El hassan Mayad | Ibn Zohr University, Agadir, Morocco (original) (raw)
Uploads
Soil nematode abundance and functional group by El hassan Mayad
as the most abundant animals on earth, nematodes are a dominant component of the soil community. ... more as the most abundant animals on earth, nematodes are a dominant component of the soil community. they play critical roles in regulating biogeochemical cycles and vegetation dynamics within and across landscapes and are an indicator of soil biological activity. Here, we present a comprehensive global dataset of soil nematode abundance and functional group composition. This dataset includes 6,825 georeferenced soil samples from all continents and biomes. For geospatial mapping purposes these samples are aggregated into 1,933 unique 1-km pixels, each of which is linked to 73 global environmental covariate data layers. Altogether, this dataset can help to gain insight into the spatial distribution patterns of soil nematode abundance and community composition, and the environmental drivers shaping these patterns.
Applications of New Rhizobacteria Pseudomonas Isolates in Agroecology via Fundamental Processes Complementing Plant Growth, 2019
Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of... more Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of them have been reported as plant growth-promoting rhizobacteria. In the present work, tomato (Solanum lycopersicum) seeds were germinated in greenhouse conditions, and the seedling height, length of plants, collar diameter and number of leaves were measured from plants grown in soil inoculated by bacterial isolates. Pseudomonas isolates were isolated from the rhizosphere. We used the newman-Keuls test to ascertain pairwise differences. Isolates were identified as a new Pseudomonas species by rpoD gene sequencing. the results showed that isolates of Pseudomonas sp. (Q6B) increased seed germination (P = 0.01); Pseudomonas sp. (Q6B, Q14B, Q7B, Q1B and Q13B) also promoted seedling height (P = 0.01). All five isolates promoted plant length and enlarged the collar diameter (P = 0.01). Pseudomonas sp. (Q1B) also increased leaf number (P = 0.01). The investigation found that Pseudomonas isolates were able to solubilize phosphate, produce siderophores, ammonia, and indole-3-acetic acid and colonize the roots of tomato plants. This study shows that these five novel Pseudomonas sp. isolates can be effective new plant growth-promoting rhizobacteria.
Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of... more Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of them have been reported as plant growth-promoting rhizobacteria. In the present work, tomato (Solanum lycopersicum) seeds were germinated in greenhouse conditions, and the seedling height, length of plants, collar diameter and number of leaves were measured from plants grown in soil inoculated by bacterial isolates. Pseudomonas isolates were isolated from the rhizosphere. We used the newman-Keuls test to ascertain pairwise differences. Isolates were identified as a new Pseudomonas species by rpoD gene sequencing. the results showed that isolates of Pseudomonas sp. (Q6B) increased seed germination (P = 0.01); Pseudomonas sp. (Q6B, Q14B, Q7B, Q1B and Q13B) also promoted seedling height (P = 0.01). All five isolates promoted plant length and enlarged the collar diameter (P = 0.01). Pseudomonas sp. (Q1B) also increased leaf number (P = 0.01). The investigation found that Pseudomonas isolates were able to solubilize phosphate, produce siderophores, ammonia, and indole-3-acetic acid and colonize the roots of tomato plants. This study shows that these five novel Pseudomonas sp. isolates can be effective new plant growth-promoting rhizobacteria.
Composting of tomato plant residues: improvement of composting process and compost quality by integration of sheep manure, 2019
In Morocco, greenhouse tomato production is a source of organic waste. This biomass constitutes a... more In Morocco, greenhouse tomato production is a source of organic waste. This biomass constitutes an important source of carbon, macronutrients (NPK), and microelements (Mn, Zn, Cu, and Fe). This research aims to investigate the composting process of tomato plant residues by sheep manure integration at different proportions and its effect on organic matter mineralization and humification, nitrogen dynamics, and agronomic value of the final compost. The composting process was run in an experimental conditions using two different mixing ratios set up on volume basis: R1 (2:3 tomato plant residues "TPR" + 1:3 sheep manure "SM") and R2 (1:3 tomato plant residues "TPR" + 2:3 sheep manure "SM") and two controls TRP (1:1 tomato plant residues "TPR") and SM (1:1 sheep manure). Parameters such as temperature, pH, EC, C:N ratio, mineral nitrogen, and macroelements (phosphorus and potassium) were measured for a period of 60 days. At the end of the experiment , compost humification ratio and compost quality were assessed. Results showed that when TPR is composted alone, nitrogen loss and lack of aeration were observed due to a lower C:N ratio and higher moisture content. The addition of sheep manure in treatment R2 not only resulted in reaching rapidly thermophile phase and maintaining it for longer periods, but also it reduced N loss, decreased electrical conductivity, and increased concentrations of humic acid and macroelements. The present results provide opportunities to improve composting of TPR as well as the agronomic quality of the produced compost by sheep manure integration.
