Name That Problem!

[BigCloset]

Here I am on my second grow and I have no idea what this problem is. I am a month into veg and I'm going to veg for just a little while longer, but I want to start flower with some healthy plants. Does anybody out there recognize this problem?












The problem started a little less than a week ago and has progressed ever since. It is affecting mostly the bottom and middle fan leaves. They are getting GH Flora at 15-10-5(G-M-B) and I'm using RO water. The pH is at 5.8. I'm pretty sure that I'm not overfeeding them, could it be heat stress? They are under 600w HPS + 600w MH and are at about 75-85f.

I'm sure one of the experienced growers on here can recognize this problem.

 

[WeeD22MaN]

Hey BigCloset!

I also use GH and when around week 4 in flower I get one or two of thoes on the lower sections on the girls. Usally only 1 or 2 per plant tho they stick around for a wile then dry and fall off. I always thought It was me damageing roots waile doing res changes but I could be wrong. It never spread enough to get me worried.

All the best,
WeedMan

 

[mace_ecam]

15-10-5 is really low in Mg
either add epsom salt (1/2tsp per us gallon) or use the Lucas formula, 0-8-16 ml G-M-B per US gallon.

gl,

mace

 

[Core]

srry two hear about your problems bigcloset...
whats you medium?

 

[DogBoy]

could you post a pic of the underside of the leaf worst affected. Would help diagnose the problem.

 

[sproutco]

Looks like you got a case of zinc deficiency.

This is what the Marijuana Grower's Handbook [Indoor/Greenhouse Edition] by Ed Rosenthal says:

Zn deficiency is noted first as yellowing and necrosis of older leaf margins and tips and then as twisted, curled new growth.

http://72.14.209.104/search?q=cache...abis+zinc+twisted+90&hl=en&gl=us&ct=clnk&cd=3

Here is what the overgrow facts say:

A Zinc deficient plant is obvious from the wispy new growth with twisted leaflets at 90°

http://72.14.209.104/search?q=cache...abis+zinc+twisted+90&hl=en&gl=us&ct=clnk&cd=1

Other than twisting, you might notice on some of the less affected leaves that they are not flat when you look across them. They are wavy. The edges of the leaves undulate (go up and down).

Obvious solution is the plants need more zinc.

Other possible reasons:

>too wet
>too cold
>too much phosphorus
>too much alkaline earth metals like calcium or magnesium
>too much copper
>too much iron
>ph too high
>rootbound

You might consider a one time spray of zinc sulfate. You would use 56 ppm zinc. 212 mg pure zinc in a gallon of water. (56x3.8) If you got 36% zinc sulfate, you would use .6 grams in a gallon of water. (2.77 = the inverse of .36; 2.77 x 212 mg = about 600 mg or .6 grams)

If you only have a way to measure ounces like a cheap postal scale, put 1 ounce 36% zinc sulfate in a gallon of hot water. Shake well. Take 2.5 ounces of this zinc water and put in another gallon jug full of water. Use this diluted mix as your spray. (not the concentrate )

You nutes are strong. Normal range is 100-200 ppm nitrogen. Your using 211.

GH's baseline Flora Series, the 3 bottles, green purple and red, (different from Flora Nova series) veg formula
GH 15grow, 10micro, 5bloom
211 n
46 p
263 k
40 mg

http://www.icmag.com/ic/showthread.php?t=21119

You should reduce your strength to 150 ppm nitrogen. This should be plenty. 10.6 grow-7.1 micro-3.5 bloom

150 n
33 p
186 k
28 mg

You may find it beneficial to add 1/8 teaspoon epsom salts to this. This would give you an extra 15 ppm magnesium. 28+15=43 total ppm mag. Its good to have a ratio of 4:2:1 potassium to calcium to magnesium. You can see instead of 4:1 potassium to magnesium, the original formula has 6.6:1. So you add a little magnesium to make it better.

