Making Seed Meal and Lime Fertilizer
Determine how much fertilizer you need. You will need about 1-quart (.25 liters) of fertilizer for every 20-square feet of soil. Your measurements do not need to be exact, so estimate your needs based on the size of your garden. You can adjust the ratio of the fertilizer recipe to make the quantity of fertilizer that you need.
Measure out 4 cups (.25 liters) of cottonseed meal. Cottonseed meal is commonly used in fertilizer because it contains 7% nitrogen, which is what nourishes the plants. Cottonseed meal also has a high protein content. Seed meal is the byproduct of vegetable oils and is often used as animal feed. For the best results, get a certified organic bag to protect you and your plants. While fertilizer is normally measured in nitrogen, potassium, and phosphorus levels, seed meal is measured in protein since it is usually livestock food. Seed meal is cheapest in large quantities and can be stored in an airtight container for years.
Add 1 cup (237 milliliters) of lime. When buying lime you have three options -- agricultural lime, gypsum, and dolomite (or dolomitic lime). All three of them will boost plant health and productivity the best, but if you're on a budget you can cut the recipe to just one of the three options. If you do only buy one form of lime, use dolomite whenever possible, as it contains essential magnesium.
Add a phosphorous booster. Mix in 1 cup (237 milliliters) bone meal, phosphate rock, or bat guano to increase the phosphorus levels. While the two ingredients above, seed meal and lime, are the most essential, a good fertilizer usually supplies phosphorus. If budget is an issue, you can skip this step, but bone meal is easy to find at garden stores and will make a big difference for your plants. Like the rest of the ingredients, bone meal can be bought cheaply in bulk and stored in an airtight container for several years.
Add kelp or seaweed in the fertilizer. Mix in 1 cup (237 milliliters) kelp meal or dried seaweed to provide essential trace minerals. Again, this step isn't necessary if you're on a budget, by kelp meal helps plants resist stress from heat, cold, drought, and a multitude of other issues. Your best option for cheap kelp meal is usually online. A similar but less expensive alternative is basalt dust.
Distribute your fertilizer onto the soil. Spread roughly 1 quart of fertilizer over the earth before planting anything, mixing gently into the soil. For nutrient heavy vegetables like cabbage, spinach, brussels sprouts, asparagus, or leeks, you can also sprinkle some fertilizer around the roots every 3-4 weeks. If you feel like your soil isn't very rich (for example, there is a lot of clay), you can add another half quart per 20 square feet. If your plants are already in the ground but want some fertilizer, use your hands or a trowel to lightly mix the fertilizer into the top layer of soil. Lightly water the plants both before and after applying.
Using Epsom Salts for Fertilizer
Make an Epsom salt fertilizer. Mix together Epsom Salts, baking powder, salt peter, and ammonia with a gallon (4 liters) of water for an all-around fertilizer. This mixture is good for any plant type and should be sprayed once every 4-6 weeks. To make it, simply combine the ingredients with a gallon (4 liters) of water and shake or mix until completely dissolved: 1 teaspoon (5 milliliters) Epsom Salts 1 teaspoon (5 milliliters) baking powder 1 teaspoon (5 milliliters) saltpeter 1/2 teaspoon (2.5 milliliters) ammonia.
Make an Epsom salt bath. Mix 1 tablespoon (15 milliliters) Epsom salts with 1 gallon (4 liters) water for an even easier liquid fertilizer. Epsom salts contain both magnesium and sulfur acids, which help plants stay healthy and gives added flavor to a variety of vegetables. Once a month, mix up 1 tablespoon (15 milliliters) of Epsom salts with 1 gallon (4 liters) water and use this to water your plants. Roses, in particular, love Epsom salt baths. You can use a tablespoon of salt for each foot the rose bush is tall, mixing in a gallon of water and using twice a year-- once the leaves appear and right after the first series of blooms. Epsom salt baths can help make up for soil that is low in magnesium and sulfur. While an Epsom salt bath will help your plants sprout, you will need to give them nitrogen, phosphorous, and potassium to keep them growing.
Add Epsom salt to the soil. Sprinkle Epsom salt over the soil of new plants, using a rough tablespoon for each plant. You can sprinkle a tablespoon of Epsom salts on top of the soil for your new seedlings, as they help promote strong, early growth. This is best done right when you transfer the plants from pots or planters into the soil. As you water the plants, they will slowly dissolve the Epsom salts into the soil.
