. Organic and synthetic fertilizers differ in more ways than just their composition. Synthetic fertilizers dissolve in water and can be used by plants immediately. They help plants to get off to a quick start, but they don't usually do much to improve overall soil health in the long run.
Organic fertilizers, on the other hand, don't break down quickly. Since it can take months to release nutrients, organic fertilizers are often applied in the fall so nutrients will be available by spring. Although it takes them longer to provide nutrients, organic fertilizers tend to improve soil structure and provide benefits that can last for multiple growing seasons.
Many farmers and gardeners choose to use a combination of organic and synthetic fertilizers over the course of a typical growing season. Farmers, in particular, often have a lot of one type of fertilizer on hand: animal manure!
Manure from cows and horses make great fertilizer, as long as it is allowed to age and is mixed with compost. As manure breaks down, it adds nutrients that plants can use. It also conditions and enriches the soil, helping it to retain moisture and reduce runoff.