Does phosphogypsum application affect salts, nutrients, and trace elements displacement from saline soils?

Outbakat, M Barka; Choukr‐Allah, Redouane; Gharous, Mohamed El; Omari, Kamal El; Soulaimani, Aziz; Mejahed, Khalil El

doi:10.3389/fenvs.2022.964698

Cited by 4 publications

(4 citation statements)

References 60 publications

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“…Indeed, K and Mg contents could not affect the amendment application. On the other hand, several authors reported that G and PG applications increased K and Mg leaching from the soil [71,72]. He et al reported that Ca: Mg ratios did not influence clay dispersion of montmorillonite and kaolinite [73].…”

Section: Effect Of Amendment By Phosphogypsum/gypsum On Soil-aggregat...mentioning

confidence: 99%

Effect of Phosphogypsum on Soil Physical Properties in Moroccan Salt-Affected Soils

et al. 2022

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Salinity is one of the most critical challenges for crop production and soil and water management in arid and semi-arid regions, such as a large area of Morocco. These regions are characterized by low rainfall with an erratic distribution, long drought periods, and high evaporation, resulting in salt accumulation in the superficial layer of the soil and soil and water degradation. Therefore, phosphogypsum (PG) could be a promising amendment to reduce the salinity effect and improve soil quality in salt-affected soils. In this context, the present study aimed to evaluate the effect of PG on the physical properties of Luvisols and Cambisols collected from salt-affected soils in four regions in Morocco: Chichaoua, Ras El Ain, Sidi Zouine, and Sed El Masjoune. The treatments consisted of different rates of PG (15, 30, and 45 t/ha), natural Gypsum (G) (15 t/ha), and control. Our findings revealed that PG application improved soil structure by promoting flocculant action provided by calcium. Linear regression indicated that Water Aggregate Stability (WAS) and PG doses were strongly correlated with a high coefficient of determination (R2 = 93.41%, P value < 0.05). Compared to the control, the overall efficiency of 45 t/ha of PG amendment reached 53%, 95%, and 36%, respectively, in Chichaoua, Ras El Ain, and Sed El Masjoune soils. PG application presented a positive effect on other soil physical properties (soil hydraulic properties, total porosity, and bulk density), especially for the soils of Chichaoua and Ras El Ain regions. The total porosity was increased by 8% with 45 t PG/ha in Ras El Ain soil, and in Chichaoua soil, the bulk density was 5% lower in the pot treated with 45 t PG/ha compared to the control. This study supports the use of PG as an amendment for reclaiming salt-affected soils through monitoring agronomic and environmental impacts.

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Section: Effect Of Amendment By Phosphogypsum/gypsum On Soil-aggregat...mentioning

confidence: 99%

Effect of Phosphogypsum on Soil Physical Properties in Moroccan Salt-Affected Soils

et al. 2022

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“…Phosphogypsum is a low-cost co-product of the phosphoric acid industry, which is produced in several African countries such as Morocco, Tunisia, South Africa, Egypt, and Senegal [6][7][8][9][10][11] . Phosphogypsum finds extensive application in agriculture as an amendment for depleted soils (including saline, sodic, alkaline, and acidic) and as a fertilizer 12 . Phosphogypsum contains a variety of essential nutrients crucial for plant growth and development, such as calcium (Ca), sulfur (S) and phosphorus (P).…”

Section: Introductionmentioning

confidence: 99%

Phosphogypsum as Fertilizer: Impacts on Soil Fertility, Barely Yield Components, and Heavy Metals Contents

OUTBAKAT,

Bouray,

Choukr‑Allah

et al. 2024

Preprint

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Fertilization is a critical input factor in crop production and food security achievement. However, there is room for improvement in the application of fertilizers in certain regions. Thus, using low-cost fertilizers, such as phosphogypsum (PG), could enhance farmers' access to these essential inputs. A two-years field experiment was conducted using two Moroccan PG products applied at four rates (0, 1.5, 3, and 4.5 t/ha). The aim was to assess the impact of PG source and rate on barley crop, including yield component, nutrients uptake, and heavy metals content. The study's findings revealed that as the rate of PG application increased, there were significant enhancements in the number of spikes, tillers, grains, total biomass, grain yield, and thousand grains weight. In fact, when compared to the control, the application of 1.5, 3, and 4.5 t/ha of PG led to a remarkable increase in grain yield by 21%, 34%, and 39%, respectively. Furthermore, the uptake of nutrients by the shoots and grains was significantly influenced by the PG application rates, with higher rates resulting in greater nutrient uptake. Notably, the application of PG had no impact on the heavy metal content in shoots, grains, or soil.

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“…The utilization of PG in agriculture as an amendment has become a topic of considerable interest, not only because of its potential benefits but also because of concerns regarding its handling, storage, and recycling. For instance, PG has been widely used to ameliorate physical and chemical properties of degraded soils, including salinesodic soils (Outbakat et al, 2022) and acid soils (Bouray et al, 2022). Phosphogypsum contains soluble and insoluble elements and impurities.…”

Section: Introductionmentioning

confidence: 99%

Does phosphogypsum addition affect phosphate rock dissolution in acid soils?

Bouray

Moir

Mejahed

et al. 2023

Front. Environ. Sci.

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The direct application of phosphate rock (PR) has been found suitable for acidic soils. Still, efforts are needed to improve its reactivity to match grassland P demand. This research aimed to investigate changes in the dissolution of two Moroccan sedimentary PRs (Ben Guerir and Khouribga) in response to four rates of phosphogypsum (PG)—a by-product of the phosphate fertilizer industry. We conducted a 60-day incubation study using two acid soils from New Zealand. The soils were treated with PRs at 100 mgP kg−1 of soil either alone or combined with PG, which was applied at 0, 1, 3 and 9 t ha−1 (approximately the equivalent of 0, 0.9, 2.7, and 8.1 g of PG kg−1 of soil, respectively). The dissolution rates were determined from the differences in residual calcium (Ca) extracted with 1 M HCl. Soil pH, Olsen P, exchangeable aluminium (Al) and Ca and Ca saturation were analyzed at the end of the experiment. Phosphate rocks and PG’s physicochemical properties were characterized. Phosphogypsum addition increased Olsen P by 34% and 59% at 9 t ha−1 compared to 0 t ha−1 in Molesworth and Lindis Peaks soils, respectively. However, PG did not affect the dissolution of PRs in the different of soil types. Khouribga PR was more reactive than Ben Guerir PR, especially in the Molesworth soil where soil pH and base saturation were lower and P retention was higher compared to Lindis Peaks soil. Particle size distribution was the key factor that contributed to the observed greater reactivity of the Khouribga PR. Both PRs showed dissolution rates >50%, suggesting their suitability for direct application on acid soils. Being an important source of sulphur and some P, PG if combined with PR, can promote and complement PR’s direct use as fertilizer on acid soils. Moreover, the development of new fertilizer products by combining these two materials should be encouraged.

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Does phosphogypsum application affect salts, nutrients, and trace elements displacement from saline soils?

Cited by 4 publications

References 60 publications

Effect of Phosphogypsum on Soil Physical Properties in Moroccan Salt-Affected Soils

Effect of Phosphogypsum on Soil Physical Properties in Moroccan Salt-Affected Soils

Phosphogypsum as Fertilizer: Impacts on Soil Fertility, Barely Yield Components, and Heavy Metals Contents

Does phosphogypsum addition affect phosphate rock dissolution in acid soils?

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