Not needed for Thai strains growing outdoors in fresh soil.
But oddly enough my hybrid seeds from the west require both Ph and nutrients in soil and can't take full sunlight.
I've found a strange mix of ways to grow my seed bank hybrids.
16+hrs of light/day during veg, in a tent but taken outside under 50% shade for the day. A cup of nutrient/water mix WESCO 30-20-10+TE (1gm/ltr) at Ph6 every day on the soil.
Normal Thai daylight for flower under 50% shade, taken out of the elements at night, a cup of WESCO nutrient/water mix WESCO 30-20-10+TE and 0-52-34 (2gm/ltr) at Ph6 every day on the soil.
Saves on the electricity and the bugs don't seem to like being moved around.
I had a lot of bug problems when just growing in a tent.