Use compost. Compost is nothing more than decomposed organic matter. The average compost pile contains a plethora of beneficial nutrients, including potassium, phosphorus, and nitrogen. Regarding nitrogen, the bacteria in compost break matter down into ammonium, which is then naturally converted by other bacteria into nitrates that plants can absorb through their roots. Compost high in nitrogen materials, including moist greens, fruits, and vegetables, tends to provide the highest content of nitrogen to the soil bed it is applied to.
Add in some composted coffee grounds. Coffee grounds can be mixed directly into the soil or added to a pre-established compost pile. The grounds contain about two percent nitrogen by volume, which is considered fairly high as far as nitrogen-containing materials are concerned. Additionally, while some worry about the acidic properties of coffee, it is the coffee beans rather than the grounds that contain high levels of acid. Coffee grounds that remain after brewing are usually between a pH of 6.5 and 6.8, which is near neutral. You can add coffee grounds directly to the soil by mixing damp grounds into the soil or by spreading the grounds over the surface of the soil and covering them with organic mulch.
Try composted manure. Sheep, beef cattle, and swine manure contain the largest concentrations of nitrogen, with poultry and dairy cattle manure following closely behind. Horse manure also contains some nitrogen, but the concentration is significantly less than it is in other forms of manure. Composted manure, or manure that has had the chance to decompose, is better to use because bacteria has already begun to break down the nitrogen into a form that plants can absorb. Note that there are downsides to using animal manure. Manure tends to increase the salt content of soil, and using manure may lead to an increased yield of weeds.
Mix in a good dose of blood meal for a quick-release fertilizer. Blood meal is an organic product made from dried blood, and it contains 13 percent total nitrogen. This is a notably high percentage for fertilizer components. You can use blood meal as a nitrogen fertilizer by sprinkling it over the top surface of the soil and pouring water over it to help the soil soak it in, or you could mix the blood meal directly with water and apply it as a liquid fertilizer. Blood meal is an especially good source of nitrogen for heavy feeders, like lettuce and corn, because of how fast-acting it is. Blood meal can also be used as a component in compost or as an accelerant for other organic materials, since it promotes the decomposition process.
Apply cotton seed meal cautiously. This fertilizer component is made of ground seeds from the cotton plant. Some consider it to be the second best natural source of nitrogen, following blood meal. Unlike blood meal, however, cotton seed meal breaks down slowly, distributing nitrogen to plants over an extended length of time. The major disadvantage of cotton seed meal is that it has a negative impact on soil pH. It greatly acidifies soil, so if you plan to make an organic fertilizer out of cotton seed meal, you should also carefully monitor the pH of your soil.
Use crab meal, feather meal, or leather meal for slow-release fertilizers. These products are made from ground crab, feathers, and cowhide leather, respectively, and each contains a decent amount of nitrogen. These components all break down at a slow pace, however, and will not provide adequate amounts of usable nitrates to plants in need of a quick dose. These components are good to use in fertilizer mixes and composts, though, since they can maintain a steady content of nitrogen throughout the growing season.
Try biosolids and wood. Treated biosolids and wood materials Sawdust, wood chips, and sewage sludge (which are pre-treated before using as fertilizer) all contain nitrogen and can all be used in nitrogen fertilizers, just make sure that the biosolid you will be using are treated and monitored properly, if not,the associated risks of such products may not be worth the potential benefit. Moreover, because these materials all decompose slowly and contribute small amounts of nitrogen, they are not even the most beneficial nitrogen components available.While they might not be the best choice for nitrogen fertilizers, biosolid fertilizers add much needed nutrients. Wood chips also add anchorage for the plants.
Plant nitrogen-fixing cover crops. Certain plants, like legumes and clover, store nitrogen in nodules at their roots. These nodules release nitrogen into the soil gradually while the plant lives, and when the plant dies, the remaining nitrogen enhances the overall quality of the soil. Just toss some legumes on the soil. Mung beans are suggested since they don't grow too big but they grow fast. To replenish Nitrogen on the soil. Try fallowing. When resting your plot on the 7th year, sow some mung beans. Don't harvest the mung beans, instead, let the seeds fall into the ground for more nitrogen-fixers. Do this, especially if you will be planting heavy feeders like corn on the next growing year.
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