Still fighting Yellow w/brown spots

Well guys, i'm not sure about weed, just asking.
By the way, two of my friends with Phd in Botanic said that. But guess that's for their regular plants.
Nevermind! :)

Totally too soft source water. You MUST add calmag up to 250 ppm, and THEN use a coco nute. That's calcium def right there. If your nute is not a coco nute, add it up to 300ppm instead. Coco scavenges calcium.
Also, with coco + perlite, it is super hard to over water. But in grow bags, it is hard to do the lift test- you should not get in the habit of moving grow bags around! They jostle the roots and can damage them.

Plants are in start of second week of flower, strain unknown. Veged for 4 days.



Indoor
1000W HPS 15" from canopy.
300CFM exhaust @ 200 CFM intake from outside air.
Co2 @ 1200 PPM
Day temp 78f
Night temp 68f

Humidty is 40% but I don't know if I trust the cheap meter.

Well wtr @ 5.6 ph and ppm @ 25

Dutch Masters "grow" 1 tbs A+B per gallon
1 tbs H202 pr/gal
1/2 tsp potash pr/gal
1/2 tsp CalMag pr/gal

Total PPM @ 980

Run off @ 6.0 ph and 480 PPM

Any ideas? Out of 16 plants 11 are starting to show signs. Thanks peeps

If i were to guess I would say it looks like nute burn

Soil? Is water being splashed on the leaves? Kind of looks like that could be your problem but I can't give a definite with the info you gave. Is it on the lower leaves or all of them? New growth or old growth? Does look like nute burn of some kind.

Quote:

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Originally Posted by tip302327

..... Veged for 4 days.

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could be a problem

Could, if anything they could be too young for the nute doses.

It is on the older leaves. I have be using a 1/4 strength Liquid Light
right when the lights come on. I noticed the pic isnt that good but
if I open it with windows viewer and increase image size it is
very apparent. The plants over all look to be Light on "N" but I have burned the crap out of plants before using Dutch Masters so Im going slow this time
tring to find out what this strain likes. Out side of the discolor and spots, all 16 plants are growing at a freak rate and tops are standing straight up like they are very happy. Still i think this is just going to progress worse if I cant figure out what they need or dont need anymore of..

Thanks everyone for the feed back. Stinky, can you direct me on the 250-300ppm CalMag? Should I subtrack my 25 PPM water from the total 250 PPM? And should I just water with the CalMag or add it to my next feed? I may have errored because I flushed when I first noticed a problem and water logged the plants. I have found that when using grow bags, if you dont set them on something, "I use Perlite" the bags dont seem to drain completly very well. I have heard it is impossible to over water using coco/perlite but have found this to not be true completly with younger plants and flushing heavy. Thinking back to my last grow, I added fine lime to the coco and did not have this problem. These plants are from the last grow, clones. I read somewhere that it is not necessary to add ammements to Coco when using full spectrum fertz. This is the second grow on this batch of Coco. I flushed the used coco with water until my runoff PPM was below 50 and then cooked it in black plastic bags in the sun. Seems to all point to a cal def. I will post the outcome for future reference to others. Thanks so much for all your imput. t

Start with your 25ppm tap water. Gradually add calmag until the ppm of the solution reads 300. Then proceed as normal- use this water if you are doing a water-only feeding or adding nutes to it.
Set the bags on a grate like a cookie drying rack and slit some more holes in them if they drain crappily.
Lime in the coco worked last time because it added enough minerals to make up for your soft water.
Don't consider CalMAg an 'amendment' or 'supplement'. It is easier to think of it as 'concentrated awesome plant water'! It gives you the ability to make a water that is exactly right to form the base for any other nutes you use. Like if you want to make a cup of hot cocoa with just powdered cocoa, but you only have water, well first you have to add powdered milk to the water or it's not going to taste right. The CalMAg is like the fertilizer equivalent of the powdered milk. Once you have reconstituted milk, you can make hot cocoa or cereal or just drink it. Once you have reconstituted plant water, you can add grow fert, or bloom fert, or just give it to your plants. Get it? Coo. :cool: