Page 21 - World Reference Base for Soil Resources of Thailand
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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
















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