Aplicação de adubo e corretivo após o corte da cana-planta utilizando técnicas geoestatísticas

Campos, Milton César Costa; Júnior, José Marques; Pereira, Gener Tadeu; Souza, Zigomar Menezes de; Barbieri, Diogo Mazza

doi:10.1590/s0103-84782008000400011

Cited by 9 publications

(8 citation statements)

References 13 publications

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“…Marked deviations from normal distribution were detected for K and particularly for P, which showed the highest (positive) values for kurtosis and asymmetry, associated with a wide range and very high levels of P in few samples (data not shown), conferring log-normal distribution to the data. Significant deviations from normality for P and K were also observed by Barbieri et al (2008), Campos et al (2008) andOliveira Junior et al (2010). Warrick & Nielsen (1980) classified the coefficients of variation (CV) for soil properties as low ( 12 %), medium (12 % < CV < 24 %), and high ( 24 %).…”

Section: Resultsmentioning

confidence: 99%

Variability of soil fertility properties in areas planted to sugarcane in the State of Goias, Brazil

Cardoso

Lacerda

Rein

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYSoil sampling should provide an accurate representation of a given area so that recommendations for amendments of soil acidity, fertilization and soil conservation may be drafted to increase yield and improve the use of inputs. The aim of this study was to evaluate the variability of soil fertility properties of Oxisols in areas planted to sugarcane in the State of Goias, Brazil. Two areas of approximately 8,100 m 2 each were selected, representing two fields of the Goiasa sugarcane mill in Goiatuba. The sugarcane crop had a row spacing of 1.5 m and subsamples were taken from 49 points in the row and 49 between the row with a Dutch auger at depths of 0.0-0.2 and 0.2-0.4 m, for a total of 196 subsamples for each area. The samples were individually subjected to chemical analyses of soil fertility (pH in CaCl 2 , potential acidity, organic matter, P, K, Ca and Mg) and particle size analysis. The number of subsamples required to compose a sample within the acceptable ranges of error of 5, 10, 20 and 40 % of each property were computed from the coefficients of variation and the Student t-value for 95 % confidence. The soil properties under analysis exhibited different variabilities: high (P and K), medium (potential acidity, Ca and Mg) and low (pH, organic matter and clay content). Most of the properties analyzed showed an error of less than 20 % for a group of 20 subsamples, except for P and K, which were capable of showing an error greater than 40 % around the mean. The extreme variability in phosphorus, particularly at the depth of 0.2-0.4 m, attributed to banded application of high rates of P fertilizers at planting, places limitations on assessment of its availability due to the high number of subsamples required for a composite sample.Index terms: Saccharum spp., soil sampling, soil analysis, spatial distribution. RESUMO: VARIABILIDADE DE ATRIBUTOS DE FERTILIDADE DO SOLO EM ÁREAS CULTIVADAS COM CANA-DE-AÇÚCAR NO ESTADO DE GOIÁSA amostragem de solo deve representar adequadamente a área avaliada, visando à elaboração de recomendações de medidas de correção da fertilidade e conservação dos solos, a fim de elevar a produtividade e melhorar o aproveitamento de insumos. O objetivo deste trabalho foi avaliar a variabilidade de atributos de fertilidade de Latossolos em áreas de renovação de cana-de-açúcar no Estado de Goiás. Foram selecionadas duas áreas de aproximadamente 8.100 m 2 na usina Goiasa, município de Goiatuba, consideradas representativas de dois talhões cultivados com cana-de-açúcar, com espaçamento entrelinhas de 1,5 m. Em cada uma das áreas selecionadas, foi realizada amostragem do solo em malha, nas linhas de plantio e nas entrelinhas, com trado holandês. Coletaram-se amostras simples (subamostras) em 49 pontos amostrais nas linhas e 49 nas entrelinhas, nas profundidades de 0,0-0,2 e 0,2-0,4 m, totalizando 196 amostras simples em cada área de estudo, que foram analisadas individualmente. As amostras foram submetidas a análises químicas de fertilidade do solo (pH em CaCl 2 , acidez potencial, mat...

