What are organic fertilizers primarily made from?

Organic fertilizers are primarily made from natural substances, which include materials such as manure, compost, and seaweed. The characteristic of organic fertilizers is that they are derived from living organisms or the products of living organisms, enhancing soil health by providing essential nutrients in a slow-release form. This type of fertilizer also contributes to improved soil structure and microbial activity, which is beneficial for plant growth.

Natural materials like manure provide not only nutrients but also organic matter, which helps retain soil moisture and enhances soil biodiversity. Compost, made from decomposed organic matter, enriches the soil and promotes a healthy ecosystem for plant roots. Seaweed, rich in trace minerals and growth hormones, is another component that can stimulate plant growth when used as an organic fertilizer.

In contrast, chemical compounds produced in laboratories and mineral ores relate more to synthetic fertilizers, which offer nutrients in a rapidly available form but can lead to issues such as soil degradation and pollution if overused. While compost and peat moss are components of organic fertilizers, they do not encompass the full range of natural materials. Therefore, the encompassing definition of organic fertilizers, which includes a wider variety of natural substances, makes the correct choice clearly C.