2002
DOI: 10.1590/s0103-84782002000600008
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Abstract: RESUMO Os corretivos e fertilizantes, quando aplicados de forma localizada, mantêm-se ao longo das linhas de cultivo no sistema plantio direto. Isto se reflete no aumento da variabilidade horizontal dos atributos químicos do solo, causando dificuldades para a coleta de

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Cited by 14 publications
(15 citation statements)
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“…Para Schilindwein e Anghinoni (2002), o número de amostras deve contemplar as macrovariações (> 2 m), enquanto a forma, o volume (área da amostra) e o local de amostragem devem contemplar as meso (5 cm a 2 m) e as microvariações (< 5cm). Esses autores compararam teores de P e K disponíveis, determinados ao se coletar amostras simples de diferentes volumes (áreas diferentes para uma mesma profundidade) e observaram que os coef icientes de variação (CV) dos teores de P e K diminuíram com o aumento da área das amostras simples, independentemente da forma da seção (retangular ou quadrada).…”
Section: Forma Da Amostra Simples De Solounclassified
“…Para Schilindwein e Anghinoni (2002), o número de amostras deve contemplar as macrovariações (> 2 m), enquanto a forma, o volume (área da amostra) e o local de amostragem devem contemplar as meso (5 cm a 2 m) e as microvariações (< 5cm). Esses autores compararam teores de P e K disponíveis, determinados ao se coletar amostras simples de diferentes volumes (áreas diferentes para uma mesma profundidade) e observaram que os coef icientes de variação (CV) dos teores de P e K diminuíram com o aumento da área das amostras simples, independentemente da forma da seção (retangular ou quadrada).…”
Section: Forma Da Amostra Simples De Solounclassified
“…Less mobile elements, such as P, in soils have greater horizontal and vertical variability in NT than CT due to the residual effect of fertilizers on the soil surface and in the plant row (Schlindwein and Anghinoni, 2002). An increase in surface P contents in soils in low-tillage systems (NT and RT) has been reported by other authors (Santos et al, 2008;Costa et al, 2009).…”
Section: Resultsmentioning
confidence: 99%
“…For example, Santos et al (2008) and Costa et al (2009) found results that support that no-tillage and reduced tillage systems are able to increase P and Ca 2+ contents. However, the vertical distribution of these chemical elements in the soil profile can be affected by the use of low disturbance systems (Schlindwein and Anghinoni, 2002). This is especially important for elements that have low mobility in soils, which are generally maintained on the surface, and it can be associated with processes and properties such as specific adsorption and the preference of cations with high ionic strength for adsorption sites.…”
Section: Introductionmentioning
confidence: 99%
“…Therefore, land leveling did not significantly change the variance values for the great majority of the data sets. According to Schlindwein & Anghinoni (2002), in the case of precision agriculture, an increase in the variance of a set of measurements implies an increase in the number of samples that need to be collected for a given probability level. Among the properties evaluated before leveling (Table 1), only the EC data did not follow normal distribution according to the Kolmogorov-Smirnov test (p<0.05), while after leveling, clay, silt, sand, Disp clay, Pd and WAD also did not follow normality, indicating that these properties showed a localized distribution in the experimental area (Grego et al, 2006), and the mean value cannot be considered the center of the distribution (Nielsen & Wendroth, 2003 Disp clay: dispersed clay, Bd: bulk density, Pd: particle density, Tp: total porosity, Macro: macroporosity, Micro: microporosity, WAD: weighted average diameter, AWC: available water capacity, EC: electrical conductivity.…”
Section: Resultsmentioning
confidence: 99%