References of "Chtouki, Mohamed"
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See detailHumic acid coated P fertilizers to improve phosphorus use efficiency in calcareous soils
Chtouki, Mohamed ULiege; Lyamlouli, Karim; Oukarroum, Abdallah et al

Poster (2020, January 31)

Phosphorus mobility and availability in soil are mainly governed by both soil and fertilizers proprieties including soil P-sorption capacity, soil organic matter content, soil pH and P fertilizer ... [more ▼]

Phosphorus mobility and availability in soil are mainly governed by both soil and fertilizers proprieties including soil P-sorption capacity, soil organic matter content, soil pH and P fertilizer solubility. Although, the application of considerable P fertilizer rates in calcareous soils, containing high levels of calcium carbonate, P availability and uptake are extremely affected, which limit crop production in several cropping systems around the world. One approach to enhance P use efficiency and its agronomic benefits is to use humic substances (HS). In this regard, our study aims to assess the impact of P granular fertilizers coated with HS, on plant growth, mineral nutrition and P use efficiency. Two pot experiments were carried out at the OCP R&D Center using di-ammonium phosphate (DAP) coated with 0.5% of HS (extracted from leonardite) and applied at recommended doses on maize and tomato crops grown under sandy calcareous soil conditions (pH 8.0). As results, coating DAP with HS improved maize and tomato shoot dry weight by 6.2% and 16.8 % respectively, compared to uncoated DAP. Likewise, root dry weight (17% and 30%) and leaf chlorophyll content (+5%) were enhanced by HS coating. In addition, the use of HS improved greatly P uptake by 15% and 13% in both maize and tomato plants, which can have a benefic impact on P use efficiency. Under current calcareous soil conditions, the results showed also that HS improved nitrogen, potassium, iron and zinc plant uptake. [less ▲]

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See detailUse of precision farming practices and crop modelling for enhancing water and phosphorus efficiency
El-Mejjaouy, Yousra ULiege; Mamassi, Achraf ULiege; Chtouki, Mohamed ULiege et al

Poster (2019, October 07)

In a context of climate change, African agriculture aims at developing new approaches to face multiple constraints related to water scarcity, soil degradation or nutrients depletion. Nonrenewable ... [more ▼]

In a context of climate change, African agriculture aims at developing new approaches to face multiple constraints related to water scarcity, soil degradation or nutrients depletion. Nonrenewable resources such as phosphorus are of concern. Precision farming, as a new alternative to conventional agriculture, aims to improve crop productivity through the optimization of water and nutrients use efficiency. It considers the spatiotemporal variability of fields related to soil heterogeneity, plant nutrient needs and meteorological conditions through the growing season. For an effective management of soil and crop system, several new technologies have emerged, including soil-plant sensing, innovative crop management practices, and crop growth simulation and yield forecasting models. Regarding phosphorus management, use efficiency can be improved through the accurate assessment of phosphorus status in soil and plant. Proximal sensing based on visible near-infrared spectroscopy seems to be a promising alternative to manage soil fertility, understand phosphorus dynamics and enhance crop productivity. These aims can be also achieved by adopting hyper-frequent drip fertigation as an efficient agricultural practice, combined to hydrogeophysics to monitor water and nutrient fluxes in the soil-plant continuum. In addition, based on the interactions between meteorological conditions, soil properties and crop management, the use of agrometeorological models in simulation of crop growth parameters and forecasting crop production levels may allow assessing soil fertility and potential, ensuring an optimal future exploitation of farmland through the improvement of fertilization practices in an integrated management cropping system. [less ▲]

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See detailImprovement of the agronomic effectiveness of low-grade phosphate rock by physical, biological and chemical approaches under calcareous soil conditions
Chtouki, Mohamed ULiege; Lyamlouli, Karim; Bargaz, Adnane et al

Poster (2019, October 07)

Most agricultural soils in Morocco are alkaline with low organic matter and low water availability, which may limit direct application of phosphate rock (PR) and more specifically low-grade PR in ... [more ▼]

