This are some DIY recipes I've found and decide to share here:
BANANA PEELS - Eating a banana helps replenish lost potassium. Simply throw one or two peels in the hole before planting or bury peels under mulch so they can compost naturally. Get bigger and more blooms. I also use banana peels on my vegetables.
COFFEE GROUNDS – Sprinkled on top of the ground before watering or pour a liquid version on top of the soil. If using as a soil drench, soak 6 cups of coffee grounds in a 5 gallon bucket of water. Let it sit for 2-3 days and then saturate the soil around your plants.
EGG SHELLS – Wash them first, then crush. Eggshells are 93% calcium carbonate, the same ingredient as lime. The eggshells are a good substitute for bonemeal.
MOLASSES – mix 1-3 tablespoons of molasses into a gallon of water. Water your plants with this concoction and watch them grow bigger and healthier.
HUMAN URINE – Sounds disgusting, but urine is considered sterile if the body it’s coming from is healthy and free of viruses and infection. High in nitrogen, urea contains more phosphorous and potassium than many of the fertilizers we buy at the store! A good ratio of urine to water would be 1:8. You can collect a cup of urine and pour it into 8 cups of water. Pour 2 cups around the perimeter of each SMALL plant. For MEDIUM plants add 4 cups and LARGE plants deserve a good 6 cups of your personal home brew.
GRASS CLIPPINGS – Rich in nitrogen, grass breaks down over time and enhances the soil. Fill a 5 gallon bucket full of grass clippings.
CORNMEAL – Contains lots of phosphorus and nitrogen and acts as an effective fungicide. Add a cup of cornmeal to 5 gallons of water. Let it soak for several hours, then strain the liquid so you can add it to a spray bottle. Spray the leaves of plants that are susceptible to fungus.
GREEN TEA -A wonderful plant food is regular green tea.Dilute the tea with two gallons of water. You can use this every time you water.
Homemade Liquid Plant Food:
Add 1 tsp. baking powder, 1 tsp. saltpeter, 1 tsp. epsom salts and 1/2 tsp. ammonia to a gallon of warm water in a bucket.Mix ingredients and store the homemade mixture in an old milk jug or other gallon-size container.Apply to houseplants on a monthly basis, as you would a commercially-purchased liquid fertilizer, by dissolving 1/4 tsp. of the homemade mixture in a quart of water in a watering can. Monitor your plants for any signs of distress.
Symptoms of too much fertilizer include dropping leaves. If you suspect a plant has been given too much fertilizer, water it thoroughly, allowing the excess water to drain off. This will flush any damaging substances away.
Homemade N-P-K Balanced Liquid FoodPour water into a gallon container of milk that is empty except for the residue. The tiny amount of milk left in this mix contains traces of nitrogen, phosphorus and potassium, all of which are necessary for healthy plant growth. Pour water in orange juice or apple juice containers that are empty except for the residue. The small amount of either of these acidic juices contains trace amounts of potassium.Water your plants using a mixture of water from the milk and juice containers, instead of using plain tap water. Using water from both of these sources provides an organic blend of nitrogen, phosphorus and potassium required by plants.
The traces of nitrogen, phosphorus and potassium in the water are highly diluted, and pose no danger of over-fertilization.This are the ones I know and use, do you know other recipes? Share it with us!