Abstract:
Comparative fixation of NH, and K by wetland rice soils in relation to clay mineral composition and treatment sequence is of agronomic interest. An attempt was mode to clarify this relationship by employing the normally recommended doses of fertilizer, 3 application sequences, and 5 soil clays of divergent mineralogies. The results show that montmorilionitic clay is the greatest fixer of NH4 , but least of K. X-ray amorphous clay also prefers NH4 over K. Vermiculitic cne Leidcllitic clays strongly fix both NI-{.and K. Soil clay consisting of hydrous mica, chlorite, and halloysite fixed low proportions of applied NH4and K. The sequence in which NH4 and K are applied did not appear to affect the relative amounts that are fixed.
Page(s):
23-25
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Agricultural Research, Volume: 6, Issue: 1, Year: 1985