JP-7856253-B2 - Fertilizer composition for promoting the growth of seaweed

Inventors

• キム、 ヒョン－スク
• ジョン、 スン－ウ
• クォン、 クワン－ホ

Assignees

• ポスコ カンパニー リミテッド
• リサーチ インスティチュート オブ インダストリアル サイエンス アンド テクノロジー

Dates

Publication Date

20260511

Application Date

20221202

Priority Date

20211221

Claims (6)

1. Contains iron by-products containing Fe and chelating agents, The chelating agent is DTPA (diethylenetriaminepentaacetic acid), A fertilizer composition for promoting the growth of seaweed, wherein the weight ratio of the Fe component to the chelating agent is 2:1 to 1:5 .
2. The fertilizer composition for promoting the growth of seaweed according to claim 1, further comprising a binder, a base, or a mixture thereof.
3. A fertilizer composition for promoting the growth of seaweed according to claim 2 , comprising: 80 to 98% by weight of iron and steel by-products containing Fe and a chelating agent; and 2 to 20% by weight of other components including a binder, base, or mixture thereof.
4. The fertilizer composition for promoting the growth of seaweed according to claim 2 , wherein the binder is at least one selected from the group consisting of lignin, molasses, and waste molasses.
5. The fertilizer composition for promoting the growth of seaweed is in block or pellet form, as described in claim 1.
6. The block or pellet form of the fertilizer composition for promoting the growth of seaweed according to claim 5 has a strength of 10 to 50 kgf.

Description

This invention relates to a fertilizer composition for promoting the growth of seaweed, which can be smoothly supplied to seaweed growing in seawater by chelating iron by-products containing Fe components, such as slag. Excessive coastal development, an increase in herbivores, and climate change are having many impacts on coastal ecosystems, and the phenomenon of coastal barrenness, particularly the disappearance of seaweed, is becoming extremely serious. According to a survey of coastal barrenness in the Korean Peninsula coastal region provided by the Korea Fisheries Resources Service (FIRA), the area affected by coastal barrenness nationwide, based on 2020 figures, was reported to be 19,100 hectares, 44 times the area of Yeouido Island. One of the causes of coastal barrenness is believed to be the blockage of inorganic nutrients necessary for seaweed growth flowing into rivers due to land reclamation and other land development projects. In Japan, since the mid-to-late 2000s, steel manufacturers and research institutions have been producing fertilizers using iron (Fe), and have conducted demonstration tests on the effects of Fe on seaweed growth and the restoration of coastal areas affected by coastal barrenness. As a result, it has become clear that Fe treatment is effective for the growth of kelp gametophytes and lamellar growth (Kato et al., 2015; Miki et al., 2016). Meanwhile, in South Korea, an invention using iron sulfate and leaf mold as a seaweed growth promoter has also been reported (Seaweed Growth Promoter and Mixing Apparatus: Registration No. 10-206330). Thus, the purpose of developing and supplying Fe-based fertilizers is to alleviate the Fe deficiency among the nutrients appearing in coastal areas where coastal barrenness occurs, and to supply Fe, which is essential for photosynthesis and lamellar growth in seaweed. Generally, seawater exhibits a slightly alkaline pH of approximately 8.0 to 8.4. Inorganic nutrients containing iron (Fe) are solubilized to varying degrees depending on the pH conditions, requiring either maintaining an appropriate pH or supplying inorganic nutrients in a form suitable for the pH. In particular, in slightly alkaline seawater, the degree of Fe solubilization differs significantly depending on the salt form. Generally, when Fe fertilizer salts (divalent iron) used for crops are applied to seawater, they are rapidly oxidized by dissolved oxygen in the seawater, converted to the insoluble form of trivalent iron, and become unusable for seaweed (Kato et al., 2015). Therefore, previous papers and patents have introduced methods to facilitate iron movement in solution by adding humic acid to chelate the iron. However, applying iron salts as fertilizer along with humic acid to seawater requires additional steps, such as installing nets or equipment to prevent leakage. Therefore, there is a real need to develop fertilizer production methods for the effective and sustainable supply of soluble Fe in seawater. This shows the results of comparing the amount of Fe eluted in seawater in different forms according to Example 1 of the present invention.This shows the Fe elution concentration in the fertilizer composition based on the weight percentage ratio of DTPA to the total Fe weight, according to Example 2 of the present invention.This is a photograph of solid fertilizer produced according to Example 3 of the present invention.This shows the weight change of kelp grown after being treated with the fertilizer composition of the present invention according to Example 4 of the present invention.This shows the change in length of kelp grown in a sea area test field after being treated with the fertilizer composition of the present invention, according to Example 5 of the present invention. The following describes preferred embodiments of the present invention. However, embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below. This invention relates to a fertilizer composition for promoting the growth of seaweed. Examples of seaweed to which this invention can be applied include Aonori, Wakame, Kombu, Kajime, and Hijiki, but it is not limited to these; for example, it can be applied to Kombu or Kajime. Specifically, according to one aspect of the present invention, a fertilizer composition for promoting the growth of seaweed is provided, comprising a steel by-product containing an Fe component and a chelating agent. In this invention, the steel by-product containing the above-mentioned Fe component can be slag or the like. Any by-product generated in the steelmaking process containing 10 to 30% by weight of Fe, for example, about 20% by weight, can be used without limitation. For example, steelmaking slag, preferably unaged steelmaking slag, can be used. For instance, steelmaking slag can be dried at 100 to 150°C, for example 105°C, for 1 to 48 hours, for example 24 hour