PROBLEM TO BE SOLVED: To provide methods for manufacturing and using an iron chelate generating material in which an effect as a chelate promotion material can be exhibited continuously.SOLUTION: An iron chelate generating material is characterized in that a humus liquid produced by pickling an appropriate amount of undegraded organic matter of a tree or grass in a pyroligneous acid or a bamboo vinegar produced in a manufacturing process of charcoal and being an extremely strongly acidic organic acid and curing it for a long term is soaked in iron alone, or charcoal alone, or the mixture of the iron and the charcoal, and thereby a chelate promotion function, a photosynthesis promotion function, a chemical buffer function, a reduction function and a function of soil aggregation by aggregation effect being the function of the humic acid are applied to the iron alone, or the charcoal alone, or the mixture of the iron and the charcoal.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2018,JPO&INPIT【課題】キレート促進材としての効果を持続的に発揮することが可能な鉄キレート発生材の製造方法、利用方法を提供する。【解決手段】木又は草の未分解の有機物を炭の製造過程で産出される極強酸性の有機酸である木酢液又は竹酢液に適量漬け込み，長期間養生することで製造される腐植液を鉄単独，又は炭単独，又は鉄及び炭の混合物に浸み込ませることにより，当該鉄単独，又は炭単独，又は鉄及び炭の混合物に腐植酸の機能である，キレート促進機能，光合成促進機能，化学的緩衝機能，還元機能，凝集効果による団粒化の機能を付加した鉄キレート発生材。【選択図】図３
