Iron preparation for animal and plant growth, its manufacturing method, and iron supply agent for animal and plant growth

Abstract

With the passage of time or temperature changes, precipitates of organic acid iron salts form, and the Fe in the solution 2+ Prevents a significant decrease in ion concentration and maintains a high Fe concentration for a long period of time. 2+ It makes it possible to maintain ion concentration. It can be efficiently taken up by plants and animals, making it possible to prevent soil and water pollution. [Solution] An aqueous solution of sodium iron citrate, prepared by stirring and mixing citric acid, water, and iron, and then compounding it with sodium bicarbonate, contains 0.05 g of citric acid (assuming 100% purity) per 100 ml of water to the citric acid solubility limit at the water temperature, 10 to 25 parts by mass of iron (assuming 100% purity) per 100 ml of water when the citric acid content is 100 parts by mass, and 80 to 120 parts by mass of sodium bicarbonate (assuming 100% purity) per 100 ml of water when the citric acid content is 100 parts by mass.

Description

[Technical Field]

[0001] This invention provides high Fe in aqueous solution state. 2+ In terms of ion concentration, Fe 2+ This invention relates to an iron supplement for plant and animal growth in which ion oxidation is suppressed, a method for producing the same, and an iron supply agent for plant and animal growth.

[0002] In this invention, "for the growth of plants and animals" includes the growth of plants (including seaweed such as wakame and kelp, and marine plants such as mangroves), livestock (cattle, horses, pigs, birds, etc.), and aquatic life (fish, shellfish), excluding humans. Hereafter, it will simply be referred to as "for growth." [Background technology]

[0003] Iron is a trace element essential for the growth of plants, livestock, fish, and other animals and plants. For example, iron deficiency in plants is known to cause specific symptoms such as yellowing and whitening of leaves and impaired protein synthesis.

[0004] Furthermore, for example, iron is absorbed by plants in an ionized state, but among the Fe ions, Fe 3+ It is known that ions (ferric trivalent ions) are not effectively absorbed by plants, making it difficult to obtain satisfactory growth effects.

[0005] Therefore, as shown in Patent Documents 1 and 2, for example, iron is Fe 2+ Although efforts have been made to supply it as an ion (ferrous iron ion), Fe 2+ The ions are oxidized to Fe 3+ Because it easily becomes an ion, Fe 2+ There is a need for the development of iron-supplying agents that can provide a stable supply of ions over the long term.

[0006] The iron supply agent for plants shown in Patent Document 1 is an aqueous solution obtained by heating a mixture containing citric acid powder, FeO powder, and water, in which FeO is dissolved in citric acid. The FeO powder contains 50% by mass or more of FeO with respect to the entire FeO powder, and contains at least one double oxide of CaAl2O4, FeAl2O4, CaFe2Si2O6, CaSi2O5, and MgFe2O4, and contains Fe 2+ ions and Fe 3+ ions. When the total amount of Fe ions is 100% by mass, the Fe 2+ ions are 50 to 90% by mass.

[0007] Then, by dissolving the solid or paste-like substance obtained by drying the aqueous solution in water, an iron supply agent for plants with a specifically high Fe 2+ ion concentration has been proposed.

[0008] However, in the case of the iron supply agent for plants of Patent Document 1, when manufacturing in a general terrestrial environment, Fe 2+ ions are easily oxidized by oxygen in the air to become Fe 3+ ions. As a result, there is a problem that the Fe 2+ ions in the product decrease.

[0009] This problem can be avoided by reducing the oxygen in the manufacturing environment using a decompression device or a degassing device, but there is a problem that the manufacturing cost increases due to an increase in the number of manufacturing devices.

[0010] Also, in a solution with a specifically high Fe 2+ ion concentration obtained by dissolving FeO powder with an organic acid, precipitates of iron organic acid salts are likely to occur over time or due to temperature changes, and there is a problem that the Fe 2+ ion concentration decreases.

[0011] In particular, when citric acid is used as the organic acid, precipitates of iron citrate will occur. The iron citrate is originally dissolved in the solution to provide Fe 2+Although it holds ions, in an aqueous solution in which an iron citrate salt has precipitated, the Fe 2+ ion concentration in the aqueous solution significantly decreases, and an aqueous solution with a particularly high Fe 2+ ion concentration could not be obtained.

