Using General Hydroponics fertiliser and following mixing guide on bottles from seedlings to flowering and have had good success in past but this current plant looks so yellow . Using Spiderfarm led light. I use PAR 300 on seedlings,600 on vegetation and 900+ for flowers. Doing everything the same but this current plant seems so yellow all the way through. I’m stumped any ideas what going on? Two photos in closed, green one is from other grow examples yellow is plant in question.
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Nutrients can vary from plant to plant. Are you checking pH and ppm #s in and out. More info would help diagnose possibilities as well.
Answer these simple questions the best you can.
Indoor or outdoor? - size of grow?
Otigin of seeds?
Regular, feminized, or autoflower?
Origin of water. PH, EC/TDS of source water?
PH and TDS/EC of if mixed solution?
Grow method? Soil, Soil-less, Coco, Hydro, Aquaponics. Please explain.
Nutrients or fertilizer system used.
What typr of lighting are you using? LED, HID (MH, CMH, HPS), or Fluorescents? Please elaborate.
What are the temps in your growspce? Day / Night?
What is the RH = relative humidity in your growspace? Day / Night?
AC, Humidifier, De-humidifier?
Do you have a Ventilation system? Size? 4", 6"?
Co2 Yes / No?
How long have you been growing?
What budget have you set in order to grow successfully?
If you grow hydro, then please explain your hydro method. DWC, R-DWC, Ebb and Flow, Or; Other? Other?
16b. Size and temperature of solution in reservoir
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I agree, with you my friend plants look unhappy. I’d start with feeding the bloom nutes at about 800 to 1000 PPM , follow up by checking runoff numbers PH and PPM
Make adjustments accordingly, my first thoughts plants, look hungry. and ph could be off. I’m assuming your in soil. Good luck 
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Using autopots, cococoir and perlite, not sure how to check runoff in autopots.
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Using autopots, cococoir and perlite, not sure how to check runoff in autopots. pH is 7.1, spiderfarm LED lighting at PAR 920 on flowering setting.VPN at about.90. Temp about 78. Autoflower Girl Scout Cookies. Around 55 days old. First grow with this issue. Biggest struggle with this grow was high VPN and temperature.
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Okay. Im running the same basically. In the coco vyou need to water to runoff each time. You water until it comes out maybe 5-10% at least. A good dripping. That will flush out the left over nutrients each watering. pH should be around 5.75 to 6.25 ish. For nutes I run jacks at 1600 or 2.0 ish. It’ll recover. I just did this to a plant.
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There ta go. Get your ppm down asap.
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Just pH water down to 6.0. Keep putting that in and check the water from the bottom as it comes out. It might take a few gallons. Get that pH down first. Then you get her squared away. Take it out of the auto pots and clean those up as well.
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Ph seems really high for coco
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@SausageMahoney has you covered , coco not in my wheelhouse.
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If your in coco, the 7.1 is your problem. I just switched from coco back to Promix in Autopots. My personal opinion Autopots keep media TOO wet. I’ve started turning mine off and on for watering. I had all grades of issues last grow and they ended up being from overwatering in the Autopots. Even in coco and perlite, I had some nasty smelling roots when I chopped them. But back to yours, 7.1 is out of range and you’re not uptaking nutes. Personally, I would set them out and flush them with 5.8 ph water until ph comes down and immediately follow up with a full feed at 5.8-6.0 . Coco is considered hydro and ph is same. You could try the Autopots again at lower ph, I was running 5.6-5.8 in res as ph would climb over time and sitting in the pots. I feel coco does better with frequent fertigation with runoff.
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