2012
DOI: 10.1590/s0100-06832012000300007
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Variabilidade espacial da resistência mecânica à penetração em vertissolo cultivado com manga no perímetro irrigado de Mandacaru, Juazeiro, Bahia, Brasil

Abstract: Variabilidade espacial da resistência Mecânica à penetração eM Vertissolo...

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Cited by 17 publications
(26 citation statements)
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References 9 publications
(3 reference statements)
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“…Moreover, we observed that the values of the RP layers 0.10-0.20m, 0.20-0.30m and 0.30-0.40m were higher than 2.0 MPa, reaching specific values higher than 6.5 MPa at certain depths (Table 2). COELHO et al (2012) found lower values of RP in area cultivated with mango for 15 years, in Haplic Vertisol, with moisture values similar to this study, indicating that the occurrence of RP is due to the management used and not to the time of cultivation in the area, confirmed also by ROBOREDO et al (2010) for Red Latosol. Using the classification proposed by WARRICK & NIELSEN (1980), in relation to the coefficient of variation (CV) of the evaluated soil layers, only layer of 0.00-0.10m showed high CV (CV > 62%), and the others showed CV considered medium (12% < CV < 62%).…”
Section: Resultssupporting
confidence: 88%
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“…Moreover, we observed that the values of the RP layers 0.10-0.20m, 0.20-0.30m and 0.30-0.40m were higher than 2.0 MPa, reaching specific values higher than 6.5 MPa at certain depths (Table 2). COELHO et al (2012) found lower values of RP in area cultivated with mango for 15 years, in Haplic Vertisol, with moisture values similar to this study, indicating that the occurrence of RP is due to the management used and not to the time of cultivation in the area, confirmed also by ROBOREDO et al (2010) for Red Latosol. Using the classification proposed by WARRICK & NIELSEN (1980), in relation to the coefficient of variation (CV) of the evaluated soil layers, only layer of 0.00-0.10m showed high CV (CV > 62%), and the others showed CV considered medium (12% < CV < 62%).…”
Section: Resultssupporting
confidence: 88%
“…The electronic penetrometers can be coupled to mobile sampling unit, like a system assembled on a quadricycle (AGUIAR et al, 2009), or be pulled and connected to the hydraulic system of a tractor (BONNIN et al, 2010). Penetrometers can also be used manually, being of springs (MEDEIROS et al, 2010), electronic (COELHO et al, 2012) or of impact.…”
Section: Introductionmentioning
confidence: 99%
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“…Dessa forma, pode-se observar que a distribuição dos atributos no espaço não é aleatória, uma vez que todos apresentaram valores moderados ou fortes para o grau de dependência espacial. Coelho et al (2012) encontraram forte dependência espacial da RP nas camadas de 0,00-0,10; 0,10-0,20 e 0,20-0,30 m, ao avaliarem a variabilidade dos atributos físicos de solo cultivado com manga. Em Cambissolo Háplico Alítico cultivado com mandioca, nas camadas de 0,00-0,15 e 0,15-0,30 m, Campos et al (2012), ao avaliarem a umidade do solo, observaram fraca e moderada dependência espacial nas respectivas camadas.…”
Section: Resultsunclassified
“…A resistência à penetração de raízes constitui uma das variáveis mais consideradas na mensuração da compactação do solo (Bottega et al, 2011;Dalchiavon et al, 2011;Mion et al, 2012 No entanto, tão importante quanto à quantificação das propriedades físicas do solo, é a determinação da variabilidade espacial dessas propriedades em campo (Bottega et al, 2011;Coelho et al, 2012). O conhecimento da variabilidade das propriedades do solo no espaço e no tempo é considerado o princípio básico para o manejo preciso em áreas agrícolas de qualquer escala (Grego & Vieira, 2005).…”
Section: Introductionunclassified