Bill, thanks for sharing your wisdom. The last time we wrote, i worked the megacrop and lowered the P and achieved my best grow.. thanks. Indoor i managed 14oz with 2 plants. I shifted to jacks with the 3-2-1 formula. I found the current crop is seeing MG defiencies but i corrected with foliar.
If i choose something else besides mr. Fulvic, what should i be focusing on with similar products?
Megacrop (5-12-26) went to a 2 part almost exactly jacks.
Most cannabis growers use way too much P, which has to be flushed out to prevent flowers from tasting harsh and burning black. At the end of the day, the plant takes the nutrients it needs. You can't force feed a plant.
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I'm sure you didn't expect your question to be a very involved answer concerning fulvic acid. It's a very complicated substance. It's millions of years of organic compounds broken down and concentrated and is very hard to quantify.
Fulvic acid is short-chain organic acids. It is light in color, orange or gold and soluble at all pH levels. It is immediately bioavailable for use in hydroponics, soil and foliar usage. Humic acid is long-chain organic acids. It is darker and only soluble at an alkaline pH. It contains carbon, isn't immediately bioavailable and is only suitable for long-term soil building.
Most fulvic acid listed on fertilizer labels use outdated V&B (Verpleugh and Branifold) testing. This percentage includes the inactive ash content. California and Oregon use even older and inaccurate CDFA testing. CDFA discards the fulvic acid content and only lists the humic content. ISO and LAMAR fulvic acid testing is slightly more up to date and accurate, but the same batch can vary by 10% in test results.
Let's take a couple commercial products as examples. BioAG Ful-Power is 8% V&B, but only 0.15% ISO/LAMAR of actual fulvic acid. Ferti-Organic Fert-Fulvic Plus is 90% V&B, but only 14% ISO/LAMAR fulvic acid. The percentage listed on the label is not what is in the bottle or bag.
Leonardite is a very poor source of fulvic acid. It is a byproduct of the coal and gas industry. It is harvested by strip and blast mining and is very bad for the environment. It is extracted by harsh hydroxide chemical extraction. The extra potassium from the the extraction process can lock out calcium in plants. Shale fulvic acid can be water extracted and is much more environmentally responsible.
Because it is millions of years of organic matter being broken down, some sources of fulvic contain amino and organic acids that are beneficial for plants.
TL;DR: The best sources of fulvic acid are:
1. Tested with ISO/LAMAR, not V&B or CDFA
2. Shale, not Leonardite based
3. Water, not hydroxide or chemically extracted
4. Contain fulvic (not primarily humic), amino and organic acids