WO2012060438A1 - Scories sidérurgiques granulées augmentant le rendement du riz des rizières et supprimant la génération de méthane et d'oxyde nitreux, et procédé afférent - Google Patents

Scories sidérurgiques granulées augmentant le rendement du riz des rizières et supprimant la génération de méthane et d'oxyde nitreux, et procédé afférent Download PDF

Info

Publication number
WO2012060438A1
WO2012060438A1 PCT/JP2011/075427 JP2011075427W WO2012060438A1 WO 2012060438 A1 WO2012060438 A1 WO 2012060438A1 JP 2011075427 W JP2011075427 W JP 2011075427W WO 2012060438 A1 WO2012060438 A1 WO 2012060438A1
Authority
WO
WIPO (PCT)
Prior art keywords
steelmaking slag
paddy
less
methane
soil
Prior art date
Application number
PCT/JP2011/075427
Other languages
English (en)
Japanese (ja)
Inventor
伊藤　公夫
公一 遠藤
和之 犬伏
Original Assignee
新日本製鐵株式会社
国立大学法人千葉大学
住友商事株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 新日本製鐵株式会社, 国立大学法人千葉大学, 住友商事株式会社 filed Critical 新日本製鐵株式会社
Publication of WO2012060438A1 publication Critical patent/WO2012060438A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B5/00—Treatment of  metallurgical  slag ; Artificial stone from molten  metallurgical  slag 
    • C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G22/00—Cultivation of specific crops or plants not otherwise provided for
    • A01G22/20—Cereals
    • A01G22/22—Rice
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C05D9/02—Other inorganic fertilisers containing trace elements