Papers by El hassan Mayad
Journal of Plant Protection Research, 2018
The two-spotted spider mite (Tetranychus urticae Koch) is an important pest of many horticultural... more The two-spotted spider mite (Tetranychus urticae Koch) is an important pest of many horticultural crops. A study was conducted to evaluate the effect of three fluorescent Pseudomonas isolates obtained from rhizospheric soil of tomato (Solanum lycopersicon) in Agadir, Morocco: Q110B, Q036B and Q172B, as potential biological control agents for T. urticae. Both acaricide and repellent activities were assessed on homogenous adult mites. The acaricidal activity test evaluated five concentrations of bacterial suspensions: 0 (control), 102, 104, 106, 108, and 1010 cfu · ml−1, while only the 1010 cfu ∙ ml−1 concentration of each bacterium was used for the repellent bioassay. The mortality rate and repellentindex were recorded 24, 48 and 72 h after application. Results indicated that the survival rate of T. urticae was reduced (p ≤ 0.01) by all three bacterial isolates compared to control. Within the 24–72 h time period the mortality rates ranged from 8 to 87%, 16 to 99%, and 13 to 89%, for ...
Expert Systems in Finance, 2019
Sustainability
Free-living nematodes have beneficial effects on plant growth and nutrition. Exploring how agricu... more Free-living nematodes have beneficial effects on plant growth and nutrition. Exploring how agricultural practices modulate these beneficial effects is still challenging. A study was conducted in Ferralsols from Madagascar from one unmanaged grassland and 16 upland rainfed rice fields, representative of different agricultural practices: rotation, agroforestry and monoculture. Intact soil cores in plastic cylinders were sampled in the field to assess the effects of agricultural practices on changes in plant growth and nutrition induced by the presence of bacterial-feeding nematodes. The soil cores were fumigated to kill the nematodes and moistened with a filtered fresh soil suspension containing only microbial cells. A rice seed was introduced in the core, which was then incubated under natural climatic conditions for 40 days with or without inoculation of the bacterial-feeding nematode Acrobeloides sp. The inoculation of the nematodes induced lower, similar or higher plant biomass an...
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Environmental Science and Pollution Research
as the most abundant animals on earth, nematodes are a dominant component of the soil community. ... more as the most abundant animals on earth, nematodes are a dominant component of the soil community. they play critical roles in regulating biogeochemical cycles and vegetation dynamics within and across landscapes and are an indicator of soil biological activity. Here, we present a comprehensive global dataset of soil nematode abundance and functional group composition. This dataset includes 6,825 georeferenced soil samples from all continents and biomes. For geospatial mapping purposes these samples are aggregated into 1,933 unique 1-km pixels, each of which is linked to 73 global environmental covariate data layers. Altogether, this dataset can help to gain insight into the spatial distribution patterns of soil nematode abundance and community composition, and the environmental drivers shaping these patterns.
