Authors: Osamu Miki Taichi Nagai Mawardi Marzuki Chikako Okumura Chika Kosugi Toshiaki Kato
Publish Date: 2015/10/16
Volume: 28, Issue: 3, Pages: 1775-1782
Abstract
To aid in the restoration of coastal barren ground areas it is important to clarify the effects of chelated iron on the growth of seaweed In particular for the further development of practical methods to promote seaweed growth Febinding organic ligands such as humic substances HSs composed of humus materials rather than Febinding inorganic ligands such as ethylenediaminetetraacetic acid EDTA should be investigated In this study the effects of an Fe fertilizer made from HSs and steelmaking slag on the growth of the brown alga Sargassum horneri at the germling and immature stages were examined The addition of the Fe fertilizer eluate containing Fe organic ligand complexes clearly promoted the growth of S horneri at the germling and immature stages It was also clear that the effect of Fe concentration in the Fe fertilizer eluate on the growth rate was almost the same as that of Fe–EDTA Moreover the addition of the Fe fertilizer eluate had a great effect on the brown color of S horneri thalli and promoted the increased content of photosynthetic pigments such as chlorophyll a Based on these experimental results the application of the Fe fertilizer containing Fe organic ligand complexes is expected to become an effective method for the restoration of the barren ground phenomenon in Fedeficient coastal areas
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