Having trouble again! I came home yesterday to some very unhappy girls. (pics below)I looked in the infamous plant "Complete guide to Sick Plants,pH, and Pest Troubles" and it looks like this is light burn, but who knows? What do you guys think? This is getting worse by the minute. So much so that I actually turned off the 600wHPS entirely and just have 3 cfl's going. Please help me figure this one out quick! So here's my setup info: 24x48x60 600w HPS w/vented hood 3 CFL's Light is 10-15 inches away from tops Cabinet and hood are each vented w/8 inch inline fan Temps are usually around 80-85. Ocean Forest Soil Dolomite lime Perlite FoxFarms Nutes, growbig, big bloom, and tiger bloom pH- 6.8 - 7.0 About my pH meter, is it normal for the needle to jump when you initially push the probe in the soil? Mine jumps to like 8 and immediately drops to 7 and then settles at about 6.8 a few seconds later. I don't know if that's normal or not since this is the only pH meter I have ever used. The plants are approximately 1 month old clones that were taken from one month old moms. I don't know if it matters, but I trying to give you as much info as possible.
Well to start yur light is too close to yur plants, especially since they are so small. Raise yur light to just over a foot, place the back of yur hand at the top of yur plants and see if it feels comfortable. If you can't comfortably keep yur hand under yur light for longer than a couple mins, then yur plants aren't going to fair any better.
the plants aren't small, they're almost 18" tall. If you're talking about that last photo, that's not my grow, that's a pic from a plant probs file that is supposed to represent light burn. Anywho, I can comfortably keep my hand 4 inches from the light due to the vented hood. Is it too many lumens for my space?
Your plant in the flower cycle? and for how long? the pic does not look like it is. And are you useing all the nutes you mentioned? Either way you dont need your 600 watt that close back it off to 24" and if you cant your plants are going to get to tall.
I agree, that is not sun burn that is nute burn you need to flush those girls and mabey even transplant
not flowering yet. I had planned to switch to 12/12 today, but not until I clear up this problem. I backed the light off last night so it's more like 20 inches away. I don't get it though. I thought you could keep a 600w relatively close if it's not producing alot of radiant heat. With the fan blowing between the light and the tops, in addition to the vented hood, it's nice and cool right under the light. Man, if I have to keep the light 2 ft away, that's going to kill me, I only have 5 ft of vertical space. take away 1 foot for the containers, 2.5 ft for the light and distance from the tops, and that leaves me only 1.5 ft for the plants, and they're that tall already before switching to 12/12. I used to be able to keep my 400w only 4-5 inches from the tops and without a problem, and that was without a vented hood. I should let you know that I also have some seedlings in that cab and they're at the same level as the affected leaves on the larger plants, but they're not having any problems whatsoever. They're uber healthy! Anywho, we'll see if backing off the light helps. If anyone else has any other ideas, let me know...it's time to explore all the possibilities.
nute burn eh...I flushed last week before the problem was as bad as it is now, and added no nutes. Do I really need to flush again? I doubt there's much of anything left in the soil at this point.
to much nutes....when did u feed her? check ph of soil and water- flush if needed then test flushed water so you know whats up in the rootzone. did u put any calcium (bone) in the soil or blood meal?
hey trill, that surprises me. I flushed last week and still the problem worsened...considerably so. I'll flush again since I need to water today anyway. I really hope this helps. This isn't like any nuteburn I've ever seen. It usually burns up at the tips and progresses inward. I did not add any bone or blood meal, in fact, I just found the paper that says exactly what I mixed up. First I mixed up The Ocean Forest soil with some Black Gold that I had left over from a previous grow at a 3 to 1 ratio. 3 parts OF to 1 part BG. Then I added about 30% perlite. 1.5tbsp dolomite lime. Dusted a bit of diatomacious earth over the top before mixing (I hate fungus gnats!) I mixed it up at that was that. On the first watering I mixed in some superthrive and that was that. The clones rooted in 1 week, planted directly into the soil with rooting hormone gel. They've been vegging now for about a month and have been pruned a couble times. All were doing great until this wednesday. I guess I'll try another flush today.
I think it looks like it might be a mag deficiency.....you could try a foliar feed with some epsom salts to see if it has any effect....I had similar probs and started using cal-mag plus and that took care of the problems...the c-m also has the micronutes that are needed....my two cents....
well if you havent fed her at all then theres no chance of nute burn- i think bubble could be right thats why i asked if you put any cal in the soil.... the cal mag is DEFFINATELY a good thing as calcium and mg are a MUST. dont flush anymore if the problem had worsened, it will only get worse- if theres no excess of nutes in the soil that rules out a burn, must be a dif somewhere- mg looks a little different with smaller spots occuring more frequently. try some powdered bone meal and a small dose of the epsom salt. see how they fair....if it doesnt get better than youve ruled out those defficincies.... good luck thsea
now that you've given alot more info, it could be that you are underfeeding. I think you should move them lights up just in case, and give em a good shot of nutrients.. Just curious but what do the bottom leaves look like? And does this effect the whole plant? Top? Middle? bottom? or a combination ? If this is affecting the plants equally then you need to feed man.. OF and BG soils are good for about a month of veg then they require a little veg ferts after that. Give them a god dose of an all round fertilizer..including micronutrients and calcium/mag..Raise them lights some and then sit back a few days and watch. Since you flushed and it got worse it tells us that you have a defficiency of some kind.
I'm going to have to side with both gump and mikey it could be either mag deff or underfeeding. But i'm kinda thinking underfeeding cause if you got a mag deff you also got a phos def creeping up those stalks i can see purple in the main stalk and thats for sure deff.
