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Near infrared spectroscopy for within-field soil characterisation – Small local calibrations compared with national libraries spiked with local samples

Wetterlind, Johanna and Stenberg, Bo (2010). Near infrared spectroscopy for within-field soil characterisation – Small local calibrations compared with national libraries spiked with local samples. European journal of soil science. 61:6, 823-843
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Official URL: http://dx.doi.org/10.1111/j.1365-2389.2010.01283.x

Abstract

The advantage of using near infrared spectroscopy to increase sample point density in farm soil mapping relies on the number of conventional laboratory analyses for the calibrations being kept to a minimum. The objectives with the present study was to compare the performance of small farm scale calibrations (25 samples) to a larger national soil library (396 samples) and to test if a site specific sample set selected from the national library, consisting of the 50 samples spectrally most similar to those of the local sites could increase performance. In addition the national library and the selected subsets were augmented with up to the 25 local calibration samples to test whether that would have any additional effect on prediction errors and bias. Calibrations were made for predicting within-field variation in clay, silt, sand, soil organic carbon, pH and phosphorus. Selecting a subset of samples from the national library did not improve the results compared to using the entire national library. However, spiking both libraries with local samples reduced the RMSEP considerably, mainly due to a decrease in bias and often resulted in comparable results to the local calibrations. There was a tendency for better clay and SOC predictions when spiking a reduced national library compared to spiking the entire national library, sometimes even resulting in better predictions than using the local calibrations. However, using local calibrations seems to be the best alternative for predictions of soil parameters at the farm or filed scale, even with as few samples as 25.

Authors/Creators:Wetterlind, Johanna and Stenberg, Bo
Title:Near infrared spectroscopy for within-field soil characterisation – Small local calibrations compared with national libraries spiked with local samples
Series/Journal:European journal of soil science (1365-2389)
Year of publishing :December 2010
Volume:61
Number:6
Page range:823-843
Publisher:WILEY-BLACKWELL PUBLISHING, INC
ISSN:1365-2389
Language:English
Publication Type:Journal article
Refereed:Yes
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Agris subject categories.:P Natural resources > P30 Soil science and management
P Natural resources > P31 Soil surveys and mapping
U Auxiliary disciplines > U10 Mathematical and statistical methods
Subjects:(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 207 Environmental Engineering > Remote Sensing
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Keywords:vis-NIR, farm soil mapping, carbon, clay, silt, sand
ID Code:11265
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
External funders:Stiftelsen Lantbruksforskning
Deposited By: J Wetterlind
Deposited On:30 Jun 2014 08:26
Metadata Last Modified:24 Mar 2015 07:09

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