Most agricultural soils in Morocco are alkaline with low organic matter and low water availability, which may limit direct application of phosphate rock (PR) and more specifically low-grade PR in agriculture. To enhance the agronomic effectiveness of low-grade PR as to make it more convenient to a wide range of soils and crops, different approaches can be adopted. In this study, physical, biological and chemical treatments of PR were carried out and evaluated via agronomic trials on faba bean (Vicia faba) in terms of growth parameters, nutrients uptake and phosphorus (P) use efficiency under alkaline soil (pH 8.1) conditions. Physical treatments consisted of blending PR with soluble P fertilizer (TSP) at 75:25 and 50:50 ratios. Biological treatments were a mixture of PR, compost and phosphocompost elaborated from PR, sewage sludge and crop residues with the following ratio 20:46:34. Chemical treatment consisted of PR that was acidulated at 30% by phosphoric acid (H3PO4). All treatments except the control were amended with 120 mg P.Kg-1. Plants were also fertilized with nitrogen (N) and potassium (K) at rates equivalent to 40 and 120 kg.ha-1, respectively. After two months of faba bean pot cultivation, results indicated that all PR treatments significantly improved plant growth, root nodulation and nutrients uptake compared to control treatments. The relative agronomic effectiveness of PR treatments was significantly higher with phosphocompost treatment (90%) than both PR partially acidulated (80%) and PR blended with TSP 50:50 (66%). Likewise, P uptake, P apparent recovery efficiency, root nodules number and N uptake were also improved. Our findings revealed that the biological treatment based on phosphocompost yielded better as compared to chemical and physical treatments. [less ▲]

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See detailSoil Microbial Resources for Improving Fertilizers Efficiency in an Integrated Plant Nutrient Management System.
Bargaz, Adnane; Lyamlouli, Karim; Chtouki, Mohamed ULiege et al

in Frontiers in microbiology (2018), 9

Tomorrow's agriculture, challenged by increasing global demand for food, scarcity of arable lands, and resources alongside multiple environment pressures, needs to be managed smartly through sustainable ... [more ▼]

Tomorrow's agriculture, challenged by increasing global demand for food, scarcity of arable lands, and resources alongside multiple environment pressures, needs to be managed smartly through sustainable and eco-efficient approaches. Modern agriculture has to be more productive, sustainable, and environmentally friendly. While macronutrients such as nitrogen (N), phosphorus (P), potassium (K), and sulfur (S) supplied by mineral fertilizers are vital to crop production, agriculturally beneficial microorganisms may also contribute directly (i.e., biological N2 fixation, P solubilization, and phytohormone production, etc.) or indirectly (i.e., antimicrobial compounds biosynthesis and elicitation of induced systemic resistance, etc.) to crop improvement and fertilizers efficiency. Microbial-based bioformulations that increase plant performance are greatly needed, and in particular bioformulations that exhibit complementary and synergistic effects with mineral fertilization. Such an integrated soil fertility management strategy has been demonstrated through several controlled and non-controlled experiments, but more efforts have to be made in order to thoroughly understand the multiple functions of beneficial microorganisms within the soil microbial community itself and in interaction with plants and mineral resources. In fact, the combined usage of microbial [i.e., beneficial microorganisms: N2-fixing (NF), P-solubilizing, and P mobilizing, etc.] and mineral resources is an emerging research area that aims to design and develop efficient microbial formulations which are highly compatible with mineral inputs, with positive impacts on both crops and environment. This novel approach is likely to be of a global interest, especially in most N- and P-deficient agro-ecosystems. In this review, we report on the importance of NF bacteria and P solubilizing/mobilizing microbes as well as their interactions with mineral P fertilization in improving crop productivity and fertilizers efficiency. In addition, we shed light on the interactive and synergistic effects that may occur within multi-trophic interactions involving those two microbial groups and positive consequences on plant mineral uptake, crop productivity, and resiliency to environmental constraints. Improving use of mineral nutrients is a must to securing higher yield and productivity in a sustainable manner, therefore continuously designing, developing and testing innovative integrated plant nutrient management systems based on relevant biological resources (crops and microorganisms) is highly required. [less ▲]

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