First thing to do is find out about where the pH and EC/PPM buffer of the soil is with a quick run off test using RO/distilled water. RO has no pH or mineral buffer. The run off will give a little more accurate result. A decent test is to use about an equal volume of water to media and then check the run off numbers. If pH and/or PPM are out…

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Every watering.

An out of range pH buffer will lock out minerals in any media. It’s almost always the reason plants lack nutrition. Often times heavy feeding from veg through mid flower can cause a salt build up if allowed to dry back too much too often tanking pH.

Check the run off pH after watering to make sure it’s also in range.

Limiting root mass, limits the plant’s overall structure no matter how often irrigated. The plant can not and will not produce thick stalks/branches with a tiny root system no matter how much bio-mass is above. The growth will be thin and scraggly. Yield at each node is directly related to stem girth as well.