Definitions

  • the present invention relates to a steelmaking slag grain that increases the yield of paddy rice and suppresses generation of methane gas and nitrous oxide gas, and a paddy rice cultivation method using the same.
  • Non-Patent Document 1 reports the following measures. Methanogens that generate methane prefer an anaerobic environment without oxygen. For this reason, by draining paddy water temporarily and exposing the paddy soil that has been irrigated directly to the air and drying it, oxygen is supplied to the soil, including the effect of cracks in the dried soil. it can. Thereby, the activity of methane producing bacteria can be suppressed and methane generation can be suppressed.
  • Non-Patent Documents 2 to 5 methane generation from paddy soil can be suppressed by adding steel slag as a by-product of iron making to paddy soil.
  • Non-Patent Document 2 reports that methane generation is suppressed by using a converter slag of 20 t / ha to 100 t / ha in a pot test of paddy rice.
  • Non-Patent Documents 3 and 5 silicic slag having a composition of CaO: 41.8%, SiO 2 : 33.5%, Fe 2 O 3 : 5.4% is used at 1 t / ha to 4 t / ha. A method for suppressing the generation of methane gas from paddy fields has been reported.
  • Non-Patent Document 4 also reports that when silicic slag was used at 2 t / ha to 10 t / ha, generation of methane gas was suppressed and rice yield was increased.
  • Non-Patent Document 6 it is effective not only for suppression of methane generation but also for suppression of nitrous oxide generation by water management of intermittent irrigation following intermittent drying. It has been reported that there is.
  • Methanogens that generate methane prefer an anaerobic environment without oxygen and prefer a low redox potential, so it is possible to suppress the methane production by methanogens by drying the inside.
  • paddy rice is subject to water stress and promotes the growth of roots due to the mid-drying.
  • the mid-drying period is too long, there is a problem that the paddy rice falls down due to drying.
  • middle drying starts about 40 days after rice planting.
  • Non-Patent Document 2 shows that a pot test shows that methane generation can be suppressed when a large amount of converter slag of 20 t / ha to 100 t / ha is added.
  • a large amount of converter slag of 20 t / ha to 100 t / ha is added.
  • using such a large amount of converter slag in an actual paddy field is extremely disadvantageous in terms of cost, and it is considered difficult to put it to practical use.
  • Non-Patent Documents 3 and 5 report that methane generation can be suppressed by adding 1 t / ha to 4 t / ha of siliceous slag to paddy soil. This siliceous slag is considered to be blast furnace slag in view of the reported composition.
  • Non-Patent Document 4 reports that when silicic slag was used at 2t / ha to 10t / ha, generation of methane gas was suppressed and rice yield increased.
  • the composition of siliceous slag described in Table 1 of Non-Patent Document 4 is the same as that of Non-Patent Documents 3 and 5 except for Fe 2 O 3 , and Active Iron and Free Iron's The values are the same in Non-Patent Documents 3, 4, and 5.
  • the composition value of Fe 2 O 3 described in Table 1 of Non-Patent Document 4 is 27. 6% is a typographical error.
  • Non-Patent Document 4 is considered to be a blast furnace slag having the same composition as Non-Patent Documents 3 and 5.
  • the siliceous slag used in Non-Patent Documents 3 to 5 to suppress methane generation from paddy field soil is blast furnace slag, and methane is used at a practical usage of several t / ha.
  • the generation suppression effect is reported when blast furnace slag is used.
  • several t / ha is set as a practical usage amount, for example, NPK fertilizer, rice straw, lime, etc. are generally applied at a usage amount up to a level of several t / ha, and are almost the same level. This is because the amount used up to this point was considered appropriate for farmers.
  • Steel slag generated from steelworks is roughly divided into two types: blast furnace slag and steelmaking slag.
  • the blast furnace slag is generated from the blast furnace in the process of making pig iron
  • the steelmaking slag is slag generated from subsequent steelmaking, that is, from a converter or hot metal pretreatment.
  • Non-Patent Document 2 reports suppression of methane generation from paddy soil using converter slag, which is a type of steelmaking slag, but the amount of converter slag used is too large and practical. I thought it was not.
  • steelmaking slag is a by-product generated in the iron making process, as with blast furnace slag, and thus it is a big challenge to suppress methane generation from paddy soil using steelmaking slag and increase rice yield.
  • Non-Patent Document 6 the water management of intermittent irrigation is effective not only for the suppression of methane generation but also for the suppression of nitrous oxide generation following mid-drying.
  • Non-Patent Documents 7, 8, and 9 cases where a large amount of nitrous oxide was generated as a result of experiments performed in China and the Philippines were also reported. ing. For this reason, it has been reported that the suppression effect of nitrous oxide only by water management of intermittent irrigation following mid-drying depends on the soil and environmental conditions as well as the suppression of methane generation.
  • Nitrous oxide can be generated by the action of nitrifying bacteria that are aerobic microorganisms (Non-patent Document 10) and by the action of denitrifying bacteria that are anaerobic microorganisms. Since methane generation is due to the action of anaerobic methane producers that prefer a low redox potential, it is assumed that methane suppression will increase if oxygen is supplied to the soil by drying the soil to inhibit the action of methane producers. Is done. On the other hand, there is a possibility that middle drying activates nitrifying bacteria of aerobic microorganisms to increase the generation of nitrous oxide, and it is considered difficult to suppress the generation of nitrous oxide only by water management. As described above, there is no established technology for nitrous oxide suppression methods from paddy fields.