[0012] The iron-containing composition for fertilizers shown in Patent Document 2 is characterized in that the total iron content in the composition is 3 to 50 wt%, and 25 wt% or more of this iron content is composed of iron compounds containing crystal water. The iron compound containing crystal water consists of any one or more selected from ferrous hydroxide (Fe(OH)2), ferric hydroxide (Fe(OH)3), and double salts of iron.

[0013] However, most of the iron eluted from the iron-containing composition for fertilizers is Fe 3+ ions, which are difficult for plants to take up and are not effective as fertilizers. Also, the above water-soluble inorganic iron salts have difficulty in maintaining the Fe 2+ ionic state and are easily oxidized to Fe 3+ ions, causing problems such as soil and water pollution due to the accumulation of salts.

[0014] That is, water-soluble inorganic metal salts have been used for a long time as various fertilizers, and the strong acid anions constituting these water-soluble metal salts bind to other elements in the soil to form water-insoluble salts and accumulate in the soil, which has become a problem. In particular, the EDTA iron complex (ethylenediaminetetraacetic acid) used in fertilizers for plants of inorganic metal salts is substantially a chelating agent for trivalent iron and may cause soil pollution by fixing heavy metals in the soil or cause water pollution by dissolving in groundwater.

Prior Art Documents

Patent Documents

[0015]

Patent Document 1

Patent Document 2

Summary of the Invention

[0016] In the plant iron supply agent of Patent Document 1, Fe is produced by oxygen in the air. 2+ The ions oxidize, resulting in Fe 2+ The point is that the ions decrease. Also, Fe 2+ In solutions with unusually high ion concentrations, precipitates of iron organic acid salts are formed over time and with changes in temperature. Fe in aqueous solution 2+ The key point is that the ion concentration decreases significantly.

[0017] In the iron-containing fertilizer composition shown in Patent Document 2, the majority of the leached iron is Fe 3+ The problem is that it is difficult for plants to absorb it as an ion, and therefore it is not effective as a fertilizer. Also, water-soluble inorganic iron salts are Fe 2+ It is difficult to maintain the ionic state, Fe 3+ These substances are easily oxidized into ions, and their accumulation of salts can fix heavy metals in the soil, causing soil contamination, or they can dissolve into groundwater, causing water contamination. [Means for solving the problem]

[0018] The iron growth agent according to claim 1 consists of an aqueous solution of sodium iron citrate, which is obtained by stirring and mixing citric acid, water, and iron to form iron citrate, and then combining it with sodium bicarbonate. The most important feature of this sodium iron citrate is that the amount of citric acid (assuming 100% purity) per 100 ml of water is 10 g to the maximum amount of citric acid that can be dissolved at the water temperature, the amount of iron (assuming 100% purity) per 100 ml of water is 5 to 60 parts by mass when the citric acid content is 100 parts by mass, and the amount of sodium bicarbonate (assuming 100% purity) per 100 ml of water is 80 to 120 parts by mass when the citric acid content is 100 parts by mass.

[0019] The most important feature of the method for producing the growth-promoting iron agent according to claim 6 is that it comprises the steps of: producing an aqueous solution of iron citrate by dissolving iron in an aqueous solution of citric acid and water; and producing sodium iron citrate by combining sodium bicarbonate with the aqueous solution of iron citrate.

[0020] The growth-promoting iron supply agent according to claim 11 is most characterized by containing 5% by mass or more of the growth-promoting iron agent according to any of claims 1 to 5, on a completely dry weight basis. [Effects of the Invention]

[0021] The present invention, according to claims 1, 6, and 11, involves the formation of an organic iron salt precipitate due to the passage of time or temperature changes, and the presence of Fe in an aqueous solution. 2+ It prevents a significant decrease in ion concentration and maintains high Fe levels over the long term. 2+ It can maintain ion concentration.

