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Impact of novel materials on alkalinity movement down acid soil profiles when combined with lime

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posted on 2025-05-28, 00:37 authored by Dominic LauricellaDominic Lauricella, Clayton R. Butterly, Zhe Weng, Gary ClarkGary Clark, Peter Sale, Guangdi Li, Caixian TangCaixian Tang
Purpose: Subsurface soil acidity in conjunction with aluminium (Al3+) toxicity is a major limitation to agricultural production globally. The conventional use of surface-applied lime is often insufficient at correcting subsurface acidity; therefore, new practices and ameliorants are required. Methods: This 3-month leaching experiment investigated whether animal wastes and other novel ameliorants in combination with lime could improve alkalinity movement, leading to greater amelioration of acid subsurface soil layers compared with lime alone. Five ameliorants (mature dairy compost, vegetable garden compost, poultry litter, potassium humate and gypsum) were added at a rate of 18 mg dry matter g−1 to the topsoil layer either without or with lime (target pH 5.5). Results: All ameliorants with lime improved alkalinity movement below the amended layer (0–10 cm), with pH increases of 0.03–0.10 units at 1 month and 0.02–0.20 units at 3 months. In comparison, the Al3+ concentrations in 10–12-cm and 12–15-cm layers were significantly decreased by 2–5.5 μg g−1. With lime, the improvements in alkalinity movement with ameliorants were in the order of gypsum > vegetable garden compost > potassium humate > poultry litter > mature dairy compost. Without lime, each amendment increased soil pH in the subsoil, with their effectiveness decreasing in the order of poultry litter > vegetable garden compost > mature dairy compost > gypsum > potassium humate. Conclusion: Some organic amendments are effective in addressing subsoil acidity. When combined with lime, their additive effects are limited.

Funding

This research was supported by Australian Postgraduate Award (APA), Securing Food, Water and the Environment top-up scholarship and the Grains Research and Development Corporation (GRDC) Project: DAN00206 Innovative approaches to managing subsoil acidity in the southern grain region.

History

Publication Date

2021-01-01

Journal

Journal of Soils and Sediments

Volume

21

Pagination

11p. (p. 52-62)

Publisher

Springer Nature

ISSN

1439-0108

Rights Statement

© Springer-Verlag GmbH Germany, part of Springer Nature 2020 This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s11368-020-02747-4