Plant problem help

I have a problem 1 I dont know how to create a post on here so i can start this off... The original problem is I have 4 plants growing outdoor Ive grown several times so i got some experience in this however this is my first outdoor. My strain is purp train wreck and the plants look great I just transferred them into 15g pots from soil to cola the plants are about 4ft. My middle nodes are turning yellow.... slowly loosing color and im concerned about it..... Im using roots organic 707 soil with sensi grow part A&B with a sweetner and im also using a foliage spray that contains N,P,K....... every third water the plants are getting regular water no nutes.... wtf is going on ant help? and please reply to where i can find this damn thing it was hard enough trying to find an area to post

First off, I'd like to reach out from the community here and welcome you to this forum!

What you are explaining could be many things. If the middle nodes are becoming yellow, that indicates that it isn't a lack of sun that's causing the yellowing. Do you have a pH meter to measure whatever you're giving them?

How many times are you watering/feeding them?

Have you inspected your plants for any bugs?

I wish you the best of luck with your outdoor, I've had some good and bad times with nature.

Thank you.... so I was looking into this i think it might be my sweetner cuz i was using the recommneded dosage like a moron so it could be magnesium burn..... I water at 6.1 and i dont water until the soil has become some what dry.... I have no bugs just annoying ass flies its with 2 plants and the others look fine! seeing as how they all get the same shit i wondering wtf is happening

Welcome to the Group....Some pics would be nice.... Yeah, always half or at least 1/4 of the recommended dosage on any nutes... I'm a lil new but this forum has helped me out alot.....Best wishes