[0022] Furthermore, the present invention according to claims 1, 6, and 11 enables efficient uptake by plants and animals while preventing soil and water pollution. [Brief explanation of the drawing]

[0023] [Figure 1] This is an explanatory diagram showing the iron ion concentration during the iron citrate production process. [Figure 2] This is an explanatory diagram showing the iron ion concentration during the manufacturing process of sodium iron citrate 1. [Figure 3] This is an explanatory diagram showing the iron ion concentration during the manufacturing process of sodium iron citrate 2. [Figure 4] This is an explanatory diagram showing the iron ion concentration during the manufacturing process of sodium iron citrate 3. [Figure 5] This is an explanatory diagram showing the growth comparison status in Example 1. [Figure 6] This is an explanatory diagram showing the growth comparison status in Example 2 of use. [Figure 7] This is an explanatory diagram showing the growth comparison status in Usage Example 3. [Figure 8] This is an explanatory diagram showing the growth comparison status in Usage Example 4. [Figure 9] This is an explanatory diagram showing the growth comparison status in Usage Example 5. [Figure 10] This is an explanatory diagram showing the growth comparison status in Usage Example 6. [Best Mode for Carrying Out the Invention]

[0024] The optimal form of the sodium iron citrate aqueous solution is obtained by mixing citric acid, water, and iron, and then combining the resulting iron citrate with sodium bicarbonate. The sodium iron citrate solution is prepared by adding 10g of citric acid (assuming 100% purity) per 100ml of water up to the maximum amount of citric acid that can be dissolved at the water temperature, 5 to 60 parts by mass of iron (assuming 100% purity) per 100ml of water (assuming 100% purity) when the citric acid content is 100 parts by mass, and 80 to 120 parts by mass of sodium bicarbonate (assuming 100% purity) per 100ml of water (assuming 100% purity) when the citric acid content is 100 parts by mass. [Example 1]

[0025] The present invention will be described in detail below with reference to examples. [Iron supplement for growth] The iron growth agent of the present invention consists of an aqueous solution of sodium iron citrate salt obtained by combining sodium bicarbonate (NaHCO3) with an aqueous solution of iron citrate prepared by mixing citric acid, water, and iron.

[0026] [Citric acid] The acid used to prepare the aqueous solution is limited to citric acid, which has no environmental impact and is safe to use. This citric acid is a solid or powder with a purity of 99% or higher as the main component. While there are no particular restrictions on particle shape as long as the purity is sufficient, it is preferable that the particles are fine in size so that they dissolve easily in water.

[0027] The citric acid solution prepared by dissolving citric acid in water, as described later, has a pH of 1.0 to 2.0, is odorless, and when iron is added to produce an iron citrate solution, the Fe ratio relative to the acid concentration is... 2+The ion concentration can be made particularly high.

[0028] [water] The water used to dissolve the citric acid is not particularly limited and may be highly purified water such as pure water and deionized water, or it may be commonly used water such as tap water, industrial water, agricultural water, and groundwater.

[0029] [iron] The iron added to the citric acid solution is not limited to FeO, but may also be a solid such as Fe2O3 or Fe3O4, which has iron as the main component; therefore, in this invention, it is referred to as solid iron. The amount of iron contained in the solid iron is not particularly limited, but it is suitable to contain 50% by mass or more (preferably 65% ​​by mass or more, and even more preferably 95% by mass) of iron.

[0030] This solid iron can be, for example, steel wool, iron-containing dust, flaky iron scale generated during wire drawing, iron-containing parts of foundry sand, and various commercially available iron powders. Among these, fine-grained iron powder that dissolves easily in citric acid is preferred. The amount of solid iron to add to the citric acid aqueous solution is adjusted to an iron citrate aqueous solution by adding solid iron at a ratio of 1 to 25 parts per 100 parts of citric acid aqueous solution.

[0031] [Sodium bicarbonate] Sodium bicarbonate (baking soda) refers to a solid or powder whose main component is sodium bicarbonate (usually with a purity of 99% or higher), and the particle shape is not particularly limited as long as it is of that purity. Since it dissolves easily in water, a fine particle size is preferable.

[0032] Sodium bicarbonate, when added to an aqueous solution of iron citrate, produces highly stable sodium iron citrate, and the increase in pH brings the oxidation-reduction potential to the reducing position, thus reducing Fe 2+ The ions oxidize and Fe 3+ This makes it possible to suppress the transition to ions.

