Homemake organic fertilizer

Nitrogen (N) – nitrogen is largely responsible for the growth of leaves on the plant.
Phosphorus (P) – Phosphorus is largely responsible for root growth and flower and fruit development. Necessary for blooms, fruiting and healthy roots.
Potassium (K) – Potassium is a nutrient that helps the overall functions of the plant perform correctly with strong roots. It helps with the flow of nutrients and water in a plant, causing them to be more drought and pest resistant. This is the main mineral found in banana peels.
Calcium- Helps with the breakdown of other necessary nutrients like nitrogen in the soil. Necessary for proper root and stem growth.
Magnesium- Helps with the production of chlorophyll. Keeping plants green.

Coffee ground - (2 - .2 - .75) rich Nitrogen, some potassium, phosphorus, Calcium, Magnesium copper, zinc,
Banana or Avocado peels is rich of potassium.
Banana Peel Fertilizer ratio is (0 - 3 -42).
Dry that for long term or use raw for 48 hours.
There is no Nitrogen, Magnesium, Calcium, sodium.
Eggshell- rich Calcium 95% Calciumcarbonate (CaCO3) and some Magnesium Carbonate.
so, brake down with white vinegar to get Calcium.

Knowing the NPK values of a fertilizer can help you select one that is appropriate for the type of plant you are growing. For example, if you are growing leafy vegetables, you may want to apply a fertilizer that has a higher nitrogen number to encourage leafy growth. If you are growing flowers, you may want to apply a fertilizer that has a higher phosphorus number to encourage more blooms
Read more at Gardening Know How: Fertilizer Numbers – What Is N-P-K https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/fertilizer-numbers-npk.htm

Mineral deficiency	Symptom(s)
Nitrate	Poor growth, yellow leaves
Phosphate	Poor root growth, discoloured leaves
Potassium	Poor growth of fruit and flowers, discoloured leaves
Magnesium	Yellow leaves

Grass for nitrogen

Eggshell for Calcium

Banana peel, Eggshell Fertilizer

7 things to do for your garden

11 gardening