Planejamento amostral da pressão de preconsolidação de um latossolo vermelho distroférrico

Abstract

RESUMO

Sampling Design of Soil Physical Properties in a Conilon Coffee Field

“…Spatial variation may occur even within homogeneous areas and across short distances, influencing the yield of Conilon coffee (Oliveira et al, 2009). In this respect, Gontijo et al (2007) emphasize that during the traditional sampling process, sub-samples may end up being collected next to each other, thus duplicating information on the values attributed to the soil. Therefore, knowledge regarding the continuity of the spatial distribution between sub-samples, represented by the range, will allow the construction of independent datasets, enabling the use of classical statistics without restrictions.…”

“…In the case of descriptive statistics, which does not consider spatial dependence between sub-samples of a determined soil property, an excessive quantity of sub-samples may be collected in order to attain a desired precision. Therefore, knowledge of soil spatial variability by means of geostatistical methods is essential for guiding the sampling process, thus avoiding non-representative sampling (Gontijo et al, 2007).…”

Novo índice geoestatístico para a mensuração da dependência espacial

“…A literatura apresenta que os índices propostos por Biondi et al (1994) e Cambardella et al (1994 são muito utilizados na área da Ciência do Solo (Grego et al, 2006;Simões et al, 2006;Boruvka et al, 2007;Duffera et al, 2007;Gallardo & Paramá, 2007;Gontijo et al, 2007;Vieira et al, 2009;Guedes Filho et al, 2010;Sampaio et al, 2010;Silva et al, 2010;Siqueira et al, 2010;Alvarenga et al, 2011;Ávila et al, 2011;Miqueloni & Bueno, 2011;Oliveira Júnior et al, 2011;Skorupa et al, 2012). Esses trabalhos são uma amostragem da, já extensa, gama de pesquisas sobre variabilidade espacial em solos e demonstram a importância de se terem medidas para possibilitar a descrição da estrutura de dependência espacial.…”

Spatial patterns of preconsolidation pressure and soil moisture along transects in two directions under coffee

“…Geostatistical methods have received considerable attention in agricultural sciences in recent years and have been applied to quantify the spatial variability of different soil properties. Geostatistical analyses have been used to estimate spatial variability of soil compaction (Utset & Cid, 2001;Ferrero et al, 2005;Gontijo et al, 2007), bulk density (Ferrero et al, 2005;Alletto & Coquet, 2009) and soil water content (Libardi et al, 1996;Nebel et al, 2010). A better knowledge of the variability patterns of the preconsolidation pressure and its causes is needed to improve soil sampling methods for this soil property and to improve traffic planning in the area.…”