is this light stress? pics included

Hi All,

I've a few plants in flower, week 2-3, there in soil and fed with biobizz. 3 of the 7 plants are starting to get some problems, pics below.

I have then under 2 * 300w led's, and am wondering if this is too much light?

Temps are mid 60's with lights off and mid 70's on. I feed with biobizz grow atm. soon to switch to their flowering nutes, ph is always 6.5 with the nutes mixed with tap water. I add a teaspoon of epsom salts/gal as the tap water here is pretty hard 7.2.

I normally grow in hydro, but after having problem after problem with it I've gone back to soil.

The soil mix is 4/5ths compost (general purpose) 1/5 perlite and hydroclay.

My limited knowledge points to a nitrogen prob. Good luck

Not nitrogen, it's deffinitely a Mag def...you need to be adding a table spoon of epsom to that gallon of water/nutes...and you want to continue feeding a lil veg nutes IMO all the way up to 2-3 weeks before harvest to keep those leaves nice and green, that's where the buds will draw their food from the last 2-3 weeks of flower...and no your lighting is fine...good luck man and lookin good so far...

I took another look at those pics and in the first one the poor girl in back needs to be flushed...or it's gona die...

RIKNSTEIN said:

I took another look at those pics and in the first one the poor girl in back needs to be flushed...or it's gona die...

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The one in the back is from a previous grow in hydro, they got hit with root rot so I stuck them in soil for the last few weeks in the hope they might recover a bit before I chopped them, but I think they were just too far gone, they never recovered anyways and their for the chop as soon as I need the space.

RIKNSTEIN said:

Not nitrogen, it's deffinitely a Mag def...you need to be adding a table spoon of epsom to that gallon of water/nutes...and you want to continue feeding a lil veg nutes IMO all the way up to 2-3 weeks before harvest to keep those leaves nice and green, that's where the buds will draw their food from the last 2-3 weeks of flower...and no your lighting is fine...good luck man and lookin good so far...

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Mag is what I first thought so I hit it with a teaspoon of epsom in 2 litres of water a couple of days ago. I'm thinking it wasn't enough now your saying a tablespoon/gal, I'll try it with the tablespoon. see what happens. From what I gather they should recover within a few days/week or at least not get any worse lol.

spliffup1234 said:

Mag is what I first thought so I hit it with a teaspoon of epsom in 2 litres of water a couple of days ago. I'm thinking it wasn't enough now your saying a tablespoon/gal, I'll try it with the tablespoon. see what happens. From what I gather they should recover within a few days/week or at least not get any worse lol.

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I concur with RIKNSTEIN. It looks to be a magnesium deficiency to me too. As far as recovery? From my experience, they leaves just don't get worse. I have seen a couple leaves gain some of their color back, but not 100%.

Mag deficiency. I have been using Humboldts Equilibrium Cal-Mag supplement. It is full of kelp and crab meal. Kelp is good for plants that are under stress. You should expect some more yellowing starting from the bottom fan leaves and working its way up as the plants move N from the leaves to the buds. This is perfectly normal. IMO if you are growing in soil, they should not be getting any grow formula while in late bloom, or they will not deplete all of their N during flush and you will have that MiracleGro taste in your buds. Keep on truckin' and Good Luck!

I recommend an inexpensive soil NPK test kit. $13 on ebay. Takes all the guess work out of what she needs or has too much of and rules things out!

ThePerfectGrow said:

I recommend an inexpensive soil NPK test kit. $13 on ebay. Takes all the guess work out of what she needs or has too much of and rules things out!

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Didn't know these existed, worth having in the arsenal.

For anyone who want's a link, these people do them:
http://stores.ebay.co.uk/River-Country-LLC?_trksid=p2047675.l2563

ALB.

Will get back to you all in a couple of days, thanks for all the help peeps!!

spliffup1234 said:

Mag is what I first thought so I hit it with a teaspoon of epsom in 2 litres of water a couple of days ago. I'm thinking it wasn't enough now your saying a tablespoon/gal, I'll try it with the tablespoon. see what happens. From what I gather they should recover within a few days/week or at least not get any worse lol.