[0033] [Sodium ferric citrate] An aqueous solution of iron citrate is produced by stirring and mixing the citric acid, solid iron, and water as described above; adding solid iron to citric acid pre-dissolved in water and stirring and mixing; or adding solid iron and citric acid powder to citric acid pre-dissolved in the required amount and stirring and mixing while heating as necessary. Then, an aqueous solution of sodium iron citrate is produced by mixing sodium bicarbonate into the aqueous solution of iron citrate and heating as necessary. In this sodium iron citrate solution, the addition of sodium bicarbonate alkalizes it to a pH of 5 to 8.

[0034] In the above, the amounts of citric acid, solid iron, and sodium bicarbonate are not particularly limited, but for example, per 100 ml of water, 10 g of citric acid (preferably 15 g - arbitrarily determined within the range of the maximum amount of citric acid that can be dissolved at aqueous solution temperature) is used, 5 to 60 parts by weight of solid iron per 100 ml of water if the citric acid content is 100 parts by weight, and 80 to 120 parts by weight of sodium bicarbonate per 100 ml of water if the citric acid content is 100 parts by weight.

[0035] If insoluble citric acid, solid iron, or sodium bicarbonate remain in the aqueous solution of sodium iron citrate obtained by stirring and mixing as described above, the water-insoluble components can be separated and removed by filtration or centrifuge. While there are no particular limitations on the filtration conditions when using filtration, for example, a membrane filter or filter with a pore size of 10 μm or less, more preferably 5 μm or less, and even more preferably 3 μm or less may be used.

[0036] Furthermore, a water-soluble fungicide, such as wood vinegar (in the case of wood vinegar, 1 to 10% by mass or less relative to the iron growth agent), can be added to the aqueous solution of the above-mentioned iron growth agent to prevent mold growth.

[0037] Furthermore, while there are no particular restrictions on the storage temperature of the aqueous solution of the iron growth agent, it is preferable to store it at a low temperature, for example, 15°C or below. Moreover, it is preferable to store the aqueous solution of the iron growth agent under anaerobic conditions.

[0038] Fe in an aqueous solution of iron citrate 2+ Figure 1 shows the changes in ion concentration, and also the Fe of various iron growth agent aqueous solutions 1 to 3 generated as described above. 2+ The changes in ion concentration are shown in Figures 2 to 4. In Figure 1, in the case of an aqueous solution of iron citrate without sodium bicarbonate, even if iron is mixed with the citric acid solution and stirred, Fe 2+ Since no increase in ion concentration was observed, it was determined that it is unsuitable as an iron supplement for plant growth.

[0039] In the sodium iron citrate aqueous solutions 1 to 3 shown in Figures 2 to 4, Fe is different from the sodium iron citrate aqueous solution in Figure 1. 2+ We were able to confirm an increase in ion concentration, and determined that it is suitable as an iron supplement for growth.

[0040] Furthermore, the "iron" used in the iron citrate shown in Figure 1 and the sodium iron citrate shown in Figure 4, referred to as "wire-drawn iron," is the cut iron (scale) that is removed by the die when iron material is passed through the die to manufacture iron wire.

[0041] [Iron supplement for growth] The growth-promoting iron supply agent may be in the form of an aqueous solution obtained by diluting the above-mentioned sodium ferric citrate to the required concentration, in the form of a solid on which the above-mentioned sodium ferric citrate is supported on a porous carrier such as activated carbon or zeolite, or a macroporous carrier such as pumice, or in the form of a mixture of the above-mentioned sodium ferric citrate with a biodegradable bulking agent. In any case, when the growth-promoting iron supply agent is considered as 100% by mass, it is necessary to contain the growth-promoting iron agent (calculated on a completely dry mass basis) at an amount of 5 to 95% by mass, preferably 50% by mass or less, and most preferably 30% by mass.

[0042] In addition to the iron-producing agent mentioned above, the growth-promoting iron supply agent may contain other components or fillers, either individually or in combination, such as lipoic acid, various vitamins, various components such as Mn, Zn, Cu, Cr, Si, Mg, Ca, Co, Mo, Ni, B, water-soluble compounds such as S and Cl, and water-soluble metal salts. Preferably, the other components included should be 30 parts by mass or less when the growth-promoting iron agent is 100 parts by mass. Suitable fillers include, for example, zeolite, compost, clay, peat, rice husks, diatomaceous earth, and biodegradable resins.

[0043] [Examples of using iron supplements for plant growth] The method of using the growth-promoting iron supply agent is not particularly limited, but for example, it can be used by irrigating the soil or the base of the target plant, spraying it on the leaves, or, when used as a nutrient solution for hydroponics, by immersing the roots of the target plant or mixing it with the soil.