  • the present invention aims to provide a steelmaking slag grain and method for increasing the yield of paddy rice and suppressing the generation of methane gas and nitrous oxide gas.
  • One embodiment of the present invention is obtained by crushing a steelmaking slag containing 20 to 200 mg / g of available silicic acid and 10 to 30 mg / g of EDTA-eluting iron, and the steelmaking slag.
  • the steelmaking slag grain according to (1) above wherein the composition of the steelmaking slag is in mass%, Fe 2 O 3 : 10% to 30%, SiO 2 : 10% to 30%, MnO: 2% to 10%, Total sulfur content: 0% to 0.5%, CaO: 20% to 50%, P 2 O 5 : 1.5% to 5%, MgO: 1% to 8% The following may be included.
  • the steelmaking slag grain according to the above (1) or (2) the steelmaking slag grain may have a particle size of 10 mm or less.
  • Another aspect of the present invention is a paddy rice to which the steelmaking slag grain according to any one of (1) to (3) is applied to paddy soil at 0.5 t / ha or more and 5 t / ha or less. It is a cultivation method.
  • the initial pH of the paddy soil may be 4 or more and 6.5 or less.
  • the steelmaking slag grains may be applied before tilling, before plowing, or both.
  • the present invention it is possible to modify paddy soil using steelmaking slag grains, increase the yield of paddy rice, and suppress the generation of methane gas and nitrous oxide gas. For this reason, the stable supply of food can be aimed at, suppressing the global warming by paddy field cultivation using an iron manufacture by-product.
  • Steelmaking slag is obtained as converter slag, hot metal pretreatment slag, dephosphorization slag, etc. in the iron making process.
  • a steelmaking slag having a content of available silicic acid of 20 mg / g or more and 200 mg / g or less and an EDTA (ethylenediaminetetraacetic acid) -eluting iron content of 10 mg / g or more and 30 mg / g or less.
  • EDTA ethylenediaminetetraacetic acid
  • Fe 2 O 3 10% to 30%
  • SiO 2 10% to 30%
  • MnO 2% to 10%
  • total sulfur content (TS) 0. 5% or less (including 0%)
  • CaO 20% to 50%
  • P 2 O 5 1.5% or more than 5%
  • MgO using steel slag with a composition comprising 1% or more and 8% or less .
  • Non-patent Document 11 the content of available silicic acid when analyzed using a cation exchange resin extraction method.
  • Non-Patent Document 11 concerning this cation exchange resin method, it is reported that Amberlite (registered trademark of Rohm and Haas) IRC-50 is used as the cation exchange resin, but the production is discontinued. . Therefore, as an alternative, a cation exchange resin having a similar pK value, such as Amberlite FPC3500, can be used.
  • the available silicic acid means a chemical form of silicic acid that is absorbed by paddy rice, and the amount thereof is generally different from the amount of SiO 2 shown in the composition of steelmaking slag. Accordingly, the amount of SiO 2 in the composition of slag is only one guideline, and the content of available silicic acid in the slag that can be actually absorbed by plants is important. Steelmaking slag has a high content of available silicic acid compared to blast furnace slag.
  • Supplied silicic acid has the effect of preventing the lodging by making the stem of the paddy rice strong by being taken into the rice from the root. It also has the effect of increasing the uprightness of the leaves, increasing the light reception in the leaves of sunlight, and enhancing photosynthesis. Furthermore, due to these effects, available silicic acid has the effect of increasing the yield of rice.
  • the available silicic acid supplied from the steelmaking slag applied to the paddy field has the effect of promoting the growth of diatoms that inhabit the paddy water, mainly on the soil surface, in addition to being absorbed from the roots of paddy rice.
  • Diatoms can supply oxygen to the paddy soil surface by photosynthesis.
  • the soil surface of a paddy field becomes an aerobic environmental condition, and it has the effect which suppresses the fall of oxidation-reduction potential, and suppresses the methane generation
  • the content of available silicic acid in steelmaking slag is less than 20 mg / g, the effect of increasing the yield of paddy rice even when the maximum amount (for example, 5 t / ha) of steelmaking slag is applied to paddy soil. Is no longer allowed.
  • the growth effect due to the supply of available silicic acid to the diatoms that inhabit the paddy water is not expected. Therefore, it is necessary that the content of available silicic acid in steelmaking slag applied to paddy soil is 20 mg / g or more.
  • the maximum value was 200 mg / g. Therefore, steelmaking slag containing more than 200 mg / g of available silicic acid is not readily available in the ironmaking process. Therefore, the content of available silicic acid in the steelmaking slag used in the present embodiment is set to 20 mg / g or more and 200 mg / g or less.
  • Iron contained in steelmaking slag generally takes a chemical form such as Fe 2 O 3 , FeO, etc., and is not easily eluted even when applied to paddy soil, and is not absorbed from the roots of rice.
  • acidification by organic acids generated by soil microorganisms in paddy fields and acidification by root acids such as mugineic acid secreted by rice roots promotes elution of trivalent and divalent iron ions from steelmaking slag.
  • the Trivalent iron ions are neutral to alkaline, and divalent iron ions are alkaline and precipitate as hydroxides.
  • root acid such as mugineic acid secreted by rice roots and fulvic acid, which is a humic substance contained in soil organic matter, can chelate eluted trivalent iron ions and divalent iron ions to keep them stable. it can.
  • root acids such as mugineic acid secreted by rice roots chelate trivalent iron ions eluted from steelmaking slag and promote absorption of iron from the roots.
  • divalent iron ion is directly absorbed by the root in paddy rice roots (non-patent literature). 12).
