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Used as a soil amendment for improving soil fertility; adds essential nutrients and organic matter back into the soil, improving structure and water retention.

Involves the use of cover crops that are plowed into the soil to improve its organic matter and nutrient content; helps with erosion control, and soil structure.

Generated from decomposed organic waste; provides a nutrient-rich soil conditioner, promoting soil microfauna and flora, which supports plant growth.

Charcoal-like material made from biomass and used in soil amendment; it improves nutrient and water retention in soil, aiding in sequestering carbon and reducing greenhouse emissions.

Product of the decomposition process using various species of worms; creates a heterogeneous mixture of decomposing vegetable or food waste, bedding materials, and vermicast.

A mixture of finely and coarsely ground animal bones; it is an excellent source of phosphorus and protein, with a slow-release form that aids in root and plant growth over time.

Dried and powdered animal blood; used as a high-nitrogen fertilizer as well as a deterrent for certain types of pests in the garden.

A fast-acting organic liquid fertilizer made from the byproducts of fish processing; it's a good source of nitrogen and phosphorus and is easily absorbable by plants.

Natural mineral sourced from rock deposits; used for its high phosphorus content, essential for the development of roots, flowers, and fruits in crops, although it breaks down slowly.

By-product of sugar refining; used as a soil conditioner and as part of liquid fertilizers or compost tea. It can stimulate microbial activity when added to compost or used in soil drenches.

Extracted from marine algae; acts as a biofertilizer that supplies trace minerals and natural growth hormones to plants, enhances resistance to pests, and conditions the soil.

Bird or bat excrement; an excellent source of nitrogen, phosphorus, and potassium, it also helps enrich the soil with beneficial microbes improving fertility and structure.

A by-product of cotton manufacturing; it slowly releases nitrogen, phosphorus, and potassium, and acidifies the soil - beneficial for acid-loving crops.

Earthworm excrement; used in soil improvement for water retention, nutrient availability and to increase microbial activity which benefits plant growth.

Magnesium sulfate; can correct magnesium or sulfur deficiencies in soil, promote chlorophyll production, and improve nutrient uptake.

Collected from burned wood; provides potassium and calcium carbonate that can increase soil pH and help plants grow if the soil is too acidic.

A product of soybean oil production; works as a slow-releasing, all-natural fertilizer providing nitrogen necessary for plant growth.

Decomposed leaves; used as a soil conditioner that improves water holding capacity, and fosters a healthy soil biological community.

Ground alfalfa plants; utilized as a fertilizer it provides slow-release nitrogen as well as trace minerals and stimulates compost microbial activity.

Made from processed poultry feathers; primarily used as a source of slow-release nitrogen that is beneficial for leafy plant growth over a long period.

Residue left after extracting oil from neem seeds; used as a natural fertilizer and for controlling soil pests and diseases due to its antifungal and nematicidal properties.

Sown as a green manure crop; improves soil fertility by fixing nitrogen and adding organic matter when incorporated back into the soil.

Bat excrement; it differs from bird guano by typically having a higher nitrogen content, making it a potent fertilizer that improves soil structure.

A mixture of poultry manure and sawdust/straw; used as a fertilizer providing a balanced array of nutrients and improving soil texture and organic content.

Residual compost waste from mushroom farming; serves as a soil conditioner with rich organic material that can improve soil structure and nutrient content.

A water fern that fixes nitrogen; used as a biofertilizer particularly in rice paddies, contributing to reduced use of synthetic fertilizers.

The protective coverings of rice grains; when added to soil, they improve aeration and drainage, and slowly decompose to add nutrients back to the soil.

Partially decomposed sphagnum moss; used for its ability to retain moisture and aerate the soil. However, its use is controversial due to environmental concerns involving peatland ecosystem sustainability.

Potassium sulfate; provides potassium and sulfur, which are vital for plant health, flower, and fruit formation without affecting soil pH as much as other potassium sources.