Abstract:
An experiment was conducted at the Coconut Research Station, Pilicode,
Kerala to study the effect of substitution of potassium applied to coconut by
sodium. Twentyfour year old coconut palms grown in laterite soil and which
received N,P and K at the recommended dose were selected for the study. Replacement
of potassium applied as KCI at the rate of 1000 g K20/palm/year to the extent
of 50% or even 75% by Na.,0 applied as NaCI for 5 years did not reduce the yield of
nuts. Application of NaCI at this rate for 5 years to the laterite soils of Pilicode
receiving fairly good rainfall did not alter the pH, EC and aggregate stability of
the soil.
