both crops in both seasons. However, intercropping sunflower at low density (P1) recorded the maximum values for yield and yield components of peanut, compared to the P2 and P3 treatments. The highest values of applied water (451 and 439mm) and consumptive use (403 and 415mm) were obtained in the first and second growing seasons, respectively when P3 (100% P + 50% S) was irrigated with 1.2 of ETo. Intercropping sunflower with peanut increased water use efficiency (kg/mm or cereal unit/mm) compared with sole crop. The average of water equivalent ratio was highest (1.255) produced with P3 under 1.0 ETo treatment, as average of both growing seasons. The maximum value of land equivalent ratio (1.569) and net income (L.E. 22589/ha) were recorded with P3 intercropping pattern irrigated with 1.2 of ETo treatment, on average basis of both growing seasons. Sunflower was the dominant component for the all intercropping systems, while peanut was the dominated crop. Thus, we recommend the implementation of P3 intercropping system, namely 100% peanut + 50% sunflower irrigated with 1.2 of ETo to increase land productivity in sandy soil under sprinkler irrigation or with 1.0 of ETo to save on the applied irrigation water, with yield lose were low. Under severe drought conditions, we recommended application of 0.8 ETo.

Research paper thumbnail of Required Interval of Weather Data for Proper Irrigation Scheduling

Egyptian Journal of Agronomy, 2019

C LIMATE variability is very common in Egypt recently, therefore studying its effects on irrigati... more C LIMATE variability is very common in Egypt recently, therefore studying its effects on irrigation scheduling for crops is important. The objective of this study was to define a number of years of former weather data prerequisite to estimate evapotranspiration (ETo) to schedule irrigation in three sites in Egypt (El-Gharbia, Beni Swief and Sohag). Daily values of weather data were collected for 10 years (2008-2017). Monthly ETo values were calculated by The BISm model. Descriptive statistics (mean, range, R 2 , CV and SD) were done to determine the temporal and spatial variability between monthly values of weather elements, as well as ETo. Furthermore, assessment of ETo values trend (decreasing or increasing) was done. The results showed that there were increasing temporal and spatial trends in the 10-year weather data, as well as ETo values in the 3 sites. However, it was more pronounced from 2015 to 2017. Furthermore, the results indicated that the range, CV% and SD were lower in the 3-year interval (2015-2017), compared to 10-year interval for all sites. There were stronger relationships between weather elements and ETo values in the 3-year interval, compared to 10year interval, as represented by R 2 values. Thus, it can be concluded that the recent 3-year interval is the most suitable interval for ETo calculation for proper irrigation scheduling to improve water management on field level in Egypt.

Research paper thumbnail of Water Productivity of Wheat Crop as Affected by Different Sowing Dates and Deficit Irrigation Treatments

Journal of Soil Sciences and Agricultural Engineering, 2017

Climate change scenarios require reconsidering different agricultural practices including sowing ... more Climate change scenarios require reconsidering different agricultural practices including sowing dates and irrigation intervals. For this purpose, a field experiment was carried out at the Agricultural Research Farm of Sakha Agricultural Research Station, Kafr-Elsheikh Governorate during the successive winter seasons 2013/2014 and 2014/2015 to investigate the impact of deficit water irrigation and sowing dates on wheat crop productivity(Triticum aestivum L.). The experimental site located at latitude of 30˚: 37͞ N, longitude of 31 ˚-57͞ E, and altitude of +6 meters above the sea level. The experimental design was splitplot with three replicates. The main plot was assigned to sowing dates of 15 th November (S 1) , 30 th November (S 2) and 15 th December (S 3), while the sub plot was assigned to irrigation treatments i.e. I 1 (given four irrigations plus the sowing irrigation, I 2 (given three irrigations following the sowing irrigation) and I 3 (given two irrigations after the sowing irrigation). The highest mean values of water applied (Wa) and consumptive use (CU) were 613.6 and 485.6 mm under treatment S 1 I 1 , respectively. While the corresponding lowest mean values were 363.3 and 310.4 mm under treatment S 3 I 3. The highest contribution percentages of rainfall to water applied (Wa) were 46.6% and 38.4 % for treatments S 3 I 3 under third sowing date in the first season. While, in the second season were 43.4% and 35.7% for treatments S 2 I 3 under the two sowing date, respectively. The lowest contribution percentages were 27.3%, 31.7 % and 27.8% , 32.4% for treatment S 1 I 1 under first sowing date in two seasons. Moreover, the highest mean values of grain water productively (WP g), straw water productively (WP s) were recorded under S 1 and I 3 in the first season with values of 1.47, 1.48, 2.27 and 2.19 kg m-3 , respectively. While in the second season the highest values were recorded under S 2 and I 3 with values 1.7, 1.59, 2.31 and 2.41 kg m-3 , respectively. The highest mean values of productivity of water applied for grain and straw (PWag , PWas) were recorded under S 2 , I 3 , in two growing seasons with

