Hi Bharath, How old the trees are? Which cultivar you are growing? Does your field have proper drainage? Do you know the pH of the soil?
It is better to go for soil testing before taking any measures.
According to Tiago de A. Pereira et al., the yield of dwarf coconut can be increased in saline-sodic soil by applying potassium sulfate.
More information on salinity management
Establishment of young “dwarf green” coconut plants in soil .
Posted by: Dr. Ravishankar Narayana
Posted: July 14, 2017