Yeah... I was thnking the same thing but its on miracle grow soil.... so I thought maybe it was over fed... also its only on day 37... you guys think still think i should feed her?
Hey Tatan.
There is a difference between the look of leaves that are having the life sucked out of them and leaves that are over nuted. Both yellow but one will go crispy on the edges first from overnuting.
MB and Westy are correct and I see this happen all over RIU with many many growers not using enough N during flowering. At day 37 your plant should not be yellowing badly. In fact you should be trying to carry most of leaves through until harvest. They should really only seriously yellow during the final flush stage. Healthy leaves = healthy buds.
Plants still need leaves to bud efficiently.
Without seeing pics of your yellowing I would say she needs a feed. All plants need Nitrogen in flowering along with P and K, not just P and K. My bloom ferts have a good supply of N in them and I carry most of my leaves through until shop time. Bloom ferts with a good supply of N will not effect budding as many are lead to believe.
The break down of my bloom fert is 20-12-37 plus I use the Pk 13-14 for a boost. That's a lot of N for bloom fert, more N than P, and more K than anything else, but the results speak for themselves.
Give her a feed and make sure she gets some N into her. You want to keep as many leaves as possible until flush time, she needs them to bud efficiently.