Necrotic and yellow spots form on top leaves.

[georive1]

hey guys i have this plant which has yellow/brown spots on the upper leaves. i read on the Grow FAQs sticky that it comes from Mn deficiency and occurs when large amounts of Mg are present in the soil. and what i have to do is Foliar feed with any chemical fertilizer containing Mn. my question is which checmical fertilizer should i use? this has only shown in the bloom stage i have the girls in coco and they eat botanicare cns17. please help

georive1 Reviewed by georive1 on 07-31-2009. Necrotic and yellow spots form on top leaves. hey guys i have this plant which has yellow/brown spots on the upper leaves. i read on the Grow FAQs sticky that it comes from Mn deficiency and occurs when large amounts of Mg are present in the soil. and what i have to do is Foliar feed with any chemical fertilizer containing Mn. my question is which checmical fertilizer should i use? this has only shown in the bloom stage i have the girls in coco and they eat botanicare cns17. please help :( Rating: 5

[Rusty Trichome]

How much experience do you have diagnosing plant problems...? If you have none, might be best to fill-out the troubleshooting form as best you can, (link is in my signature) and provide a picture if possible. We might find something you overlooked.

It would be irresponsible of us to diagnose blindly and risk further plant damage.

[georive1]

no problem and thanks for the help... i also see it starting on a second girl.

first timer

Your Equipment:
.1) 1k, HPS
.2) Distance from tops? about 8-10"
.3) Reflector type? bare bulb
.4) Is there a consistent fresh air supply? yes
.5) Do you have an exhaust fan and a circulation fan? yes
.6) What are the bulb wattages, kelvin ratings, and schedule? 1k 12/12

Your medium:
.7) Specific brand and type of soil, b'cuzz coco
.8) Size of container. 2 gal
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings? no

Your nutrients and water:
10) Source of water? tap) What's it's ph before adjusting? 6.5 - 7.0
11) Method of checking water ph. (ph pen)
12) Method of adjusting water ph. (PH Up/Down)
13) Specific brand and N-P-K ratio for each bottle. Botanicare CNS17 bloom 2-2-5 was feeding 30ml per gal now have lowered to 20ml since seeing the change in leaves.
14) How often are you watering between feedings, and how much per watering? not doing so.
15) Any additives or tea's? no
16) Are your ph levels stable, or do they fluctuate? stable
17) What is your ingoing water's ph? ...your runoff ph? 6.0 dont know what runoff is.
18) Do you foliar feed? If so, with what, how often, and at what time do you spray? i dont in the flower stage i did in the grow.

Your growroom:
19) Indoors or outdoors? indoors
20) What size of closet, room or hut? 13' long 10' high, 9' wide.
21) What are the temps and humidity levels while lights are on? ...With lights off? on between 72 - 76 degrees, hunidity between 35-50%
22) Have you seen signs of insects in the growroom? no

Your strain:
23) What strain are you growing? (Indica dominate )
24) From seeds or clones? seeds
25) Is this an autoflower strain? not sure..

thanks rusty

[Rusty Trichome]

Shoot. I've got no experience with coco.

But if needing to adjust ph down, you don't need the phUp.

I believe coco needs more calcium. Molasses is a great source of good stuff for your ladies including mag, calcium, iron.... I've replaced using CalMag Plus with molasses in my soil grows. Am pleased with the results.

Not watering between feedings? Doesn't the coco dry-out quicker than a peat-based mix?

Hopefully someone with more experience in coco can help. Until then, there's likely some growlogs you could do an advanced search for, and see where it takes ya. :thumbsup:

[georive1]

thanks for the help i just picked up calmag but havent added it yet the guy at the hydro place said it would help i will try on tomos meal. and the coco does dry out sometimes not all the time if i get to them at the sametime everyday. i will begin to water between. but do u mean with nutes also or just phd water?

[Rusty Trichome]

Cool on the CalMag purchase...Should help.

Nutes per schedule, plain, (properly ph'd) water in-between if necessary. :thumbsup:

[georive1]

hey rusty just wanted to say thanks and give you an outcome since you said you did not have that much experience with coco. also for those that read this and have the same problem. calmag plus looks like it did the trick so far... i eased on the amount of nutes what the manufacturer recommends does not work for the strain i have... be careful everyone using these nutes you can burn your ladies very easily...:thumbsup:

[phatsesh101]

easy on the nutes

rusty says it all the time :thumbsup: