Organic garden fertilizers have replaced chemical fertilizers because of they are cheap and easy to produce and are also environment friendly. These fertilizers induce nutrients in to the soil, which is then absorbed by the soil microbes to keep the soil healthy whereas, synthetic fertilizers add concentrated nutrients only for the plants. Every natural fertilizer contains the major nutrients that plants need. This includes potassium, phosphorus, and nitrogen.

The following are the various types of organic garden fertilizer

Compost - Compost or humus is a mixture of decaying vegetation. The humus conditions the soil and also retains the moisture in it. It breaks up clay and adds microorganisms and nematodes that enrich soil. The humid acid in the compost releases nutrients that will help the soil to regain its lost nutrients.

Mulch - Mulch is a layer of vegetable matter placed on top of the cultivable soil. Mulches help preserve humidity and maintain temperature of the soil. Also, when the vegetables decompose, it adds more nutrients to the soil.

Composted manure - Composted manure is rich in nitrogen, phosphorus, and potassium. The nutrient values differ for various animal and vegetable-based manures. While composting, the nitrogen content is reduced and the rest of the stable compounds are locked. During this process the temperature raises gradually, which helps in killing of weed seeds and pathogens.

Some more Organic fertilizers that you can use:

Bone meal and Cottonseed meal - Bone meal is rich in phosphorous and calcium and is often used to fertilize tomato and bulb plants. Cottonseed meal is abundant in nitrogen and is a broad-spectrum natural fertilizer.

Fish meal - Fish meal is a great source of nitrogen and phosphorous. It is added to the plants like a meal to supply the right nutrients.

Soybean meal - Soybean meal is used as a chief source of nitrogen. It is added to make the soil regain its lost nutrients.

Salts - Salts are used as magnesium, calcium, and sulfur supplement for soil and plants. It is a cheap material used for neutralizing acidic soils and to break heavy clay soils to let air and water penetrate.