Week 5 and yellowing/browning!

[krustytheclown]

Strain: Chronic by Serious Seeds
Age of plants: 5 weeks into flowering
Size of plants: 24" in a SCROG
Light: 400W HPS 18" away from the tops in a hood with glass over it
Cabinet: C13
Ventilation: 265 CFM blower with 35 CFM computer fan for air circulation
Grow Medium: 3 gallon Rubbermaid DWC using netpots with Hydroton and 2 airstones in the nutrient solutions
Nutrients: 2 mL/gallon pH Down, 45 mL/gallon Botanicare PureBlend Pro Bloom 2.2-2-5, 10 mL/gallon Botanicare Cal-Mag Plus
Changing nutes or topping off? Change nutes when the level gets below 40%
Number of plants: 2: One male and one female

Problem: At week 5 in flowering, the plants are becoming very pale yellow and are getting brown spots in the leaves. I pruned off a lot of fan leaves that were experiencing the same problem a week ago, but this has spread to most other leaves, now.

What is causing this and what should I do to correct this? This is my only crop for the year and I would hate to have to lose it...

 

[krustytheclown]

BTW, the pH is around 5.5-6

 

[Odie-O]

i'm running into the same trouble's.the big differnece for me is i don't have a glass piece over my 400w light.i'm hoping it's just a heat problem.if that's the case it's easy to fix.been moving it up alil each day to see if it help's.

you can try moving the light up alil to see if that helps.otherwise some nute problem i would guess.will watch this and see what kind of advice is given.may solve my trouble's also

 

[Core]

if i may guess...i think you have a excess of pottassium
and its starting to lock out some others ...slow absorbtion of Mg an Mn and possible Zn and Fe....when these nutes are lacking P is oftern toxic 2...

 

[Blackvelvet]

Nutrients: 2 mL/gallon pH Down, 45 mL/gallon Botanicare PureBlend Pro Bloom 2.2-2-5, 10 mL/gallon Botanicare Cal-Mag Plus

Way too much ferts...Try about 1/2 rate of this.

 

[est1977]

flush flush flush, get some flora kleen follow the instructions on the boottle btw i just noticed you add ph down to your ferts . your ferts will ph itself to 6.0 ,also id cut your nute strenth in half

 

[mig]

um..first off...if this is your harvest for the whole year..how come u got a male in there too...kind of boggles my mind...but either way..i personally think you gotta bump up your nutes...your phosporus is too low...your plant needs surplus of P when flowering to adequately complete the necessary reactions within the plant. I would bump up all levels to tell you the truth...but esp alot of phosphorus. To me 2.2-2-5 is not too powerful a fert. I use high P guano which is 1-10-.2...works good for me


good things...


ps...pH is the most important thing for nutrient absorption. if your pH is too high or too low it will lock out the nutrients in the soil...no matter how much you put it. So keep that in mind. I keep my pH around 5-5.5 and that seems optimal for me.

 

[mig]

woops...hahaha...clicked several times too many...

 

[Big Bud Bear]

whats with the male????? i see pollen, your yeild is going to be small

 

[krustytheclown]

whats with the male????? i see pollen, your yeild is going to be small

Read this:

http://www.icmag.com/ic/showthread.php?t=47838

 

[Brian1975]

Thought the visual aid would help

 

[NorCal]

i could be wrong but looks like you have some powdery mildew (or what appears to be)

 

[jerseydro]

im also use botanicare line of nutes in my dwc grow big tip i got is with botanic less is more you should be at 1500ppms 30ml of pbp at the most rightnow ph 5.8, and you should onlyt be useing 30ml of the pbp at the most you need to flush good i use clearex for bout 45min, scrub and clean rez good ph balance the new water first and then add nutes i use botanicares hydroplex also for extra p k during flower my nute cab is full so my plants get everything they need but thats just cause im ocd when it comes to my bitches but i for best get a qt of hyroplex and some liquid karma get some female plants and you'll be very happy with results, can you explain what you are going to do with a male plant? anyway gooduck with whatever you do

ps i just checked out your system i just built one very similar a few weeks back im about to get it runnin once my clones root for some mothers check out my grow in the greenhouse forums first time hawaiian snow i posted my formula most strains need alittle less then 2/3 of what im useing my plants cant get enough food but its the strain i did some research and i new it was gonna eat up alot more nutes then most plants so go 2/3 of what i posed on the light side and see whatt happens






peace hope my advice was useful

 

[Blackvelvet]

TOO MUCH FERTS!

