Page 21 - World Reference Base for Soil Resources of Thailand
P. 21
Land Development Department Library
Calcisols Retisols Acrisols Lixisols Alisols Luvisols Cambisols Arenosols Fluvisols Regosols
yes yes yes yes yes yes yes yes yes yes RSGs RSGs is not found in Thailand and may need further
Calcic or petrocalcic horizon no properties Retic no Argic horizon with <24, BS <50% CEC c no Argic horizon with <24 CEC c no Argic horizon with >60% >24, Al sat CEC c no Argic horizon with >24 CEC c no Cambic horizon no Coarse texture >100 cm no Fluvic materials no Other soils RSGs is not found in Thailand (6 RSGs) classification (8 RSGs)
Simplified Key to the Reference Soil Groups
23 24 25 26 27 28 29 30 31 32
Nitisols Ferralsols Planosols Stagnosols Chernozems Kastanozems Phaeozems Umbrisols Durisols Gypsisols
yes yes yes yes yes yes yes yes yes yes
Argic and nitic horizons no Ferralichorizon no Abrupt textural change no properties Stagnic no or blackish mollic Chernic horizon no horizon Brownish mollic and secondary CaCO 3 no horizon Mollic no Umbric horizon no horizon or petroduric no or petrogypsic Gypsic horizon
13 14 15 16 17 18 19 20 21 Duric 22
Histosols Anthrosols Technosols Cryosols Leptosols Solonetz Vertisols Solonchaks Gleysols Andosols Podzols Plinthosols
yes yes yes yes yes yes yes yes yes yes yes yes
Organic matter >40 cm deep no modifications Human no Artefacts no horizon Cryic no Depth <25 cm no horizon Natric no horizon >35% clay vertic no horizon Salic no Gleyic properties no Andic and vitric horizons no horizon Spodic no or petroplinthite Plinthite within 25 cm
1 2 3 4 5 6 7 8 9 10 11 12
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