what is organic fertilizer?
Organic fertilizers are fertilizers derived from animal or vegetable matter. (e.g. compost, manure). Naturally occurring organic fertilizers include manure, slurry, worm castings, peat, seaweed, humic acid, and guano. Processed organic fertilizers include compost, blood meal, bone meal, humic acid, amino acids, and seaweed extracts. Other examples are natural enzyme-digested proteins, fish meal, and feather meal. Decomposing crop residue (green manure) from prior years is another source of fertility.
Advantages of Organic Fertilizer:
Organic nutrients and sources
Less danger of over-fertilization
Improves soil structure or “workability”
Vastly improves the water-holding capacities of sandy soils, an especially distinct advantage in arid climates.
Organic Fertilizer Disadvantages:
For the most part, organic fertilizer is not immediately available to the plants due to the slow release.Information on the amount of nutrients and the exact elements in an organic fertilizer such as manure is not readily available to the home gardener.