Maganese Defiency or pH lockout? (not sure)

[Guest]

Hey guys, I have looked around at other pics and the guide to sick plants, but I haven't been able to find something that looks just like what I have so I figured that I would ask. I just noticed this areas on my bottom leaves of 1 plant. The leaves on the bottom are also a little droopy. I kept them in Veg under 400w MH light for 7.5 weeks.

I am growing Oasis feminized plants from Dutch Passion in Sta-green soil w/ perlite. This is Day 6 of 12/12. I transplanted them 4 days ago into 5 gallon buckets w/ added organic soil and 1 tablespoon of dolomite lime. I watered them 2 days ago w/ distilled water and 1/2 strength Tiger Bloom with Liquid Karma (1st time using Tiger Bloom). Before that, the past week I was using just distilled water. The pH (tested w/ the dropper solution) was 5-6 range and it seemed like the run off pH was in the low 6's, but hard to tell b/c the run off had a brown tint to it, I guess from the Liquid Karma so it could affect the color of the pH detector (I am not very sure). Here are some pics.

Can yall let me know what you think and how to fix this problem. I ordered a digital pH pen and it should be in the next few days. Thanks for all your advice.

 

[MTF-Sandman]

Can't really tell by those pics...is there any chance you could turn off the HPS and use a flash to get a better color representation of the problems? Also a pic of the entire plant would help...but I seriously doubt it's a manganese def either way - they are pretty rare.

What's the NPK of the sta-green you have and what have you fed them until this point?

How often are you watering and what's the water source?

The more details you can provide about the environment, the more accurate your responses are likely to be...

 

[Guest]

I am positive thats not a manganese def. From the pic of the leaf it looks like a over watering issue but I cant be sure. A pic of the whole plant with the hps off would make it a lot easier to help you. What kind of ventalition you got? Better pics and you will get help.

 

[10k]

Just an off the top of my head remark based on what little information you've provided so far...
You mentioned having transplanted them four days ago, and feeding them bloom ferts two days ago, yet this is only day six of 12/12.
It's never advisable to slam them with bloom ferts immediatly into 12/12 lighting. Bloom ferts arent what triggers flowering ya know. You should have stayed with what you veged them on for that first 7.5 weeks for about the first two weeks of 12/12 before switching to bloominmg ferts.

I totally agree with the sandman...

The more details you can provide about the environment, the more accurate your responses are likely to be

Off topic note for our frequent advice givers in the infirmary:
Speaking of which, will the readers please help put together a consensus on what we'd like to see included in sick plants threads. One for soil and one for hydro grows.
See this thread and post your ideas to it...
http://www.icmag.com/ic/showthread.php?t=46280

 

[10k]

ANNNND "holy cow darkrider" ...7.5 weeks vegging under 400 watts ?

 

[Guest]

Guys, this is my first grow. I vegged them until they started to have alternating nodes and then put them in 12/12 cycle. They were under the MH light for the last 5 weeks, before that they were under 40w 4 ft fluoro lights. I couldn't find the NPK of the soil, but I think that it is 0.13-0.04-0.09.

I water them with distilled water bought from the store every 3-4 days w/ nutes. I give just water every 3rd watering.

I have 2 fans on them and the temperature is around 78 F, it's as low as I could get in my room. Here are some pics with the lights off. Sorry I couldn't get the pics any better.

 

[MTF-Sandman]

It could to be a mag lockout, but it doesn't look like the typical PH lockout. Is it possible something was spilled/splashed on the leaves and burnt them a little?

 

[10k]

I water them with distilled water bought from the store every 3-4 days w/ nutes. I give just water every 3rd watering.

With WHAT nutes did you veg them (you still havent mentioned) ?

I really don't see much of a problem there darkrider64, it's actually pretty nice looking for a first time grow, although that it's kinda stunted size wise for a two month old.

The leaf problem looks like it could have been pH related, (your range you mentioned for the nutes going in of 5 - 6) is a bit on the low side, it should be more like 6.5'ish.

But anyway, I'd stay with a vegging nute for the next week or two, before moving to the tiger bloom. Plus they'll not be needing watering anywhere near that often now that they're in the 5 gallon buckets...so if you arent doing it already, learn to judge when to water by how heavy (or light) the bucket feels rather than going by the looks and feel of the top of the soil or finger test.

 

[Guest]

I don't think it's possible that anything got spilled on them. I am pretty careful around them and don't have anything in my room that could have spilled on them.

I was using MG nutes 15-30-15 (I thought it was 20-20-20) and I do use the finger in soil test and pot lifting to determine when to water.

Thanks for the replies

 

[Guest]

Your plant looks pretty good probably with better veg nutes you might see a better(larger) plant...

Miracle grow has no magnesium in it...

While you applied some dolomitic lime(source of magnesium) to your soil your plant may need more...

I consider the first set or two leaves expendable(less than 5 fingered leaves)... and if the plant is doing well I chalk it up to old age (of those leaves)

But the leaf is showing some signs of magnesium deficiency... not only do you have the obvious spots but you can see some interveinal ghosting... the beginning of interveinal cholorosis....

Its certainly not bad and you can address this with a bit more dolomite in your soil or add a bit of epsons salts now and then....

Or get a veg fert than contains magnesium (Mg).....

 

[Neptune]

if you are growing in promix, it comes bagged at 1000ppm.

you should flush it.