  • the steelmaking slag used in the present embodiment is analyzed using the iron content eluted with EDTA, as reported in Non-Patent Document 13, and the content of EDTA-eluting iron is 10 mg / g or more and 30 mg. Steelmaking slag that is / g or less is used.
  • the content of EDTA-eluting iron in the steelmaking slag is less than 10 mg / g, even when the maximum amount of steelmaking slag is applied to the paddy field soil, for example, 5 t / ha, The amount of iron required for absorption cannot be supplied. In addition, it is not possible to supply a sufficient amount of iron for detoxifying the hydrogen sulfide generated by sulfate-reducing bacteria in the ground of paddy soil, which may inhibit root growth. Therefore, the content of EDTA-eluting iron in the steelmaking slag needs to be 10 mg / g or more. It has also been reported that iron toxicity appears in paddy rice when iron is supplied to paddy rice in excess.
  • the content of EDTA-eluting iron in steelmaking slag used in this embodiment is set to 10 mg / g or more and 30 mg / g or less.
  • Hot metal pretreatment slag, converter slag, secondary refining slag, etc. generated in the ironmaking process have different contents of available silicic acid and EDTA-eluting iron. It is possible to adjust to an amount.
  • Steelmaking slag contains iron as Fe 2 O 3 , FeO, and the like.
  • the iron content is expressed as Fe 2 O 3 . Therefore, the iron content of the steelmaking slag has not been analyzed up to the content of the EDTA-eluting iron, and in general, the Fe 2 O 3 content is often known as the iron composition value. Therefore, it is important to know a value that serves as a standard for determining whether or not to analyze EDTA-eluting iron based on the Fe 2 O 3 content.
  • the content of Fe 2 O 3 in steelmaking slag is less than 10% by mass, even when 5 t / ha steelmaking slag, which is the maximum application rate assumed in paddy fields, is applied, the yield of paddy rice increases. There is a high possibility that a sufficient amount of EDTA-eluting iron necessary for suppressing the generation of methane gas and nitrous oxide gas from paddy fields cannot be supplied. Therefore, the content of Fe 2 O 3 in the steelmaking slag is preferably 10% by mass or more. On the other hand, steelmaking slag whose Fe 2 O 3 content exceeds 30% by mass hardly occurs in the iron making process and is difficult to obtain. Therefore, it is preferable to use steelmaking slag of Fe 2 O 3 : 10% by mass or more and 30% by mass or less.
  • the iron content of the steelmaking slag is calculated by calculating total Fe 2 O 3 by measuring the total iron content by titration with titanium chloride (III) reduced potassium dichromate.
  • Mn exists mainly as MnO in steelmaking slag.
  • Paddy soil is deficient in oxygen and is generally anaerobic, so the redox potential tends to decrease due to, for example, the effects of hydrogen sulfide generated by sulfate-reducing bacteria.
  • polyvalent manganese ions have oxidizing power, they have the effect of increasing the redox potential of paddy soil.
  • Methanogens that generate methane are anaerobic microorganisms that prefer low redox potentials.
  • With the polyvalent manganese ions derived from manganese oxide supplied from steelmaking slag it is possible to increase the redox potential of paddy field soil and prevent methane production by methanogens.
  • the MnO content is less than 2% by mass, there is a possibility that elution of polyvalent manganese sufficient to raise the redox potential of paddy soil does not occur. Therefore, the MnO content is preferably 2% by mass or more. Moreover, since the steelmaking slag whose MnO content exceeds 10 mass% hardly occurs in the iron making process, it is difficult to obtain. Therefore, the MnO content is preferably 2% by mass or more and 10% by mass or less. It should be noted that an excessive amount of manganese may cause excess manganese as reported in Non-Patent Document 14.
  • the content of MnO contained in the steelmaking slag can be measured by, for example, fluorescent X-ray analysis.
  • Si exists mainly as SiO 2 in the steelmaking slag.
  • Steelmaking slag elutes available silicic acid that is easily absorbed by paddy rice, and has a fertilizer effect that increases the yield of rice by making the stem and leaves of paddy rice strong and preventing lodging.
  • steelmaking slag contains a lot of available silicic acid, it has the effect
  • the content of SiO 2 contained in the steelmaking slag for example, can be measured by X-ray fluorescence analysis.
  • the total sulfur content (TS) content of the steelmaking slag is preferably 0.5% by mass or less. If TS exceeds 0.5% by mass, the redox potential of the S 2 ⁇ may decrease and the generation of methane by the methanogenic bacteria may not be suppressed.
  • the content of TS contained in the steelmaking slag can be measured by, for example, high-frequency heating combustion in an oxygen stream-infrared absorption method.
  • Ca contained in steelmaking slag is represented by the composition of CaO.
  • steelmaking slag having a CaO content of less than 20% by mass or steelmaking slag having a CaO content of more than 50% by mass hardly occurs in the iron making process, and is difficult to obtain.
  • CaO is a major causative component of alkalinity due to slag. Therefore, in this embodiment, it is preferable that the CaO content of the steelmaking slag is 20% or more and 50% or less.
  • content of CaO contained in steelmaking slag can be measured by a fluorescent X ray analysis method, for example.
  • phosphorus (P), magnesium (Mg), and the like are included in the steelmaking slag. These will be described.
  • the content of phosphorus (P) in steelmaking slag is mainly expressed as a composition with P 2 O 5 .
  • Phosphorus is important as a fertilizer component of paddy rice.
  • Steelmaking slag having a P 2 O 5 content of less than 1.5% by mass or steelmaking slag having a P 2 O 5 content of more than 5% by mass hardly occur in the iron making process, and thus are difficult to obtain. Therefore, the P 2 O 5 content is preferably 1.5% by mass or more and 5% by mass or less.
