Any ideas what is causing this?

[Eledin]

Appreciate it! I'm fairly new, can you elaborate on not pH ing and how it affected this crop?

Ph of below 6,5 is for veg, not for flower. For flower you wanna aim at a ph of 6,5 with mineral fertilizers like yours. Thats because what ph does is dictate which nutrients are more available for the plant and their needs during flower change so for example if your plant is getting more iron because its more soluble at 6,2 but youre in flower and the plant doesnt want it its gonna eat it anyway because its in the water which can lead to nute burn or umbalance.

 

[Eledin]

Also you need to give them 2 weeks or at the very least 1 of only water before harvest. Unless youre growing organic you wanna do a flush period. Were you feeding them once or twice per week or every watering? With AN and many other brands is easy to overfeed like people said, specially if you dont to nute-water-nute-water,etc
Were you feeding every watering?

 

[JoJolewinsky]

Also you need to give them 2 weeks or at the very least 1 of only water before harvest. Unless youre growing organic you wanna do a flush period. Were you feeding them once or twice per week or every watering? With AN and many other brands is easy to overfeed like people said, specially if you dont to nute-water-nute-water,etc
Were you feeding every watering?

I was doing nute water nute water, but tbh the last 3 waters I've done with nutes cuz I thought it was a deficiency. Live and you learn. I'll be starting my next grow immediately after I'm done with this one so I'm looking to gather as much information as possible!