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Comparative Ammonium and Potassium Fixation by some Wetland Rice Soil Clays as Affected by Mineralogical Composition and Treatment Sequence
Author(s) -
Bajwa M. I.
Publication year - 1987
Publication title -
journal of agronomy and crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.095
H-Index - 74
eISSN - 1439-037X
pISSN - 0931-2250
DOI - 10.1111/j.1439-037x.1987.tb00613.x
Subject(s) - chlorite , clay minerals , potassium , composition (language) , halloysite , cation exchange capacity , chemistry , soil water , kaolinite , sequence (biology) , ammonium , agronomy , montmorillonite , mica , geology , mineralogy , environmental chemistry , geochemistry , soil science , biology , paleontology , linguistics , quartz , philosophy , biochemistry , organic chemistry
Comparative fixation of NH 4 and K by wetland rice soils in relation to clay mineral composition and treatment sequence is of agronomic interest, but information on the subject is scanty. An attempt has been made to clarify this relationship by employing the normally recommended doses of fertilizers, 3 application sequences, and 5 soil clays of divergent mineralogies. The results show that montmorillonitic clay is the greatest fixer of NH 4 , but least of K. X‐ray amorphous clay also prefers NH 4 over K. Vermiculitic and beidellitic clays strongly fix both NH 4 and K. Soil clay consisting of hydrous mica, chlorite, and halloysite fixes low proportions of applied NH 4 and K. The sequence in which NH 4 and K are applied does not appear to affect the relative amounts that are fixed.