  • the content of P 2 O 5 contained in steelmaking slag for example, can be measured by X-ray fluorescence analysis.
  • Mg In steelmaking slag, the Mg content is expressed as the composition of MgO.
  • MgO steelmaking slag having an MgO content of less than 1% by mass or steelmaking slag having an MgO content of more than 8% by mass is hardly generated in the iron making process and is difficult to obtain. Therefore, the MgO content is preferably 1% by mass or more and 8% by mass or less.
  • the content of MgO contained in the steelmaking slag can be measured by, for example, fluorescent X-ray analysis.
  • the steelmaking slag 1 can be used as it is.
  • powder 2 obtained by crushing steelmaking slag 1 may be used.
  • particles 4 obtained by combining the powder 2 with a binder 3 to form particles may be used.
  • the binder 3 may be any material as long as it is used for granulation of fertilizer, and examples thereof include lignin sulfonic acid.
  • (1) the steelmaking slag 1 or (2) the powder 2 obtained by crushing the steelmaking slag 1, or (3) the powder 2 is bonded by the binder 3 and applied to the paddy field.
  • any one or more of the formed particles 4 is referred to as a steelmaking slag particle.
  • the particle size of the steelmaking slag grain is high in the elution efficiency of the steelmaking slag-containing component and has good operability when carrying out agricultural work such as scratching in paddy soil, a smaller particle size is preferable. For this reason, it is desirable that the particle diameter of the steelmaking slag grains is 10 mm or less. Although it is not always necessary to provide a lower limit to the particle diameter of the steelmaking slag particles, particles having a diameter of 0.01 mm or less are difficult to granulate or use, and therefore the lower limit may be set to 0.01 mm.
  • the steelmaking slag grains of the present embodiment may be particles made of only one or more of the steelmaking slag 1, its powder 2, and the binder 3.
  • Non-Patent Document 2 reports that there was an effect of suppressing methane generation by adding converter slag of 20 t / ha or more to soil. However, in this embodiment, compared to Non-Patent Document 2, the amount of steelmaking slag used is 1 ⁇ 4 or less, which is advantageous in terms of cost.
  • the steelmaking slag grains for paddy field soil modification having the composition of the present embodiment are added to the paddy field soil. It is preferable to add 5 t / ha or more and 5 t / ha or less.
  • the initial pH of paddy field soil indicates the pH of the soil before applying the steelmaking slag grains.
  • This initial pH is preferably pH 4 or more and 6.5 or less.
  • Steelmaking slag has the effect of making it alkaline by the action of the contained CaO. Therefore, when the pH of the original paddy soil is higher than 6.5, it may become an alkaline environment that is not suitable for growing rice. Moreover, in the soil of pH lower than pH 4, even if it uses the steelmaking slag grain for paddy field soil modification
  • the pH of the paddy soil to which steelmaking slag grains are added is pH 4 or more and 6.5 or less. Even if the initial pH of the soil is outside the above pH range, it is neutralized by the action of HCO 3 ⁇ supplied by CO 2 dissolved from the air or respiration by soil microorganisms after flooding. It is possible to apply the steelmaking slag grain for paddy field soil improvement of an embodiment to a paddy field.
  • Methanogens that generate methane are anaerobic microorganisms that prefer low redox potentials. Therefore, it is possible to increase the redox potential of paddy soil by trivalent iron ions acting as an oxidant and prevent methane production by methane-producing bacteria.
  • nitrifying bacteria as aerobic microorganisms and denitrifying bacteria as anaerobic microorganisms are known as microorganisms that generate nitrous oxide, which is a greenhouse gas.
  • Nitrifying bacteria are aerobic microorganisms and require oxygen as an electron acceptor.
  • the oxidizing power of trivalent iron ions supplied from steelmaking slag is smaller than that of oxygen, and nitrifying bacteria cannot use trivalent iron ions as electron acceptors.
  • dry-drying which has been reported to have an effect of suppressing methane generation, since oxygen is supplied to the soil, the promotion of nitrous oxide generation is a problem due to the activity of nitrifying bacteria (Non-patent Document 10).
  • nitrous oxide by denitrifying bacteria ammonium nitrate and urea are mainly used as nitrogenous fertilizers in paddy field soil, so urea is also microbially decomposed and ammonia nitrogen becomes fertilizer components. Therefore, the production of nitrate nitrogen and nitrite nitrogen by the action of nitrifying bacteria makes it possible to obtain a substrate for denitrifying bacteria for the first time. Therefore, in the method of the present embodiment, unlike oxygen supply by drying in the middle, the supply of trivalent iron ions suppresses the growth and activity of nitrifying bacteria, resulting in the effect of suppressing nitrous oxide generation by denitrifying bacteria. There is.
  • the effect of increasing the number of stalks of paddy rice and the effect of increasing the height of the rice plant can be expected by adding the steelmaking slag grains for paddy field soil modification having the composition of the present embodiment to the paddy field soil.
  • nitrogen (N) fertilizer is deficient due to the growth promotion of rice before the formation of rice ears, which does not lead to an increase in rice yield thereafter.
  • nitrogen (N), phosphorus (P), and potassium (K) should be added as the basic fertilizer before planting.
  • the leaf color of paddy rice should be checked with a Leaf Color Chart or SPAD meter.
  • N It is preferable to add fertilizer as appropriate, mainly fertilizer. However, caution is required because excessive nitrogen (N) fertilizer causes nitrous oxide generation.
  • Table 1 shows the composition of steelmaking slag grains.
  • 11 types of steelmaking slag grains shown in Table 1 having a particle size of 10 mm or less were seeded at 0.1 t / ha, 0.5 t / ha, 5 t / ha, 10 t / ha.
