HELP!: Is this nitrogen deficiency?

I'm on my first grow, just moved to flowering last week. I'm growing indoor, in a growtent, with 600w lamp in soil. I have 4 white widows and 1 cali hash.

I began feeding with biobizz grow last week, as the lower leaves started to get little yellow spots on them. Started with 1.5ml per Litre of water, and moved up to 3ml on the next feed (2 days intervals).

I realised that was probably too big a jump and that I may have overdone it, panicking when I wasn't 100% sure it was a deficiency.

Next feed I gave 2ml of BioBizz Grow and also 2ml of Bloom. But the leaves at the bottom started yellowing quite a lot.

Fed them again today, and been reading up a bit and read about nutrient lock out. Bought a pH meter (the paper things are rubbish) and have just tested it and its WAY UP at pH 8.0 !! I have pH down, but not sure how much to use... any advice??

Also, do you think this is a nitrogen deficiency, or could it be something else?

The cali hash looks worse off than the widows, it's in a smaller pot (was a free seed we weren't counting on) so would use up the nutrients faster from the soil when repotted, this is what makes me think it's nute def.

California Hash:
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White Widows:
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Leaves getting crispy and stuff :
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Red stems from some branches:
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Pic 12 looks more like nute burn to me. And red stems are nothing to worry about.

Ok so maybe I should lay off the nutes completely for the widows then?

What do you think of the cali hash?

Looks like it could be a N deficiency (bottom leaves yellowing)

You know your nutes will generally drop the pH, right? Be sure to add anything you are gonna add prior to adjusting pH.

MrFishy said:

Looks like it could be a N deficiency (bottom leaves yellowing)

You know your nutes will generally drop the pH, right? Be sure to add anything you are gonna add prior to adjusting pH.

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Yeah I tested plain water, and nutrient-added water and the latter was a lower pH.

I've fed them this morning and the pH was at 8 this afternoon. With a pH so high, am I locking out the nutrients from the plants? I don't want to keep adding more and just create a toxic salt buildup .

BUMP! Please help

Don't want to do any more damage by inaction or the wrong action :S

Flush your plants now! Flush with 5 times the volume of the pot. that should help with the pH, and make sure you test the pH of everything you put in the plant. You should also get a TDS meter to measure how much nutrients are in the soil. When i got mine i flushed my plants and found that my PPM was at 4500 after watering them a few times with 1200ppm fertalizer and not flushing. the unused nutrients will change the pH and mess up everything and burn the plant, stop growth ect. I flush my plants every week and set the ppm back to 1000 and they never have any problems

looks normal to me lowwer leaves fall off and die.

BeefSupreme said:

Flush your plants now! Flush with 5 times the volume of the pot. that should help with the pH, and make sure you test the pH of everything you put in the plant. You should also get a TDS meter to measure how much nutrients are in the soil. When i got mine i flushed my plants and found that my PPM was at 4500 after watering them a few times with 1200ppm fertalizer and not flushing. the unused nutrients will change the pH and mess up everything and burn the plant, stop growth ect. I flush my plants every week and set the ppm back to 1000 and they never have any problems

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Thanks I'll go flush the cali now, can't make it any worse I guess :/ What's a TDS meter?

JoeCa1i said:

They need gardenlime...Also transplant,and a few drops of hydrogen peroxide,per liter of water............

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Going to the garden centre tonight to pick up a bigger pot for the cali hash. The Widows are in 9L pots, that should be big enough surely? What concentration H2O2 is usually used for plants? I've only ever used it in my hair

chitownsmoking said:

looks normal to me lowwer leaves fall off and die.

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This early on? Only 1 week into flowering...