Impacto nos atributos do solo sob conversão de floresta para áreas cultivadas na região sul do Amazonas, Brasil

Enck, Bruna Firmino; Rodrigues, José Cunegundes Weckner; Hassane, Abdul Luís; Tembo, Reinato Andrade; Campos, Milton César Costa; Santos, Luís Antônio Coutrim dos; Brito, Wildson Benedito Mendes

doi:10.5902/2236499443591

Cited by 1 publication

(1 citation statement)

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“…The influences were in the following order: manipueira > distilled water. Soil tillage affects the total porosity; thus, our results suggest that the Argisol is at a more advanced degradation stage than the Latosol (Rocha et al, 2015;Enck et al, 2020). This is most likely due to the contribution of a thick layer of organic debris under the native forest condition from which the Latosol samples were collected.…”

Section: Centrifugation Resultsmentioning

confidence: 73%

Compactibility of cohesive soils from tablelands as influenced by cassava wastewater

et al. 2023

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Consolidation tests give important insights into soil compactibility. However, it requires equipment that is not always available. The costal tablelands in Northeastern Brazil have extensive areas of cohesive soils where compaction is an expressive problem. This region is a prominent producer of food and fibers with cassava as one of the leading products. Part of the cassava is used for flour production, generating wastewater, which is often applied as organic fertilizer to the soil. This can affect the compaction properties of soil due to its dispersing-flocculating characteristics. Uniaxial-compression tests and mathematical models are the primary methods to measure or estimate soil compaction. This study measured soil compression with a centrifuge, seeking a simple-quick method. We used specific loads (stainless-steel cylinders: mass) and increasing G-force (weight) to simulate the pressure on the samples used in most consolidation apparatus. Soils, sampling layers, and the presence of cassava wastewater (manipueira) were also compared since they may affect compactibility-related attributes. Samples of a Gray Cohesive Argisol and Dystrocohesive Yellow Latosol (depths of 0-0.20 m and 0.20-0.40 m) from the Tablelands of the state of Bahia, Brazil, were used. Wastewater affected water-dispersible clay, aggregate stability, pH, ∆pH, flocculation, and organic carbon, thus influencing compactibility but not the moisture and maximum density measured by the Proctor test. Centrifugation caused lower density than the Proctor test. The results were close to those estimated by the mathematical models, thus considered a promising alternative to estimating consolidation. This method also provides insight into the root growth-limiting density and the moisture content that leads to it.

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Section: Centrifugation Resultsmentioning

confidence: 73%