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Possible magnesium deficiency. Need a second Opinion. *with pictures

OvergrowingKiwi

OvergrowingKiwi

Active member
What STRAIN are you growing? Nirvana Northen Lights x Shiva
What was the establishing technique? (Were the seed or clone?) Clone
What is the age of your plants? 30 days since rooted.
What PHASE are the plants in? (seedling, vegetative or flower) are the plants in? Vege
What Technique are you using? NFT 24/7 20 litre res
What substrate/medium are you using?(Hydroton, RockWool etc.) Hydrotron
What is the Nutrient temperature? 20.2C
What Nutrient's are you using? Local Hydro store 2 part vege & bloom
What is the TDS/EC/PPM you are using? 1.45EC
What is the pH of the "Tank"? 6-6.2
Are you sure your calibration is correct on your equiptment? Yes
When was your last watering? Today Plain PHed Tap water topup
When was your last feeding change? (ie. grow-bloom-micro-additional) I start off full strength and top up with phed tap water every day Half strength nutes every 2nd day. Dump every 10 days
What size bulb are you using? 400w HPS tube
What is the distance to the canopy? 1.5Feet
What is your RH Factor? Not Known - Getting humidity meter tomorrow.
What is the canopy temperature? 70F
What is the Day/Night Temp? (Include flucutaion range) -+5F
What is the current Air Flow? (cfm etc.) Adequate
Is the fan blowing directly at plants? yes
Is your water HARD or SOFT? .10 EC unsure on what is classified as hard.
Has plant been recently pruned, cloned off of or pinched no
Have any pest chemicals been used? If so, What and When?
Are plant's infected with pest's no
Click to expand...


Hey guys :) First off thanks for clicking my thread. Over the last week I've noticed what I think is magnesium deficiency. Heres a few things I've noticed.

  • Middle age to older leaves effected.
  • Was happening before resent reservoir change and has continued to get worse.
  • Doesn't seem to be causing full necrosis yet
  • Growth speed has been normal new growth looks healthy

First thing I did was add 1tbs a gallon of epson salts to the res and foliar fed them a mix of 1tbs/quart epsons salts. That was yesterday. Am I on the right track?

Heres some pics...I've removed some of the worse effected leaves.

picture.php


starts off like this..

picture.php


picture.php


causing mutation here
picture.php


Feedback appreciated.
 
S

smoketrichs

Member
My leaves are exhibiting these exact signs as well! I was about to make a thread on it. I'm using PBP soil formula and calmag+ on approximation of Lucas formula (15ml, 5ml/gal ro water respectively). Was feeding at half str, guess I'll ry upping the dose. Soil btw.
 
J

JohnnyHopkins

Member
It definitly wouldnt be heat stress based on the information given.... You should start pruning the stuff off the bottom as the light doesnt go far past the scrog net..... are you going to tie your tops down to the nets or r u just using the nets for support for it to grow through? Either way they should be pruned up :) Oh and if the ph is 6.0-6.2 I would lower it to 5.6-5.8. High!
 
H

HydroJen

Member
For soilless medias, I have better luck with pH 5.5-5.9

I developed similar look, added feeding (from1x to2x/day), greening up fast.
 
OvergrowingKiwi

OvergrowingKiwi

Active member
  • PH EC
  • 6.1 .75
  • 6.3 .63
  • 6.4 .60
  • 6.4 .56
  • 6.2 1.14 - Reservoir changed
  • 6.3 .88
  • 6.4 .82
  • 6.5 .60
  • 6.3 .69
  • 6.0 .63
  • 5.7 .60
  • 6.1 .62
  • 6.2 .60
  • 6.7 .74
  • 6.6 .77
  • 6.2 1.11 - Added 2 1/3 Tbs epson salts
  • 6.2 1.47
  • 5.8 .95 - Reservoir changed - Half strength + micro
  • 6.4 1.19 PH lowered to 5.8 with Ph Down caused EC to rise .30!! - Topped up 4L plain water
  • 5.8 1.10 Topped up 4L 1/2 strength grow & 1/2 strength micro EC and PH dropped 5.7 1.05

Thanks for the advice guys above are my readings up until today and what I've done to correct it. It's looking very much like a lockout caused by high ph/too much N..

Will definitely be giving them a trim below the screen. Will keep you guys posted. They have generally been looking healthier the last couple of days. Again thanks for the input.
 
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