  • the composition of the steelmaking slag used was, in mass%, Fe 2 O 3 : 10% to 30%, SiO 2 : 10% to 30%, MnO: 2% to 10%, total sulfur content ( (TS): 0.5% or less (including 0%), CaO: 20% to 50%, P 2 O 5 : 1.5% to 5%, MgO: 1% to 8% A thing was used.
  • a paddy field without steelmaking slag grains was also prepared as a control plot.
  • the initial pH of the paddy soil was pH 6.
  • NPK fertilizer (horticultural spirit fertilizer 8-8-8 Nihon Daiphosca) was applied at 1 t / ha, Paddy rice was grown. Cover a rice plant for 15 minutes using a 40 cm long x 40 cm wide x 100 cm high acrylic chamber every week, collect the gas inside every 5 minutes, and use a gas chromatograph with a flame ionization detector. The amount of methane generated and the amount of nitrous oxide generated were measured using a gas chromatograph equipped with an electron capture detector. The gas sampling by the chamber method was performed from morning to 2 pm with the same time between each test. In addition, the yield (14% wet mass) of rice harvested after 4 months was measured.
  • Table 2 shows test results of rice yield (14% wet mass).
  • Table 3 shows the amount of methane generated per paddy rice crop, where the test result of the amount of methane generated when steelmaking slag grains are not applied (control group) is taken as 1 It is a test result of the amount of methane generated.
  • Table 4 shows the amount of nitrous oxide generated per paddy rice crop, and the results of various steelmaking slag grains showing the test result of the amount of nitrous oxide generated when steelmaking slag is not applied (control group) as 1. It is a test result of the amount of nitrous oxide generated in the test section to which No. 1 was applied.
  • steelmaking slag granules 7 and 9 having a content of EDTA-eluting iron exceeding 30 mg / g are 0.1 t / ha, 0.5 t / ha, 5 t / ha, 10 t / In any case of ha application, there was no clear increase in sales compared to the non-application control group. Further, for steelmaking slag grains 8 and 11 having an EDTA-eluting iron content of less than 10 mg / g and 5 mg / g, either 0.1 t / ha, 0.5 t / ha, 5 t / ha, or 10 t / ha is applied. In this case, there was no clear increase in sales compared to the non-application control group.
  • the steelmaking slag grains containing available silicic acid in the range of 20 mg / g to 200 mg / g and EDTA-eluting iron in the range of 10 mg / g to 30 mg / g increase the yield of paddy rice, suppress methane generation, and suboxidation. Nitrogen generation suppression was confirmed.
  • Example 2 ⁇ pH of paddy field soil In each 5m x 4m paddy field where the initial pH of the soil is 3.5, 4, 4.5, 5.5, 6.5, 7 respectively, the particle size is 10mm with 1 steelmaking slag grains listed in Table 1 2 t / ha of the following was spread.
  • the composition of the used steelmaking slag grain 1 was Fe 2 O 3 : 10% to 30%, SiO 2 : 10% to 30%, MnO: 2% in mass%. 10% or less, total sulfur content (TS): 0.5% or less (including 0%), CaO: 20% or more and 50% or less, P 2 O 5 : 1.5% or more and 5% or less, MgO 1% or more and 8% or less.
  • Table 5 shows the test results of rice yield (14% wet mass).
  • Example 3 Test on the time to apply steelmaking slag grains to paddy field soil 5m x 4m paddy field 2 months before tillage, 2 weeks before tillage, at the time of tilling (2 weeks before planting)
  • 2 steelmaking slag grains shown in Table 1 having a particle size of 10 mm or less were sprinkled at 2 t / ha, respectively.
  • the composition of the used steelmaking slag particles of 2 was Fe 2 O 3 : 10% to 30%, SiO 2 : 10% to 30%, MnO: 2% in mass%.
  • Paddy rice seedlings were planted and submerged, and NPK fertilizer (horticultural spirit fertilizer 8-8-8 Nippon Daifuka) was fertilized at 1 t / ha to grow paddy rice.
  • NPK fertilizer horticultural spirit fertilizer 8-8-8 Nippon Daifuka
  • the amount of methane generated and the amount of nitrous oxide generated were measured using a gas chromatograph equipped with an electron capture detector.
  • the gas sampling by the chamber method was performed from morning to 2 pm with the same time between each test.
  • the yield (14% wet mass) of the rice harvested after about 4 months was measured.
  • Table 6 shows the test results of rice yield (14% wet mass). Yield is 5.6 t / ha when steelmaking slag grain is applied 2 months before tillage, 5.3 t / ha when applied 2 weeks before tillage, and at the time of tillage (2 weeks of rice planting) It was 5.1 t / ha when applied before), 4.3 t / ha when applied at the time of rice planting, and 4.1 t / ha when applied two weeks after rice planting. On the other hand, it was 3.8 t / ha in the control group in which the steelmaking slag grains were not applied.
  • Table 7 shows the amount of methane generated per rice crop.
  • Table 8 shows the amount of nitrous oxide generated per paddy rice.
  • Example 4 Test on the effect of the particle size of steelmaking slag grains
  • Each 1 m steelmaking slag grain described in Table 1 in a 5 m x 4 m paddy field (1) grain size of 10 mm or less (substantially the smallest grain size) Is about 0.01 mm), (2) greater than 10 mm and less than 25 mm, and (3) greater than 25 mm, 2 t / ha.
  • the composition of the used steelmaking slag grain 1 was Fe 2 O 3 : 10% to 30%, SiO 2 : 10% to 30%, MnO: 2% in mass%.
  • NPK fertilizer (horticultural spirit fertilizer 8-8-8, Nippon Daiphosca) was fertilized at 1 t / ha.
  • Table 9 shows the test results of rice yield (14% wet mass).
  • Table 10 shows the amount of methane generated per rice crop.
  • Table 11 shows the amount of nitrous oxide generated per paddy rice production.
  • steelmaking slag grains can be used to improve paddy soil, increase the yield of paddy rice, and suppress the generation of methane gas and nitrous oxide gas.
  • a stable supply of food can be achieved while suppressing global warming due to paddy field cultivation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Botany (AREA)
  • Environmental Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Fertilizers (AREA)

