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Semina: Ciências Agrárias
Article . 2012
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Spatial variability of total porosity, moisture and soil resistance to penetration of a yellow ultisol Variabilidade espacial da porosidade total, umidade e resistência do solo à penetração de um Argissolo amarelo

Authors: Renildo Luiz Mion; Elivânia Maria Sousa Nascimento; Francisco Alexandre de Lima Sales; Silvia Ferreira da Silva; José Moacir Lima Duarte; Beatriz Marques de Sousa;

Spatial variability of total porosity, moisture and soil resistance to penetration of a yellow ultisol Variabilidade espacial da porosidade total, umidade e resistência do solo à penetração de um Argissolo amarelo

Abstract

The study of spatial variability of soil attributes is important in areas under different uses and management. The moisture and soil resistance to penetration are considered an indicative parameter of soil physical quality. The objective of this work to study the spatial variability of total porosity, soil resistance to penetration and moisture in an area of rotational grazing sheep. The experiment was conducted in a Yellow Ultisol with a sandy texture in the layers of 0- 0.1, 0.1-0.2 and 0.2-0.3 m. For the determination of properties and soil resistance to penetration was defined a grid, with regular intervals of 30 m, total of 13 points. The total porosity (TP) and the gravimetric soil moisture (SU) were obtained by collecting undisturbed samples (Uhland soil sampler) and disturbed samples, respectively. The soil resistance to penetration (PR) was determined at each point using an electronic georeferenced penetrometer. The results showed that TP had a low variation coefficient in all studied layers. The SU in all evaluated layers and the PR in layers 0-0.1 and 0.1-0.2 m showed a medium variation coefficient. The PR in layer 0.2-0.3 m showed a high variation coefficient showing the average distribution with a high heterogeneity in the data. The attributes TP, PR and SU showed a weak spatial dependency index (SDI) in all evaluated layers. The PR increases as the TP and the SU has a smaller influence on the soil. O estudo da variabilidade espacial de atributos do solo é importante em áreas sob diferentes usos e manejos. A umidade e a resistência do solo à penetração são consideradas um parâmetro indicativo da qualidade física do solo. Objetivou-se com este trabalho estudar a variabilidade espacial da porosidade total, resistência do solo à penetração e da umidade em uma área de pastejo rotacionado de ovinos. O experimento foi conduzido em um Argissolo Amarelo de textura arenosa nas camadas de 0-0,1, 0,1-0,2 e 0,2-0,3m. Para a determinação dos atributos e resistência do solo à penetração foi delimitada uma malha, com intervalos regulares de 30 m, perfazendo um total de 13 pontos. A porosidade total (PT) e a umidade gravimétrica foram obtidas através das coletas de amostras indeformadas (amostrador do tipo Uhland) e deformadas, respectivamente. A resistência do solo à penetração (RP) foi determinada em cada ponto, utilizando um penetrômetro eletrônico georreferenciado. Os resultados mostraram que a PT apresentou um coeficiente de variação baixo em todas as camadas estudadas. A US em todas as camadas avaliadas e a RP nas camadas de 0-0,1 e 0,1-0,2m apresentaram um coeficiente de variação médio. A RP na camada de 0,2-0,3m apresentou um coeficiente de variação alto mostrando uma distribuição com alta heterogeneidade nos dados. Os atributos PT, RP e US apresentaram um índice de dependência espacial (IDE) fraco em todas as camadas avaliadas. A RP aumenta à medida que a PT e a US exerce uma menor influência sobre o solo.

Keywords

Penetrógrafo., Índice de cone, Agriculture (General), Geoestatística, S1-972

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
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