Chemical fertilizers are expensive they disturb the equilibrium of agroecosystems and cause pollution to the environment. These problems may be avoided by the use of Organic fertilizers. 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, bloodmeal, 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. The utilization of organic fertilizer has several advantages over conventional chemicals. This book considered organic fertilizers in improvement of agriculture productions.Biografía del autor:
Dr Ahmad Mehrabanassistance prof in crop ecology.Department of Agriculture, Zahedan Branch, Islamic Azad University, Zahedan, Iran.
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