Titre :
|
A technique for the non-destructive measurement of nitrate in small soil volumes
|
Auteurs :
|
D. Strong ;
P. Sale ;
K. Helyar
|
Type de document :
|
article/chapitre/communication
|
Année de publication :
|
1997
|
Format :
|
p. 571-578
|
Langues:
|
= Anglais
|
Catégories :
|
METROLOGIE
|
Mots-clés:
|
NITRATE
;
MESURE
;
SOL
;
CONCENTRATION
;
PRELEVEMENT D'ECHANTILLON
|
Résumé :
|
Two simple techniques designed to measure nitrate (NO3-N) non-destructively in small undisturbed soil samples are described. A small water-filled 'receptor' is placed in contact with a small soil volume (similar to 1.7 cm(3)) enabling the concentration of NO3-N in the interstitial water of the receptor to approach the concentration of NO3-N in the interstitial water of the soil sample by the process of diffusion. The NO3-N concentration in the receptor water is then measured, and from this, the NO3-N concentration in the soil is estimated. The receptor used in the first technique was a disc of agar (diameter 8 mm and thickness 3 mm). This was placed on the soil volumes and allowed to equilibrate for 22 h before NO3-N in the soil and in the agar were determined. The regression of actual soil NO3-N against estimated soil NO3-N using this receptor yielded an r(2) value of 0.99 and a slope coefficient of 1.01.
|
Source :
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Australian Journal of Soil Research, vol.35
|