Is this a P and Mg deficiency? or???

Hi everyone, is this P and Mg deficiency? Or something else?

i have tried looking around but i cant figure it out, a yellow leaf is a yellow leaf to my eyes!

400w hps,
Plant magic soil,
Ionic grow,bloom and boost,
Ph between 6.5-7.0,
Max/min temps; 28-20 c,
Max/min RH; 65-30%
Strains are auto great white shark, 10 weeks old, and white widow, going into 3rd week 12/12

The autos had stopped growing, and as you can see there no where near ready, they are ment to be ready now!

I have given them some plant magic magne-cal+ a couple times and it didn't really help, so i gave them all a good flush and since then the autos have resumed growth but i'm still having the problems below.

They're due they're first water since the flush today, and i have prepared more plant magic magne-cal+ .... good idea?

Auto gws














white widow

U need to add a lil nitrogen .. plants use a lot of nitrogen ,, and they also use alot of mag.. this is not mag because it started at the bottom of the plant.. use Nitrogen.

Yeah looks like n def, how far into flowering are you, remember nearer the end of flowering plants dont like alot on n, so don't be feeding all the way up until chop.

Keep the ph closer to 6.5 and repot now.

its definatly N Defiency. But guys look at the leaf tips. You Have Heat Stressed them to hard, Also kinda looks like your Hps is still turned on giving harder yellow/red colour then norm.

Personaly id Fill up a big bucket of water and let it sit outside for ten mins to evap some chlorine, Then id Flush that sucker hard, Do it a few times till the water coming out is nice and white. Then Id Do some gravity shaking to drain out the rest of the water. (Lift up gently, Then Drop It hard and Near the bottem stop it hard -Shaking any excess water out). Then Make up a new Batch of water with A high N and give her and Good Soaking. Dont Feed her for a few days after this(To ensure that the roots dry out abit).

Your plant May , Due to stress or pot size become Stagnet in its growth and thus slowed down your Expected harvest time. Never Fear, Once she becomes less stressed she should flower up nicely.

Also Yes expect to lose tons of leaves to yellowing near the end of harvest

*BUDS said:

Keep the ph closer to 6.5 and repot now.

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Repot? Are you kidding. This little girl is stressed, I Dont Belive repotting now will help her At all

She just needs a good flush and a retop with nutes. And possibly lower temps

Wow! Thanks for the quick response guys! So we're saying its nitrogen? So I should give them a normal dose of grow today?

What about the widow? That is still on its veg nutes and I was planning to switch to bloom next time after todays watering

Now what do we think is causing the brown edges? today I notice the browning is spreading between the veins. Or could this just be late stage of N deficiency?

@kode the autos showed sex at 2-3 week and there 10weeks now, so 7-8 weeks I guess

@buds I do my best to keep it at 6.5 but I use universal indicator that's y I said between 6.5 and 7. I don't have any thing bigger there 15 litre pots

@shaun I just done exactly what U described With the flush a few days ago, except the last couple litres was bloom feed and it was the ww 2nd week 12/12 so it got veg feed. I don't think its heat stress because the temps at the effected areas does not exceed 22c, and the hps was off for those pics its just my crappy phones camera, they have really picked up the last few days since the flush

if its any help, My NPK are grow; 2.2 : 1.4 : 2.6
bloom; 1.4 : 1.4 : 2.6
boost; 0.0 : 13 : 14

Up the N a bit, add lots of potassium and phosphorus. /problem solved.




3rd week into flower, so any flowering nutrient deficiencies you have will begin to show now. Also, if your not feeding N (or as much as you should be since you changed to flowering), an N deficiency will also begin to show. Adding in a little N will solve that, and P and K is used up by the truckload in flowering, so add those in too. If it doesnt look better in a week, then start working with micro nutes, and trying to assure that they are present in the soil. At this point, just those 3 tho.


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yea i just saw *buds* post further up, yea dude, repot. asap. Those things are huge for those little ass pots. afterwards, worry about the nutes.

"Up the N a bit, add lots of potassium and phosphorus. /problem solved."

Right im going to give them grow with some boost and see how they do.
just pulled them out to give them there feed and found this??





this is at the top of the ww.

"Up the N a bit, add lots of potassium and phosphorus. /problem solved."



"yea i just saw *buds* post further up, yea dude, repot. asap. Those things are huge for those little ass pots. afterwards, worry about the nutes. "

i cant repot because i've no more soil, no bigger pots available and if there was i dont have much headroom, and i've just forked out for my hydro equpment so this is the last soil grow.

They're needing some water now, should I give them more feed? Or jst ph'd water?

How much boost have you given each plant? imo you're having cal/mag issues. I also think you are probably giving too much nitrogen during flowering, and not enough p-k.

hornedfrog2000 said:

How much boost have you given each plant? imo you're having cal/mag issues. I also think you are probably giving too much nitrogen during flowering, and not enough p-k.

Click to expand...

hey, they all got 3/4 strength grow and 3/4 strength boost last feed, that was the 1st boost for the widow, 3weeks and 1 day 12/12 now. not had any bloom yet.



The autos, coming up for 11 weeks, have had boost once a week with there bloom feed, both at about 1/2 strength. I do water, feed, water...ect. And the last couple of watering have had magne cal+ @1ml/l

They're needing some water now, should I give them another feed? Or jst water?