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Soil Research Soil Research Society
Soil, land care and environmental research

Volume 62 Number 4 2024

Land degradation has impacted the environment significantly, where soil fertility, food production, water, and an array of ecosystem services have been compromised. Research in this paper investigates the potential for compost and biochar amendments to improve native plant growth in land remediation, for which most benefits were revealed from a mixture of compost and biochar. Land remediation projects may wish to utilise the unique benefits of a compost-biochar mixture in establishing plants used in this study.

SR23133Alpine meadow degradation decreases soil P availability by altering phoD-harbouring bacterial diversity

Yanuo Zou, Xiangtao Wang, Jie Wang, Lu Zhang, Lirong Liao, Guobin Liu, Zilin Song and Chao Zhang 0000-0003-2647-2922

Understanding how the phosphorus (P) availability changes with meadow degradation is essential for the restoration of the alpine ecosystem. We investigated the phoD-harbouring bacterial community in four alpine meadows along a degradation gradient on the Tibetan Plateau and found alpine meadow degradation decreases soil P availability by regulating phoD-harbouring bacterial community diversity and alkaline phosphates, with soil water supply and plant biomass being the main driving factors. This study revealed the mechanisms of decreased P availability during alpine meadow degradation.

SR23205Physical properties and organic carbon in no-tilled agricultural systems in silty Pampas soils of Argentina

Guillermo Ezequiel Peralta 0000-0001-5628-0222, Rodolfo Cesáreo Gil, María Belén Agosti, Carina Rosa Álvarez 0000-0003-4590-7901 and Miguel Ángel Taboada

In the Argentine Pampas, continuous no-till farming has led to deterioration in soil structure, affecting crop yields. We investigated production situations with different cropping intensification to improve soil health. While increased cropping intensity resulted in higher carbon inputs, improvements in soil physical properties were absent. It is important to design management strategies that not only allow for increased yields but also improve the physical quality of the soil.

Soil materials can be delivered to depth from both in situ and ex situ materials. Results demonstrate that soil material from the surface can reach depths of up to 80 cm near the hillslope crest and 2.2 m at the base of the hillslope and a relatively rapid (decadal time scale) translocation.

Mango cultivation is a profitable proposition for growers. However, mango yields vary considerably, with years of optimum or heavy fruiting (‘on year’) followed by little or no fruiting (‘off year’). Application of paclobutrazol (PBZ) is often used to address this alternate bearing problem. However, PBZ has a detrimental effect on soil health by impacting the microbial community and related functions. This study examines the impact of PBZ on soil microorganisms using a high-throughput sequencing technique.

SR24034Organic carbon and short-range order minerals responsible for cementation of the spodic horizon (ortstein): a new proposal of chemical extractions in undisturbed samples

Mateus Roveda Pilar, Vander Freitas Melo 0000-0003-0761-1536, Luis Fernando Roveda, Marcelo Ricardo Lima and Jairo Calderari de Oliveira Junior 0000-0003-3818-0513

Oststein in Spodosols limits the drainage of these sandy soils (normally sand content >95%) and increases nutrient retention in the profile, increasing plant production. We used more reliable undisturbed samples of ortstein horizon and a new chemical extraction protocol, differing from the use of powdered samples in the literature. The destruction of soil structure in disturbed samples results in the loss of mineral and organic phase that could be clogging the sample pores. We believe that our work encourages worldwide orststein horizon studies.

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Best Student-Led Paper

The Best Student-Led Paper published in 2023 has been awarded to Guilherme Oliveira Andrade da Silva.

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