HELP!! Multiple micronutrient def. Nutrients not helping. Stable PH (PICS)

myscrizzlenizzle

Active Member

  • I am growing indoors under a 400 watt HID MH. I am growing from clones and am about 4 weeks into my grow cycle. I am using Roots Organics Soiless Mixture which is basically a 50/50 perlite and coco mix with supplements like kelp and humic acid to promote grow. Plants were under 4 25W 6000k CFL for first 2 weeks. No nutrients, but plants show no deficiencies, i assumed it was getting fed from soil/soiless mix it came in. At week 2 i transplant into 3 gallon pots and put under 400watt MH with a 24/0 grow cycle. I obviously was stupid for waiting 2 weeks into my grow to order nutrients and plants were showing major magnesium and potassium deficiency so i supplemented with 1 tbsp epsom salt per gallon water and 1/4 strength shultz 10-15-10. Plants seemed to be slowly getting better, but by week 3 they were showing major signs of micronutrient defiencies. Each plant is a different strain and each seems to be suffering from a different deficiency. I started Roots Organics nutrient line which includes Buddha Grow, Extreme Serene (Kelp), Ancient Amber (Humic Acid), Trinity (Carbs and Molasses), and Oregonism XL (mycorrhizzea for roots) and fed as instructed by their grow chart. Plants are showing little improvement. I recently got General Organics Biothrive Grow (which has all the micronutrients Roots Organics is missing) and camg+. Week 4 i replaced Buddha Grow for Biothrive Grow and added Camg+ at 10ml/L. That was yesterday and the plants are improving, but still look like shit. I'm used to having lush green plants and i'm assuming an iron deficiency is making them all yellow. The iron in biothrive grow is from iron sulphate and is not cheolated so i know that it will take longer, but am commited to remaining organic. Today i foliar fed with some humic acid and camg+ at 1/4tsp/L. I am tempted to buy Revive from advanced hydroponics but really don't want to resort to that. I have a ph reader that gives me a reading around a high 5 low 6 but mind you it is one of those cheaper ones that you stick in the soil. I am a not a rookie, but this is my first time not using any soil whatsoever in my mix. Obviously i was not prepared for the microdef's that were to ensue. I would extremely appreciate a way to save my girls. They are a month old now and half the size i would like them to be. I am using hard water at around 10 ppm.

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autobahn101

Member
I see this all too often. I would invest in some good meters which are essential to successful growing - ph, moister, nutrient meters are very necessary. If you're guessing, chances are that other on the forum will guess with you and you don't want that...you want to know what's happening. I could tell you all day long your plants need more water and or nutrients; or better yet your lights are not the proper and still be guessing and you could ruin your crop! Get some good equipment to assist you. That is what I do and it works wonders.
 

myscrizzlenizzle

Active Member
I know that if i had a ppm meter i could know exactly how much nutrients there are. That being said if i can't afford a ppm meter right now, but i can afford a more accurate ph reader. Are you suggesting that i'm experiencing a PH lockout? I did not notice any signs of spotting, but then again i'm not an expert.
 

ataxia

Well-Known Member
i'm not experienced with soiless but i see it all the time in soil. i say maybe a ph problem ...if you say the medium is at a 5- low 6 range i'd bring it up a little. i'd keep it in the low to mid 6.
also ....is the coco rinsed in the medium before hand??? i used plain roots organic but never the soiless.
sounds like your feeding them alot, but then again ...i'm not experienced in soiless ... but the problems you're having look like text book iron, magnesium, cacium problems ...i
say bring the ph up a tad bit, and make sure you're getting a good reading on it .... fuck it ma man ..it's your first time without dirt you'll figure this shit out...
 

R3dima

Active Member
I use soiless... for my moms and I have run into similar situations. most likely its the trace minerals... try some distilled water and then add in just some cal-mag or something alike...slowly start to bring in the grow nutes back... watch your watering...don't go overboard wait to see if the top is somewhat dry and then water! Should help a lot.. And I said cal-mag cause I like to stick to organics! Better chance of not causing more issues especially since you don't have a meter!. But got to home depot and get at least a cheap soil meter for now...only like $15...Good Luck
 

Tmac4302

Well-Known Member
I've noticed that less is more in a soiless medium. First time I went to soiless, I wayyyyy over fed thinking its the same as soil feeding. Boy was I wrong. There aren't any buffers tht soil has in the medium to allow a proportionally heavy feeding. Flush your medium with 3x the amount of pH water as your pot contains and start in at 1/4 strength feeding. Like you said, your not a noob so just read what your plants are wanting after the 1/4 strength and go from there. Good luck man!
 

420Trix

Member
Good morning. I have had horrible luck with those prong Ph meters but if it is saying low 6 high 5 that is the range for hydro, not soil hun. For soil it is more like 6.8
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Dolomite lime added will buffer Ph quickly. While bonemeal, crushed oyster shells, hardwood ashes are all good ways to raise pH slowly
 

myscrizzlenizzle

Active Member
Thanks for all your responses. I ended up just leaching out the medium and feeding 1/3 strength, using camg+ at regular strength. With coco and organic especially, should i have fed with a full strength because of the severe nutrient defs? I had heard that coco was naturally a good buffer and tended to keep PH around a 6, but if this is a nute lockout problem then i am beginning to think that is incorrect.
 
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