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Diffuse Reflectance Spectroscopic Approach for the Characterization of Soil Aggregate Size Distribution

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Title Diffuse Reflectance Spectroscopic Approach for the Characterization of Soil Aggregate Size Distribution
 
Creator Sarathjith, MC
 
Contributor Das, Bhabani Sankar
Vasava, Hitesh B.
Mohanty, Biswajita
Sahadevan, Anand S.
Wani, Suhas
Sahrawat, Kanwar Lal
 
Subject soil aggregation
drs
 
Description Assessment of soil structure and soil aggregation remains a challenging task.
Routine methods such as dry- and wet-sieving approaches are generally time
consuming and tedious, which calls for a robust, fast, and nondestructive
method of soil aggregate characterization. Over the last two decades, diffuse
reflectance spectroscopy (DRS) has emerged as a rapid and noninvasive technique
for soil characterization. Combined with chemometric and data-mining
algorithms, it provides an effective way of measuring several soil attributes
and has the added advantage of being amenable to a remote sensing mode of
operation. The objective of this study was to determine if the DRS approach
could be used as a rapid, noninvasive technique to estimate soil aggregate
characteristics. The DRS approach was examined for the estimation of soil
aggregate characteristics such as the geometric mean diameter and two
statistical parameters of the lognormal aggregate size distribution (ASD)
functions using 910 soil samples from India representing three important soil
groups. Results showed that the geometric mean diameter and the median
aggregate size parameter provided excellent predictions, with ratio of performance
deviation (RPD) values ranging from 1.99 to 2.28. The RPD value
for the standard deviation of the ASD ranged from 1.36 to 1.72, suggesting
moderate prediction. It was further observed that soil aggregates influence
the incident electromagnetic radiation on soils primarily in the visible region
and to some extent the shortwave- and near-infrared regions. Electronic transitions
of Fe-bearing minerals, clay minerals, and C–H functional groups of
organic matter may be responsible for modifying the spectral reflectance
from soils in addition to the self-shadowing effects of surface roughness. The
results of this study suggest that the chemometric approach may be combined
with DRS to estimate soil aggregate size characteristics.
 
Date 2014-03-28
2017-01-05T19:44:25Z
2017-01-05T19:44:25Z
 
Type Journal Article
 
Identifier http://oar.icrisat.org/id/eprint/8403
https://mel.cgiar.org/reporting/download/hash/dzCFYOIn
MC Sarathjith, Bhabani Sankar Das, Hitesh B. Vasava, Biswajita Mohanty, Anand S. Sahadevan, Suhas Wani, Kanwar Lal Sahrawat. (28/3/2014). Diffuse Reflectance Spectroscopic Approach for the Characterization of Soil Aggregate Size Distribution. Soil Science Society of America Journal, 78(2).
https://hdl.handle.net/20.500.11766/5353
Limited access
 
Language en
 
Rights CC-BY-NC-4.0
 
Format PDF
 
Publisher Soil Science Society of America
 
Source Soil Science Society of America Journal;78,(2014)