Integrated Systems of Agricultural Production in the North of Mato Grosso and the Physical Properties of Soil

Magalhães, Wellington de Azambuja; Freddi, Onã da Silva; Amorim, Ricardo Santos Silva; Marchioro, Vinicius; Raimo, Luis Di Loreto Di Augusto; Wruck, F. J.

doi:10.31413/nativa.v6i0.6103

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…In some of those no‐tillage systems, as the work of Magalhães et al. (2018) and Moreira et al. (2018), furrows were opened to plant the forestry trees, and thereafter, no more tillage was performed.…”

Section: Resultsmentioning

confidence: 99%

“…It is important to note that the term ‘porosity’ was used to group several soil porosity assessments, mostly related to analytical assessments performed in soil cores, such as macroporosity, microporosity and total porosity (Table S1). Other studies relating soil porosity included aeration capacity (Assis et al., 2015; Fidalski et al., 2013; Moreira et al., 2012; Spliethoff & Pott, 2018), cryptoporosity (Magalhães et al., 2018) and shape of pores (Reis et al., 2019). The work of Reis et al.…”

Section: Resultsmentioning

confidence: 99%

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Soil quality assessments in integrated crop–livestock–forest systems: A review

Valani

Martíni

Silva

et al. 2020

Soil Use and Management

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Integrated crop–livestock–forest is a promising strategy to improve soil quality. It comprises four different integrated farming systems: crop–livestock, crop–forest, forest–livestock and crop–livestock–forest. This work systematically reviewed studies about integrated crop–livestock–forest systems and soil quality. A total of 92 papers were retrieved from the Web of Science—Clarivate Analytics platform, and the following information was analysed: publication year, institution, region of the studied site, type of integrated system, soil type, tillage system, maximum soil depth and the soil quality indicators assessed. Most studies were published in the second half of the 2010s. Brazil is a prominent focus of research about soil quality and integrated crop–livestock–forest systems, with significant contribution from its central and southern regions. The Embrapa was the main publishing institution, present in over one‐third of the studies. Crop–livestock was the most common integrated system, Ferralsols was the most common soil group, and most of the studied soils were clayey. No tillage was the main tillage system. Most studies focused on the topsoil, assessing physical and/or chemical soil quality indicators. More emphasis on biological indicators of soil quality is required, as well as assessments integrating biological, physical and chemical indicators of soil quality. Future works should compare different integrated systems, including assessments deeper in the soil profile, especially in systems with the forest component, and also in sandy and silty soils. Soil quality indicators that have been rarely used should be further tested. Novel indicators should be added to better understand the promotion of soil quality by integrated crop–livestock–forest systems.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Soil quality assessments in integrated crop–livestock–forest systems: A review

Valani

Martíni

Silva

et al. 2020

Soil Use and Management

View full text Add to dashboard Cite

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“…Figure 1 shows the palm's foliage, comprised of laminae, leaf sheaths, and the PMP, which consists of a firm outer layer (epidermis along the peripheral cortex) enclosing a porous cellular structure [5]. In comparison, BW (Ochroma pyramidale), Figure 2, is prevalent in Brazil's Amazon Region, but the world's largest producer is Ecuador [6,7]. Figure 2(c) shows the cross section of the BW trunk, which provides the BW used in WTBs.…”

Section: Introductionmentioning

confidence: 99%

The Petiole of the Miriti Palm: A sustainable material for wind turbine blades?

Gomes,

Vaz,

Wong

et al. 2024

J. Phys.: Conf. Ser.

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The Miriti Palm (Mauritia flexuosa) grows abundantly in the Amazon Region of Brazil. The petiole (PMP) that supports the leaves, has a density of about one-half of Balsa wood (BW), which is used in the manufacture of wind turbine blades. A further possible advantage of PMP is that harvesting does not kill the palm tree, in contrast to the harvesting of BW. Because the mechanical properties of PMP have not been measured, we determined the shear and tensile properties of 16 samples of PMP and BW to allow a preliminary assessment of PMP as a possible material for blades. The absolute shear and tensile strengths for BW are higher, but specific properties (normalized by the density) are similar and can favour PMP. Direct substitution of BW by PMP would reduce the weight of a typical large blade by around 2%.

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Using the petiole of the miriti palm for the core of a small wind turbine blade

Gomes,

Vaz,

Wood

2024

Journal of Renewable and Sustainable Energy

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In many small wind turbine blades, the interior space between laminate skins is filled by a material core. The mechanical properties of the core are much less important than its density, which must be low to reduce the moment of inertia as high inertia increases both the starting time of the turbine and the gyroscopic loads on the blades. In this paper, we use, for the first time, the petiole of the miriti palm (PMP) as the core of four small blades, in order to analyze its effect on turbine starting performance. PMP is abundant in the Amazon region and harvesting it does not destroy the palm because the petiole regrows; therefore, harvesting is fully sustainable and may well have a major role in increasing the sustainability on wind turbine manufacturing. We consider the benefits of using the easily worked petiole for the core in terms of manufacturing, as demonstrated by the construction of a 0.598 m blade. PMP is less dense on average than alternative materials, such as expanded polystyrene and balsa wood. The starting performance is an important issue for small wind turbines. It is evaluated using a quasi-steady model, in which blade element momentum theory is coupled to Newton's Second Law. The low density of the small blade made using petiole of the miriti reduces the starting time by 10% when compared with expanded polystyrene and 42% when compared to balsa wood.

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Integrated Systems of Agricultural Production in the North of Mato Grosso and the Physical Properties of Soil

Cited by 4 publications

References 27 publications

Soil quality assessments in integrated crop–livestock–forest systems: A review

Soil quality assessments in integrated crop–livestock–forest systems: A review

The Petiole of the Miriti Palm: A sustainable material for wind turbine blades?

Using the petiole of the miriti palm for the core of a small wind turbine blade

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