Sick Plants In Hydro

[theweedguru]

The Ph may be a little low I think, it's around 5.6, I was wondering the best and easiest way to raise it a little.
Whats wrong with my plants is that the younger ones are getting some bright yellow leaves, then turning brown kinda spotted brown....and the older plants, some of the leaves are turning dark dark green, then to brown, and curling upwards towards the tips. The older plants are about 4 weeks of veg, and the younger ones are in 2nd week of veg.......What could be the problem? And maybe the most economical and effective solution?

[theweedguru]

ive been reading around, and it looks like it would be a magnesium deficiency.....it says I can fix it with epsom salt, 1tsp/gallon in my hydro setup. Will the epsom salt raise, or lower my Ph? I would like to raise it to about 6.0, and I am looking for an easy way to do it, very economically.

Thanks

[ChilliWilly]

Originally Posted by theweedguru

ive been reading around, and it looks like it would be a magnesium deficiency.....it says I can fix it with epsom salt, 1tsp/gallon in my hydro setup. Will the epsom salt raise, or lower my Ph? I would like to raise it to about 6.0, and I am looking for an easy way to do it, very economically.

Thanks

ph 5.6 is ok but I would keep it 5.8-6. You coul add tap water if it's alkaline, or use ph up, or potassium silicate. If you can post a pic it would help. What nutes/ec are they on?

[theweedguru]

Dyna-Gro 7-9-5 for the nutes. I will have pics sometime soon, I need to find my camera, lost it, lol....Would the epsom salt raise the ph do you know?

[ChilliWilly]

Originally Posted by theweedguru

Dyna-Gro 7-9-5 for the nutes. I will have pics sometime soon, I need to find my camera, lost it, lol....Would the epsom salt raise the ph do you know?

epsom salts don't affect ph, but raise the ec. Without pics I'm not sure, but it might be a matter of adjusting nutrient strength. I haven't heard of Dyna-gro - is that a hydro formula?

[theweedguru]

Yeah, its a hydro formula. I got some magnesium sulfate today too, havent used it, waiting for a definite diagnoses, im going to get some pictures right now.

[theweedguru]

Here are some pics. temp is constant 28 C, 24/0 light cycle, Dyna-Gro 7-9-5 hydro formula. Ph is 6.0, I check it 2 times a per day. Maybe a deficiency?

[theweedguru]

Originally Posted by ChilliWilly

epsom salts don't affect ph, but raise the ec. Without pics I'm not sure, but it might be a matter of adjusting nutrient strength. I haven't heard of Dyna-gro - is that a hydro formula?

Btw, what is EC? Im sort of a noob

[theweedguru]

can anyone tell me whats wrong by looking at my pictures?

[ChilliWilly]

Originally Posted by theweedguru

Btw, what is EC? Im sort of a noob

sorry, ec = electrical conductivity, ec meter is what you measure he strength of the nutrient solution, if you don't have one you have to judge the strength by measuring carefully, going by the nutrient instructions, and looking at the plants. What guide did you go by making up the nutrients?
Looking at the npk of the feed, it looks a bit strange for grow formula, too high in P, a bit low in K?
There is some stripey leaf on the latest pics which looks like Mg, but I think there might be a few problems, so maybe increasing the feed strength would be better than epsom salts - you can cause more problems if you overdo them. Just a bit nervous about upping the strength without knowing how strong they are already?

<edit> looking at them, it could be K def, like my problems, which would make sense if there is low K in the food, and the nutes are weak, it would be the first deficiency to show. for grow, i'd expect the npk more like 5-2-6 (ionic grow). maybe you should try a different brand grow feed?

[smokingaces]

im having a similiar prob. i use chem feed too.however i use general hydroponics formula. its deffinetly nutrient related. i believe it is nitrogen overdose. im fixing mine by diluting the current hydro bath.

[theweedguru]

This is the nutrient formula. I have 17 gallons of water, I added 3oz of this formula:
Total Nitrogen: 7%
-2.6% Ammoniacal Nitrogen
-4.4% Nitrate Nitrogen

Available Phosphate (P2O5) - 9%
Soluble Potash (K2O) - 5%
Calcium (Ca) - 2%
Magnesium (Mg) - .5%
-.5% Water soluble Magnesium
Boron (B) - .02%
Chlorine (Cl) - .1%
Cobalt (Co) - .0015%
Copper (Cu) - .05%
- .05% Chelated Copper
Iron (Fe) - .1%
Manganese (Mn) - .05%
-.05% Chelated Manganese
Molybdenum (Mo) - .0009%
Sodium (Na) - .1%
Zinc (Zn) - .05%
-.05% Chelated Zinc

[ChilliWilly]

too stoned to do the maths, but that works out to 1ml in 1l (1oz=30ml?) which seems weak. going by the npk you'd use 1/2 as much roughly compared to ionic grow for the same N level. ionic full strength is 7ml/l, so maybe 3ml/l for yours? full strenth is pretty much top of the scale for late veg, you might start at 1/4 then increase it to 1/2 gradually increasing to full strength.
My suggestion is to increase to 4-4.5 oz per res ("half strength" by my reckoning), and see if that improves matters.
I read the thread again and the symptoms sound just like my problem with K def, see here (wasn't the thrips after all!)
http://forum.grasscity.com/sick-plan...-must-die.html

[theweedguru]

ok, i added 30ML of nutes to the res, lets see how this does, hope it fixes the problem
thanks

[smokingaces]

i still think you are using too much chemicals. i am using aprox the same amount of feed however i only got 14 gallons and my nitrogen is 2% of the formula.
maybe this can help you?
http://www.marijuana-seeds.net/Thanks-ThankYou.htm