Yellowing fan leaves - How to prevent?

If u think your nutes are enough, the usually its a watering issue. Best practice is to water enough so your soil is just slightly dry on top every 2 days has been the best for me.

Many reasons why it can yellow, but due to it being in flower id hazard its just good old fashioned cannabilization for the purpose of freeing up some energy. The plant is making conscious decision to sacrafice some lower canopy sattelitte leaves the ones that recieve the least light. This is not a feeding issue, as above so below, doing so many colas with one root all is pushing the resources of the plant to the maximum capacity. If your doing fabric pots try throwing it.in a bigger fabric pot, don't even need to take it out the one it's in, it needs more total capacity. More rooooooootz

Hi. Soil contains enough nutrition for about 3 weeks. Then you can start adding nutes. So I think when you added nutes early you may have given to much nitrogen. The way the leaves are fat and heavy for your 1st few weeks also makes me think you may have been overwatering at that time also.

here you are doomed, everybody will give different versions mine : long term over-watering ( when you water too much or too often, while pots are still heavy and wet, when lockout happens top lair of soil dries, but weight still stays ) that changed ph balance inside of pot. root bound and calcium lockout, blocked nitrogen, need of potassium good watering regime, de-chlorination of water and 6.3 ph all you need algamic is good stuff, could help you, but created for hydro grows. i use ecothrive biosys 2-4 ml to rub into soil before watering, o just add to watering solution and mix it. weekly. doesnt effect ph, sorts nitrogen, boost roots and root zone fauna

Nitrogen deficiency: https://loudclouds.co/wp-content/uploads/2016/07/marijuana-deficiency-chart-jorge-cervantes.jpg you can feed them higher dose of N next time and a little bit longer in flowering. happy growing