[0044] In particular, the growth-promoting iron supply agent can be suitably used in alkaline soils. Here, alkaline soil is defined as soil in which the pH of the suspension obtained by adding 25 ml of distilled water to 10 g of air-dried soil and shaking for 1 hour is greater than 7, and this includes naturally alkaline soils as well as alkaline soils that have been acquired through fertilization, desertification, etc.

[0045] Examples of inherently alkaline soils include soils containing various calcareous components, either individually or in combination, such as shell fossil soils, calcareous soils, and coral soils. Furthermore, mixed soils containing these various calcareous components and non-alkaline soils, which are alkaline overall, are also included.

[0046] [Manufacturing method for iron supplements for plant growth] (Iron citrate production process) As described above, the process includes, for example, a step of stirring and mixing a mixture containing citric acid powder, solid iron, and water to dissolve it and produce iron citrate.

[0047] The amounts of citric acid, solid iron, and water used to produce the iron citrate described above are not particularly limited, but for example, the mass ratio of citric acid (assuming 100% purity): iron powder (assuming 100% purity): water (assuming 100% purity) can be adjusted within the range of 8-40:1-25:60-90, preferably 10-35:2-15:65-88, and optimally 15-30:2.5-10:70-85.

[0048] The above stirring and mixing conditions are not particularly limited, but it is necessary for the target substances to come into sufficient contact and for a chemical reaction to occur. For example, a dedicated stirring and mixing device such as a rotary blade stirrer may be used, or the substances may be stirred manually using a glass rod or paddle.

[0049] Furthermore, when preparing an aqueous solution of iron citrate, and / or when combining an aqueous solution of iron citrate with sodium bicarbonate, heating may be performed as necessary, and it is preferable to maintain the heating temperature at 150°C or lower, preferably 140°C or lower, and optimally 130°C or lower. If the heating temperature is 150°C or higher, the Fe in the aqueous solution will 3+ The ion concentration increases, therefore Fe in aqueous solution 2+ A phenomenon occurs where the ion concentration decreases.

[0050] On the other hand, the lower limit of the heating temperature is not particularly limited, for example, 40°C or higher, preferably 50°C or higher, and optimally 60°C or higher. The upper and lower limits of the temperature can be arbitrarily combined within the above range to set the temperature in the range of 40 to 150°C (preferably 50 to 140°C, optimally 60 to 130°C, or other combinations).

[0051] The above heating increases the amount of citric acid that dissolves, and consequently, the amount of iron that dissolves also increases, resulting in Fe in the aqueous solution. 2+ Ions or Fe 2+ The concentration of ionic complexes is increasing.

[0052] (Sodium ferric citrate production process) By adding baking soda (sodium bicarbonate) to the iron citrate aqueous solution produced in the above purification process and stirring, a growth-promoting iron supply agent, which is an aqueous solution of sodium iron citrate, is produced.

[0053] In the case of sodium ferric citrate, the amount added is adjusted so that it is 80 to 120 parts by weight per 100 ml of water, assuming a citric acid content of 100 parts by weight.

[0054] The following examples illustrate the growth status of plants after applying an iron-supplying agent for plant growth. The sodium iron citrate aqueous solution for irrigation was prepared by adding 150g of citric acid to 850ml of tap water to produce citric acid water, then adding 25g of reduced iron powder and stirring, followed by stirring and mixing in 150g of sodium bicarbonate.

[0055] Usage example 1 Figure 5 shows the growth status of molokhia as an example of plant cultivation, after 30 days of cultivation, with no iron supplement drenching (left side of the figure), ferric citrate aqueous solution (center of the figure), and sodium citrate aqueous solution as an iron supply agent for growth according to the present invention (right side of the figure), drenched once a week. Note that ferric citrate aqueous solution and sodium ferric citrate aqueous solution are The total iron content was 15,000 ppm each, Fe 2+ The solutions were prepared by diluting iron citrate at 3000 ppm and sodium iron citrate at 12500 ppm, with each solution being diluted 10,000 times. In molokhia plants treated with sodium ferric citrate, improved root development and an increase in the weight of the above-ground portion were observed compared to other plants.

