Nitrogen or Sulfur deficiency?

Hi,

my plants have plenty of yellow leafes.

What kind of deficiency do they seem to have?

I checked abuse charts and it looks either like a nitrogen or sulfur deficiency to me.

The leaf stems are purple.

Please check attached picture.

I hope you can help me.




Here a high res picture:

first ........... S deficiency displays itself as yellowing starting from the base of the leaf (where peptole and blades meet) and progress towards the tips of the blades.
N deficiency displays itself as yellowing starting from he tips of the leaf and progress towards the base of the leaf.
Purple peptoles an be genetic and most likely are. However there not supposed to be purple on the underside of the peptole, just the top half. If the stalk (meristem) and branches are purple (solid or streaked) and leaves are yellow, then Its a N deficiency( or PH/salt lock out) that's antagonizing magnesium, which Is exactly whats going on here.

You need to check PH-- 6.5 is optimal and asses your EC/PPM. Feed or flush and PH adjust.
where did you take the leaves from? I see 3 and 5 bladed leaves. Either the plant is young and having problems, or the plant is older and the lower growth is being affected.
Important to remember mobile elements that are deficient show symptoms in older growth. Immobile elements show in new growth.

I addition to my advise, I will tell you that if it's not fixed (the deficiency/lockout/PH) it will continue to become deficient In other elements as well.

HaHend said:

Hi,

my plants have plenty of yellow leafes.

What kind of deficiency do they seem to have?

I checked abuse charts and it looks either like a nitrogen or sulfur deficiency to me.

The leaf stems are purple.

Please check attached picture.

I hope you can help me.


View attachment 2938578

Here a high res picture:

Click to expand...

If your leaves start to yellow from bottom to top it's DEFINITELY a Nitrogen defficiency.And since those leaves are small,i can assume that are leaves from the bottom of the plant.Try a feltilizer for all purpose's with an NPK 20-20-20 or 10-10-10 . OR a High N food,like 3-1-2 formula.Keep in mind that it can also be like 9-3-6 or 18-6-12.MJ is a plant that uses foliage to produce.Foliage needs N,N keeps foliage alive and gives you buds.

tikitoker said:

first ........... S deficiency displays itself as yellowing starting from the base of the leaf (where peptole and blades meet) and progress towards the tips of the blades.
N deficiency displays itself as yellowing starting from he tips of the leaf and progress towards the base of the leaf.
Purple peptoles an be genetic and most likely are. However there not supposed to be purple on the underside of the peptole, just the top half. If the stalk (meristem) and branches are purple (solid or streaked) and leaves are yellow, then Its a N deficiency( or PH/salt lock out) that's antagonizing magnesium, which Is exactly whats going on here.

You need to check PH-- 6.5 is optimal and asses your EC/PPM. Feed or flush and PH adjust.
where did you take the leaves from? I see 3 and 5 bladed leaves. Either the plant is young and having problems, or the plant is older and the lower growth is being affected.
Important to remember mobile elements that are deficient show symptoms in older growth. Immobile elements show in new growth.

I addition to my advise, I will tell you that if it's not fixed (the deficiency/lockout/PH) it will continue to become deficient In other elements as well.

Click to expand...

very sound advice, and i agree 100%.

brimck325 said:

very sound advice, and i agree 100%.

Click to expand...

Although if he is in soil,he should be way off 6.5,or overfeeding something else,like a high P food,that locks other elements.So it's more likely an N defficiency.If he is doin' hydro,well that's a different story.Soil is an excellent buffer and MJ is VERY tolerant regarding soil ph-nute absorption.That is a fact,and you should consider it before you buy a meter for everything.

qroox said:

Although if he is in soil,he should be way off 6.5,or overfeeding something else,like a high P food,that locks other elements.So it's more likely an N defficiency.If he is doin' hydro,well that's a different story.Soil is an excellent buffer and MJ is VERY tolerant regarding soil ph-nute absorption.That is a fact,and you should consider it before you buy a meter for everything.