TOO MUCH FERTS!

You guys crack me up with these ph charts and things. Too much ferts. Here I will explain...

Using the cannastats nutrient calculator is easy. Here is the link. The calc is at the bottom of the page. http://www.angelfire.com/cantina/fourtwenty/articles/profiles.htm

On the calc, leave the default of 1 and 1 at the top unless you have those numbers. (makes it slightly more accurate). Krusty is using 45 ml per gallon so enter that. Put 2.2 in a nitrogen box. Only do this once and it does not matter whether it is nitrate, ammonia, or urea. Next, enter phosphorus 2 and potassium 5. (His fert was 2.2-2-5) Click calculate. You should get this...Click on it to make larger and once larger you may be able to go to the bottom right corner to make even bigger:






You can see...
n 262
p 104
k 493



10 ml cal mag plus adds:
n 52
ca 83
mg 34

Total n would be 262 + 52 = 314

You only need 100 for flower!!!

Solution:

find the % of cal and mag in the pbp and enter those number in the calc. You are aiming for 4 parts potassium to 2 parts calcium to 1 part magnesium (roughly). If you got 200 potasssium you want 100 calcium and 50 magnesium.

Aim for 100 nitrogen, no less than 30 phosphorus, 200 potasssium, 100 calcium, and 50 magnesium. Experiment with how much pbp and cal mag are needed to achieve this. You don't have to be perfect...

I am stoned

 

[krustytheclown]

I AM GROWING A MALE AND A FEMALE TOGETHER TO GET SEEDS!!!!!!!!!!!!

That's why.

If I get some Liquid Karma, do I use it as an additive to the Pure Blend Pro Bloom, or do I use the Liquid Karma as the only fertilizer?

My PPM has always been around 650, when going with the aforementioned dosages.

Should I keep using the Cal-Mag?

 

[jerseydro]

use the liquid karma as an additive with the pbp and cal-mag my formulas in my thread just use 1/3 to 2/3 max of what i posted and youll be fine my hydro store was out of the lk so i used biogenseis synergy instead almost the same
botanicares nutes have a conversion factor of 700 so im assuming you ec reading is .928 seems very low ec x cf=ppms ec=.928 x cf=700= ppms = 650
ppm/cf=ec

goodluck with your grow and check out botanicares web page i noticed that they give completely different instuctions then whats on the bottle way less product needed

good explanation about the male thats what i was thinking but wasnt sure i never tried to produce seeds yet and weren't sure if thats what your goin for

peace keep growin

 

[jerseydro]

how bout trying to flush the plants with some str8 ph balanced water...get all the nutes out and start over with a 2/3 strength...then up the nutes...but the hawaiian snows i got goin at 20ml/gal are a hungry bunch...so id start it at about 12ml/gal and slowly up it if the plants tell you to...it looks like a lockout of nutes...so flush for 3 days or so with ph balanced water...thats it...then pop the nutes in slowly after the 3rd or 4th day of flush.

 

[Blackvelvet]

Try 13 ml pbp bloom + 5 ml cal mag plus per gallon of water. I showed you how to do the math in the previous post. The above gives you about 100 ppm nitrogen for flower. (26 ppm n comes from the cal mag plus) It also will give you 30 ppm phosphorus like I suggested be your minimum should use. If you need a ph down, use phosphoric acid. Pbp is somewhat low in p.

 

[jerseydro]

ok 13ml instead of 12

 

[Caligrown]

Listen to BlackVelvet. He knows his shit. It is obvious. He is breaking down nutrient makeup of the fert for you so you can understand why you do what you do when you do it.

I overferted due to an incorrect conversion on my tds meter. I looked just like that. Keep an eye on your roots too make sure they are healthy. If you fried the roots you may just have to nurse the grow the rest of the way. If not you can reduce your lighting(raise lights if possible) and lower EC and give some Rhizotonic at recommended strength.


Good luck Friend -Cali