Gamma-ray attenuation method as an efficient tool to investigate soil bulk density spatial variability

2009 ◽  
Vol 36 (11-12) ◽  
pp. 1734-1739 ◽  
Author(s):  
L.F. Pires ◽  
J.A. Rosa ◽  
A.B. Pereira ◽  
R.C.J. Arthur ◽  
O.O.S. Bacchi
Keyword(s):  
Spatial Variability ◽  
Bulk Density ◽  
Gamma Ray ◽  
Soil Bulk Density ◽  
Efficient Tool ◽  
Gamma Ray Attenuation

scholarly journals Gamma-Ray Attenuation to Evaluate Soil Porosity: An Analysis of Methods

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Luiz F. Pires ◽  
André B. Pereira
Keyword(s):  
Gamma Ray ◽  
Particle Density ◽  
Pore Space ◽  
Physical Property ◽  
Soil Bulk Density ◽  
Soil Porosity ◽  
Porous System ◽  
Soil Pore Space ◽  
Gamma Ray Attenuation ◽  
Dry Soil

Soil porosity (ϕ) is of a great deal for environmental studies due to the fact that water infiltrates and suffers redistribution in the soil pore space. Many physical and biochemical processes related to environmental quality occur in the soil porous system. Representative determinations ofϕare necessary due to the importance of this physical property in several fields of natural sciences. In the current work, two methods to evaluateϕwere analyzed by means of gamma-ray attenuation technique. The first method uses the soil attenuation approach through dry soil and saturated samples, whereas the second one utilizes the same approach but taking into account dry soil samples to assess soil bulk density and soil particle density to determineϕ. The results obtained point out a good correlation between both methods. However, whenϕis obtained through soil water content at saturation and a 4 mm collimator is used to collimate the gamma-ray beam the first method also shows good correlations with the traditional one.

DEVELOPMENT OF COMPACTION PATTERNS DUE TO MACHINERY OPERATION IN AN ORCHARD SOIL

1976 ◽  
Vol 56 (3) ◽  
pp. 505-509 ◽  
Author(s):  
G. S. V. RAGHAVAN ◽  
E. MCKYES ◽  
M. CHASSÉ ◽  
F. MÉRINEAU
Keyword(s):  
Bulk Density ◽  
Gamma Ray ◽  
Soil Bulk Density ◽  
Soil Conditions ◽  
Soil Density ◽  
Compaction Test ◽  
Orchard Soil ◽  
Ray Density

A series of tests was performed in a field, freshly prepared and ready for the planting of new trees, to study the pattern of soil density changes under different loads, soil conditions, tire sizes and numbers of passes using a gamma-ray density meter. The change in soil bulk density varied from 0.08 g/cc to 0.48 g/cc for increasing numbers of traverses of tractor and sprayer. The soil bulk density achieved after 15 passes with a tractor and sprayer approximated both the maximum bulk density obtained with a standard Proctor compaction test and the maximum bulk density that has been observed in adjacent orchards that are 30–40 yr old.

Sign in / Sign up

Export Citation Format

Share Document