epsom salt? for low magnesium

[Mellow Man]

I believe I have a magnesium deffiency,the leaves on my plany mostly the fan leaves as well as other new growth have turned almost a yellow!....

I grow with sultz potting soil/mixed with half perlite
my PH is around 6.8 I don't believe it's a lack of N simply because I am only one week into flowering and up to this point all the plants were really a nice forest green! which could only mean lots of N now several of the plants have yellow leaves,I should also add I don't believe the fan leaves are turning yellow because of the sugars being sucked out by the plants simply because they ain't that far into flowering only a week and a couple of days................now my ph was below 6.5 for several days which might have locked out magnesium uptake but I'm not sure!.......so I went out and bought some epsom salt to increase the magnesium and was wondering how much epsom salt to mix with five gallons of water?.....................and how should I go about fixing the problem?

Should I flush the plants with ph balanced water then add epsom salt

Or should I mix up ph balanced water with epsom salt?......

I was also wondering just say if my ph was to low for a couple of days which prevented the plants from taking in magnesium,and if I am right about it being low ph locking out the magnesium and I add epsom salt will this possibly lock out the iron?...........I was reading something somewhere if your soil has to much magnesium somehow the iron gets locked out because of the magnesium......................

Anyhow guys anyone with some niffty idea's on how to cure the problem?
which way and what approach should I take on this,this is my 5th grow and it is the best grow yet for me to date! everything is running so perfect even advanced and moved on up in the world with advance nutes,just hate to have things effect this grow.........the last 2 of my grows lost most of their fan leaves and secondary leaves before the plant finished flowering!....

The Pic below is showing a light green colour leave which use to be really dark green,I have other leaves that are even more yellow! am I correct with my guess or is this a entirely different problem then magnesium deffiency...

Thanking you in advance..

[Mellow Man]

:)..........hope this is the correct stuff

[Mellow Man]

another leaf!

[Zandor]

1 - t-spoon per gallon is what I use when I need it.

[Mellow Man]

1 - t-spoon per gallon is what I use when I need it.

So you agree that it looks like magnesium deffeincy?

[cnd411]

Hi Mellow Man,

Pictures suggest you are dealing with Magnesium deficiency. To treat deficiency add 2 teaspoons of Epsom salts (magnesiun sulfate) per gallon of water/nutrient solution. For fast results, foliage spray with 1 gram Epsom salts per liter water . Greening starts at top of plant and moves downward. add same dose until symtoms disappear. Keep root zone and nutrient solution 70-75 F and your air temperature at 75F day and 65F night. Use full strength nutrient solution with pH balance 6.3 .

[Zandor]

What type of water are you using?

RO water requires you to use CalMag Plus to replace nutrients removed by the RO process. You need to look more for the reason and avoid it in the future as much as correct the problem now.

The idea is a balance of everything at the proper time in the cycle of the plants life.

[Legalizdahurb]

Probably being a bit stupid here but whats "RO water"?

[karmaxul]

RO = reverse osmosis.
MgSO4 will chemically combine with nitrogen at a ph under 5.8. I use no more then 10ppm of the stuff. I did a test with epsom salt and added like a half cup to a one gallon pot. It grew well for a month about with no signs of stress. Then it began to yellow slightly but not bad. Once I transplanted her into a two gallon pot she came back to normal. Mg lock up is hard to get and deficencies are rarely seen as it is a microelement. MgSO4 will stay in your soil for a while increasing the ion content. Hard water limits the nutes your baby can uptake which is why some growers use under 100ppm every two to three days.
One love
c

[Seedling]

It's like you are speaking in code or soemthing.

[Legalizdahurb]

RO = reverse osmosis. Ok then what makes water like this? Sorry if i am bwing really stupid here but u never learn if u dont ask.

[karmaxul]

Long explanation from: http://www.howstuffworks.com/question29.htm

To understand "reverse osmosis," it is probably best to start with normal osmosis. According to Merriam-Webster's Collegiate Dictionary, osmosis is the "movement of a solvent through a semipermeable membrane (as of a living cell) into a solution of higher solute concentration that tends to equalize the concentrations of solute on the two sides of the membrane."

A semipermeable membrane is a membrane that will pass some atoms or molecules but not others. Saran wrap is a membrane, but it is impermeable to almost everything we commonly throw at it. The best common example of a semipermeable membrane would be the lining of your intestines, or a cell wall. Gore-tex is another common semipermeable membrane. Gore-tex fabric contains an extremely thin plastic film into which billions of small pores have been cut. The pores are big enough to let water vapor through, but small enough to prevent liquid water from passing (see this page for more information on Gore-tex fabric).

The membrane allows passage of water molecules but not salt molecules. One way to understand osmotic pressure would be to think of the water molecules on both sides of the membrane. They are in constant Brownian motion. On the salty side, some of the pores get plugged with salt atoms, but on the pure-water side that does not happen. Therefore, more water passes from the pure-water side to the salty side, as there are more pores on the pure-water side for the water molecules to pass through. The water on the salty side rises until one of two things occurs:

* The salt concentration becomes the same on both sides of the membrane (which isn't going to happen in this case since there is pure water on one side and salty water on the other).
* The water pressure rises as the height of the column of salty water rises, until it is equal to the osmotic pressure. At that point, osmosis will stop.

Osmosis, by the way, is why drinking salty water (like ocean water) will kill you. When you put salty water in your stomach, osmotic pressure begins drawing water out of your body to try to dilute the salt in your stomach. Eventually, you dehydrate and die.

In reverse osmosis, the idea is to use the membrane to act like an extremely fine filter to create drinkable water from salty (or otherwise contaminated) water. The salty water is put on one side of the membrane and pressure is applied to stop, and then reverse, the osmotic process. It generally takes a lot of pressure and is fairly slow, but it works.

[The Grim Reefer]

Great explanation. :thumbsup:

I used to work with/around RO Units all the time.

[Legalizdahurb]

Ahhhhh right i think i get u.

---Spliff break after reading all that!---

U mean filtered water e.g.the brita thing i use.
or am i still confused lol
I have heard of osmosis from how water curing workes.
If understand now, i will have 2 start using the salts buster is bringing round here tomorow.

[Legalizdahurb]

P.s. Should i stop filtering my water, i was doing it to get rid of anything the plants didn't like such as chlorine.

[karmaxul]

Mellow Man,
How the ladies doing?

One love
c

[bluntman2006]

1 - t-spoon per gallon is what I use when I need it.
yeah!what he said;)