Indoor RO water? Nute burn?

[HighFlyer]

Problem: Just started using RO water and AN grow,micro,boom, calmag+ and big bud all at once so not sure which it could be. I have 3 CBD crack at day 43 and 2 pineapple Express at day 27 since germination. 2 of the CBDs are showing brown/yellow spots and so is one of the pineapple. One of the CBDs is also yellowing on the bottom but has been that way since week 3 so i never cared to much about it. All this started when i got my RO water installed. I have only used calmag+ on the pineapple 4 ml/gal, no nutes. I just started feeding AN grow micro bloom with big bud at 1/4 strength and 2mlgal of calmag+ 3 feedings ago every feeding on the CBD crack.

i have had no issues at all until i switched to RO water and calmag with pineapple express. Same with CBD crack plus nutes at 1/4 strength.

Medium/grow method: soil, foxfarm ocean forest.

Feed: and supplements used: Advanced nutrients grow micro bloom, big bud, calmag+. 10-20% runoff

water source:RO water

Strain/age:CBD crack 43 days, pineapple express 27 days

light used: eletric sky 180w v2, 24 inches at 100%

Climate:night 73 day 76 up to 79 sometimes

Additional info:

 

[HighFlyer]

Water PH going in 6.5. Runoff on the CBD was 6.4 today and runoff on the pineapple was 5.8 today.

 

[HighFlyer]

Started spreading a little on the 3 week old pineapple. On 25% of the leaves. Other pineapple still shows no signs.

 

[Waira]

pardon the delay HF!

Pineapple pot is going too acidic, though mind that run-off is dubious for accuracy unless done exactly right... No nutes you say? The symptoms on newest growth is a micronute defc., looks like B to me... Feed her ASAP, and adjust you pH up to the RO water, adding Ca-Mg first,...

 

[HighFlyer]

The plants are 1 month into flower and almost 2 months old. Im seeing more and different issues on the old and middle aged leafs. Is this normal?

I bought a cheap soil ph meter off amazon with two little prongs but feel like its useless...

 

[Waira]

Yup, major fan tapping for what mobile nutes are stored in there, but not all nutes are, so feeeed! Bloom nutes, what do you have?

Get the Accurate 8 soil pH probe (CPW is the brand) ... those skinny units are lousy!

 

[HighFlyer]

I am using AN micro,grow,bloom. they told me to half the nutes on autos. im at full strength now and looking better.

However next grow Im going to try the dry amendments from Green Sunshine company called earth dust. mixing nutes all the time kinda sucks.

 

[Waira]

Hmmm, that's a sweeping generalization about auto's, but as seedlings, it more true than vs. photo's I believe... plus any hiccups early on can lead to stunting, poor veg'ing so it does pay to be cautious up to a point.. Auto's are now so diverse, and some carry similar quirks that their parents may have, like nute sensitivity, different tolerances, demands etc.,... sometime the only way to know is to push a little and look for the tell-tale sign of early tip yellowing/burn and back off... that EC/TDS meter will help a lot with this, you'll know exactly how rich your feed soln. is, not guessing by input volume!
Not familiar with that light co's nutes,.. is it similar to Greenleaf nutrients MegaCrop, a so-called all-in-one nute? This product I know well,... it has it's pro's and con's for sure, and i find it's subpar for blooming due to high N, low P values... It "works", OK to pretty well depending on the the usual cadre of factors.... IMO, a little mixing is worth the effort, allowing you to tinker and adjust if needed, which is totally out of your hands with AIO types, so a caveat there!

 

[HighFlyer]

Here we go again. Haven't seen this one yet. On the pineapple Express auto. Gave them full strength nutes yesterday for the second or third time so i knew they could handle it. Found something that looks like a K deficiency but its on newer leafs. Pretty much happened over night only on this pkant and only on the one branch I believe.

 

[Waira]

Looks like early nute burn, those nutes can build up over feedings and trick you... 1,2 times they look OK, next round and then something happens,... when it hits newest growth, the most active area, that's a pretty sure sign of nute burn starting up...tips may follow soon,...
Back off the feeds, and retest the soil for pH... you may need to flush the pot if it's getting bad, just too much nute salt load in there which can also be the cause of off-pH,...