need help on yellow leaves and brown spots down center

What is your experience level? (first timer

Your Equipment:
.1) Type and wattage of lights. 600w hps
.2) Distance from tops? 8"
.3) Reflector type? enclosed air cooled
.4) Is there a consistent fresh air supply? yes
.5) Do you have an exhaust fan and a circulation fan? exhaust yes circulation no
.6) What are the bulb wattages, kelvin ratings, and schedule? 600w 12/12

Your medium:
.7) Specific brand and type of soil, ocean forest no additives
.8) Size of container. 3 gallon
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? used rapid rooters for seedlings

Your nutrients and water:
10) Source of water?tap in 6.5 range
11) Method of checking water ph. (ph pen, test strips, aquarium test kit...)
12) Method of adjusting water ph.ph up/down
13) Specific brand and N-P-K ratio for each bottle. using fox farm nutes strictly according to their schedule
14) How often are you watering between feedings, and how much per watering? i water every other day until little runoff and every other watering has nutes. I do add 1tbs per gallon of mollasses during nonnute waterings
15) Any additives or tea's? mollases
16) Are your ph levels stable, or do they fluctuate? ph levels stable
17) What is your ingoing water's ph? ...your runoff ph?ingoing is 6.5 runoff is 5.0
18) Do you foliar feed? no

Your growroom:
19) Indoors or outdoors? indoors (garage)
20) What size of closet, room or hut? 3x3 cab
21) What are the temps and humidity levels while lights are on? ...With lights off? on 73 off 65
22) Have you seen signs of insects in the growroom? no

Your strain:
23) What strain are you growing? white widow
24) From seeds or clones? seeds
25) Is this an autoflower strain? no


Ok here are some pics. I am pretty sure i have a nute lockout problem. I am about 19 days from harvest. This is my first time growing. I am wondering if i should do a flush now? I do plan to flush at day 51....next Friday. They have 2 more nute feedings between now and the preharvest flush.

I am curious if this close to harvest if I should just let them go for the next 8 days in this state until I do the preharvest flush?

Looks like nute burn to me. I did it just after a repot and it looked the same(but without buds).

Try lowering the nutes just a bit, or try watering without nutes an extra time. Not a full flush just lower how much is in the soil by a little. MANY times I've read, it's almost always better to under nute, then burn them. So going a little weak won't hurt. Mine responded to lower nutes within a few days. then dropped the burnt leaves after a week.

However loosing leaves at the end of flowering is common. So wait on a more experienced person before blindly following me. :D

On the contrary, It looks like deficiency to me. deficiency caused by the plant redirecting its energy and nutrients to the buds rather than the foliage.

As Vance said, it's quite common for leaves to start dying off as harvest time approaches. IMO, this is exactly what's happening.

Like I've said, I'm a nooob! lol

To the OP, I think your plants look great BTW. Beyond those yellow leaves I see beautiful buds. Great job! :thumbsup:

Too much molasses, and the magnesium in it will build-up to toxic levels locking-out other nutrients. I use 1 tsp per gallon of properly ph'd water on non-nute days from 4 weeks into flower till harvest. (the unsulfured molasses I use is about 5.1 ph)

A starting ph of 6.5 is tricky, as the buffers in the Ocean Forrest fade (late in flower) the ph will drop further. Proper range for peat-based mixes are between 6.3ish and 6.9ish. Wander outside that range, and lockouts occur.

Are you using test strips to check runoff ph? If so...stop wasting your money. Keep 'em for ingoing water ph. The problem with those is that they aren't even in the ballpark. The color coded results are skewed by tinted runoff and colored nutrients.

If using a ph pen for testing ph, you'll want to adjust-up the ingoing water ph a tad. 5.0 runoff is too low.

No fatal damage by the looks of it though. They still look smokable to me. :jointsmile:

^^ I think Rusty has it right as usual :greenthumb:

But for next time - Have you thought about 5 gals instead of just the 3gals? You can get away with the 3 gals with clones, but the root systems of plants from seed are much larger and also like to have more room to stretch out.

I've also noticed that transplanting a week or two into flowering to a new pot helps with the problem of ph drop/buffer depletion.

Quote:

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Originally Posted by bigtopsfinn

I've also noticed that transplanting a week or two into flowering to a new pot helps with the problem of ph drop/buffer depletion.

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Yup. The added rootspace is a bonus, too. :thumbsup: