Please help :)

[freshy101]

Any help would be truly appreaciated!

Problem: Brown spots and yellowing, slight white mould developing on top of medium + spotted a few gnats.

Medium/grow method: 70% soil 30% coco in Autopots

Feed: and supplements used: 0.7 EC of Megacrop added to 0.4 EC tap water to make 1.1 EC (the recommended normal veg dose) - not sure what version of megacrop but photo attached

water source: 0.4 EC tap water, 7.4 pH ( I pH down to 6.3-6.5 for feeding)

Strain/age: Gelato fem 38 days from seedling

light used: 2000W LED (395 real watts)

Climate: 23-26c, 55% RH

Additional info: Running two strains (gelato + grand daddy bruce) the grand daddy seems to be fine, is a fair bit greener and doesnt have any brown spots, both strains running off the same res (probs not the greatest idea) I have calmag available if need be.

Kindest regards,

Freshy

 

[KonopCh]

Patches looks like Ca deficiency, you also have some yellowing between veins which is probably Mg deficiency. Watch your pH and get little more those elements.
With LEDs you must run slightly hotter environment, 27-30°C is ideal, also don't forget to tweak RH a bit.

 

[freshy101]

Patches looks like Ca deficiency, you also have some yellowing between veins which is probably Mg deficiency. Watch your pH and get little more those elements.
With LEDs you must run slightly hotter environment, 27-30°C is ideal, also don't forget to tweak RH a bit.

Thanks mate, should I do a calmag foliar spray?

 

[freshy101]

Actually I'm almost due topping up the res, should I just add calmag to that? Or is it urgent enough to give it a foliage spray

 

[KonopCh]

Me personaly don't like foliar spraying plants.
If you do it, you should do it right after "lights on" or right after "lights out".

 

[Waira]

How close are the lights? She looks maybe a little cooked on top,.... Coco might also be binding up some of the Ca, and together it might be causing the symptoms,... Ca is the best fit, but P defc. can start out looking similar... add more Ca-Mg in the res', and let's see if it halts...

 

[freshy101]

How close are the lights? She looks maybe a little cooked on top,.... Coco might also be binding up some of the Ca, and together it might be causing the symptoms,... Ca is the best fit, but P defc. can start out looking similar... add more Ca-Mg in the res', and let's see if it halts...

The light is sitting at 24" above the plants, the manufacturer suggested that's the perfect height for veg, its a 2000W LED (395 real watts) I just put it up an inch and a half to see if that helps, also added 2.5ml calmag to a 5 gal mix for the res, is that a sufficient enough amount at this point or should I be adding a lot more.

Base nutrient is Megacrop 1.0

Thanks heaps for your help