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Variability of the phosphate saturation degree of the sandy loam soils in West-Flanders, Belgium

J De Smet, Georges Hofman UGent, Marc Van Meirvenne UGent, Jean Vanderdeelen and Leon Baert (1996) COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS. 27(5-8). p.1875-1884
abstract
The variability of the phosphate sorption capacity (PSC) and the phosphate saturation degree (PSD) of the soil profile was studied in the sandy loam soil region (+/-1000 km(2)) of West-Flanders at different scales. In the frame of a regional inventory, the soil profile was sampled at 2000 m intervals on a square grid. In total, 296 observations were made. Additionally, in this area, 21 fields were sampled in detail: 15 augerings per field were made. Finally, on one field, seven observations were made at the micro scale: five augerings within a circular area of 30 m(2). All soil samples were analyzed for ammoniumoxalate extractable Fe, Al and P and the PSC and the PSD were calculated. The coefficient of variation (CV) of the PSC of the whole soil profile 0-90 cm was found to be 7% on the micro scale, 20% on the field scale and 28% on the regional scale. The CV of the PSD was found to be 9%, 21%, and 48% respectively. This means already quite a proportion? about 20%, in variation in PSC and PSD is situated at short distances (< 5m) Most of the variability in PSC is already found at the field level. On the contrary, the CV of the PSD is twice as high on the regional scale compared to the field scale. This may be explained by the regional structure of the P inputs, due to the local intensification of pig breeding activities. The criterion phosphate saturation is stochastically approached at the field scale. In the study area, the mean field averaged CV of the PSD was 21%. Taking into account the uncertainty when sampling, supposing a lognormal distribution of the PSD, the critical PSD of 24% is translated into a practical threshold PSD of 26% if 15 measurements per field are taken and a probability of 95% is pursued.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (proceedingsPaper)
publication status
published
subject
journal title
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
Commun. Soil Sci. Plant Anal.
volume
27
issue
5-8
pages
1875 - 1884
conference name
1995 International symposium on Soil Testing and Plant Analysis : Quality of soil and plant analysis, in view of sustainable agriculture and the environment
conference location
Wageningen, The Netherlands
conference start
1995-08-05
conference end
1995-08-10
Web of Science type
Article
ISSN
0010-3624
language
English
UGent publication?
yes
classification
A1
id
188037
handle
http://hdl.handle.net/1854/LU-188037
date created
2004-01-14 13:41:00
date last changed
2011-02-03 15:46:54
@article{188037,
  abstract     = {The variability of the phosphate sorption capacity (PSC) and the phosphate saturation degree (PSD) of the soil profile was studied in the sandy loam soil region (+/-1000 km(2)) of West-Flanders at different scales. In the frame of a regional inventory, the soil profile was sampled at 2000 m intervals on a square grid. In total, 296 observations were made. Additionally, in this area, 21 fields were sampled in detail: 15 augerings per field were made. Finally, on one field, seven observations were made at the micro scale: five augerings within a circular area of 30 m(2). All soil samples were analyzed for ammoniumoxalate extractable Fe, Al and P and the PSC and the PSD were calculated. The coefficient of variation (CV) of the PSC of the whole soil profile 0-90 cm was found to be 7\% on the micro scale, 20\% on the field scale and 28\% on the regional scale. The CV of the PSD was found to be 9\%, 21\%, and 48\% respectively. This means already quite a proportion? about 20\%, in variation in PSC and PSD is situated at short distances ({\textlangle} 5m) Most of the variability in PSC is already found at the field level. On the contrary, the CV of the PSD is twice as high on the regional scale compared to the field scale. This may be explained by the regional structure of the P inputs, due to the local intensification of pig breeding activities. The criterion phosphate saturation is stochastically approached at the field scale. In the study area, the mean field averaged CV of the PSD was 21\%. Taking into account the uncertainty when sampling, supposing a lognormal distribution of the PSD, the critical PSD of 24\% is translated into a practical threshold PSD of 26\% if 15 measurements per field are taken and a probability of 95\% is pursued.},
  author       = {De Smet, J and Hofman, Georges and Van Meirvenne, Marc and Vanderdeelen, Jean and Baert, Leon},
  issn         = {0010-3624},
  journal      = {COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS},
  language     = {eng},
  location     = {Wageningen, The Netherlands},
  number       = {5-8},
  pages        = {1875--1884},
  title        = {Variability of the phosphate saturation degree of the sandy loam soils in West-Flanders, Belgium},
  volume       = {27},
  year         = {1996},
}

Chicago
De Smet, J, Georges Hofman, Marc Van Meirvenne, Jean Vanderdeelen, and Leon Baert. 1996. “Variability of the Phosphate Saturation Degree of the Sandy Loam Soils in West-Flanders, Belgium.” Communications in Soil Science and Plant Analysis 27 (5-8): 1875–1884.
APA
De Smet, J, Hofman, G., Van Meirvenne, M., Vanderdeelen, J., & Baert, L. (1996). Variability of the phosphate saturation degree of the sandy loam soils in West-Flanders, Belgium. COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 27(5-8), 1875–1884. Presented at the 1995 International symposium on Soil Testing and Plant Analysis : Quality of soil and plant analysis, in view of sustainable agriculture and the environment.
Vancouver
1.
De Smet J, Hofman G, Van Meirvenne M, Vanderdeelen J, Baert L. Variability of the phosphate saturation degree of the sandy loam soils in West-Flanders, Belgium. COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS. 1996;27(5-8):1875–84.
MLA
De Smet, J, Georges Hofman, Marc Van Meirvenne, et al. “Variability of the Phosphate Saturation Degree of the Sandy Loam Soils in West-Flanders, Belgium.” COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS 27.5-8 (1996): 1875–1884. Print.