Mag deficiency or nitrogen?

[Tizer108]

Thanks for everyone’s input, being a novice everything you guys say helps
@Waira i will get some better pictures tonight for you. She is currently in bloom (week 7) and other than a few yellow leaves looks lovely. I’m just concerned that a leaf will be fine one day and compleatly faded the next... after doing a bit more research on people using light mix along with the standard nute schedule it seems that a few people have said the same thing happens at the same time in the grow. Week 6/7 comes around and a mag def occurs....
I have emailed biobizz asking for the recommend dosage for cal mag foliar application so Hopfully they will get back to me ASAP and I can get moving on that.
With regards to enzymes ect, no I’m not using any, just solely using the biobizz schedule which up until now has been perfect.

 

[Tizer108]

has anyone used the biobizz cal mag as a foliar spray and any advice on dosage?

 

[Tizer108]

Or any recommendations on any other brands of cal mag that can be applied as folier and labels folier dosage?

 

[Dr Fluff]

View attachment 1206495

has anyone used the biobizz cal mag as a foliar spray and any advice on dosage?

Biobizz CalMag was only introduced to the range earlier this year, so this will be the reason there is no data.
It is possible someone has tried it as a foliar spray but it is not very likely.
In time we will see more data and hopefully BioBizz will run tests?
However you can use epsom salts, which is a known quantity and will supply plenty of Magnesium to the plant.
It won't supply any calcium, you CalMag will do that.
Epsom salts can be found cheaply in your local Pharmacy, if anyone inquires what you are using it for , say to put in the bath for aching joints and muscles. (They shouldn't ask but you know what chemists are like, always trying to sell you something).
1 level teaspoon to 1 liter of water will do the trick.
How to mix - Measure 1 level teaspoon of Epsom salts and put in a small container or cup. Add to that a small amount of hot water and stir until all the crystals are dissolved, you will know when this has happened as there will no longer be a crunchy feeling at the bottom of your cup (I like to use a chopstick to do this)
Once the epsom salts has dissolved pour in to your sprayer and make it up to 1 liter with cold water.
Turn the sprayer nozzle to fine mist and at lights out spray the tops of the leaves until they are lightly coated.
The optimal time to spray is in the first 15 minutes of lights out, this is the time just before the leaves start to relax and is the optimum time for the plants to absorb the foliar spray.
Epsom salts are cheap, easily obtained and work well in this application.
Badly affected leaves won't recover, best to take them off.
The initial spraying should give the plant the mag it needs and using the CalMag at the roots should stop any further Mag def.
You can of course continue to use the spray once every two weeks for a belt and braces method, epsom salts are hard to over use but less is more. anything used too much can damage the plant.

 

[Tizer108]

Thanks @arty zan!
I’ll look and picking up some Epsom salts.. how often do you recommend misting the leaves? Once per week?

 

[Dr Fluff]

Or any recommendations on any other brands of cal mag that can be applied as folier and labels folier dosage?

Shogun CalMag has foliar spray advice
Foliar Application – CalMag can be used as a foliar feed to correct deficiencies relating to poor establishment or environmental problems. Add at a rate of 15mL/L and spray onto the leaves. Spray once per week until the issue is resolved. The recommended pH for foliar application is – 5-7.

There maybe other CalMag's which offer foliar spray advice but it is a matter of doing some research and just reading the various advice given by the different nutrient companies.
I know this can be a pain in the arse but honestly you will learn a lot from doing the research, it is how I learn what i know.
A day without learning something new, to me is a wasted day!
Virtually all nutrient companies have a CalMag product in their range, some give advice on foliar feeding , some only mention root feeding with it.

 

[Tizer108]

That will be this evenings job, researching the different brands
So would you say it would be better to look at getting a actual “folier cal mag” instead of using the Epsom salt method, or is it serve the same purpose?

 

[Dr Fluff]

Thanks @arty zan!
I’ll look and picking up some Epsom salts.. how often do you recommend misting the leaves? Once per week?

In the above post, my advice is to use the Epsom salts spray to give the plant an instant Mag boost, then apply the CalMag you already have as part of your regular feeding program, at the roots.
Once you are feeding the correct amount at the roots, you shouldn't find you need to spray.
Then if you feel the need you can use once every two weeks, as a belt and braces method ( belt and braces means you are covered if one or the other fails ie. your trousers won't ever fall down).
One last thing I will mention, is to check your PH probe to see that it is properly calibrated.
If you PH probe isn't properly calibrated , your PH will be off and this may cause lock out issues.
This is something that most people let slide.
When I started growing again after a hiatus, I went to use one of my 4 PH meters ranging from cheap PH pens to my more expensive Hanna & Blue Lab meters.
All of them gave a different readings, so I had to calibrate them all.
Youtube is the place to go to see how to calibrate a PH probe.
I use PH powders to do this but PH solutions also work well.
These are the powders I use and buy off of Ebay

They need to be used with deionized water, which can be easily and cheaply found in your local auto store!
here is a video for you

 

[Dr Fluff]

That will be this evenings job, researching the different brands
So would you say it would be better to look at getting a actual “folier cal mag” instead of using the Epsom salt method, or is it serve the same purpose?

When I buy CalMag for the roots i always use one with added iron.
For Spraying Epsom salts will work just fine to address the Magnesium issue.
However many CalMag solutions/Sprays have added benefits such as micro nutrients, amino acids and vitamins, which can also be beneficial to the health of your plants.
If your on a tight budget like many growers are then, buy some epsom salts and get the issue fixed.
If you have some spare Pounds/dollars and you have a grow shop near you, no reason not to go treat yourself to a nice CalMag solution.
It is always good to have a back up, you never know when you might run out, so a airtight tub of Epsom salts can just sit there, just in case the need arises!

 

[Tizer108]

I bought a decent ph meter mainly due to the fact I didn’t want to trust my cheap one as it seemed to swing out of calibration... I will re calibrate my decent one tonight and double check levels ect. like you said, I think the best thing to do is apply the Epsom salts via spraying and I’ll continue the nute schedule aswell as added cal mag but at reduced amounts and see how she gets on with that like I said, she is looking bang on other than a few of the lower leaves showing signs of mag def