Yellowing Fan Leaves

Indoor
Soil
Medium: Farfards Professional Soil 70% soil, 30% perlite
Water source: Tap Water
Source water pH: Straight from the tap - 7.5
Age of plant: Week 4 of Flower
Type of fertilizer: Technaflora Recipe for Success
Rate of application: 1/2 strength every other feeding
Lighting source and distance from plant: 306 actual watts CFL, < 3"
Temps: 75-80 degrees, 60-65 degrees
Air % Relative humidity: Unknown
Lighting schedule: 12/12
Type of ventilation your room has: 120mm comp fan, 4" oscillating fan


I've been looking around the site both in the FAQ's and posts, but I wanted to make sure that I didn't have a problem on my hands. Since this is a first grow, I find myself worrying like a new parent. What I'm looking at is a gradual yellowing of the plants fan leaves. Is this natural for a plant just entering the 4th week of flower? Also of concern is that this plant has never been flushed during her lifetime. Any input would be greatly appreciated.

are you leaves getting crispy or anything other than yellowing? when plants go into flowering they focus more on growing the bud using more K than N. bloom nutes often dont have N or its very minimal, thats why your seeing yellowing. some nute schedules call for N in the mid-flowering just to bring it back up just a tad, which you really dont need but couldnt hurt. my plants get like that but my nutes have me add a lil N in the mid flower. but to sum it up and answer your question, yes when flowering your fan leaves will get like that, you plants main concern now is budding rather than vegging.

What is weird is that the tops of the leaves are yellowing as opposed to the bottom leaves usually seen in N deficiency. Are you sure its not something else like heat stress? Also, your PH seems too high, try 6.0-6.5 for soil.

Quote:

---

Originally Posted by Mr. Happy

What is weird is that the tops of the leaves are yellowing as opposed to the bottom leaves usually seen in N deficiency. Are you sure its not something else like heat stress? Also, your PH seems too high, try 6.0-6.5 for soil.

---

of course its N deficiency, when flowering plants dont need N cause they are vegging anymore!!!!!! look at mine. you can see it a little, i would show the whole plant but i cant find one with out my girl in it. rambler your on the right track, if your half way through, you could add just a tiny bit of N but you really dont need to. your plants concentrating on flowering rather than producing fan leaves.

Cigarettes42, your probably right about it being a N deficiency but to say it couldn't be anything else smacks of ignorance. Sorry. MH

The reason I suggested other possibilities was just because it appeared from the photos some wilting and such. But I would agree that the plants are OK and it is probably a N deficiency.

I'll see if I can get her back on track then

Rambler, I didn't look very closely at the pictures the first time. They actually look really healthy. N deficiency is good in bloom so rock on. Good job. Good luck!! MH

Your PH is too high,need's too be at 6.8.Your pot's look too small,so prolly root bound.look's like your over-watering.
Some yellowing is normal in flower (for some people) but most of the time I dont get the N def. If your PH and PPM are correct,your chances of N def. are far less.
At this point i would not transplant them.but flush them,then set the ph at 6.8,and feed them a proper mix of bloom fert's

It looks like the high ph is causing lockout.

I use General Hydroponics ph Down (phosphoric acid) 1 tsp:5 gallon bucket of water, brings my well water from 8.0 to 6.8 ph. (6.3 to 6.8 is fine) Lowers the ph, and the plants love the phosphorous.

A good flush with properly ph'd water would definatelly help.

With the yellowing fan leaves, troubleshooting can be tricky, as there's a few reasons to be considered. Like the water ph, the soil and runoff ph, quantity of N in the flower ferts or micronutes.

I agree with Divestoned, in that the nutes I use (Fox Farms) has enough N to keep fans green thru to harvest, but I do have to cure longer to remove those imputities.