Can nitrogen be locked out?

[clay10]

I've got some serious nitrogen deficiency during flowering. During veg, these lady's don't really seem to need any abnormal amount of nitrogen and they seem to be fine until about midway through flower. Then its almost as if they get none at all.

They are very happy for the first month. During the jump in the first three weeks they double in size, very rapid growth. Buds begin forming and then the yellowing starts. It works its way up dropping about 2 fan leaves a week until its a skinny pole of buds come harvest time. Buds do continue to get larger, but i feel they would be bigger if I could iron this out.

I use 60/40 FF Happy Frog and Perlite, 400W HPS, 1 gallon grow bags, and PB Pro Bloom-soil during flower. Temps, pH, airflow, are all right about where id like em.


They ought to have enough nitrogen, i shouldnt need to give them a Veg nute during because supposedly they done use much nitrogen during flower.


So, can nitrogen be locked out by some condition or deficiency/toxicity?

I can provide pics if it would help, but im not sure i need a diagnosis.

 

[SweetIndica2]

I have experienced nitrogen deficiencies due to lockout before, i'm not exactly what was causing it but i think it's due to too much mg. I gave them a larger dose of calmag than normal, and i think thats what caused it. I've also heard too much mg can cause deficiencies and that it's easy to overdo it with mg.

On the other hand, PBP bloom soil doesn't have alot of N in it, even though plants don't need as much N in flower as they do in veg, they still need a certain amount, it is normal though for some leaves to turn yellow later in flower. How much are you feeding them?

 

[Growdoc]

"I use 60/40 FF Happy Frog and Perlite, 400W HPS, 1 gallon grow bags, and PB Pro Bloom-soil during flower."

1 Gallon grow bags might not be big enough for the need of the plants, best tip to give to you is double bag.

GrowDoc

 

[Blackvelvet]

Sure its lack of nitrogen? Pics might be helpful.

Potassium excess can cause a shortage of ammonia/urea nitrogen (positive atoms) but not nitrate nitrogen. (negative atoms)

Velvet's recipe: 16.67 ml pbp bloom for soil + 5.8 ml cal mag plus per gallon of water

Don't add as much cal mag plus if you recently repotted and used dolomite lime. Its all a guess when your lime begins to run out.

Love your avatar.

 

[clay10]

I'll get some pics.

I feed very lightly during the first 3 weeks because i transplant at the 12/12 switch to the 1 gal bags. As i understand the soil (FFHF) is sufficient during this time. Then i start with 2 tsp(10ml) PBPBs once a week.

I also flush with clearex every two weeks. 2 tsp /gal.

I had some FF tigerbloom and it yellowed them up in this fashion, but very quickly not as gradual as these have been. So i quit using it.

 

[Blackvelvet]

You should be feeding with every watering. Sounds like your just not using enough.

 

[clay10]

This plant is one month into flower. Its beginning the stages of the deficiency.
(3 pics)








This plant is at about day 50. at this point its shed 90% of its fan leaves, and the green in the mini leaves on newly formed buds. The plant above will eventually look like this.

 

[JonnybeGood]

looks like a P def too me.. cuz that one fan leaf is turning yellow on the edges.. N def the leaf just kinda fades yellow as whole.
what is your ph?

and your not listenin to velvets advice right?? its all bs.

 

[Cloud_Strife]

i believe JohnnybeGood has asked the million dollar question.
the first and foremost thing i would check is the pH of your medium.
it may need adjusting, although you stated that it's where you'd like it. you must also adjust the pH of both your water and feed solution before giving to the plants.

 

[Guest]

I would do something different.....

I would buy some pure blend veg food....

and dump the fox farm stuff.....

You should be feeding veg chow about 2 weeks into 12-12....


I use mg organic garden soil..perlite ... dolomitic lime(did you lime?)

pbp grow and flower and liquid karma.....


do the same and you will love your plants....

kick the ff to the curb....

with the right nutrients you can grow in saw dust......







************************************************


Sorry Im out of posts for the day......

I can update existing ones though.....


For small plants I use 10 mg grow 5 lk.... per gallon.....

feed with every water.....

for mid sized like when going up to 2 weeks into flower.....

15 and 10


for about 2 weeks at the end of flower......

20 and 10


nothing the last week......

 

[clay10]

i shoot for a pH of 6.5. I clearex about every 3rd week.

Im starting to think its my temps. They are in the mid 80's

i dont use any FF nutes during flower. Tiger Bloom seems to acclerate this process rapidly if i use it. I use PB Pro Gro during veg. Im a PB fan.

I've got some PB pro gro and PB soil bloom. I think im going to experiment. Im going to give one bloom ferts, one veg, and one both. Im tired of this problem. It hits me every time, and im on my 5th generation.

Also, why does everyone hate b velvet so much?

And for plants this size, what doseage of the PB nutes should i be using during fwr. The more P nutes i give them, the quicker they seem to start hurting.

 

[Levitikuz]

Sup man, i had the same problem for awhile, and i just got sick of it happening like you said...you would get nice size yeilds but you know you could do better!
Well i put some plants into 12/12 a month ago, 2 Sadhus and it started to happen again liek always to the Sadhus so i thought i would try somthing different.
I have some GH FloraMicro because im switchin all the Hydro and FloraMicro has the most N in it of the GH 3 part....
So i got a Gallon of tap water which started out at 200ppms or so and uped them to 1200ppms with JUST GH FloraMicro and put my ph to 6.5-7.0 and gave it to only 1 Sadhu to keep on as a control you see what im saying?
And sure enough the Sadhu i gave it to the leaves started to turn back to a good dark green color and the Sadhu i didnt give any more N to just bloom nutes kept yelloing out!
So i think you should up your N and i really think you got a N def!
Good luck man

 

[sativalicious]

i shoot for a pH of 6.5. I clearex about every 3rd week.

Im starting to think its my temps. They are in the mid 80's

Greets!

I see references to pH in this thread, however I do not see an explicit statement that it was measured. Where you want it may not be where the plant wants it. "Where", exactly, do you want it?

I believe it is nearly impossible to do the right thing for your plant without measuring the pH of the feeding solution going in and also (for soil) the pH of the solution running off. If I do not measure, then I feel like I am making huge assumptions with my feeding solution. For example, I just relocated to a different city with a different water system. I did not realize I was pounding my plants with 9.0 pH until I measured the pH. The nutes alone would not (automatically) adjust the pH far enough downward.

What is the issue being addressed when using the clearex?

Oh... I think temperature is not the primary problem, here.

Good luck!

 

[clay10]

i have an ebay cheapo pH meter, i calibrate it with some neutral solution i glot from the local hydro shop. I try for a ph of 6.5, and am usually tolerant of a .1 or so.

My tap is 7.8~8.0, tds of about 220. Usually a tsp (5ml) per gallon of white vinegar does the trick to get it in the right range.

clearex is just to prevent salt build up. I had that problem in the past.

I realized it may have been a while since given them epsom salt. This seemed to slow the process. But I'm still not sure what i SHOULD be feeding as far as nutes.