Research paper thumbnail of Irrigation and fertigation scheduling under drip irrigation for maize crop in sandy soil

International Agrophysics, 2016

Field experiments was conducted to determine the best irrigation scheduling and the proper period... more Field experiments was conducted to determine the best irrigation scheduling and the proper period for injecting fertilizers through drip irrigation water in a sandy soil to optimize maize yield and water productivity. Four irrigation levels (0.6, 0.8, 1.0 and 1.2) of the crop evapotranspiration and two fertigation periods (applying the recommended fertilizer dose in 60 and 80% of the irrigation time) were applied in a split-plot design, in addition to a control treatment which represented conventional irrigation and fertilization of maize in the studied area. The results showed that increasing the irrigation water amount and the fertilizer application period increased vegetative growth and yield. The highest grain yield and the lowest one were obtained under the treatment at 1.2 and of 0.6 crop evapotranspiration, respectively. The treatment at 0.8 crop evapotranspiration with fertilizer application in 80% of the irrigation time gave the highest water productivity (1.631 kg m−3) and...

Research paper thumbnail of Water management for wheat grown in sandy soil under climate change conditions

Journal of soil science and plant nutrition, 2012

The effect of fertigation regimes on wheat grown in sandy soil was tested in two field experiment... more The effect of fertigation regimes on wheat grown in sandy soil was tested in two field experiments in Egypt. The aim of the study was to determine the vulnerability of wheat to extreme weather event under climate change scenarios. Eight fertigation treatments, in addition to farmer irrigation were tested. Two climate change scenarios obtained from Hadley climate change model were incorporated in CropSyst model to assess wheat yield responses to fertigation regimes under these scenarios. The results showed that the highest yield and the highest water use efficiency (WUE) was obtained under irrigation application using 1.2 and 0.8 of Etc, respectively, with fertigation application in 80% of application time in both growing seasons. The calibration of CropSyst model confirmed that the model is able to mimic the growth of wheat and predicted grain, biological yield, and WUE with high degree of accuracy. The highest yield reduction and the lowest WUE under the tested climate change scenarios were obtained from farmer irrigation. It can be concluded that irrigating wheat grown in sandy soil with an amount of either 1.0 or 0.8 of ETc with fertigation application in 80% of application time is recommended to enhance growth and yield, and to reduce wheat's damage caused by extreme climate change.

Research paper thumbnail of Egyptian in Vitro and in Vivo Baculovirus Complex Models for Recombination Studies

Ahstrnct-Three major lepidopteran pests in Egypt, namely Phthoriiriaea operculella, Spodoptera li... more Ahstrnct-Three major lepidopteran pests in Egypt, namely Phthoriiriaea operculella, Spodoptera littoralis and Sesairiia cretica, are infected by a specific granulovirus (GV) and also nucleopolyhedroviruses (NPVs) with different degrees in their respective pathogenicity and persistency. This local situation and the existence of several isolates of these different viruses offer exceptional potentialities for the development of genetic studies, because of the availability of susceptible cell lines established from embryonic cells of the three species. Using experimental recombinations between GVs and also between GVs and NPVs will permit us to study the phenomenons which regulate the viral specificity, to study at the genetic level the differential biological properties of the baculoviruses, and finally to increase their potentialities.

