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Sustainability 2016, 8(9), 841;

Improving Farming Practices for Sustainable Soil Use in the Humid Tropics and Rainforest Ecosystem Health

Programa de Pós-Graduação em Agroecologia, Universidade Estadual do Maranhão, São Luís 65054-970, Brazil
Departamento de Biologia, Universidade Federal do Maranhão, São Luís 65080-805, Brazil
Author to whom correspondence should be addressed.
Academic Editor: Tiziano Gomiero
Received: 25 April 2016 / Revised: 17 August 2016 / Accepted: 19 August 2016 / Published: 29 August 2016
(This article belongs to the Special Issue Critical Issues on Soil Management and Conservation)
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Unsustainable farming practices such as shifting cultivation and slash-and-burn agriculture in the humid tropics threaten the preservation of the rainforest and the health of the local and global environment. In weathered soils prone to cohesion in humid tropic due to low Fe and carbon content and the enormous amounts of P that can be adsorbed, sustainable soil use is heavily dependent on the availability and efficient use of nutrients. This paper reviews the literature in the field and provides some insights about sustainable soil use in the humid tropics, mainly for the Brazilian Amazonia region. Careful management of organic matter and physical and chemical indicators is necessary to enhance root growth and nutrient uptake. To improve the rootability of the arable layer, a combination of gypsum with continuous mulching to increase the labile organic matter fraction responsible for the formation of a short-lived structure important for root growth is recommended, rather than tillage. Unlike mulching, mechanical disturbance via ploughing of Amazonian soils causes very rapid and permanent soil organic matter losses and often results in permanent recompaction and land degradation or anthropic savannization; thus, it should be avoided. Unlike in other regions, like southeast Brazil, saturating the soil solely with inorganic potassium and nitrogen soluble fertilizers is not recommended. Nutrient retention in the root zone can be enhanced if nutrients are added in a slow-release form and if biologically mediated processes are used for nutrient release, as occurs in green manure. Therefore, an alternative that favors using local resources to increase the supply of nutrients and offset processes that impair the efficiency of nutrient use must be pursued. View Full-Text
Keywords: mulching; organic matter; soil indicators; soil management; sustainability mulching; organic matter; soil indicators; soil management; sustainability

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Moura, E.G.; Gehring, C.; Braun, H.; Ferraz Junior, A.S.L.; Reis, F.O.; Aguiar, A.C.F. Improving Farming Practices for Sustainable Soil Use in the Humid Tropics and Rainforest Ecosystem Health. Sustainability 2016, 8, 841.

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