Yellowing and Brown Spotting

[gedogen]

First off thank you to everyone who contributes to the massive amount of knowledge here - it truly is an amazing resource, i've learned so much in the last 2 years. I've got a plant thats 20 some odd days from harvest and she's yellowing w/ some brown spots in certain areas. I've narrowed it down from reading on here to a few things. Can anyone help me out here?

I don't think i've spilled anything on the leaves but thats not completely out of the question as i do have to water from above to get to the back.

Self diagnosed as one of the following:

1. root bound (i've got about a 2.5-3 ga container)
2. nute defficiency - has gotten very little nitrogen as i forgot to feed w/ tiger bloom in addition to the big bloom i've been doing every other feeding
3. completely normal yellowing (seems to be the trend from reading everyone elses yellowing problems) as the plant eats itself in the final stages of its life - i just think it might be alittle early for this as i have 20+ days of flower left.

strain: white widow
no bugs anywhere

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E-indoor or outdoor | Indoor Closet
E-soil, soilless, coco, aero, or hydroponic | soilless
E-specific medium
CSL-Soil type/brand | fox farm happy frog

SCL-Anything you have added to the soil | 1 part perlite
SCLR-Soil or slab runoff pH | 5.2
E-Water source | tap water PH'd to 6.5
E-Source water pH | 9.0+ before PHing

E-Age of plant | 65 days overall. day 29 of flower
E-Type of fertilizer | fox farm big bloom
E-Rate of application | 2 TBSP / gallon (half strength every feeding)
E-Lighting source and distance from plant | 400W HPS . 14" from screen . 8" from buds
E-Air temperature (both day and night if you are running a dark period) | 84.5F day | 79F night

E-Air % Relative humidity | 42% always
E-Lighting schedule | 12/12
E-Type of ventilation your room has | 6" High Output Inline CanFan - cfm of 440 (High Tech Garden Supply)

thanks,
Gedogen

gedogen Reviewed by gedogen on 06-22-2009. Yellowing and Brown Spotting First off thank you to everyone who contributes to the massive amount of knowledge here - it truly is an amazing resource, i've learned so much in the last 2 years. I've got a plant thats 20 some odd days from harvest and she's yellowing w/ some brown spots in certain areas. I've narrowed it down from reading on here to a few things. Can anyone help me out here? I don't think i've spilled anything on the leaves but thats not completely out of the question as i do have to water from above Rating: 5

[HARDDON]

Nice job there.

I wouldnt sweat it. Doesnt look too bad to me.

Your fans will be dropping now and I had the same issue with white russian and did fine.

Marijuana Plant Abuse

is a good source for identifying issues, but yours are ok and appear healthy!!!!

One thing i WOULD do is raise the pH on white widow to almost neutral.

Get as close to 7.0 as you can. That strain does not do so well in total acid.

Good Luck.

[Rusty Trichome]

Kinda looks like overwatering, and lack of proper nutes, with an upcoming ph lockout.

I always go half-strength with the Big Bloom, for both veg and flower. And the Tiger bloom is necessary, lol. The Big Bloom is a catalyst (their words) which doesn't have the micronutes in it. Basically, it's a worm casting and guano tea. The same stuff that's in the Happy Frog. (hmmm...)

Would definatelly try and determine why it's got a 5.2 runoff. That's way too low. Perhaps if adjusting a tad too low, and watering too often, the ph down is wreaking havoc.

Remember, nutes will generally lower your ph. I adjust water to about 6.8ish before nutes. After nutes, it's generally about 6.4ish.

Soilless means without soil...but it's still a peat-based medium. (potting soil) Proper ph range in this medium is 6.3 to 6.8.

[gedogen]

Thanks rusty, harddon,

holy hell, i think i'm smelling a faint odor of mold in a couple of the buds.

1. How can i tell how far the mold has progressed if it is mold to see if its salvageable? i pinched a couple and they feel sound. separated a couple places in a couple colas and no brown ick - nice and plant like looking...

2. Planning on trying to find some serenade but if i can't any luck w/ anything else? i've heard of baking soda and chamomile tea too.

3. Could the symptoms i'm having come from budrot?

Preventative Measures:
- Put a box fan on a tilt (it barely fit!) on medium in there pointing up blowing thru the canopy to get a little more airflow inside.

- Pointed my other fan more directly on the tops.

- Might try running another in vent that comes in above the screen - i really should have 1 above and 1 below.

- Did a little training and rearranging to promote better airflow. my screen is disappointingly sparse though so....

- Anything else i can do on the mold front? mold is scary shit i'm reading.

PH issues
My runoff is yellowy and even worse today 4.9 - i'm going to:

1. PH my water to 6.8 instead of 6.5 before adding my nutes. should i flush?? { i'm going to have to do some tricky manuvering to correct this lol. i use a office like water cooler w/ a 5 ga jug as a water dispenser and i just changed it yesterday - tis full and heavy. }

2. Water less - i had been watering twice daily for the last 2 weeks, i have an extremely light mix. i totally forgot to mention i added a few pounds of sand too - i use the "wet it, ball it, break it" method and that tends to send it a little to the lighter side. Come to think of it i was watering once right when the lights came on and once around 4 hours before the lights went off. biggest beginner mistake right - this is my first grow afterall.

3. Add in the tiger bloom (half strength) - whoops!

Again thanks for your replies, i appreciate you guys time. :rasta: :hippy:

[gedogen]

some pics...