Clay mineralogical and ammonium fixation characteristics of some tropical upland rice soils

Bajwa, M. I.

doi:10.1080/00103628209367323

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1985

1987

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“…That certain soils fix NH4 as well as K is well documented (6,10). Fixation normally occurs in the clay fraction whose mineralogical nature is very diverse (3). Wetland rice is commonly fertilized by simultaneous addition of NH4 and K fertilizers as basal application.…”

Section: Introductionmentioning

confidence: 99%

Comparative Ammonium and Potassium Fixation by some Wetland Rice Soil Clays as Affected by Mineralogical Composition and Treatment Sequence

Bajwa¹

1987

J Agronomy Crop Science

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Comparative fixation of NH4 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 NH4, but least of K. X‐ray amorphous clay also prefers NH4 over K. Vermiculitic and beidellitic clays strongly fix both NH4 and K. Soil clay consisting of hydrous mica, chlorite, and halloysite fixes low proportions of applied NH4 and K. The sequence in which NH4 and K are applied does not appear to affect the relative amounts that are fixed.

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Section: Introductionmentioning

confidence: 99%