[0056] Usage example 2 Figure 6 shows the growth status of Japanese mustard spinach (komatsuna) as an example of plant cultivation, after 23 days of cultivation, with no iron supplement drenching (left side of the figure), iron citrate aqueous solution (center of the figure), and sodium citrate aqueous solution (right side of the figure), used as an iron supply agent for growth according to the present invention, drenched once a week. Note that the iron citrate aqueous solution and sodium iron citrate aqueous solution are The total iron content was 15,000 ppm each, Fe 2+ The solutions were prepared by diluting iron citrate at 3000 ppm and sodium iron citrate at 12500 ppm, with each solution being diluted 10,000 times. In komatsuna (Japanese mustard spinach) treated with sodium ferric citrate, root development improved and an increase in the weight of the above-ground parts was observed compared to other samples.

[0057] Usage example 3 Figure 7 shows the growth status of okra as a cultivation example, after 19 days of cultivation, with no iron supplement drenching (left side of the figure), ferric citrate aqueous solution (center of the figure), and sodium citrate aqueous solution (right side of the figure), used as an iron supply agent for growth according to the present invention, drenched once a week. Note that ferric citrate aqueous solution and sodium ferric citrate aqueous solution are The total iron content was 15,000 ppm each, Fe 2+ The solutions were prepared by diluting iron citrate at 3000 ppm and sodium iron citrate at 12500 ppm, with each solution being diluted 10,000 times. Okra plants treated with sodium ferric citrate showed improved root development and an increase in the weight of the above-ground portion compared to other plants.

[0058] Usage example 4 Figure 8 shows the growth status of sunny lettuce as an example of plant cultivation, after 19 days of cultivation, with no iron supplement drenching (left side of the figure), ferric citrate aqueous solution (center of the figure), and sodium citrate aqueous solution as an iron supply agent for growth according to the present invention (right side of the figure), drenched once a week. Note that ferric citrate aqueous solution and sodium ferric citrate aqueous solution are, The total iron content was 15,000 ppm each, Fe 2+ The solutions were prepared by diluting iron citrate at 3000 ppm and sodium iron citrate at 12500 ppm, with each solution being diluted 10,000 times. In sunny lettuce plants treated with sodium ferric citrate, root development improved and an increase in the weight of the above-ground portion was observed compared to other plants.

[0059] Usage example 5 Figure 9 shows the growth status of parsley as an example of plant cultivation, after 19 days of cultivation, with no iron supplement drenching (left side of the figure), ferric citrate aqueous solution (center of the figure), and sodium citrate aqueous solution as an iron supply agent for growth according to the present invention (right side of the figure), drenched once a week. Note that ferric citrate aqueous solution and sodium ferric citrate aqueous solution are The total iron content was 15,000 ppm each, Fe 2+ The solutions were prepared by diluting iron citrate at 3000 ppm and sodium iron citrate at 12500 ppm, with each solution being diluted 10,000 times. Parsley treated with sodium ferric citrate showed improved root development and increased weight of the above-ground portion compared to other plants.

[0060] Usage example 6 Figure 10 shows the growth status of Italian parsley as an example of plant cultivation, after 19 days of cultivation, with no iron supplementation (left side of the figure), ferric citrate aqueous solution (center of the figure), and sodium citrate aqueous solution as an iron supply agent for growth according to the present invention (right side of the figure), applied once a week. Note that ferric citrate aqueous solution and sodium ferric citrate aqueous solution are The total iron content was 15,000 ppm each, Fe 2+ The solutions were prepared by diluting iron citrate at 3000 ppm and sodium iron citrate at 12500 ppm, with each solution being diluted 10,000 times. Italian parsley treated with sodium ferric citrate showed improved root development and increased weight of the above-ground portion compared to other plants.

[0061] [Consideration] Based on the results of usage examples 1 through 6, we conclude the following: If we set the index for non-irrigation of iron to 100, the above-ground weight is 116 for irrigation with iron citrate solution and 209 for irrigation with sodium iron citrate solution, while the root weight is 134 for irrigation with iron citrate solution and 464 for irrigation with sodium iron citrate solution. These facts suggest that Fe is important for the growth of roots and above-ground parts. 2+ We believe that this contributes significantly to the problem.

