Alright, here’s a breakdown of all the amendments I used and what their purpose is/was
Coco - is a powerful carbon source, one of the best. Carbon is underrated and not talked about enough in growing. The majority of growers in smaller pots run into carbon issues in their grows without realizing it. What they think are deficiencies and issues are just a lack of carbon.
It’s excellent microbe food that helps to buffer Ph levels. It provides K as it breaks down. It helps with soil structure and CEC values. This stuff is top notch and should be cut into almost ALL soil mixes by at least 10%.
Perlite - aeration amendment. This is one most folks should know already. I cut almost all my mixes and especially bagged mixes with 20% perlite. Oxygen is super important to root growth and powering high levels of microbial activity. Perlite doesn’t break down by the microbes either which is a huge bonus because in this setup, all organic matter breaks down at very rapid rates. The porous nature of perlite also gives the microbiology a safe place to hang out and colonize. It basically acts as coral reefs for your microbes to thrive. Other more natural aeration amendments typically don’t stand up well enough to the amount of decomposition that takes place. I will be looking into using vermiculite as well in the future, it comes highly recommended by multiple growers so we’ll see.
EWC - EarthWorm Castings. Since I am not using my own castings, my use for EWC is fairly simple. I want the microbial life it provides along with micro predators like amoebas, Protozoa, and beneficial nematodes. They play a pivotal role in maintaining a healthy soil food web. They also contain a ton of organic matter broken down into humus. A huge boon to any organic grow.
Once my own EWC farm is established the castings will also begin providing a lot of the nutrients and oomph my other amendments currently provide. You can feed the majority of amendments directly to them and they will fix them in the castings for you. Every casting also comes with a nice calcium carbonate molecule in it which our plants love.
Oyster shells - Slow release calcium is our first benefit from these. Plants and microbes love/need calcium and these provide it in a healthy way. They also help to buffer spike and layer mixes, preventing the PH from falling too drastically when the meals and such start working. They provide calcium carbonate, silicate, and quite a few other trace elements. These things are amazing and help all aspects of the soil
Dolomite Lime - Calcium and magnesium. If you haven’t noticed yet, calcium is pretty important. Magnesium is also very important as well. Dolomite lime is a perfect ratio of both for our cannabis. In this mix it is one of the major sources of both, while also buffering the PH of the soil. Dolomite Lime will help keep the bacteria in the container happy as well by preventing the PH from dropping into Fungi territory.
Soft Rock Phosphate - This one right here is a gem. It delivers very available P (oh yeah!) at a medium to slow release rate. This allows us to give the plant the P it wants without scaring off the myco. It also has a bunch of trace, micro, and secondary nutrients as well. However the real gem beyond the P is its countering ability. When my high N sources like blood meal mix with the Dolomite lime, some of the N is lost after being converted to ammonia and gassing off. The SRP prevents this N loss from occurring and escaping the soil. It also puts beneficial CEC properties into the soil, making stuff like calcium stick in the soil instead of being flushed away when watering.
Oh yeah SRP is that awesome. That’s why I bit the bullet and ordered it anyway.
Gypsum - underrated all around. OG organic growers talk about the slow release sulfur enhancing the natural smells and flavors of the buds. Gypsum brings in slow release calcium (yep, calcium again) and sulfur. While the calcium rocks it’s more about the slow release sulfur. Sulfur is also important and very easy to overlook.
Greensand - Greensand is probably one of the best amendments you can use for cannabis. If I could choose only one amendment, I’d go with greensand. Heck, my original recipe called for soil, coco, EWC, perlite and greensand. It really shines when recycling and helps to remineralize the soil. It contains Fe, K, Si, O, Mg, Al, Na, and H. It also contains over 30 other trace minerals and micronutrients. It affects soil structure and increases aeration. This stuff is green gold in a bag.
Kelp meal - Most people are aware of Kelp meal already. On top of the organic matter it provides it also brings in 60 minerals/elements, 12 vitamins and 21 amino acids. Kelp meal is good stuff but needs to be cooked in for maximum and safe effectiveness.
Blood meal - Cannabis and the microbes love N. Blood meal is big N. It also contains Fe as well as various micronutrients and trace elements. It’s blood. It’s a veritable powerhouse all on its own. I love this stuff
Bone meal - Bone meal is another favorite of mine. It has slow burning P along with calcium and N and serves as a buffer
Fish bone meal - Just like bone meal it has nice P that is bonded with calcium making it a slower burn so we don’t scare off the myco. Also a buffer and contains a bunch of micro and trace elements.
All Purpose 4-4-4 - Does what it says. It’s all purpose. Its main job is to provide equal amounts of as much as possible to accommodate different needs. It’s also usually a decent diet filler if other nutrient sources run low.