Dear colleagues,
For your information there is a smoking fresh review paper on vis-NIR
spectroscopy in soil science in Advances in Agronomy (for a little
while longer only electronically; abstract last in this mail):
Stenberg, B., Viscarra Rossel, R.A., Mouazen, A.M. and Wetterlind, J.,
2010. Visible and Near Infrared Spectroscopy in Soil Science. In: L.S.
Donald (Editor), Advances in Agronomy. Academic Press, pp. 163-215.
It can be downloaded as a pdf-file from Science Direct vi doi:
http://dx.doi.org/10.1016/S0065-2113(10)07005-7
or directly (in one line) from:
http://198.81.200.2/science?_ob=ArticleURL&_udi=B7CSX-50HVVP2-9&_user=651610&_coverDate=12%2F31%2F2010&_rdoc=9&_fmt=high&_orig=browse&_srch=doc-info(%23toc%2318034%232010%23998929999%232211786%23FLA%23display%23Volume)&_cdi=18034&_sort=d&_docanchor=&_ct=10&_acct=C000035238&_version=1&_urlVersion=0&_userid=651610&md5=76fb4129136b4e6f439786e00b6b94f8#aff2
If you don't get access to the pdf send me an e-mail and I'll mail you
a copy.
Best whishes
Bo Stenberg
bo.st...@mark.slu.se
ABSTRACT
This chapter provides a review on the state of soil visible-near
infrared (vis-NIR) spectroscopy. Our intention is for the review to
serve as a source of up-to-date information on the past and current
role of vis-NIR spectroscopy in soil science. It should also provide
critical discussion on issues surrounding the use of vis-NIR for soil
analysis and on future directions. To this end, we describe the
fundamentals of visible and infrared diffuse reflectance spectroscopy
and spectroscopic multivariate calibrations. A review of the past and
current role of vis-NIR spectroscopy in soil analysis is provided,
focusing on important soil attributes such as soil organic matter
(SOM), minerals, texture, nutrients, water, pH, and heavy metals. We
then discuss the performance and generalization capacity of vis-NIR
calibrations, with particular attention on sample pretratments,
covariations in data sets, and mathematical data preprocessing. Field
analyses and strategies for the practical use of vis-NIR are
considered. We conclude that the technique is useful to measure soil
water and mineral composition and to derive robust calibrations for
SOM and clay content. Many studies show that we also can predict
properties such as pH and nutrients, although their robustness may be
questioned. For future work we recommend that research should focus
on: (i) moving forward with more theoretical calibrations, (ii) better
understanding of the complexity of soil and the physical basis for
soil reflection, and (iii) applications and the use of spectra for
soil mapping and monitoring, and for making inferences about soils
quality, fertility and function. To do this, research in soil
spectroscopy needs to be more collaborative and strategic. The
development of the Global Soil Spectral Library might be a step in the
right direction.