Variabilidade espacial da resistência mecânica do solo à penetração e umidade do solo em área cultivada com cana-de-açúcar na região de Humaitá, Amazonas, Brasil

Campos, Milton César Costa; Aquino, Renato Eleotério de; Oliveira, Ivanildo Amorim de; Bergamim, Anderson Cristian

doi:10.5039/agraria.v8i2a2091

Cited by 20 publications

(18 citation statements)

References 26 publications

(26 reference statements)

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“…The decrease of ρ b , MWD and OC in pasture was also observed in Alho et al (2016) articles. Campos et al (2013b) reported low variability for aggregates > 2.00 mm in Red Argisol, while Aquino et al (2015) found low and medium variability for aggregates < 2.00 mm when the depth increased. We observed a spatial dependence between depth and land use in most of the studied attributes (Table 3).…”

Section: Resultsmentioning

confidence: 95%

Spatial variability of aggregates and organic carbon under three different uses of indian black earth in southern Amazonas

Gomes¹,

Campos²,

Soares³

et al. 2017

Biosci. J.

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Indian Black Earths (IBEs) are distributed throughout the Amazon. They are characterized by their high chemical fertility and agricultural potential. IBEs have high organic carbon, favouring the improvement of soil structure. This work aimed to evaluate the aggregates and organic carbon (OC) spatial variability in different IBEs in southern Amazonas. We evaluated the organic carbon spatial variability, mean weight diameter (MWD), soil bulk density (ρ b ) and aggregate classes under three uses of soil: pasture, cocoa, and coffee. We collected 528 soil samples in a point grid according to its use at two depths: 0.0-0.05 m and 0.10-0.20 m. Results were subjected to variance, descriptive, and geostatistical analyses. We concluded that the soil use influenced the IBEs physical attributes soil behavior, concentrating the higher values of CO, aggregates > 2.00 mm, and MWD at 0.0-0.05 m in relation to ρ b and aggregates < 2.00 mm where the higher values were the ones at 0.10-0.20 m. Aggregates < 2.00 mm (0.10-0.20 m) and OC (0.0-0.05 m) did not show spatial dependence, while the class of aggregates > 2.00 mm was the only attribute which represented to be a natural characteristic of the soil, with a strong spatial dependence, independently the land use and depth. There was no spatial relationship between the attributes studied and the geomorphic diversity.

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Section: Resultsmentioning

confidence: 95%

Spatial variability of aggregates and organic carbon under three different uses of indian black earth in southern Amazonas

Gomes¹,

Campos²,

Soares³

et al. 2017

Biosci. J.

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“…For this purpose, geostatistical techniques are used to study the spatial variability of soil and plant properties (Zanão Júnior et al, 2007;Marins et al, 2008;Vieira et al, 2011;Campos et al, 2012Campos et al, , 2013Camargo et al, 2013;Bottega et al, 2013). However, these techniques require a previous sample design with the exact spatial position of each sample point (Montanari et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Use of Scaled Semivariograms in the Planning Sample of Soil Physical Properties in Southern Amazonas, Brazil

Aquino¹,

Campos

Marques³

et al. 2015

Rev. Bras. Ciênc. Solo

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There is a great lack of information from soil surveys in the southern part of the State of Amazonas, Brazil. The use of tools such as geostatistics may improve environmental planning, use and management. In this study, we aimed to use scaled semivariograms in sample design of soil physical properties of some environments in Amazonas. We selected five areas located in the south of the state of Amazonas, Brazil, with varied soil uses, such as forest, archaeological dark earth (ADE), pasture, sugarcane cropping, and agroforestry. Regular mesh grids were set up in these areas with 64 sample points spaced at 10 m from each other. At these points, we determined the particle size composition, soil resistance to penetration, moisture, soil bulk density and particle density, macroporosity, microporosity, total porosity, and aggregate stability in water at a depth of 0.00-0.20 m. Descriptive and geostatistical analyses were performed. The sample density requirements were lower in the pasture area but higher in the forest. We concluded that managed-environments had differences in their soil physical properties compared to the natural forest; notably, the soil in the ADE environment is physically improved in relation to the others. The physical properties evaluated showed a structure of spatial dependence with a slight variability of the forest compared to the others. The use of the range parameter of the semivariogram analysis proved to be effective in determining an ideal sample density.

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“…Além disso, observa-se que a alta compactação predomina no campo, diferentemente do observado em cada camada. Os resultados deste trabalho são bem superiores aos obtidos por Campos et al (2013), que avaliaram a variabilidade espacial da RSP e do teor de água do solo em área cultivada com cana-de-açúcar e encontraram 2,86 MPa como o maior valor de RSP, que ocorreu na profundidade de 0,15-0,30 m.…”

Section: Resultsunclassified

“…Para isso, foi empregada a interpolação por krigagem, do mesmo modo que em Campos et al (2013). Esse procedimento, segundo Camargo (1998), considera uma superfície sobre a qual se observa alguma propriedade do solo, Z, em n pontos distintos, com coordenadas representadas pelo vetor x. Assim, tem-se um conjunto de valores {z(xi), i=1, ..., n}, em que xi identifica uma posição em duas dimensões, representada pelos pares de coordenadas (xi, yi).…”

Section: Methodsunclassified

Compactação de solo cultivado com cana-de-açúcar em Baía Formosa, Rio Grande do Norte

et al. 2016

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Soil compaction in a sugarcane field at Baía Formosa, Rio Grande do Norte, BrazilSoil compaction is one of the main constraints imposed to growth of sugar cane root system, with consequences as reduction on plant ability to absorb water and nutrients. In this context, this study had as objective to identify regions in the field with different compaction levels, allowing the adoption of site specific management. The work was carried out at the Green Valley Sugarcane Mill, in Baía Formosa, RN, Brazil. Soil penetration resistance (RSP) was used as indicative parameter of soil compaction, and was assessed in an area of 113.59 ha, divided in 12 sugarcane fields, where 113 georeferenced points were located. Determinations were made in the 0-10, 11-20, 21-30 and 31-40 cm depths, by means of a soil penetrometer with automatic data acquisition system. Data were analyzed through descriptive statistics and geostatistical tools, which were used for evaluating spatial dependence of variables and draw contour maps, after kriging interpolation. Contour maps show regions in the area with different soil compaction levels. Subsoiling may be avoided in 18.80% of the total area, mainly in the fields 45 and 48. In other regions subsoiling must be performed deeper than 40 cm.

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Variabilidade espacial da resistência mecânica do solo à penetração e umidade do solo em área cultivada com cana-de-açúcar na região de Humaitá, Amazonas, Brasil

Cited by 20 publications

References 26 publications

Spatial variability of aggregates and organic carbon under three different uses of indian black earth in southern Amazonas

Spatial variability of aggregates and organic carbon under three different uses of indian black earth in southern Amazonas

Use of Scaled Semivariograms in the Planning Sample of Soil Physical Properties in Southern Amazonas, Brazil

Compactação de solo cultivado com cana-de-açúcar em Baía Formosa, Rio Grande do Norte

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