Click to expand...

Ya man, I have a Blue Rhino strain and if I "just" water them, they hate me and start to turn yellow and the leaf tips look crispy....so for them I don't water, I feed them constantly and they're beautiful...and it's usually in flower too...and when you do something to your plants you can expect 3 days of wait to see if it worked...I mean I'm not there and don't know how you take care of them...that's why some people are guessing at what's wrong...as long as when you water/feed there's plenty of runoff you can count out a salinity build up, cuz your nutes have alot of salt in them and that's why we want runoff so the old stuff will flush out and the new can do it's job...good luck man and never give up, you will learn to look at your plants and say, oh ya they need this...peace...

seem to be worse today, I watered all of them last night, with a tablespoon/gal epson salts + half strength nutes.

I'm seeing the same problems occurring on 2 more plants, pretty sure the others are starting to show symptoms.

I'll take a pic later and post it up.

Could it be a toxic salt buildup? I'm using biobizz organic grow formula. I read somewhere that it's pretty impossible to overfeed with organics?

I tested the soil ph today, and they are sitting at 6.5.

spliffup1234 said:

seem to be worse today, I watered all of them last night, with a tablespoon/gal epson salts + half strength nutes.

I'm seeing the same problems occurring on 2 more plants, pretty sure the others are starting to show symptoms.

I'll take a pic later and post it up.

Could it be a toxic salt buildup? I'm using biobizz organic grow formula. I read somewhere that it's pretty impossible to overfeed with organics?

I tested the soil ph today, and they are sitting at 6.5.

Click to expand...

You sure can overfeed in organics.

spliffup1234 said:

seem to be worse today, I watered all of them last night, with a tablespoon/gal epson salts + half strength nutes.

I'm seeing the same problems occurring on 2 more plants, pretty sure the others are starting to show symptoms.

I'll take a pic later and post it up.

Could it be a toxic salt buildup? I'm using biobizz organic grow formula. I read somewhere that it's pretty impossible to overfeed with organics?

I tested the soil ph today, and they are sitting at 6.5.

Click to expand...

You can over do things in organics.

Having and have had similar problems I'm going on the magnesium side as well. It looks like you're still sitting just fine though so don't overreact and do something crazy. I too have hard water and I never use salt or anything like that.

Pics 1.5 days later



Seem a little worse today, or maybe i'm paranoid.

so 2 weeks on? anybody got any ideas



so what I did in the last 2 weeks:

1 flushed the rear left, with 10 ltrs plain tap water ph 7 (the only one I flushed, and doesn't seem to have made a difference)

then just watered all the others with distilled water from my dehumidifier (has a handy plastic container to collect it)
The ph of this water is 6.7 and 2 ppm's, not that it means much, a 30 dollar meter doesn't measure that well at small amounts.

The thinking behind this is that I fed them every watering with (the bottle dosage lol) biobizz grow, and have overdone it. so flush one and just plain water the rest for a week and see if any improvement. Well; It's been 2 weeks now and things are slowly getting worse. They are coming up for their 5 week of flower now and they haven't grown an inch taller in the last 2 weeks (they are haze!!!!).

So trawling through the forums today I read a few things about testing soil runoff, I'll do a test in a few hours and post the results.

You will not get much useful information from pHing your runoff You need to determine the pH of your soil. Here's an excellent write up from another RIU member describing why runoff pH is relatively insignificant.

https://www.rollitup.org/blogs/blog17764-ph-your-tap-water-soil.html

AimAim said:

You will not get much useful information from pHing your runoff You need to determine the pH of your soil. Here's an excellent write up from another RIU member describing why runoff pH is relatively insignificant.

https://www.rollitup.org/blogs/blog17764-ph-your-tap-water-soil.html

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nice read cheers, tried both ways!