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The Chemical Composition of the Colloidal Fractions From the Major Soil Series of Alabama
Author(s) -
Davis Franklin L.
Publication year - 1935
Publication title -
soil science society of america journal
Language(s) - Portuguese
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1935.036159950b1620010040x
Subject(s) - soil series , series (stratigraphy) , composition (language) , chemical composition , environmental science , colloid , environmental chemistry , soil science , chemistry , soil water , geology , soil classification , art , organic chemistry , paleontology , literature
A summar y i s give n of th e silica-alumin a ratio s o f th e colloida l fractions , an d o f th e tota l bas e exchang e capacities , th e exchange abl e calcium , an d th e percentag e calciu m sat uratio n o f th e surfac e an d subsoi l horizon s o f 120 Alabam a soils . Th e silica-alumin a ratio s of th e colloida l fraction s separate d fro m th e surfac e soil s ar e show n b y location s o f th e soil s o n a n outlin e map o f Alabama . Th e dat a includ e analyse s o f soil s o f th e followin g soi l series : Norfolk , Greenville , Cecil , Hartsells , Decatur , Oktibbeha , Eutaw , an d Lufkin . Fro m th e dat a presente d i t l a observe d tha t th e 6 1 F . mean annua l isother m mark s th e norther n limi t o f .occurrenc e i n Alabam a o f soil s havin g a matur e profil e an d a silica-alumin a rati o o f th e colloida l fractio n o f les s tha n 2.0 . Thes e dat a substantiat e earlie r wor k don e by other s o n thi s particula r subject . The mean silica-alumin a ratio s o f th e colloida l fraction s separate d fro m representa tiv e soil s o f th e Norfolk , Greenville , an d Ceci l serie s ar e almos t identical—betwee n 1.6 7 and 1.76 . Ther e i s a greate r rang e i n th e S102/A1 203 o f th e Norfol k an d Greenvill e soil s tha n ther e i s i n thos e o f th e soil s o f th e Ceci l serie s a s wel l a s a correspondingl y greate r rang e i n th e latitud e o f thei r loca tion . Th e mean SiOg/Al20 3 o f th e colloida l fraction s o f th e surfac e soil s o f th e Hart sell s an d Decatu r series , whic h occu r i n north er n Alabama , ar e 2.1 0 an d 2.16 , respectively . The SiOo/Alg0 3 o f th e colloida l fraction s o f th e Oktibbeha , Eutaw , an d Lufki n clay s o f th e Blac k Bel t ar e large r tha n thos e o f soil s hav in g matur e profiles . Fro m a comparison , o n th e basi s o f col loida l cla y content , o f th e bas e exchang e ca pacitie s o f soil s o f th e Ceci l serie s t o thos e of th e Norfol k an d Greenvill e serie s i t woul d see m tha t th e soil s o f th e Ceci l serie s hav e undergon e a furthe r weatherin g effec t tha t ha s resulte d i n a breakin g dow n o f thei r bas e ex chang e comple x an d a partia l destructio n o f thei r capacit y fo r bas e exchange . I t i s als o observe d tha t thos e soil s i n whose profile s re d subsoil s hav e bee n devel oped als o hav e a relativel y hig h percentag e calciu m saturatio n o f th e bas e exchang e capacity .