Ok, here's what I'll try.
Base:
- 4 parts coconut coir
- 1 part perlite
- 1 part vermiculite.
Then, need to fertilize. Can look into these as fertilizers:
- cottonseed meal "Cottonseed meal fertilizer provides a healthy kick of slow-releasing nitrogen, potash, and phosphorus. The heavy protein in the cotton meal slows decomposition. Soil microbes have to process the proteins to release nutrients the plants can use. Because of its slow-releasing nature, you can use higher quantities of cottonseed meal. There’s no fear of fertilizer burn with this, making it a safe and sustainable long-term option. And it takes 1-4 months for it to fully break down, so applications can be spaced out. The average NPK for this meal is 6-2-2, making it a viable nitrogen option. Different manufacturers have slightly different ratios of nutrients. It’s wise to check the label for your specific brand. Since it has high organic content, it helps to keep the soil aerated. This reduces compaction in the soil and can help plants to thrive. Soil tilth greatly improves with added organic matter. Cotton meal holds quite a bit of water when saturated. This makes it a great amendment for water retention in garden beds! For every 100lbs of meal used, 9lbs of agricultural lime is needed to bring the soil back to neutral." (https://www.epicgardening.com/cottonseed-meal/)
- alfalfa meal "Alfalfa Meal 3-1-2 Alfalfa Meal is an all natural fertilizer made from fermented alfalfa plants. It’s great at replenishing worn out soils when used as a soil amendment." "If you want to add nitrogen to your soil, try using alfalfa meal or the alfalfa pellets sold for rabbit feed. Alfalfa is a quick-acting source of nitrogen, with healthy amounts of phosphorus and potash. Organic Gardening magazine called rabbit pellets "an excellent all-purpose fertilizer.""
- kelp meal "Kelp meal will add some potassium, but it is mostly prized for its valuable micronutrients that can increase yields and reduce plant stress.
- Alfalfa, cottonseed, and soy meals: These are a good source of nitrogen (alfalfa 2.5 %, cottonseed 7%, soybean 6.5%, approximately.) They have a slow to medium rate of release. It is important that they be listed as organic, because some may come from crops that have been genetically modified and sprayed with pesticides. Alfalfa and cottonseed meals will also add potassium (alfalfa about 2%, cottonseed about 1.5 %.) Alfalfa will add a few trace minerals. Soybean meal is also a source of phosphorous (about 2%.)
- Humic acid: Consists of organic compounds found in compost. Humic acids increase soil microbial activity, improving its structure and enhancing root development.
- Mycorrhizae: This is actually a group of fungi that grow on the roots of plants and form a symbiotic relationship that aids in the absorption of water and nutrients. It is said to increase a plant’s resistance to disease and drought.
- Epsom salts: A fast acting fertilizer containing about 10% magnesium and 13%sulfur. It can be applied in its granular form or dissolved in water as foliar spray (use 1 tbsp. salt to 1 gal. water.)
- Rock phosphate: A mineral powder that breaks down slowly and contains both phosphorous and calcium. Colloidal phosphate contains less phosphorous and calcium than hard rock phosphate but the nutrients are in a form the plants can use more readily. Still only a small percentage will be immediately available in your growing mixture.
- soybean meal "I use soybean meal in a similar way to how alfalfa meal is used. It's also found in big sacks at a farm store, so maybe not practical for a small space, but it is very inexpensive purchased that way."
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Some references:
https://eorganic.org/node/3442 -- one of the recipes has no compost.
http://www.artfulveganliving.com/veganic-gardening/permaculture/veganic-potting-mix/
"To begin making a soilless potting mix, you will first need to consider how long the plant will be growing in its pot and how soon you will need to begin fertilizing. A basic seed starting mix only needs enough nutrients to get the plant started. These usually contain only a few ingredients – peat moss or coconut coir, or pine bark or any combination of these along with perlite and/or vermiculite and sometimes compost. A small amount of added fertilizer will help keep the seedlings growing for 4-6 weeks when they can be transplanted. When planning to grow plants in pots for longer periods of time you will need to fertilize regularly..."
http://www.soilmender.com/products/yum-yum-mix-plant-food/ Ingredients: "Alfalfa meal, cottonseed meal, kelp meal, greensand, rock dust, rock phosphate, humate and dry molasses"
https://www.facebook.com/groups/438437196236308/permalink/1633263083420374/
https://savvygardening.com/diy-potting-soil/
"A by-product of the coconut industry, coir looks and acts a lot like sphagnum peat moss in both commercial and DIY potting soil blends. It has more nutrients than peat moss and lasts even longer, but it’s more expensive to purchase. Coir fiber’s pH is close to neutral.... vermiculite adds calcium and magnesium... Add fertilizers to peat-based potting soils because these mixes don’t naturally contain enough nutrients to support optimum plant growth. ...I use leaf compost from a local landscape supply yard"
http://www.leereich.com/2014/05/to-fertilize-or-not-to-fertilize-that.html
https://www.groworganic.com/blogs/articles/vegan-organic-gardening
https://generalhydroponics.com/products/florablend/
https://www.gardenbetty.com/how-to-make-your-own-seed-starting-and-potting-mix/
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