Abstract

Cette invention concerne des scories sidérurgiques granulées comprenant une ou plusieurs scories sidérurgiques contenant de 20 à 200 mg/g d'acide silicique pouvant être apportés et de 10 à 30 mg/g de fer libéré par l'EDTA ; des poudres obtenues par concassage desdites scories sidérurgiques, et des particules obtenues par liaison des poudres à l'aide d'un liant.
PCT/JP2011/075427 2010-11-05 2011-11-04 Scories sidérurgiques granulées augmentant le rendement du riz des rizières et supprimant la génération de méthane et d'oxyde nitreux, et procédé afférent WO2012060438A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2010-248938 2010-11-05
JP2010248938A JP5881286B2 (ja) 2010-11-05 2010-11-05 製鋼スラグ粒を用いた水稲の収量を増加させ、かつ、メタンガスと亜酸化窒素ガスの発生を抑制する方法

Publications (1)

Publication Number Publication Date
WO2012060438A1 true WO2012060438A1 (fr) 2012-05-10

Family

ID=46024551

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/075427 WO2012060438A1 (fr) 2010-11-05 2011-11-04 Scories sidérurgiques granulées augmentant le rendement du riz des rizières et supprimant la génération de méthane et d'oxyde nitreux, et procédé afférent

Country Status (2)

Country Link
JP (1) JP5881286B2 (fr)
WO (1) WO2012060438A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015097975A1 (fr) * 2013-12-24 2015-07-02 Ｊｆｅスチール株式会社 Matériau de fourniture d'ions fer
WO2022260019A1 (fr) * 2021-06-07 2022-12-15 Ｊｆｅスチール株式会社 Poudre à base de fer pour une utilisation d'alimentation en ion de fer et matériau d'amélioration de la croissance végétale la comprenant

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2707811C1 (ru) * 2017-06-28 2019-11-29 Ниппон Стил Корпорейшн Сталеплавильный шлак в качестве сырья для удобрения, способ производства сталеплавильного шлака в качестве сырья для удобрения, способ производства удобрения и способ применения удобрения
CR20190160A (es) 2017-06-28 2019-05-16 Nippon Steel & Sumitomo Metal Corp Escoria de acero para materia prima de fertilizante, método para la producción de escoria de acero para materia prima de fertilizante, método para la producción del fertilizante y método de aplicación del fertilizante.
JP7530232B2 (ja) 2020-08-07 2024-08-07 株式会社フジタ 堆肥
KR102576821B1 (ko) * 2021-07-23 2023-09-08 경상국립대학교산학협력단 리그닌, 휴믹산 또는 이들의 철 복합체를 유효성분으로 함유하는 메탄가스 발생 저감용 조성물

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01226785A (ja) * 1988-03-07 1989-09-11 Mitsubishi Mining & Cement Co Ltd 珪酸カルシウム肥料組成物
JPH01320286A (ja) * 1988-06-23 1989-12-26 Nisshin Steel Co Ltd スラグ肥料の製造方法
JP2005177646A (ja) * 2003-12-19 2005-07-07 Jfe Steel Kk 水底におけるメタンガスの発生防止方法及び有機性沈積物の処理方法
JP2008100915A (ja) * 2000-01-14 2008-05-01 Nippon Steel Corp 珪酸質肥料の製造方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6117483A (ja) * 1984-07-02 1986-01-25 中川　健一 珪酸カリ肥料の製造方法
JPH07121836B2 (ja) * 1987-04-27 1995-12-25 日本化学工業株式会社 土壌改良肥料
JPH1161119A (ja) * 1997-08-21 1999-03-05 Sumitomo Metal Ind Ltd 酸性重粘質土壌用改良材
JP4818092B2 (ja) * 2006-07-28 2011-11-16 新日本製鐵株式会社 製鋼スラグ中フッ素の溶出抑制方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01226785A (ja) * 1988-03-07 1989-09-11 Mitsubishi Mining & Cement Co Ltd 珪酸カルシウム肥料組成物
JPH01320286A (ja) * 1988-06-23 1989-12-26 Nisshin Steel Co Ltd スラグ肥料の製造方法
JP2008100915A (ja) * 2000-01-14 2008-05-01 Nippon Steel Corp 珪酸質肥料の製造方法
JP2005177646A (ja) * 2003-12-19 2005-07-07 Jfe Steel Kk 水底におけるメタンガスの発生防止方法及び有機性沈積物の処理方法