Using Household Objects to Fertilize
Use water from a freshwater aquarium. Freshwater aquariums contain nitrogen, which can provide your plants with a healthy boost. Fish naturally release nitrogen into the water, making their "waste" water an important source of nutrients for plants. Instead of dumping it down the toilet, use it to water your plants once a week. Fish waste, as well, contains trace elements important for plant growth.
Create a coffee compost. Mix coffee grounds with leafy yard waste for "quick compost," especially for acid-loving plants. Mix your coffee grounds with an equal amount of dead leaves, pine straw, and other brown yard clippings and sprinkle over the soil once a month. Roses, azaleas, hydrangeas, and many other plants crave a low pH soil and will respond particularly well. This method isn't just for acid-loving plants -- any gardener can use it to add nitrogen, simply cutting back to once every two months in order to protect the soil from a pH swing.
Use eggshells. Spread old eggshells over your garden, or in the bottom of planting holes, for a calcium boost. Plants like tomatoes and peppers particularly love calcium, but your whole garden will enjoy eggshells. Calcium, which is over 90% of an eggshell's makeup, helps a plant develop strong cell walls. To use eggshells, lightly crush up the shells and spread over the garden. You can till them into the soil or leave them right on top -- they decompose very quickly.
Brew grass tea. Make a "nutrient tea" with grass clippings from your yard. Use the bag on your lawnmower to keep the clippings the next time you cut the grass. Use them to fill up a 5-gallon bucket roughly 2/3s of the way to the top, then fill it near the top with water. Stir it quickly, then let it sit for three days, stirring once each morning. When done, strain out the grass clippings and use your "tea" to water your plants, providing essential nitrogen, by mixing it with an equal amount of water and spraying over the plants.
Use urine. While it may seem gross, urine is a free, nitrogen-rich option for fertilizing plants. While most people are understandably squeamish about storing their own urine, it is high in essential nitrogen. To make the process more palatable, fill a bucket with sawdust and pee into this, dumping a large cup of water over it after you're done. You can then use this nutrient-rich mulch when planting your next batch of plants. Because urine can contain pathogens, you may want to sanitize it by keeping it at a temperature above 68 degrees Fahrenheit (20° Celsius) for at least 30 days. If you don't mind going "to the source," you can dilute your urine with 10-20 times the amount of water and use it to water your plants directly. Straight urine is too concentrated for plants to handle. Note that you can water this down significantly -- up to 20 parts water for 1 part urine, so it doesn't smell foul.
Save and spread your fireplace ashes. Wood ash is high in calcium and potassium, making it an excellent supplement to your soil. Simply spread it right over the garden, using your hands to lightly turn it into the top layer of the soil. Vegetables, in particular, tend to love ash, as it promotes healthy root growth. Warning: Do not use fireplace ashes on plants that love acidic soil like blueberries, roses, or azaleas.
Try banana peels. Cut up banana peels and add them to the hole when planting. Banana peels don't do much once the plant is already in the ground, but it can work wonders as you're planting. The peels contain a lot of potassium, which promotes a plant's root development. Cut up half a banana peel and toss it in the bottom of your hole before adding the plant.
Make your own compost. Composting at home is easy, so you can turn all of your old food scraps, leaves, and plant clippings into food for your garden. When organic matter decays, it releases nutrients that can enrich your soil. You can build your own compost in your yard, or you can try one of the commercially-available kitchen compost units.
Get your soil tested. Take a sample of your soil for testing to fine-tune your fertilizer options. The only way you can tailor your fertilizer effectively is if you know what the soil already contains. The steps above list many different household fertilizers, as well as their essential nutrients, allowing you to make a garden-specific program. You can get home testing kits, or you can bring your sample into a local garden store or county extension office for analysis. When pulling up a soil sample, follow the directions on the kit. If nothing is provided: Use clean, plastic shovels and a well-cleaned bucket. Dirty or metal implements can introduce other minerals and nutrients. Dig a hole 4-6" deep, placing the dirt in the bucket. Do not include mulch or trimmings. Repeat with 4-5 holes, mixing together in a bucket. Dry the soil on newspaper for 12-24 hours. Bag the sample in a clean plastic bag or container and take in for analysis.
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