Putting all the B.S to rest regarding Nutrient Deficiencies.

You don't test leaves. You test/analyze leaf petioles following a certain prescribed practice to find out tissue nutrient profiles.

Click to expand...

hymem said:

After over 10 years of cultivation and experimentation with various nutrients, strains, environmental conditions and grow setups ive decided our industry is at a point where we can actually get questions answered legitimately. One of the most difficult parts of cultivation to this day concerns finding the correct plant nutrition program. It doesnt help that we are all bombarded with tons of bullshit products backed by zero scientific research. Newbie growers must feel helpless in this sea of information. My company Cannagen Consulting has teamed up with the Werc Shop to start testing cannabis leaves for micro and macronutrient percentages. These initial experiments will help to once and for all establish a nutrient deficiency guideline that we can all use. Haven't you noticed that most of the nutrient deficiency guidelines on the web are just a re-post of shit that was originally on overgrow like 10 years ago? All of our experiments will be backed up by lab analysis. What does an Mg def really look like? Lets fucking find out!!!!!

Experiment #1 - Im currently running my beloved Cryptik O.G in a RDWC setup in R.O water using Heavy 16 as a base nutrient. I added Magical, Hygrozyme and Ph Up. My ppm was initally 900 and swung up to around 1100 during the end of the week. The conditions are 78F with 45% Hum. CO2 is at 1000ppm. Plants are about 20 - 24" which means they are big because its an RDWC system. Usually I only run base nutrient in Veg so I added Magical to try and force a Mg lockout because there is a lot of Calcium in Heavy 16. My issue is that according to literature, Mg is fairly mobile and so deficiencies usually begin on the bottom and move up the plant. In this particular instance, which I have never seen before, the deficiency started on the top and started to spread down to the bottom. Maybe it is actually Zinc or Iron and not Mg? Its irritating when your experience runs contrary to literature so..... Why think too hard? Let the Werc Shop test the fucking leaves and determine there Mg,Zn and Fe percentages. If the deficient leaves test lower in Mg,Zn or Fe than the healthy ones we have a definitive experiment showing a deficiency.

View attachment 2118524

Using this basic experiment as a template, we should be able to create a nice, clean, accurate, updated collection of many cannabis deficiencies that are backed up by lab analysis and put all the guess work to rest.

Click to expand...

Leaf analysis is not enough. You need to combine it with soil analysis and the results interperated by an agronomist with a solid understanding of the subject. As you said, lock-outs can be caused which will throw the results way-off.
By the way, if you are specifically trying to force a Mag lock-out, excess phosphates, not calcium is a better option. Excess Calcium will have too many other effects.
To do this, you really need a professional lab. I use them in the course of my job (Head greenkeeper) and a basic test for P,K,Fe,Ca,Mg and pH only costs me about £10. N is pointless testing for as it's so mobile it can vary day-to-day. I could get them done free from my fertilizer supplier but they tend to interperate the results in a way to try and sell me more products so I prefer to stay with an independant laboratory.
I have a degree in soil science and this is something even I wouldn't attempt. I do my own pH testing (simple) and soil particle size analysis (simple but the equipment to set it up was expensive) but what you are talking about is a whole different thing and shouldn't even be attempted unless you have a career in it.

Click to expand...

I can get you decent pics of MAG burn. my ph was low, like 6ish, locking it out. I fixed the ph and the mag burned it. the normal green leaves have areas of lighter green, almost makes em look camo.

Click to expand...