So this is my second grow im using 2 platinum led p300 to grow. Im using elite nutrients was feeding half reccomended feed in soil last week started full strangth. Im growing 4 different strains lsd, purple haze, blue dream, and liberty haze. Lights are 22" above the plants. The lsd and purple haze are showing signs of what looks like mag deficiency at the top of the plants and showing no signs of deficiency at the bottom. The blue dream and liberty haze show no issues. I will post some pictures does anyone have any recommendations?
Light burn/ deficiency
- Thread starter Mcdrichj
- Start date
Plutonium
Well-Known Member
That looks like a Maganese deficiency to me, not Magnesium.
Manganese deficiency can be easy to spot in plants because, much like magnesium deficiency, the leaves start to turn yellow and undergo interveinal chlorosis. The difference between these two is that the younger leaves near the top of the plant show symptoms first because manganese is not mobile, while in magnesium deficiency show symptoms in older leaves near the bottom of the plant.
Most likely caused by your soil Ph being to high, If the soil pH is not a problem and there is no manganese actually in the soil then foliar feeding is the most common way to get manganese into the plant.
Try dropping your soil Ph to around 6.2 or foliar feeding your plant with a fertilizer that is highly soluble in water and has plenty of manganese in it. The fertilizer you choose can be a hydro micro, a unique Fe-Zn-Mn fertilizer, or also a manganese chelate.
Then again, I wouldn't spray fertilizer directly onto any flowering sites.
Manganese deficiency can be easy to spot in plants because, much like magnesium deficiency, the leaves start to turn yellow and undergo interveinal chlorosis. The difference between these two is that the younger leaves near the top of the plant show symptoms first because manganese is not mobile, while in magnesium deficiency show symptoms in older leaves near the bottom of the plant.
Most likely caused by your soil Ph being to high, If the soil pH is not a problem and there is no manganese actually in the soil then foliar feeding is the most common way to get manganese into the plant.
Try dropping your soil Ph to around 6.2 or foliar feeding your plant with a fertilizer that is highly soluble in water and has plenty of manganese in it. The fertilizer you choose can be a hydro micro, a unique Fe-Zn-Mn fertilizer, or also a manganese chelate.
Then again, I wouldn't spray fertilizer directly onto any flowering sites.
Thanks for the reply I will check my ph tomorrow when the lights are on and see what I can find at the store.
Plutonium
Well-Known Member
That's to high and no doubt the root of your problem.
So I ph'd my water down to 5.5 for this water to try and knock the ph down. The ph of the run off was 6.3.
My question is what should I ph my water to at this point and in the future?
Plutonium
Well-Known Member
Now you went to low, 5.5 is for hydroponics. Around 6.2 is perfect for soil. As the plants absorb nutrients your Ph will slowly climb, allowing for the plant to utilize different nutrients. What you have to understand is, plants absorb different nutrients at different PH levels. As long as you are using a proper nutrient base, 6.2 will allow your plants to thrive and utilize all the different elements.
BobCajun
Well-Known Member
That brand of nutes has chelated micronutrients, so manganese shouldn't get locked out even if pH is not optimum. It's a complete hydro fert so shouldn't be any deficiencies. I would think it's more likely something like over watering, bugs or fungus. If bugs are eating the roots it would effect the leaves if it got bad enough. Fungus gnats are bad for that. As long as you always water to runoff it shouldn't be nutrient toxicity but might be good to check the runoff for ppm level just to see what it is. Shouldn't be more than about 1500 tops, 1000-1300 even better.
Watering a drain to waste system should use nute concentration of about 500-750 ppm. The runoff will be higher, in mine it comes out 1000-1500, depending how much excess water I use. There may also have been some nutes in the soil to start with, so that may have put the concentration too high. You usually use that type of ferts with soilless mediums, though the page says hydro and "traditional".
Watering a drain to waste system should use nute concentration of about 500-750 ppm. The runoff will be higher, in mine it comes out 1000-1500, depending how much excess water I use. There may also have been some nutes in the soil to start with, so that may have put the concentration too high. You usually use that type of ferts with soilless mediums, though the page says hydro and "traditional".
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