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ALI MUHAMMAD ASLAM ET AL.: "Evaluation of silicate iron slag amendment on reducing methane emission from flood water rice farming", AGRIC ECOSYST ENVIRON, vol. 128, no. 1-2, October 2008 (2008-10-01), pages 21 - 26 *
FURUKAWA Y ET AL.: "Effect of Application of Iron Materials on Methane and Nitrous Oxide Emissions from Two Types of Paddy Soils", SOIL SCI PLANT NUTR, vol. 50, no. 6, December 2004 (2004-12-01), pages 917 - 924 *
FURUKAWA Y ET AL.: "Evaluation of Slag Application to Decrease Methane Emission from Paddy Soil and Fate of Iron", SOIL SCI PLANT NUTR, vol. 50, no. 7, December 2004 (2004-12-01), pages 1029 - 1036 *
TAKUHITO NOZOE ET AL.: "Kosai Gantetsu Shizai ga Suiden Dojo no Sanka Kangen Den'i (Eh) no Henka ni Oyobosu Eikyo", NOGYO KANKYO GIJUTSU KENKYUSHO NENPO (HEISEI 12 NENDO), 22 February 2002 (2002-02-22), pages 86 - 89 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015097975A1 (fr) * 2013-12-24 2015-07-02 Ｊｆｅスチール株式会社 Matériau de fourniture d'ions fer
JP2015119685A (ja) * 2013-12-24 2015-07-02 Ｊｆｅスチール株式会社 鉄イオン供給材料
CN105813452A (zh) * 2013-12-24 2016-07-27 杰富意钢铁株式会社 铁离子供给材料
US10526254B2 (en) 2013-12-24 2020-01-07 Jfe Steel Corporation Iron-ion supply material
WO2022260019A1 (fr) * 2021-06-07 2022-12-15 Ｊｆｅスチール株式会社 Poudre à base de fer pour une utilisation d'alimentation en ion de fer et matériau d'amélioration de la croissance végétale la comprenant
JPWO2022260019A1 (fr) * 2021-06-07 2022-12-15
JP7468680B2 (ja) 2021-06-07 2024-04-16 Ｊｆｅスチール株式会社 鉄イオン供給用鉄基粉末およびそれを用いた植物育成改善材

Also Published As

Publication number Publication date
JP2012100541A (ja) 2012-05-31
JP5881286B2 (ja) 2016-03-09

Similar Documents

Publication Publication Date Title
Gupta et al. Greenhouse gas emission from rice fields: a review from Indian context
CN107446589B (zh) 一种酸性土壤镉钝化剂及其应用
Cao et al. Effects of wheat straw addition on dynamics and fate of nitrogen applied to paddy soils
CN101665699B (zh) 一种营养型果园酸化土壤改良剂及其制备方法与应用
Lee et al. Effect of Chinese milk vetch (Astragalus sinicus L.) as a green manure on rice productivity and methane emission in paddy soil
WO2012060438A1 (fr) Scories sidérurgiques granulées augmentant le rendement du riz des rizières et supprimant la génération de méthane et d'oxyde nitreux, et procédé afférent
Malyan et al. Mitigation of yield-scaled greenhouse gas emissions from irrigated rice through Azolla, Blue-green algae, and plant growth–promoting bacteria
CN107400512B (zh) 一种植物修复活化剂以及针对重金属复合污染土壤的植物修复方法
CN100462341C (zh) 有机氮肥
CN103626584B (zh) 一种植被混凝土绿化添加剂ab菌的制备方法
JPH0279910A (ja) 粒状天然ゼオライトを主成分とする混合園芸培土
CN104671923B (zh) 一种稻田甲烷减排的肥料及其施用方法
Lee et al. Different response of silicate fertilizer having electron acceptors on methane emission in rice paddy soil under green manuring
CN110590464A (zh) 一种四位一体全营养复合微生物肥料
CN106946611A (zh) 一种油橄榄有机肥
Riya et al. Mitigation of CH4 and N2O emissions from a forage rice field fertilized with aerated liquid fraction of cattle slurry by optimizing water management and topdressing
Singh et al. Methanogenesis and methane emission in rice/paddy fields
Abid et al. Nitrogen optimization coupled with alternate wetting and drying practice enhances rhizospheric nitrifier and denitrifier abundance and rice productivity
CN102766001B (zh) 一种稳定性水溶性肥料及其制备方法
Meshram et al. Total nitrogen uptake by maize with Azotobacter inoculation
Song et al. Negligible ammonia volatilization loss with one-time root-zone targeted application of common nitrogen, phosphorus, and potassium fertilizers in transplanted rice cultivation
Ramalingappa et al. Reducing options of ammonia volatilization and improving nitrogen use efficiency via organic and inorganic amendments in wheat (Triticum aestivum L.)
CN109548598A (zh) 利用水稻秸秆生物质炭保产增产并减少氨挥发排放的方法
CN106605482A (zh) 一种棉花的施肥方法
CN104402620A (zh) 一种花肥

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11838088

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11838088

Country of ref document: EP

Kind code of ref document: A1