HELP. Mg problem (i think)

Hey everyone ,

i am using a DWC set up here and have a few young fem. masterkush plants.

3 plants 1 is perfect , 1 is a lil slow, and ... one has a problem.

the below pics are of the damaged plant
all plants are using the same nutrient and ph'd water

the damage started on the first true leaves, and have not completely died yet , they are just damaged and burned. the problem appears to be traveling up the plant.

i believe it has something to do with a magnesium defficiency but i am not sure what to do.

i am confused, i need your advice!

Whats the pH

i started out at about 5.9 and have since raised it to 6.0 as they have grown

i have tried to counteract the Mg def. by adding a Tbsp of Epsom salts to the res. i did this about 24 hours ago and it has appeared to stop the deveolpment of the problem.

At 5.9 and 6.0 you will be short of calcium and manganese. Magnesium should be available to your plants from 5.8 and up (thats of course if it is present in your N.P.K macroelements nutrients).

Calcium is available for uptake at 5.8, and 5.8 is probably the better pH with only manganese being unavailable. But manganese is in microelement suppliments. Are you using any microelements in your nutrients?

interesting,
first of all thanks for the help,

i was told that increasing the ph slightly as they grow would be beneficial, so you are saying to keep the ph steady at 5.8 throughout growth?

i did at first think that it did have something to do with manganese, i started out at 5.8 ph, and then increased it...could this be part of the problem?. the thing that confuses me is that the other 2 are nice n healthy and its all the exact same solutions.

i am using the 2 part DNF veg formula, there is a veg fortifier avaliable for the DNF product , but im not sure exactly what it contains, how could i introduce manganese into the nutes?

The hydro people will probably be better to talk to about this, but as I understand it, with hydro, manganese is usually deficient because in order to set the pH at a level that gives the plants the most benefit from the most mobile elements, around 5.8 seems to be the right level which only leaves out manganese.

The best thing to do though before adding any extra micro elements or epsom salts is to actually flush your roots.

The symtoms that your plant has are only specific to that plant. If it were something in the balance of nutrients you were using it would be across the board. My best guess at the moment is that there is a buildup of nutrient in the root zone which can have the same affect as a deficiency, essentially causing a reduction in nutrient uptake.

That to me is all I can think of that would cause problems that werent across the board.

alright thanks a lot for the input tho man!

i will take your advice and flush that one plant with just ph'd water for 24 hours or so
then my plan is to continue with my regular changes across the board and hope for the best when i switch it back.

other then that i guess ill have to do some more research.

once again,
respect

i will take your advice and flush that one plant with just ph'd water for 24 hours or so

Click to expand...

Yep or even distilled water if you have some would be good. If not the pH water is fine.

it is interesting to see after roughly 12 hours of fresh ph'd water the problem appears to have re-developed or at least starting to show signs of whitening on the leaves between the veins again
i feel that this is the same manganese problem . how should i go about introducing some manganese?
a trip to local grow shop and look for a Mn supplement?

Your plants have ph spotting from the ph fluctating between too high and too low. Generally young vegging plants do not get magnesium or mn deficiencies until flowering if there is going to be a problem at all with these 2 elements, calcium is another. The spotting does not dissapear once the ph is balanced, those leaves will die, however the rest of the plant will green back up along with new growth. It is hard to get instant results form the plants, patience and good luck.

thanks brasmith

is it then not nessicarry to find a Mn supplement ?

i did introduce epsom salts for a day or so and this did infact slow the development of then problem.

of course the epsom salts had great effect on the water and the ph was raised along with the EC dramatically. (6.4 ph)

i switched her over to the 5.8 fresh water to flush. this is definatly a big ph swing. and by reading your post you are suggesting that this is causing the re-occurance of the problem. hopefully you are right and she will attempt to heal herself.

my plan is to just let the lil girl flush for the rest the day and then carry on with my regular res. changes and hope that after a few days of back to normal situations that she will adapt and begin to heal herself.

BunOne said:

thanks brasmith

is it then not nessicarry to find a Mn supplement ?

i did introduce epsom salts for a day or so and this did infact slow the development of then problem.

of course the epsom salts had great effect on the water and the ph was raised along with the EC dramatically. (6.4 ph)

i switched her over to the 5.8 fresh water to flush. this is definatly a big ph swing. and by reading your post you are suggesting that this is causing the re-occurance of the problem. hopefully you are right and she will attempt to heal herself.

my plan is to just let the lil girl flush for the rest the day and then carry on with my regular res. changes and hope that after a few days of back to normal situations that she will adapt and begin to heal herself.

Click to expand...

Yep you don't need to go and get an mn supliment, because once the ph is stable they will start to eat again. Your veg food should contain Mn, Mg, and cal in it. Once you have let them go for today start out with 1/2 the amount of food and be sure your water food mix is ph'd before reintroducing to your plants.

sounds good bro.

will do.

should i leave the ph at a constant 5.8 throughout the whole life cycle including flowering?

respect

Yes the more consistant the ph is, the more accepting the plants are to food.

interesting, thanks for all the input and knowledge.

You are welcome Bun, and i hope that your girls come around.