Phosphorus Fractions in Sodic Soils of the Great Ethiopian Rift Valley Soils as Affected by Reclamation

Alemayehu, K.; Sheleme, B.; Schoenau, Jeff J.

doi:10.1080/00103624.2017.1416127

Cited by 6 publications

(1 citation statement)

References 23 publications

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“…After a period of 90 days of incubation, the soil in each plastic pot was leached for 28 days, which is equivalent to one month. To determine the pore volume of water prior to the leaching process, the soil in the plastic pots was saturated with a specific amount of water from the bottom of the pot until water appeared on the top of the soil [ 70 ]. The determined 2.5 L of water was applied to each pot, considering evaporation loss of 5% under ideal conditions with low wind, clay, or organic-rich soil, large pots, and slow and deep irrigation [ 71 ].…”

Section: Methodsmentioning

confidence: 99%

Elucidating Amendment Resources for Reclaiming Efficacy of Sodic Soils around Abaya and Chamo Lakes, South Ethiopia Rift Valley

Walche,

Haile,

Kiflu

et al. 2024

Toxics

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Background: Sodic soils are harmful to agricultural and natural environments in Ethiopia’s semi-arid and arid regions, leading to soil degradation and reduced productivity. This study investigated how amendment resources could help improve the chemical properties of sodic soils around the Abaya and Chamo Lakes in the South Ethiopia Rift Valley. Methods: A factorial experiment was conducted to study the effects of gypsum (GYP) and farmyard manure (FYM) on sodic soil reclamation. The experiment had four levels of GYP (0, 50, 100, and 150%) and four levels of FYM (0, 10, 20, and 30 tons ha−1), with three replications. The pots were incubated for three months and leached for one month, after which soil samples were collected and analyzed for chemical properties. ANOVA was performed to determine the optimal amendment level for sodic soil reclamation. Results: The study found that applying 10 ton FYM ha−1 and gypsum at 100% gypsum required (GR) rate resulted in a 99.8% decrease in exchangeable sodium percentages (ESP) compared to untreated composite sodic soil and a 1.31% reduction over the control (GYP 0% + FYM 0 ton ha−1). As a result, this leads to a decrease in soil electrical conductivity, exchangeable sodium (Ex. Na), and ESP values. The results were confirmed by the LSD test at 0.05. It is fascinating to see how different treatments can have such a significant impact on soil properties. The prediction models indicate that ESP’s sodic soil treatment effect (R2 = 0.95) determines the optimal amendment level for displacing Ex. Na from the exchange site. The best estimator models for ESP using sodic soil treatment levels were ESP = 1.65–0.33 GYP for sole gypsum application and ESP = 1.65–0.33 GYP + 0.28 FYM for combined GYP and FYM application, respectively. Conclusion: The study found that combined GYP and FYM applications reduced ESP to less than 10% in agriculture, but further research is needed to determine their effectiveness at the field level.

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Section: Methodsmentioning

confidence: 99%