A fertilizer formed from organic components, it refers to plant and animal fertilizers. In addition to the three elements of fertilizer (nitrogen, phosphorus, and potassium), it contains organic matter. (1) It supplies fertilizer nutrients and gradually becomes soluble through chemical action, increasing the fertilizer effect, (2) improves the physicochemical properties of the soil, (3) increases the soil's water retention and absorption capacity, and (4) increases the proliferation of soil bacteria. A typical example is stable manure. Currently, the proportion of inorganic fertilizers is overwhelmingly high, and organic fertilizers are steadily decreasing, leading to calls for a return to organic farming. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
有機質成分によって形成されている肥料で動植物質肥料のこと。肥料の3要素 (窒素,リン酸,カリウム) のほかに有機物を含む。 (1) 肥料養分を供給するとともに化学的作用によって漸次可溶性となって肥効を増す,(2) 土壌の理化学的性質を改善する,(3) 土壌の保水力,吸水力を増す,(4) 土壌細菌を増殖する,などの効果がある。厩堆肥がその代表的なもの。現在では無機質肥料の比重が圧倒的に高く,有機質肥料は減少の一途にあって,有機農業への回帰が叫ばれている。
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