Applications of New Rhizobacteria Pseudomonas Isolates in Agroecology via Fundamental Processes Complementing Plant Growth, 2019
Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of... more Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of them have been reported as plant growth-promoting rhizobacteria. In the present work, tomato (Solanum lycopersicum) seeds were germinated in greenhouse conditions, and the seedling height, length of plants, collar diameter and number of leaves were measured from plants grown in soil inoculated by bacterial isolates. Pseudomonas isolates were isolated from the rhizosphere. We used the newman-Keuls test to ascertain pairwise differences. Isolates were identified as a new Pseudomonas species by rpoD gene sequencing. the results showed that isolates of Pseudomonas sp. (Q6B) increased seed germination (P = 0.01); Pseudomonas sp. (Q6B, Q14B, Q7B, Q1B and Q13B) also promoted seedling height (P = 0.01). All five isolates promoted plant length and enlarged the collar diameter (P = 0.01). Pseudomonas sp. (Q1B) also increased leaf number (P = 0.01). The investigation found that Pseudomonas isolates were able to solubilize phosphate, produce siderophores, ammonia, and indole-3-acetic acid and colonize the roots of tomato plants. This study shows that these five novel Pseudomonas sp. isolates can be effective new plant growth-promoting rhizobacteria.
Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of... more Pseudomonas isolates have frequently been isolated from the rhizosphere of plants, and several of them have been reported as plant growth-promoting rhizobacteria. In the present work, tomato (Solanum lycopersicum) seeds were germinated in greenhouse conditions, and the seedling height, length of plants, collar diameter and number of leaves were measured from plants grown in soil inoculated by bacterial isolates. Pseudomonas isolates were isolated from the rhizosphere. We used the newman-Keuls test to ascertain pairwise differences. Isolates were identified as a new Pseudomonas species by rpoD gene sequencing. the results showed that isolates of Pseudomonas sp. (Q6B) increased seed germination (P = 0.01); Pseudomonas sp. (Q6B, Q14B, Q7B, Q1B and Q13B) also promoted seedling height (P = 0.01). All five isolates promoted plant length and enlarged the collar diameter (P = 0.01). Pseudomonas sp. (Q1B) also increased leaf number (P = 0.01). The investigation found that Pseudomonas isolates were able to solubilize phosphate, produce siderophores, ammonia, and indole-3-acetic acid and colonize the roots of tomato plants. This study shows that these five novel Pseudomonas sp. isolates can be effective new plant growth-promoting rhizobacteria.
Composting of tomato plant residues: improvement of composting process and compost quality by integration of sheep manure, 2019
In Morocco, greenhouse tomato production is a source of organic waste. This biomass constitutes a... more In Morocco, greenhouse tomato production is a source of organic waste. This biomass constitutes an important source of carbon, macronutrients (NPK), and microelements (Mn, Zn, Cu, and Fe). This research aims to investigate the composting process of tomato plant residues by sheep manure integration at different proportions and its effect on organic matter mineralization and humification, nitrogen dynamics, and agronomic value of the final compost. The composting process was run in an experimental conditions using two different mixing ratios set up on volume basis: R1 (2:3 tomato plant residues "TPR" + 1:3 sheep manure "SM") and R2 (1:3 tomato plant residues "TPR" + 2:3 sheep manure "SM") and two controls TRP (1:1 tomato plant residues "TPR") and SM (1:1 sheep manure). Parameters such as temperature, pH, EC, C:N ratio, mineral nitrogen, and macroelements (phosphorus and potassium) were measured for a period of 60 days. At the end of the experiment , compost humification ratio and compost quality were assessed. Results showed that when TPR is composted alone, nitrogen loss and lack of aeration were observed due to a lower C:N ratio and higher moisture content. The addition of sheep manure in treatment R2 not only resulted in reaching rapidly thermophile phase and maintaining it for longer periods, but also it reduced N loss, decreased electrical conductivity, and increased concentrations of humic acid and macroelements. The present results provide opportunities to improve composting of TPR as well as the agronomic quality of the produced compost by sheep manure integration.
Journal of Plant Protection Research, 2018
The two-spotted spider mite (Tetranychus urticae Koch) is an important pest of many horticultural... more The two-spotted spider mite (Tetranychus urticae Koch) is an important pest of many horticultural crops. A study was conducted to evaluate the effect of three fluorescent Pseudomonas isolates obtained from rhizospheric soil of tomato (Solanum lycopersicon) in Agadir, Morocco: Q110B, Q036B and Q172B, as potential biological control agents for T. urticae. Both acaricide and repellent activities were assessed on homogenous adult mites. The acaricidal activity test evaluated five concentrations of bacterial suspensions: 0 (control), 102, 104, 106, 108, and 1010 cfu · ml−1, while only the 1010 cfu ∙ ml−1 concentration of each bacterium was used for the repellent bioassay. The mortality rate and repellentindex were recorded 24, 48 and 72 h after application. Results indicated that the survival rate of T. urticae was reduced (p ≤ 0.01) by all three bacterial isolates compared to control. Within the 24–72 h time period the mortality rates ranged from 8 to 87%, 16 to 99%, and 13 to 89%, for ...
