A Quantitative Reconstruction of Nutrient Changes of Quaternary Red Soils (Luvisols) Affected by Land-Use Patterns

Article Agronomy

Thickness of a Compost Layer on the Distribution of Water and Nutrients in a Surface-Drip-Irrigated Sandy Soil Column

Jiahao Zhang et al.

Summary: The management of crop production in sandy soil is challenging due to low soil-water-holding capacity and poor fertilizer efficiency. Methods to increase soil water and nutrient retention include adding surface mulch covers, biochar amendment, and using layers of charcoal and compost mixture. Experimental results showed that a 5 cm compost layer can better retain root zone water and fertilizer, reducing the need for base fertilizer input.

AGRONOMY-BASEL (2023)

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Article Agronomy

The Influence of Municipal Solid Waste Compost on the Tranformations of Phosphorus Forms in Soil

Magdalena Debicka et al.

Summary: Searching for a renewable phosphorus source for agricultural soils is a global challenge. Depletion of global phosphate resources and the risk of environmental problems caused by excessive P mobility have made this topic one of the most important environmental issues. This study analysed the transformation of P forms in municipal solid waste compost (MSWC) at different maturity stages, assessed the effects of MSWC application on soil P status, and evaluated the suitability of MSWC as a potential P source for agricultural soils. The results showed that MSWC had a positive effect on available P content in the soil. The content of potentially mobile P forms increased significantly, particularly with the introduction of immature MSWC, indicating its potential as a P source with minimal environmental risk.

AGRONOMY-BASEL (2023)

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Article Agronomy

Modeling Topsoil Phosphorus-From Observation-Based Statistical Approach to Land-Use and Soil-Based High-Resolution Mapping

Anne Kull et al.

Summary: Phosphorus (P) is an important nutrient for terrestrial ecosystems, but its availability is often limited, while excessive P can cause eutrophication in aquatic systems. Understanding P dynamics requires detailed observation-based data, which we obtained from over 388,000 soil samples. With these data, we developed a mapping approach to estimate topsoil P at a national level, enabling precision farming and assessment of P load in water bodies.

AGRONOMY-BASEL (2023)

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Article Geochemistry & Geophysics

Potassium isotope fractionation during chemical weathering in humid and arid Hawaiian regoliths

Wenshuai Li et al.

Summary: The controls on potassium (K) isotope fractionation during chemical weathering are evaluated using two regolith profiles developed over -350 kyr on the humid and arid sides of Kohala Mountain, Hawai'i. The findings suggest that potassium enrichment and loss occur in both regolith profiles, with the humid profile showing significant potassium enrichment in shallow horizons and loss in deeper horizons. The presence of K-bearing mineral aerosols in the humid regolith may explain the apparent contradiction between enrichment and loss. Climate, weathering, plant cycling, and the addition of marine and mineral aerosols all contribute to the potassium isotope composition in Hawaiian regoliths.

GEOCHIMICA ET COSMOCHIMICA ACTA (2022)

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Article Soil Science