Research paper thumbnail of Agro-environmental applications of humic substances: A critical review

Egyptian Journal of Soil Science, 2020

Research paper thumbnail of Maximizing Land and Water Productivity of Sudan-Grass Under Sprinkler Irrigation in Sandy Soil

A field experiment was conducted at Ismailia Research Station (30 35' N latitude, 30 26' ... more A field experiment was conducted at Ismailia Research Station (30 35' N latitude, 30 26' E longitude, 20.0m above mean sea level), Egypt during the 2016 and 2017 growing seasons to study the effect of three irrigation treatments (125, 100 and 75%ETo) on forage yield and its attributes of Sudan-grass crop. The effects of irrigation levels on the amounts of applied irrigation water, water consumptive use, water productivity on forage yield and its components, as well as its yield quality were studied. Results indicated that distribution uniformity values were 76 and 78% in 1 and 2 seasons, respectively. Average amounts of applied irrigation water under 125, 100, and 75% ETo irrigation levels treatment were 4450, 3710 and 2980 m ha, respectively. While the average water consumption were 3675, 2879 and 2140 m ha, respectively. The percentages of saved water were 20 and 50% for the 100 and 75 ETo, respectively as compared with the 125% ETo treatment. Average water use efficiency ...

Research paper thumbnail of Water management for maize grown in sandy soil under climate change conditions

Archives of Agronomy and Soil Science, 2014

Research paper thumbnail of Networked e-information services to support the e-learning process at UAE University

Electronic Library, The, 2007

PurposeThis paper aims to focus on how the e‐library interoperates with the e‐learning process wi... more PurposeThis paper aims to focus on how the e‐library interoperates with the e‐learning process within the academic computing environment (ACE) at the United Arab Emirates University (UAEU).Design/methodology/approachThis paper is inspired by the existing findings of a questionnaire survey conducted by the Laptop Project at the UAEU (2002‐2003) and sequel research (2004‐2005) on the acceptance and adoption of the Blackboard, a web‐based instructional platform, by the students. Personal interviews were conducted with the instructors who were involved in the e‐learning initiative to find out the appropriate e‐information services that should be provided to support their respective Blackboard‐aided courses.FindingsThe paper finds that the instructors have viewed e‐learning as a sound instructional tool and an evolving genre capable of providing more than just textual information. According to their viewpoints, the e‐library could support e‐learning courses with a bundle of networked e‐information services such as development of course‐related electronic collections, virtual reference help, current awareness and SDI, online document delivery, etc. E‐literacy was found to play an essential role in fostering adoption and acceptance of e‐learning, whereas the language barrier has constrained e‐learning initiative in the colleges where Arabic is the teaching language, i.e. Blackboard does not support creation of Arabic contents and interface so far.Practical implicationsThe capabilities of the e‐library in providing networked e‐information services have made the integration with the e‐learning process a highly urgent requirement.Originality/valueA model representing the integration of the e‐library functions with the e‐learning process is presented in the paper. The proposed model could be applicable in learning settings within an academic computing environment.

Research paper thumbnail of Water management of maize-cowpea intercropping system under surface irrigation

Zenodo (CERN European Organization for Nuclear Research), Mar 16, 2022

Research paper thumbnail of Productivity of date palm as affected by irrigation in a sandy soil

Zenodo (CERN European Organization for Nuclear Research), Jun 15, 2022

Research paper thumbnail of Approaches to increase the resiliency of Egyptian agriculture to climate change: An Overview

Zenodo (CERN European Organization for Nuclear Research), Jun 13, 2022

Research paper thumbnail of Combating Adverse Consequences of Climate Change on Maize Crop

SpringerBriefs in Water Science and Technology, 2015

In this chapter we investigated the effect of cultivating maize on raised beds and irrigation wit... more In this chapter we investigated the effect of cultivating maize on raised beds and irrigation with drip system on increasing national maize production through increasing productivity, reducing the applied irrigation water and use it to irrigate more land with maize. Under climate change, maize vulnerability can be reduced by the above practices. We also calculated the contribution of each option in reducing maize production-consumption gap under current climate and under climate change in 2040. The effect of these practices on water and land productivity under preset time and under climate change in 2040 was also examined. The results revealed that production-consumption gap in maize are about 45 %. The results also indicate that cultivating maize on raised beds or using drip system for irrigation reduced production-consumption gap under current climate and in 2040, where the percentage of imported maize will reduce to 23 and 12 % under both systems, respectively, under current climate and will reduce yield losses under climate change. The results also indicate that water productivity was the lowest under surface irrigation and was the highest when drip system was used under both current and climate change.

