Start of a magnesium def? Please help!

[Mañ'O'Green]

So what’s high on run off ppm
The water at my house is terrible it’s like 47ppm some one told me I should use calmag to bring it up to 160ppm

Wrong! 47 PPM starting water is very very good. All commercially available fertilizer made for cannabis will love that water! I do not know why cannabis growers are so focused on calcium.In the last year of working in the Infirmary I have not see 1 single case of calcium deficiency Quite the opposite.

This chart has noting to do with EC (the measured PPM of a solution ) It is in elemental PPM - or weight of the element

First off ALL elements need to be included at all times for a nutrient solution to be in balance. If you leave out even 1 you can get a lock out. The ratios above show a wide range of possibilities. For example Just looking at the top 3 for expediency NPK 100-30-100 is in balance, 200,50,300 is in balance, 50,50,300 is not because the nitrogen is out of range low.

This is a simplified chart of the relationships of the elements.

Here is one that will blow your mind:

Any how the point I am trying to make is always fertigate (feed) your plants a balanced with balanced nutrients.

 

[TheFerret]

@BII You can fix a true deficiency with a foliar application you cannot fix a lock-out because the plant already has too much.



How do you know they needed extra food?

I guess I didnt "know" but my thinking was my plants were big and have used a some/majority of what was in the soil and I would rather my ladies be over fed instead of underfed (my plants were waaay underfed my 1st grow).

 

[Mañ'O'Green]

I guess I didnt "know" but my thinking was my plants were big and have used a some/majority of what was in the soil and I would rather my ladies be over fed instead of underfed (my plants were waaay underfed my 1st grow).

Well that sounds good at first but you can always add more it is very difficult to take back out. Underfed plants are fairly easy to diagnose and fix. Overfed is really much harder. Less is better.