 

[Eirik]

How is your watering frequency? No water on the night or a little low on day (little runoff) causes toxic buildup. Nute strenghts that usually are OK can go bad this way.

E

 

[BigCloset]

Hey guys, the plants were started in rockwool cubes and then put into ebb&flow with hydroton. I flood four times a day during the light cycle for 15 minutes. During the flood the nutrients completely circulate several times.

I was worried about the low Mg level so I added 1/4tsp per gal epsom salt. I first put the salt into a little hot water to dissolve and then put it into my reservoir. I will let it be for a little while and see what happens.

I am thinking about switching to the Lucas formula because everyone seems to have great results with it and it is also more cost effective.

P.S. - Does anybody think it would be a good idea to add an air stone under each plant in the Flood & Drain? I figure if I did this it would allow more oxygen to the roots, thus allowing me to flood for longer. Anybody ever tried this?

 

[sproutco]

You might find that adding more magnesium makes this worse.

Click on this to enlarge. Once larger, put your cursor in the bottom right corner of the picture to make even larger.

 

[sproutco]

You might consider a one time spray of zinc sulfate. You would use 56 ppm zinc.

:friends: You need 56 mg in 1 liter of water to spray. You can buy 50 mg tablets of zinc at a drugstore or health food store. 100 mg tablet just break in half. Disolve in warm water.



I have not tried spraying a form of zinc from the drugstore. I have only sprayed zinc sulfate. There is no reason this should not work. Use at your own risk.

 

[pontiac]

If youre gonna use zinc from the drugstore, then make sure its "chelated zinc"; its easier for plants to absorb.

 

[BigCloset]

I'm kind of worried about using the drugstore Zinc because apparently nobody has tried it. But I am willing to be a trail blazer if it helps my little baby girls!

 

[mace_ecam]

the biggest advantage with 0-8-16 is that you don't have to tinker around with supplements, its all in there...

 

[sproutco]

Test 1 plant and see what reaction you get. Don't expect something magical to happen. Maybe just start growing more normal.

 

[BigCloset]

I will test the Zinc on the plant that is most badly effected and see what happens. I will do this tomorrow when they are on their dark cycle.

 

[Dr Green]

My guess is Nute burn...over fert...flush and use straight water for a few days and that rockwool does not need as much watering..make the girls work a little to find it...smile...hey, I like that idea..rofl..

http://greenmanspage.com/guides/plant_abuse.html

 

[jackagain]

My guess is Nute burn...over fert...flush and use straight water for a few days and that rockwool does not need as much watering..make the girls work a little to find it...smile...hey, I like that idea..rofl..

http://greenmanspage.com/guides/plant_abuse.html

i found you,,i knew i would,,get the fuck down the road,and if ppl read my posts,they will be ok and free from your sick ass,,hahahahahahah,,thought you would sneek in,,come on sue me mother fucker pervert,scam artist,come on stick up for your self,,come on,,i am on a mission with you fagget,,,you know where i live,,come on post something about me,,i dare you fagget,,,i fucked your mother you son of a bitch

 

[SpacedCWBY]

i found you,,i knew i would,,get the fuck down the road,and if ppl read my posts,they will be ok and free from your sick ass,,hahahahahahah,,thought you would sneek in,,come on sue me mother fucker pervert,scam artist,come on stick up for your self,,come on,,i am on a mission with you fagget,,,you know where i live,,come on post something about me,,i dare you fagget,,,i fucked your mother you son of a bitch

Oh, goodness. Someone's panties were in a bunch.

I have the same exact problem. Using GH 3 part Flora series. Have a couple plants that get these leaves. Was this solved with zinc as was suggested?

Thanks.

Spaced...

 

[VanGrow]

the plants are really dark green thats a pre cursor to over fed........i think they are fried from to strong a nute mix.....raise light a little also cant hurt seems close and doesnt need to be
Good luck
VanGrow