[0062] In the iron growth agent and iron growth supply agent of this embodiment, a precipitate of organic iron acid salt is generated over time and due to temperature changes, resulting in Fe in the aqueous solution. 2+ To prevent a significant decrease in ion concentration, high Fe 2+ It can maintain ion concentration. Furthermore, it enables efficient uptake by plants and animals, while also preventing soil and water pollution.

[0063] In the method for producing the iron growth agent of this embodiment, the formation of organic acid iron salt precipitates due to the passage of time and temperature changes is suppressed, and high Fe 2+ This method allows for the efficient production of iron supplements for plant growth that have a low ion concentration and pose little risk of soil or water contamination.

Claims

1. Iron supplements for plant and animal growth, which supply iron as an essential trace element for plant and animal growth, It consists of an aqueous solution of sodium iron citrate, which is made by mixing citric acid, water, and iron to form iron citrate and adding sodium bicarbonate. The sodium iron citrate is characterized by having 10 g of citric acid (assuming a purity of 100%) per 100 ml of water to the citric acid solubility limit at the water temperature, 5 to 60 parts by mass of iron (assuming a purity of 100%) per 100 ml of water when the citric acid content is 100 parts by mass, and 80 to 120 parts by mass of sodium bicarbonate (assuming a purity of 100%) per 100 ml of water when the citric acid content is 100 parts by mass.

2. In claim 1, The iron citrate is an iron preparation for plant and animal growth characterized by a ratio of citric acid (assumed to be 100% pure), water (assumed to be 100% pure), and iron (assumed to be 100% pure) of 8-40:1-25:60-90.

3. In claim 1, The iron is an iron agent for plant and animal growth that is solid iron with an iron content of 50% by mass or more.

4. In claim 1, An iron preparation for plant and animal growth, made by adding a mildew inhibitor to an aqueous solution of sodium iron citrate.

5. In claim 4, The antifungal agent is an iron agent for plant and animal growth, which is 10% by mass or less of the total aqueous solution of sodium iron citrate.

6. a step of dissolving iron in a citric acid solution of citric acid and water in an amount of 10 g of citric acid (assuming 100% purity) per 100 ml of water to the citric acid solubility limit at the water temperature, and 5 to 60 parts by mass of iron (assuming 100% purity) per 100 ml of water, assuming that the citric acid content is 100 parts by mass; A step of producing sodium iron citrate by combining an aqueous solution of iron citrate with sodium bicarbonate (assumed to be 100% pure) in a ratio of 80 to 120 parts by mass per 100 ml of water, assuming a citric acid content of 100 parts by mass; 2. A method for producing an iron agent for growing animals and plants according to claim 1, comprising:

7. In claim 6, A method for producing an iron agent for plant and animal growth, characterized in that when dissolving iron in a citric acid aqueous solution to produce iron citrate, and / or when combining the iron citrate aqueous solution with sodium bicarbonate, the heating temperature is 150°C or less.

8. In claim 6, A method for manufacturing an iron agent for growing animals and plants, in which the iron is solid iron having an iron content of 50% by mass or more.

9. In claim 6, A method for producing an iron agent for growing animals and plants, comprising the step of adding an antifungal agent to the produced aqueous solution of sodium iron citrate.

10. 6. An iron supplying agent for the growth of animals and plants, comprising 5 to 95 mass % of the iron agent for the growth of animals and plants according to any one of claims 1 to 5, calculated as a completely dry mass.

11. In claim 10, An iron supply agent for the growth of animals and plants, in which an iron agent for the growth of animals and plants is supported on a porous material.

12. In claim 10, An iron supply agent for animal and plant growth, which is prepared by adding at least one of lipoic acid, various vitamins, components of Mn, Zn, Cu, Cr, Si, Mg, Ca, Co, Mo, Ni, and B, water-soluble compounds of S and Cl, and water-soluble metal salts to an iron agent for animal and plant growth in an amount of 30 parts by mass or less per 100 parts by mass of the iron agent for animal and plant growth.

13. In claim 10, An iron supply agent for the growth of animals and plants, in which at least one bulking agent selected from zeolite, compost, clay, peat, rice husks, diatomaceous earth, and biodegradable resin is added to the iron agent for the growth of animals and plants in an amount of 30 parts by mass or less per 100 parts by mass of the iron agent for the growth of animals and plants.

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