Fjölrit RALA - 15.06.2004, Side 112

Table 1 A comparison between mineralization parameters of Andosols and non-andic soils
from Japan (Saito, 1990) and Icelandic soils.
lcelandic Years of k Afo total N No/Nt
Soils ploughing day'115°C mg/kg % %
Korpa 0 0,019 32,7 0,49 0,7
2 0,070 39,78 0,51 0,9
7 0,017 58,20 0,57 1,5
Eyjafjörður 0 0,035 64,52 0,9 1,3
6 0,017 69,91 0,7 0,7
13 0,035 91,92 0,8 1,4
Skagafjörður 0 0,012 13,04 0,17 0,7
2 0,034 21,38 0,15 3,4
6 0,030 37,66 0,22 2,1
k
Pálmasson et al., (1996) day'1 20 °c
other soils 0,0380 1,2 0,21 6,1
andic soils 0,0376 0,9 0,0065 2,7
andic soils 0,0355 20,7 0,0205 3,4
Japanese k
Soils (Saito, 1990) day'1 25 °c
Andosols 0,0043 176 0,5 3,5
other soils 0,0059 100 0,28 8,2
k= rate constant
No= N mineralization potential
Ato / Nt = Mineralizable N
This is an ongoing research, and many factors are yet to be investigated in relation to
mineralization in Icelandic Andodol’s. Those factors include microbial biomass, clay content
and organo-metallic complexes as well as taking into account the affect of a cooler
environment on the physiological status of Icelandic Andosols.
References
Boudot, J.P. 1992. Relative efficiency of complexed aluminum, noncrystalline A1 hydroxide,
allophane and imogolite in retarding the biodegration of citric acid. Geoderma 52:29-39.
Pálmason, F., H. Þorgeirsson, H. Sigurðardóttir, H. Bjömsson, O. Amalds. 1996. Níturlosun í
jarðvegi. Icel. Agr. Sci. 10:185:208. (in Icelandic, with English abstact).
Bremmer, J. M. and C.S. Mulvaney. 1982. Method of Soil Analysis Part 2-Chemical and
Microbiological Properties. Second edition. Am. Soc. of Agro. Inc. 595-622.
Saito, M. 1990. Nitrogen mineralization parameters and its availability indices of soils in
Tohuku district, their relationship. Japanese Joumal of Soil Science and Plant Nutrition
61:265-272. (in Japanese, with English abstract).
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