Its a 5 gal square fabric pot. But I believe that the felt type material the pot is made from holds water like a sponge. Its better now thoughWhat size is your pot. You said you've only watered 4 times since planted..does your pot have drain holes in the bottom. Water less more often.. and it's time to feed some nutes. Give a balanced feed of micro, grow and bloom. Follow feed recommendations from manufacturer at 1/4 strength for a while and see how they react. Don't feed every watering. Water, water feed... Don't water to runoff unless your trying to flush, that's for coco..cheers mate..good luck.
Thats exactly what Ive been doing less water more often. Now im watering about a half gal about ever 2-4 days. Did a nute flush with ff sledgehammer and followed it up with a dose of ff boomerang plamt responded well so far. Think whichever leaves are yellowed completely arent going green again ago