You would not melt it, but dissolve it in water.
If you diluted the solution sufficiently it would be safe to use on plants.
There are specialty formulated fertilizers for use in water, which can be applied to the soil or sprayed on the herbage.
If you diluted the solution sufficiently it would be safe to use on plants.
There are specialty formulated fertilizers for use in water, which can be applied to the soil or sprayed on the herbage.