Brown spots within 24 hrs

White.Black

White.Black

Well-Known Member
Refilled the dwc, and went away for a day. Came back 24 after hrs to this.

Week 5 since flip. My second grow, never seen this before.

Ph 5.5, upping it now to 5.8. ec 1400.
Not changing water, just adding since 3 weeks ago.
 

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When i added nute water i skipped nutra micro which is the dark brown/red nute.

The nutes are a local thai clone of GH. Its called nutra micro 5-0-1.

Looking at the defficiency chart it looks like its p and k defficiency. Is that right?
 
Yep, Calcium, Potassium definitely... I wouldn't go 3 weeks in hydro without changing my reservoir, sometimes it can work but my plants always liked it better when I changed it weekly. Just adding nutes makes the ratio of Calcium, Magnesium and Potassium to be out of wack and nutrient uptake becomes harder for the plants.

So easy to fix in a (r)DWC system, just empty it and start a fresh with a fresh nutrient batch.

 
Last edited:
UndyToke said:
Yep, Calcium, Potassium definitely... I wouldn't go 3 weeks in hydro without changing my reservoir, sometimes it can work but my plants always liked it better when I changed it weekly. Just adding nutes makes the ratio of Calcium, Magnesium and Potassium to be out of wack and nutrient uptake becomes harder for the plants.

So easy to fix in a (r)DWC system, just empty it and start a fresh with a fresh nutrient batch.

Click to expand...

Thanks.

Actually the vacuum suction pump that I have broke and I ordered another one, waiting for that to arrive and then I'll change. I was initially doing i weekly, but now I found out my plant is pretty much doing ok without doing that weekly (other than the fact I didn't give her what she needs in the last feed). So every 2 to 3 weeks "seems" fine.

rkymtnman said:
got some tip burn going on too. is that recent?

and don't skip the micros again. they are just about important as the big 5 n,p,k,ca, mg
Click to expand...

Yes, the tip burn has been there before this issue, but it wasn't there in veg, it started 3 weeks in flower (now it's week 5). I had zero issues with this stuff in veg.
Reason why I skipped micro is I thought i'm overfeeding it nitrogen. My plant's root system is absolutely massive, and she drinks a lot of water/nutes, and I thought that because of that she's getting too much even though i'm putting half of what it says in the specs.

I added 1/2 of specified quantity of all three (micro, grow, bloom) and the problem seem to have stopped (the burnt tips are still there though), as in... the spots did not spread to other leaves, and in fact looks like the spots are receding on the affected leaves as well, but not sure. Didn't compare with old pics.
 
Your micro mainly contains Calcium Nitrate (both Cal and N in one), so you have to be careful about cutting it since it is also your source of Calcium. I suggest getting come Calcium Chloride and Magnesium sulfate so you can supply the plant with cal-mag without overdoing Nitrogen. (Calcium Chloride and Magnesium Sulfate are really cheap)

You should look into mixing your own nutrient solutions, you'd have supplies for years for the same price as a trio GH 1 gal bottles set. I get calcium chloride (de-icing salt) at like $25 for 25 pounds, that will last me for years, I can also use that form of calcium as a foliar spray. (33% of the weigh of it is Calcium, so in 1 liter of water, 1 gram of it is about 333ppm calcium)
 
UndyToke said:
Your micro mainly contains Calcium Nitrate (both Cal and N in one), so you have to be careful about cutting it since it is also your source of Calcium. I suggest getting come Calcium Chloride and Magnesium sulfate so you can supply the plant with cal-mag without overdoing Nitrogen. (Calcium Chloride and Magnesium Sulfate are really cheap)
Click to expand...

I'm already adding calmag, about 20ml per 2 gallons of water. This goes in with every feed, same amount... during veg and flower.

Making my own nutes is something I would be interested in. Soon I will have 10 plants in a rdwc system, so making my own would be cost effective compared to buying a product, and I can control how much of what I put in. Though, it will take some experimentation to nail down the "ingredients".
 
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