Expert Systems in Finance, 2019
Sustainability
Free-living nematodes have beneficial effects on plant growth and nutrition. Exploring how agricu... more Free-living nematodes have beneficial effects on plant growth and nutrition. Exploring how agricultural practices modulate these beneficial effects is still challenging. A study was conducted in Ferralsols from Madagascar from one unmanaged grassland and 16 upland rainfed rice fields, representative of different agricultural practices: rotation, agroforestry and monoculture. Intact soil cores in plastic cylinders were sampled in the field to assess the effects of agricultural practices on changes in plant growth and nutrition induced by the presence of bacterial-feeding nematodes. The soil cores were fumigated to kill the nematodes and moistened with a filtered fresh soil suspension containing only microbial cells. A rice seed was introduced in the core, which was then incubated under natural climatic conditions for 40 days with or without inoculation of the bacterial-feeding nematode Acrobeloides sp. The inoculation of the nematodes induced lower, similar or higher plant biomass an...
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Environmental Science and Pollution Research
Journal of Essential Oil Bearing Plants
Environmental Science and Pollution Research
Materials Today: Proceedings
International Journal of Pest Management
Organic Agriculture
In Morocco, greenhouse tomato production is a source of organic waste. This biomass constitutes a... more In Morocco, greenhouse tomato production is a source of organic waste. This biomass constitutes an important source of carbon, macronutrients (NPK), and microelements (Mn, Zn, Cu, and Fe). This research aims to investigate the composting process of tomato plant residues by sheep manure integration at different proportions and its effect on organic matter mineralization and humification, nitrogen dynamics, and agronomic value of the final compost. The composting process was run in an experimental conditions using two different mixing ratios set up on volume basis: R1 (2:3 tomato plant residues "TPR" + 1:3 sheep manure "SM") and R2 (1:3 tomato plant residues "TPR" + 2:3 sheep manure "SM") and two controls TRP (1:1 tomato plant residues "TPR") and SM (1:1 sheep manure). Parameters such as temperature, pH, EC, C:N ratio, mineral nitrogen, and macroelements (phosphorus and potassium) were measured for a period of 60 days. At the end of the experiment , compost humification ratio and compost quality were assessed. Results showed that when TPR is composted alone, nitrogen loss and lack of aeration were observed due to a lower C:N ratio and higher moisture content. The addition of sheep manure in treatment R2 not only resulted in reaching rapidly thermophile phase and maintaining it for longer periods, but also it reduced N loss, decreased electrical conductivity, and increased concentrations of humic acid and macroelements. The present results provide opportunities to improve composting of TPR as well as the agronomic quality of the produced compost by sheep manure integration.
Journal of Plant Protection Research
The two-spotted spider mite (Tetranychus urticae Koch) is an important pest of many horticultural... more The two-spotted spider mite (Tetranychus urticae Koch) is an important pest of many horticultural crops. A study was conducted to evaluate the effect of three fluorescent Pseudomonas isolates obtained from rhizospheric soil of tomato (Solanum lycopersicon) in Agadir, Morocco: Q110B, Q036B and Q172B, as potential biological control agents for T. urticae. Both acaricide and repellent activities were assessed on homogenous adult mites. The acaricidal activity test evaluated five concentrations of bacterial suspensions: 0 (control), 102, 104, 106, 108, and 1010 cfu · ml−1, while only the 1010 cfu ∙ ml−1 concentration of each bacterium was used for the repellent bioassay. The mortality rate and repellentindex were recorded 24, 48 and 72 h after application. Results indicated that the survival rate of T. urticae was reduced (p ≤ 0.01) by all three bacterial isolates compared to control. Within the 24–72 h time period the mortality rates ranged from 8 to 87%, 16 to 99%, and 13 to 89%, for ...