Research paper thumbnail of Pearl millet forage productivity under sprinkler irrigation system in sandy soil

Research paper thumbnail of Maximizing Land and Water Productivity by Intercropping Sunflower with Peanut under Sprinkler Irrigation

Alexandria Science Exchange Journal, 2018

Effective intercropping pattern, use of highly efficient irrigation system and proper irrigation ... more Effective intercropping pattern, use of highly efficient irrigation system and proper irrigation scheduling are one of the current challenges in agriculture sector for saving water, maximizing crop production and economic benefits. Thus, a two-year field experiment was conducted at Ismailia Research Station (30o 35' N latitude, 30o 26' E longitude, 20.0m above MSL), Egypt during the two growing seasons of 2016 and 2017 to study the effect of three irrigation treatments (1.2, 1.0 and 0.8 ETo calculated by the BIS model) and five peanut/sunflower intercropping patterns ((P1 = 100% peanut + 25 % sunflower), (P2 = 100% peanut + 33% sunflower), (P3 = 100% peanut + 50% sunflower), (P4 = sole peanut), and (P5 = sole sunflower)) on yield and its components of both crops, applied irrigation water, consumptive use, land and water productivity and net income. The experimental layout was designed in strip plot with three replicates. The results indicated that light intensity percentage significantly decreased with the 1.2 ETo treatment. The highest values of growth and yield of pod, seed and oil of peanut and sunflower were detected with the application of 1.2 ETo. Intercropping sunflower with peanut significantly reduced the yield of both crops in both seasons. However, intercropping sunflower at low density (P1) recorded the maximum values for yield and yield components of peanut, compared to the P2 and P3 treatments. The highest values of applied water (451 and 439mm) and consumptive use (403 and 415mm) were obtained in the first and second growing seasons, respectively when P3 (100% P + 50% S) was irrigated with 1.2 of ETo. Intercropping sunflower with peanut increased water use efficiency (kg/mm or cereal unit/mm) compared with sole crop. The average of water equivalent ratio was highest (1.255) produced with P3 under 1.0 ETo treatment, as average of both growing seasons. The maximum value of land equivalent ratio (1.569) and net income (L.E. 22589/ha) were recorded with P3 intercropping pattern irrigated with 1.2 of ETo treatment, on average basis of both growing seasons. Sunflower was the dominant component for the all intercropping systems, while peanut was the dominated crop. Thus, we recommend the implementation of P3 intercropping system, namely 100% peanut + 50% sunflower irrigated with 1.2 of ETo to increase land productivity in sandy soil under sprinkler irrigation or with 1.0 of ETo to save on the applied irrigation water, with yield lose were low. Under severe drought conditions, we recommended application of 0.8 ETo.

Research paper thumbnail of Required Interval of Weather Data for Proper Irrigation Scheduling

Egyptian Journal of Agronomy, 2019

C LIMATE variability is very common in Egypt recently, therefore studying its effects on irrigati... more C LIMATE variability is very common in Egypt recently, therefore studying its effects on irrigation scheduling for crops is important. The objective of this study was to define a number of years of former weather data prerequisite to estimate evapotranspiration (ETo) to schedule irrigation in three sites in Egypt (El-Gharbia, Beni Swief and Sohag). Daily values of weather data were collected for 10 years (2008-2017). Monthly ETo values were calculated by The BISm model. Descriptive statistics (mean, range, R 2 , CV and SD) were done to determine the temporal and spatial variability between monthly values of weather elements, as well as ETo. Furthermore, assessment of ETo values trend (decreasing or increasing) was done. The results showed that there were increasing temporal and spatial trends in the 10-year weather data, as well as ETo values in the 3 sites. However, it was more pronounced from 2015 to 2017. Furthermore, the results indicated that the range, CV% and SD were lower in the 3-year interval (2015-2017), compared to 10-year interval for all sites. There were stronger relationships between weather elements and ETo values in the 3-year interval, compared to 10year interval, as represented by R 2 values. Thus, it can be concluded that the recent 3-year interval is the most suitable interval for ETo calculation for proper irrigation scheduling to improve water management on field level in Egypt.

