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THE INTERACTION BETWEEN POTASSIUM AND MAGNESIUM iN RED YELLOW PODZOLIC SOILS WITH LATERITE AND ITS EFFECT ON NUTRITION OF COCONUT PALMS (Cocos nucifera, L.)

Author:

L. L. W. SOMASIRI

COCOS, LK
About L. L. W.
Coconut Research Institute, Lunuwila. Sri Lanka.
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Abstract

The interaction between plant available potassium and magnesium in
highly leached red yellow podzolic soils with laterite in Southern coastal
area of Sri Lanka and its effect on coconut palm was studied in a 3x2 KxMg
factorial experiment that consisted of 3 levels of potassium and 2 levels of
magnesium fertilizer application to coconut palms in plots. Five years after
continuation of treatment application, soil samples were taken from top soils
(0-20 cm) and sub soils (20-40 cm) at monthly intervals for 10 months and
analyzed for exchangeable potassium and magnesium (1M ammonium acetate
extraction at pH 7.0) and water soluble potassium and magnesium (1:10
soil/water ratio). Leaf samples taken from the 14* frond at bimonthly intervals
were analyzed for potassium and magnesium.
The results showed that the application of potassium fertilizer decreased
the quantity of both exchangeable and water extractable magnesium
and magnesium fertilizer decreased the quantity of exchangeable potassium
in soils. The mutual decreasing effect on the exchangeable fraction of each
nutrient is attributed to low cation exchange capacity and base saturation of
the soils. The close association of the coconut leaf nutrient contents with soil
nutrient status implies that poor chemical characteristics of red yellow podzolic
soils bring about imbalance of potassium and magnesium nutrition in
coconut palms.
How to Cite: SOMASIRI, L.L.W., (2010). THE INTERACTION BETWEEN POTASSIUM AND MAGNESIUM iN RED YELLOW PODZOLIC SOILS WITH LATERITE AND ITS EFFECT ON NUTRITION OF COCONUT PALMS (Cocos nucifera, L.). COCOS. 12, pp.18–32. DOI: http://doi.org/10.4038/cocos.v12i0.2162
Published on 10 Aug 2010.
Peer Reviewed

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