Page 20 - World Reference Base for Soil Resources of Thailand
P. 20
Land Development Department Library
Simplified Key to the Reference Soil Groups
Argic and nitic horizons 23 yes yes Calcisols Calcic or petrocalcic horizon Nitisols no no yes 24 Retisols properties Retic yes Ferralsols Ferralichorizon no no yes 25 yes Argic horizon with Acrisols Planosols Abrupt textural change <24, BS <50% CEC c no no yes 26 Argic horizon with yes Lixisols <24 CEC c Stagnosols properties Stagnic no yes 27 no Argic horizon with Alisols >60% >24, Al sat CEC c yes or blackish mollic Chernic no Chernozems horizon yes 28 Argic horizon with Luvisols no >24 CEC c yes horizon Brownish mollic Kastanozems no and secondary CaCO 3 yes 29 Cambiso
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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