Research paper thumbnail of Water Productivity of Wheat Crop as Affected by Different Sowing Dates and Deficit Irrigation Treatments

Journal of Soil Sciences and Agricultural Engineering, 2017

Climate change scenarios require reconsidering different agricultural practices including sowing ... more Climate change scenarios require reconsidering different agricultural practices including sowing dates and irrigation intervals. For this purpose, a field experiment was carried out at the Agricultural Research Farm of Sakha Agricultural Research Station, Kafr-Elsheikh Governorate during the successive winter seasons 2013/2014 and 2014/2015 to investigate the impact of deficit water irrigation and sowing dates on wheat crop productivity(Triticum aestivum L.). The experimental site located at latitude of 30˚: 37͞ N, longitude of 31 ˚-57͞ E, and altitude of +6 meters above the sea level. The experimental design was splitplot with three replicates. The main plot was assigned to sowing dates of 15 th November (S 1) , 30 th November (S 2) and 15 th December (S 3), while the sub plot was assigned to irrigation treatments i.e. I 1 (given four irrigations plus the sowing irrigation, I 2 (given three irrigations following the sowing irrigation) and I 3 (given two irrigations after the sowing irrigation). The highest mean values of water applied (Wa) and consumptive use (CU) were 613.6 and 485.6 mm under treatment S 1 I 1 , respectively. While the corresponding lowest mean values were 363.3 and 310.4 mm under treatment S 3 I 3. The highest contribution percentages of rainfall to water applied (Wa) were 46.6% and 38.4 % for treatments S 3 I 3 under third sowing date in the first season. While, in the second season were 43.4% and 35.7% for treatments S 2 I 3 under the two sowing date, respectively. The lowest contribution percentages were 27.3%, 31.7 % and 27.8% , 32.4% for treatment S 1 I 1 under first sowing date in two seasons. Moreover, the highest mean values of grain water productively (WP g), straw water productively (WP s) were recorded under S 1 and I 3 in the first season with values of 1.47, 1.48, 2.27 and 2.19 kg m-3 , respectively. While in the second season the highest values were recorded under S 2 and I 3 with values 1.7, 1.59, 2.31 and 2.41 kg m-3 , respectively. The highest mean values of productivity of water applied for grain and straw (PWag , PWas) were recorded under S 2 , I 3 , in two growing seasons with

Research paper thumbnail of Irrigation and fertigation scheduling under drip irrigation for maize crop in sandy soil

International Agrophysics, 2016

Field experiments was conducted to determine the best irrigation scheduling and the proper period... more Field experiments was conducted to determine the best irrigation scheduling and the proper period for injecting fertilizers through drip irrigation water in a sandy soil to optimize maize yield and water productivity. Four irrigation levels (0.6, 0.8, 1.0 and 1.2) of the crop evapotranspiration and two fertigation periods (applying the recommended fertilizer dose in 60 and 80% of the irrigation time) were applied in a split-plot design, in addition to a control treatment which represented conventional irrigation and fertilization of maize in the studied area. The results showed that increasing the irrigation water amount and the fertilizer application period increased vegetative growth and yield. The highest grain yield and the lowest one were obtained under the treatment at 1.2 and of 0.6 crop evapotranspiration, respectively. The treatment at 0.8 crop evapotranspiration with fertilizer application in 80% of the irrigation time gave the highest water productivity (1.631 kg m−3) and...

Research paper thumbnail of Water management for wheat grown in sandy soil under climate change conditions

Journal of soil science and plant nutrition, 2012

The effect of fertigation regimes on wheat grown in sandy soil was tested in two field experiment... more The effect of fertigation regimes on wheat grown in sandy soil was tested in two field experiments in Egypt. The aim of the study was to determine the vulnerability of wheat to extreme weather event under climate change scenarios. Eight fertigation treatments, in addition to farmer irrigation were tested. Two climate change scenarios obtained from Hadley climate change model were incorporated in CropSyst model to assess wheat yield responses to fertigation regimes under these scenarios. The results showed that the highest yield and the highest water use efficiency (WUE) was obtained under irrigation application using 1.2 and 0.8 of Etc, respectively, with fertigation application in 80% of application time in both growing seasons. The calibration of CropSyst model confirmed that the model is able to mimic the growth of wheat and predicted grain, biological yield, and WUE with high degree of accuracy. The highest yield reduction and the lowest WUE under the tested climate change scenarios were obtained from farmer irrigation. It can be concluded that irrigating wheat grown in sandy soil with an amount of either 1.0 or 0.8 of ETc with fertigation application in 80% of application time is recommended to enhance growth and yield, and to reduce wheat's damage caused by extreme climate change.

