yellowing during flowering??

[chongsbuddy]

I have 3 different strains at 3.5 weeks into flowering,the bottom big fan leaves are starting to yellow,the leaves around the buds are fine,nice and green,no other problems.Do you know what causes this,or if its a problem?I assume there is not a lot of nitrogen left,so thats why the yellowing is happening,am I right?Please help!!

 

[Grat3fulh3ad]

yeah... sounds like a nitrogen deficiency...
More details?

 

[chongsbuddy]

Im growing soil,the ph is 6-6.5 andI feed 1/3 strength with dnf 2 part bloom every 2 feedings.I use a 400 watt hps with good air flow andexchange,the humidity was high,so I put a dehumidifier in to put it down to 52%.It does get up to over 80 degrees with the light on.

 

[Grat3fulh3ad]

Don't you need to use both parts of the 2 part?... I don't start withholding nitrogen until the latter half of flowering...

 

[chongsbuddy]

yeah,I use both parts for sure!There is a 2 part veg and a 2 part bloom,maybe I started the bloom a little early,it says not to start the bloom until the 3rd week of flowering,I started after 2.

 

[Grat3fulh3ad]

They look hungry all around...

 

[chongsbuddy]

should I increase the amout of nutes?I dont have an ec meter that why I feed so little,im afraid of the ec getting too high.

 

[Grat3fulh3ad]

Yeah... I'd double up on what you're using...

 

[Guest]

piss on it...lol just kidding you definitely need more N

 

[JJScorpio]

You are giving one third of the recommended feeding every other feeding? If it were me I would give them a full dose of vegging ferts the next watering and then go back to the flowering nutes. By the third feeding you should be up to full recomended amount.

How high over the plant is the light?

 

[chongsbuddy]

the plant is about 18" from the light.I just fed at full strength,but I used more of the one bottle with more nitrogen in it.One part is 3-0-3 and the other is 1-0.5-3.It says that at full strength you should use half a teaspoon per liter.In a 4 liter pail I used 3 teaspoons of the 3-0-3 and 1 teaspoon of the 1-0.5-3.I hope that the increase in nutes including a good boost of nitrogen will suffice.What do you gurus think?How long does it take to see a difference?

 

[Blackvelvet]

No phosphorus

No phosphorus

You fed them this in ppm: (assumes 1 gram per ml)

n 150
p 2.68
k 124

Normal range for phosphorus (p) is about 30 to 50. I think you are supposed to be using bloom fortifier along with the 2 part. This is 0-50-30. Even using full strength 1-.5-3 at 1/2 teaspoon per liter, you only get 5.4 ppm p.

I only had the npk numbers. If you have % of the other elements like calcium and magnesium, we can see what your giving the plant.


.

 

[Blackvelvet]

Chongsbuddy, add some phosphorus! LMAO

All you Blackvelvet haters like Grat3fulh3ad and Core ...see why you do the math?

 

[Guest]

First thing I'd do is check my soil PH especially if I didnt use dolomite,most "nute defeciencies" are caused by ph imbalances.Todays soils and nutes are killer but only if the plants can utilize them.

 

[Blackvelvet]

Soilman, he's been using only about 5 ppm p at most. The lucas formula has around 100!

I hope he checks back in on his thread. I am growing concerned. Everyone said lack of nitrogen.


.

 

[Guest]

I'd have to see the rest of the plant to confidently diagnose a lack of P,I do see red stems.Has growth seemed stunted or normal?Does new growth have a bluish tint or blue "blotches" on the leaf?Shoot the top of the plant and I'll tell you if its a P defeciency.I'd still look towards a nitrogen defeciency due to ph imbalance or micro imbalance before blaming soil and ferts

 

[Grat3fulh3ad]

BlackVelvet, buddy... I sais it sounded like N from his description, before the pics were up... then when I saw the pics, It's quite obvious that they are hungry all the way around, which I said... There is more going on than just a P deficiency, they're all aroung hungry...

And... your calculator forgot to figure that he's in soil, not soilless... Did you calculate in the elements present there, OR are you just talking from your ass YET AGAIN?

BV... please try to learn to read plants, not numbers...

 

[Grat3fulh3ad]

the plant is about 18" from the light.I just fed at full strength,but I used more of the one bottle with more nitrogen in it.One part is 3-0-3 and the other is 1-0.5-3.It says that at full strength you should use half a teaspoon per liter.In a 4 liter pail I used 3 teaspoons of the 3-0-3 and 1 teaspoon of the 1-0.5-3.I hope that the increase in nutes including a good boost of nitrogen will suffice.What do you gurus think?How long does it take to see a difference?

This is not a good solution to the issue, though...

You should have just kept the ratios of your two parts equal, and increased the overall concentration...

I wonder how the nute mfg. came up with those ratios, though... they are quite a bit off... Seperating the elements during storage might make more P available than normal, or some such thing, but IMHO there are a lot more balanced nutes out there.

Like I said earlier, though... from looking at the pics... they're all around hungry... No matter what bottles or calcs say, those ladies need some NPK...

 

[cobain420]

I agree, they look they are hungry all around.

Double up on your feeding regimen, and in a week or two you should see a large improvement.

Good luck!

 

[Blackvelvet]

There is more going on than just a P deficiency, they're all aroung hungry...

Your right. If he was using 1/3 strenght dnf (2.5ml per L full strength), they are starving.

Fed for 3 weeks:

n 33
p 1.77
k 42

33 ppm nitrogen would hardly even grow a seedling. Notice he has only 2 p. Odd for a bloom fert. Needs 0-50-30 to be more complete according to the dnf feeding schedule. Also, something like black and gold formula also needs to be added. (don't remember exactly). I hope that was not the source of calcium, magnesium, etc...and just some bs additive like cane sugar.