Pomelo Tree and the Salt

My Pomelo tree is not sweet at all, slightly bitter, sour but juicy. My auntie says by feeding the tree with salt, the fruits will become sweet. What is the chemistry behind such treatment, I wonder?
Salt is just sodium chloride, I have not heard Pomelo trees growing well at the sea side subject to tide. It only grows well at the hilly land. Are we inducing the plant to change chemical reactions by causing it to suffer, as salt can be harmful to many living cells?

Let's wait for the next batch of Pomelo fruits.