Nitrogen def or tox? Megacrop

I'm getting frustrated. I hate coming here and asking questions because generally I can figure these things out of my own but this one's pissing me off. Started lightening up in color and i think I'm having nitrogen deficiency.

I'm using megacrop with kelp, sweet candy, bud explosion.

I had cut the megacrop way down and was just using the bud explosion with everything else and then started showing this.

I've then cut off the bud explosion and have gone back to full strength megacrop in this shit is still going on.

I'm about to take all this megacrop and throw it in the trash can cuz this is happening to me every time I grow and get to about this stage in flower with this fucking megacrop.

And generally I'm someone who gives half strength nutes because that's usually about all it needs is 50%.

Then all of a sudden whether I give more or less it keeps doing this shit. Every damn time, whether it's soil or Hydro I'm having trouble with this crap.

Deficiency. Leaves normally burn at the tips claw at the ends and have a very dark green sheen to them if it's toxicity.

Could be locking out nitrogen amongst various things.

What's your TDS and pH levels?

PopeyeSpinach said:

I'm getting frustrated. I hate coming here and asking questions because generally I can figure these things out of my own but this one's pissing me off. Started lightening up in color and i think I'm having nitrogen deficiency.

I'm using megacrop with kelp, sweet candy, bud explosion.

I had cut the megacrop way down and was just using the bud explosion with everything else and then started showing this.

I've then cut off the bud explosion and have gone back to full strength megacrop in this shit is still going on.

I'm about to take all this megacrop and throw it in the trash can cuz this is happening to me every time I grow and get to about this stage in flower with this fucking megacrop.

And generally I'm someone who gives half strength nutes because that's usually about all it needs is 50%.

Then all of a sudden whether I give more or less it keeps doing this shit. Every damn time, whether it's soil or Hydro I'm having trouble with this crap.

Click to expand...

give it full if they want it more raise it. they are cannibal

Nutrient antagonism locking out N caused by extreme overuse of K. It doesn't matter what nutrient you use. If you feed that much K you're going to have issues.

Look at what you've been feeding your plants and then look at the charts below.

Mega Crop
9-6-17 or 5-12-26

Bud Explosion
0-19-39

Sweet Candy
0-0-16

Sea-K
0-0-15

It believe it’s nute lockout might need more nitrogen. Quick question tho I noticed you have yellow spots on your plant I also due and have been dealing with that issue is that leaf septoria or from something else check out my thread tell me what you think

Plant looks pretty good! Dont give up.

Boom! @xtsho nails it...again.
Excess K kills. Espec. Coco.



Get some new 2part MC.

Or Jacks 2part.
Or Masterblend 2part.
Virtually identical and you are more in control.

My 2c

Thanks everyone.
Xtsho thanks, made me understand something that's taken me about two years to figure out now...

I have had this problem every go but I've had it indoors under my Quantum boards and I've been able to get through it. But now that I'm outside in the sun it's really kicking my plants down. (First time outside)

Thankfully i took clones of these girls so I can have a round two.

These are in 5 gallon smarts, i have 15 gallon smarts showing up tomorrow. I wanted to go bigger but until I get a greenhouse I'm not trying to pick up and move any pots around the yard more than 15 gallons.

Again, thanks for the advice.

I gave them some Advanced Nutrients sensi bloom and overdrive this evening (before I had seen any of these replies) haven't had much time or willpower to do anything else since I've been sick as hell with a summer cold since Tuesday.

PopeyeSpinach said:

These are in 5 gallon smarts, i have smarts showing up tomorrow. I wanted to go bigger but until I get a greenhouse I'm not trying to pick up and move any pots around the yard more than 15 gallons.

Click to expand...

I agree with K locking out N.
I also agree that's a pretty big girl for a 5 gal.
I'd suspect that has an influence on your troubles.

Bro run some gypsum, aminos, humate through your substrate

I'm probably not going to be able to pick anything up until sometime next week.

So I can only work with what I have. Which is either megacrop or some Advanced Nutrients.

Would flushing out three gallons of plain per pot and then refeed with sensi bloom be helpful?

If you look closely on the bud explosion
You are only supposed to use a few granules for a 5 gallon bucket of water
My best guess that is the product that locked you out
I barely use it till the last four weeks

Ok these pics were taken tonight (Saturday)

Thursday night i started to flush, put 2 gallons through each pot and went to bed, got up Fri morning and put 3 more gallons through each pot, 15 gallons total.


Then refed with AN Sensi bloom at about 3/4 strength.

Im thinking they look better, but they are still hungry, especially the big bitch in the middle

What do you guys think? I have a bit of a color blind deficiency and I have trouble with tones of green, don't always trust my eyes on these things. Kind of sucks but oh well

I also moved them down into my lower yard where they don't get quite as much direct sunlight throughout the day but still good amount.

Some of the older growth might not get better but keep an eye on the newer growth. But I just noticed that those are auto's and flowering so there probably won't be much more foliage growth.

so im running into the same issue using megacrop... i know there are a ton of variables but im new to growing and not sure how to calculate ppm, ec and all of that stuff. ive been running ff/of/perlite mix and feeding with megacrop and my plants look like this. about 5g of megacrop every other watering, 1gallon of water every 3 days. was only happening to one of my plants now its happening to the second. i think it could be a nitrogen, calcium, or mg deficiency?? looking and reading information i feel like it could be any of those without knowing an absolute ton about growing. i just got some calmag since alot of ppl suggested pairing it with megacrop and needing it so i am trying to add 1g of calmag now to see if that helps things

They arent autos, but I do have them flowering.

The one with the white plastic tied to the handle is Power Africa, the other two are Durban Poison.

TintEastwood said:

Plant looks pretty good! Dont give up.

Boom! @xtsho nails it...again.
Excess K kills. Espec. Coco.

View attachment 4585728

Get some new 2part MC.

Or Jacks 2part.
Or Masterblend 2part.
Virtually identical and you are more in control.

My 2c

Click to expand...

where you get that spreadsheet? Wanna share?

daadank said:

where you get that spreadsheet? Wanna share?

Click to expand...

Sure. Which spreadsheet?

xtsho said:

Nutrient antagonism locking out N caused by extreme overuse of K. It doesn't matter what nutrient you use. If you feed that much K you're going to have issues.

Look at what you've been feeding your plants and then look at the charts below.

Mega Crop
9-6-17 or 5-12-26

Bud Explosion
0-19-39

Sweet Candy
0-0-16

Sea-K
0-0-15

Click to expand...

Incorrect. There is no issues with mag and calcium which would suggest potassium overload . Although 1 part megacrop is more suited to flower , the issue is a simple nitrogen def . Megacrop is fairly low in nitrogen . I’d change my nutrients to a 15-9-9 for veg and use megacrop for flowering

Mix MEGACROP with some additional N such as fish emulsion 5-1-1 for a cheap simple "balance fix". 1 TBS per gallon and MEGACROP at half strength if needed.