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Soil, land care and environmental research
RESEARCH ARTICLE

No-tillage promotes C accumulation in soil and a slight increase in yield stability and profitability of rice in subtropical lowland ecosystems

Filipe Selau Carlos https://orcid.org/0000-0002-3068-0399 A , Flávio A. O. Camargo B , Elio Marcolin C , Murilo G. Veloso https://orcid.org/0000-0001-5358-5768 D , Rodrigo Schimitt Fernandes B and Cimélio Bayer https://orcid.org/0000-0001-8553-7330 B *
+ Author Affiliations
- Author Affiliations

A Department of Soil Science and Graduate Program on Soil and Water Conservation, Eliseu Maciel Faculty of Agronomy, Federal University of Pelotas, Pelotas, RS, Brazil.

B Department of Soil Science and Graduate Program in Soil Science, Faculty of Agronomy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.

C Rice Institute of Rio Grande do Sul State, Cachoeirinha, RS, Brazil.

D Graduate Program in Soil Science, Faculty of Agronomy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.

* Correspondence to: cimelio.bayer@ufrgs.br

Handling Editor: Somasundaram Jayaraman

Soil Research 60(6) 601-609 https://doi.org/10.1071/SR21185
Submitted: 2 July 2021  Accepted: 19 May 2022   Published: 21 June 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: The effects of no-tillage (NT) on soil organic C (SOC) and rice yield in lowland soils are poorly understood in subtropical ecosystems.

Aims: In a long-term (24 years) field experiment, we assessed the effect of NT on SOC stocks in labile (>53 μm, particulate) and stable (<53 μm, mineral associated) fractions of soil organic matter (SOM), grain yield, between-season stability, and gross margin compared to conventional tillage (CT) and pre-germinated tillage (PG) systems in a lowland Gleysol in southern Brazil.

Methods: Soil from eight different layers down to 40 cm under each tillage system was sampled in a field experiment, and additional soil samples were obtained from an adjacent area under native grassland (NG) as reference for SOC stocks.

Key results: While the PG and CT systems maintained similar SOC stocks as the NG soil, NT increased SOC stocks at an annual rate of 0.41 Mg ha−1 in relation to the traditional CT soil. Rice grain yield increased twice over the 24-year period, amounting to 12 Mg ha−1 in the last crop season. Despite lower yield in NT system in most crop seasons, a slight effect on yield stability and profitability (<10%) in favour of NT, compared with CT and PG systems, was observed.

Conclusions: Based on our findings, NT promotes C accumulation in subtropical paddy rice soils.

Implications: There is a beneficial effect of NT on rice yield stability and profitability in the long term.

Keywords: C lability, conservation soil management, no-till, paddy rice, profitability, soil organic matter, southern Brazil, yield.


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