G14 help

[Boognelson87]

Hey guys, my g14 is 24 days old. In 50/50 ffof and happy frog in 3 gallon container under vivosun led lights about 22 inches from the top. Up until now I've only added cal/mag, and microbes. No nutrients at all and ph water from 6.2-6.5. I water 1/4 gallon or so every 3 days ever S ince I could see roots at bottom of plant. I have minimal runoff. Need help diagnosing this yellowing problem if its over/under watering or lack of nutrients or something else. Thanks a bunch

next two photos are closer to the top of plant

 

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[Boognelson87]

Forgot to add temps is 75-77 degrees and humidity is 36 percent.

 

[Boognelson87]

@Waira I was told to tag you and listen carefully to whay you say

 

[Boognelson87]

Todays photo after feeding 1/4 dose of big bloom and grow big yesterday. Tips burnt are from a previous cal mag feeding. Yellowing is my concern. Haven't seen much change in a day. My run off ph is 6.2

 

[Waira]

-- you need to feed ASAP, that soil isn't nearly rich or good enough to go this long w/o feeds,... it's not balanced nor complete for all the needed nutes. soils are dubious in general, so a heads up there; HF is usually better, milder, but OF often shows to be badly off pH (acidic). I suggest getting a soil pH probe, like the Accurate 8, or the more $$ Blue Labs unit.... Managing your pH inputs and monitoring the in-pot pH will go miles toward avoiding many common problems associated with this,...
Symptoms on lowers, fading looks like N defc; tips and margins yellowing looks like K defc. starting,.... more will follow soon, so get on the nutes. What do you have for this? Depending on the brand and cocn., you should use a dilute solution first to see how they react and ease into increases,....

 

[Boognelson87]

@Waira thank you so much I fed yesterday with fox farm grow big and big bloom 1/4 strength. I figured it was low needing some food.

 

[Boognelson87]

A ph probe will be purchased

 

[Waira]

..since your starting bloom, switch over to Tiger Bloom as your base bloom nute after a couple feeds of Grow Big, just to boost the N a bit,... BB is nice stuff, but look at the NPK#'s, all in the decimals,.. was idiotic in their naming of this product, it jam's new growers up all the time, making them think it's a proper bloom nute... it isn't! Treat ot like a supplement, and use at full strength, or half and apply more often,... 2x weekly is fine,...

 

[Boognelson87]

Sounds good. I gave 2nd feeding today of grow big. Next watering will be just photosynthesis plus (microbes) and ph water. Then after that will be starting tiger bloom and BB. Then every 3rd watering will be plain ph water unless I need a little cal mag. Or do you recommend adding cal mag if needed with feed days? Using led lights In sure ill need another feed of it maybe 2. Hard telling though at this point