Research paper thumbnail of Egyptian in Vitro and in Vivo Baculovirus Complex Models for Recombination Studies

Ahstrnct-Three major lepidopteran pests in Egypt, namely Phthoriiriaea operculella, Spodoptera li... more Ahstrnct-Three major lepidopteran pests in Egypt, namely Phthoriiriaea operculella, Spodoptera littoralis and Sesairiia cretica, are infected by a specific granulovirus (GV) and also nucleopolyhedroviruses (NPVs) with different degrees in their respective pathogenicity and persistency. This local situation and the existence of several isolates of these different viruses offer exceptional potentialities for the development of genetic studies, because of the availability of susceptible cell lines established from embryonic cells of the three species. Using experimental recombinations between GVs and also between GVs and NPVs will permit us to study the phenomenons which regulate the viral specificity, to study at the genetic level the differential biological properties of the baculoviruses, and finally to increase their potentialities.

Research paper thumbnail of Agro-environmental applications of humic substances: A critical review

Egyptian Journal of Soil Science, 2020

Research paper thumbnail of Maximizing Land and Water Productivity of Sudan-Grass Under Sprinkler Irrigation in Sandy Soil

A field experiment was conducted at Ismailia Research Station (30 35' N latitude, 30 26' ... more A field experiment was conducted at Ismailia Research Station (30 35' N latitude, 30 26' E longitude, 20.0m above mean sea level), Egypt during the 2016 and 2017 growing seasons to study the effect of three irrigation treatments (125, 100 and 75%ETo) on forage yield and its attributes of Sudan-grass crop. The effects of irrigation levels on the amounts of applied irrigation water, water consumptive use, water productivity on forage yield and its components, as well as its yield quality were studied. Results indicated that distribution uniformity values were 76 and 78% in 1 and 2 seasons, respectively. Average amounts of applied irrigation water under 125, 100, and 75% ETo irrigation levels treatment were 4450, 3710 and 2980 m ha, respectively. While the average water consumption were 3675, 2879 and 2140 m ha, respectively. The percentages of saved water were 20 and 50% for the 100 and 75 ETo, respectively as compared with the 125% ETo treatment. Average water use efficiency ...

Research paper thumbnail of Water management for maize grown in sandy soil under climate change conditions

Archives of Agronomy and Soil Science, 2014

Research paper thumbnail of Networked e-information services to support the e-learning process at UAE University

Electronic Library, The, 2007

PurposeThis paper aims to focus on how the e‐library interoperates with the e‐learning process wi... more PurposeThis paper aims to focus on how the e‐library interoperates with the e‐learning process within the academic computing environment (ACE) at the United Arab Emirates University (UAEU).Design/methodology/approachThis paper is inspired by the existing findings of a questionnaire survey conducted by the Laptop Project at the UAEU (2002‐2003) and sequel research (2004‐2005) on the acceptance and adoption of the Blackboard, a web‐based instructional platform, by the students. Personal interviews were conducted with the instructors who were involved in the e‐learning initiative to find out the appropriate e‐information services that should be provided to support their respective Blackboard‐aided courses.FindingsThe paper finds that the instructors have viewed e‐learning as a sound instructional tool and an evolving genre capable of providing more than just textual information. According to their viewpoints, the e‐library could support e‐learning courses with a bundle of networked e‐information services such as development of course‐related electronic collections, virtual reference help, current awareness and SDI, online document delivery, etc. E‐literacy was found to play an essential role in fostering adoption and acceptance of e‐learning, whereas the language barrier has constrained e‐learning initiative in the colleges where Arabic is the teaching language, i.e. Blackboard does not support creation of Arabic contents and interface so far.Practical implicationsThe capabilities of the e‐library in providing networked e‐information services have made the integration with the e‐learning process a highly urgent requirement.Originality/valueA model representing the integration of the e‐library functions with the e‐learning process is presented in the paper. The proposed model could be applicable in learning settings within an academic computing environment.