Click to expand...

What do you mean "should be way off 6.5 in soil?" soil, 6.5 6.6 is the sweet spot. any lower=lockout any higher=lockout.... check out this link https://www.icmag.com/ic/showthread.php?t=11688 the ultimate ph site.

Looks like a Nitrogen and Magnesium deficiency too me...

qroox said:

Although if he is in soil,he should be way off 6.5,or overfeeding something else,like a high P food,that locks other elements.So it's more likely an N defficiency.If he is doin' hydro,well that's a different story.Soil is an excellent buffer and MJ is VERY tolerant regarding soil ph-nute absorption.That is a fact,and you should consider it before you buy a meter for everything.

Click to expand...

maybe it's me and my garden but as soon as I steer away from 6.5 weather I'm 7.0 or 6.0 the plants to do for shit. If I'm not at that sweet spot dude things start going wrong maybe my plants are just too vigorous.

Alexander Supertramp said:

Looks like a Nitrogen and Magnesium deficiency too me...

Click to expand...

I agree, Feed it veg nutes and perhaps a tsp of Epsom salts and you should be fine as long as your ph is in the correct range for soil. Good Luck.

tikitoker said:

maybe it's me and my garden but as soon as I steer away from 6.5 weather I'm 7.0 or 6.0 the plants to do for shit. If I'm not at that sweet spot dude things start going wrong maybe my plants are just too vigorous.

Click to expand...

Same here!! For the ultimate fastest, most lush growth, 6.6 is where I run. I used to run at 7.0 and over yrs of growing I noticed faster more vigorous growth at just a bit lower.. Now I try 6 or 7 and my girls dont like me.

Maybe its just me, but my plants talk to me and tell me just what they want.

tikitoker said:

maybe it's me and my garden but as soon as I steer away from 6.5 weather I'm 7.0 or 6.0 the plants to do for shit. If I'm not at that sweet spot dude things start going wrong maybe my plants are just too vigorous.

Click to expand...

I can't tell really.i've got a sativa growing right now..only lost a few small leaves from the bottom.like 3-4 max.All of em were yellowish , just like that.I've never tested my soil man........i've got a pretty expensive meter but there was no need..biobizz all mix and some citrus 10-3-7 with micronutes.All it took..

tikitoker said:

Purple peptoles

Click to expand...

did you mean PETIOLE? sulpher def starts with the new growth. highly doubtful is S. N def starts at the bottom. EZPZ.

Thanks for all the support so far!


Before moving my plants (were just in rockwool cubes previously) to the aero system I watered them by hand from the bottom with EC 1.0 and PH 5.7 once a day.

The plants are 90 days old now since they germinated from seed and went through some trouble, hence the long veg time.

But I plan on switching to flowering soon as most plants are ~50cm and bushy now. However I wanted to get rid of the deficiencies first.

I have a 120l reservoir for my aero system now, filled it up 9 days ago for the first time with EC 1.2 and water four times per day now.

I don't let the PH get higher than 6.0 in my reservoir and not lower than 5.5.

Increased the EC to 1.2 to give the plants more nutes and I have less yellow leafes now compared to 10 days ago but there are still some.

I use advanced nutrients 3 part, in 3-2-1. I also use RO water without calmag yet.

In addition to the yellow leaves I also have now many green leaves with tips curling upwards and turning brown.

These leafes are located on the bottom and middle of the plant but not the top part.

I assume this is a magnesium deficiency?

The yellow leaves however are only visible on the bottom of the plant.

I assume that I have to start using calmag to get rid of the magnesium deficiencies and adding nitrogen to get rid of the yellowing of the leafes?

Other data:

Temperature at canopy level: 25° C
Temperature at base ~ 21° C
Temperature during night: ~21° C
Humditiy: Between 35-50 % (Cold and dry winter air, I try to get the humidity up with several methods but this proves to be a hard task)
Runoff PH: 6.2
Runoff EC: 1.2