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Section: Resultsmentioning

confidence: 99%

Variability of soil fertility properties in areas planted to sugarcane in the State of Goias, Brazil

Cardoso

Lacerda

Rein

et al. 2014

Rev. Bras. Ciênc. Solo

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“…According to CAMPOS et al (2008), the reach indicates the limit of the spatial dependency of the variable, i.e., measurements performed at distances greater than the extent has a random spatial distribution, and therefore is independent of each other. Moreover, measurements performed at distances smaller than the range are correlated with each other, which allow us to make interpolations for spacing smaller than the sampled.…”

Section: Resultsmentioning

confidence: 99%

Spatial variability of soil physical properties in two management systems in sugarcane crop

et al. 2012

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ABSTRACT:The aim of this study was to characterize the spatial variability of soil bulk density (Bd), soil moisture content (θ) and total porosity (Tp) in two management systems of sugarcane harvesting, with or without burning, in a Haplustox soil, in the 0-0.20 m layer. The study area is located in Rio Brilhante, state of Mato Grosso do Sul, Brazil, in Eldorado Sugar Mill. The plots have presented 180 m length, and 145.6 m width, totaling 90 points distributed in the form of a grid of nine rows by ten columns, with points spaced 20 m from its neighbor. Soil samples were collected at 0-0.20 m layer in 2007/2008 and 2008/2009 crops. The harvest with burning system had a higher density compared to mechanized harvest, in the two study periods. The moisture content as well as the porosity increased proportionally with the decrease of the density of the harvest burning system compared to the mechanized. KEYWORDS: mechanized harvesting, bulk density, Saccharum spp. VARIABILIDADE ESPACIAL DAS PROPRIEDADES FÍSICAS DO SOLO EM DOIS

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“…De acordo com Campos et al (2008), o alcance indica o limite da dependência espacial da variável, isto é, determinações realizadas a distâncias maiores que o alcance, têm tem distribuição espacial aleatória e, por isso mesmo, são independentes entre si; por outro lado, determinações realizadas em distâncias menores que o alcance são correlacionadas umas às outras, o que permite que se façam interpolações para espaçamentos menores que os amostrados.…”

Section: Resultsunclassified

Dependência espacial dos atributos físicos de três classes de solos cultivados com cana-de-açúcar sob colheita mecanizada

Carvalho

Meurer²,

Silva³

et al. 2011

Rev. bras. eng. agríc. ambient.

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R ESU M OObjetivou-se, neste trabalho, avaliar as propriedades físicas de três classes de solo cultivadas com cana-deaçúcar em sistema de colheita mecanizada na região de Mato Grosso do Sul. O local de estudo pertence à Usina Eldorado, Grupo ETH Bioenergia S/A, localizada no município de Rio Brilhante, MS. A amostragem em cada área experimental foi realizada a partir de uma malha, com 180 m de comprimento e 145,6 m de largura, totalizando 90 pontos em forma de grade, com 9 colunas e 10 linhas, onde foram coletadas amostras de estrutura indeformada nas camadas de 0-0,2 m e 0,2-0,4 m de profundidade nas entrelinhas da cultura. Após coleta, as amostras foram processadas para determinação da densidade do solo (DS), porosidade total (PT) e umidade do solo () para interpretação dos dados. A palhada deixada sobre superfície auxiliou na mantença de bom nível de matéria orgânica, corroborando na formação, agregação e estabilidade de poros, impedindo o aumento da densidade. A redução da porosidade total e consecutivo aumento na densidade do solo, principalmente na profundidade de 0,2-0,4 m, indicam compactação nesta camada, justificada pelo intenso tráfego de veículos e ausência de revolvimento do solo. Palavras-chave:Saccharum officinarum, densidade do solo, geoestatística, estabilidade de agregados Physical properties of three classes of soils cultivated with sugarcane in mechanized harvesting A B ST R A C T The aim of this study was to evaluate the physical properties of three soils cultivated with sugarcane mechanized harvest system in the region of Mato Grosso do Sul The study site belongs to the Plant Eldorado, ETH Bioenergy Group S/A, located in Rio Brilhante, MS. The sampling in each experimental area was made from a grid with 180 m long and 145.6 m wide, totaling 90 points in a grid form, with nine columns and 10 rows, where samples were collected in undisturbed layers of 0-0.2 m and 0.2-0.4 m deep in the rows. After collection, samples were processed for determination of soil bulk density (BD), total porosity (TP) and soil moisture () for data interpretation. Crop residues left on surface helped to maintain good level of organic matter, supporting the formation, aggregation and stability of pores, preventing the increase in density. The reduction in total porosity and consecutive increase in density, especially in the 0.2-0.4 m, indicating compaction of this layer, justified by the intense traffic of vehicles and lack of soil disturbance.

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Aplicação de adubo e corretivo após o corte da cana-planta utilizando técnicas geoestatísticas

Abstract: RESUMO O conhecimento da variação espacial de atributos do solo pode contribuir para o planejamento e a otimização

Cited by 9 publications

References 13 publications

Variability of soil fertility properties in areas planted to sugarcane in the State of Goias, Brazil

Variability of soil fertility properties in areas planted to sugarcane in the State of Goias, Brazil

Spatial variability of soil physical properties in two management systems in sugarcane crop

Dependência espacial dos atributos físicos de três classes de solos cultivados com cana-de-açúcar sob colheita mecanizada

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