AU2020103380A4 - Combined reagent and application method for reducing methane emission in rice field - Google Patents
Combined reagent and application method for reducing methane emission in rice field Download PDFInfo
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- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/22—Methane [CH4], e.g. from rice paddies
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Abstract
The invention provides a combined reagent for reducing methane emissions from rice fields,
including desulfurized gypsum, slag and biochar. Among them, desulfurized gypsum can
enhance the competitive advantage of sulfate reducing bacteria by providing sulfate radicals,
thereby inhibiting the production of methane. Slag and biochar can increase the number of
iron-reducing bacteria in rice soil, thereby reducing methane emissions. The present invention
also provides an application method of the combined agent. Compared with the gypsum
application method, the present invention employs an integrated water and fertilizer application
method at the booting period, so that the combined agent enters the soil together with water, and
the agent is more evenly distributed in the soil. And the rice booting period is the peak period of
methane emission, and the application of gypsum at this time is more conducive to controlling
methane emission.
Description
[0001] The disclosure relates to the technical field of agricultural preparations, in particular to a combined reagent for reducing methane emissions from rice fields, and an application method of the combined reagent.
[0002] Methane (CH 4) is an important greenhouse gas second only to carbon dioxide (C0 2 ), contributing about 18% to the greenhouse effect, and its single-molecule warming potential is 28 to 36 times that of CO 2 . Agricultural activities are the main source of greenhouse gases in the atmosphere, and rice fields are the most important agricultural source of CH4 . The annual CH4 emissions from rice fields account for about 10% of the total global CH4 emissions. Rice production has made outstanding contributions to ensuring global food security, but it has also increased the emissions of the greenhouse gas CH4 , which is a weak link in the response to global climate change. Therefore, how to coordinate the increase in food production and the reduction of greenhouse gas emissions has important theoretical and practical significance.
[0003] Flooding irrigation is an important reason for the huge CH4 emissions of rice fields. Alternate wet and dry irrigation is considered to be an important measure to achieve CH4 emission reduction and simultaneous growth of rice production. However, in the booting period when methane emissions are the most intense, the rice fields need to be flooded. This greatly weakens the ability of alternate dry and wet irrigation to reduce CH4 emissions from rice fields.
[0004] Desulfurized gypsum is a by-product of the recovery of SO 2 in flue gas by limestone slurry in industrial production, and is an important industrial raw material. Studies have shown that burying desulphurization gypsum in rice fields can reduce methane emissions from rice fields, but the amount is large, the cost is high, and the emission reduction effect is closely related to the soil texture. Sandy loam has a better effect, while clay loam has a poorer effect. If desulfurized gypsum can be co-applied with other reagents and combined with rice field water management, it will be of great significance for improving methane emissions from rice fields.
[0005] In view of this, the present invention is proposed.
[0006] The first object of the present invention is to provide a combined reagent for reducing methane emissions from rice fields.
[0007] The second object of the present invention is to provide a method of application of the combined agent.
[0008] In order to achieve the above objective, the technical solution of the present invention is as follows:
[0009] The invention relates to a combined reagent for reducing methane emissions from rice fields, comprising desulfurized gypsum, slag and biochar.
[0010] Preferably, the application rate of desulfurized gypsum in the combined reagent is 2 500-2000 kg/hm 2, the application rate of slag is 1500-3000 kg/hm, and the application rate of biochar is 1500-3000 kg/hm2 .
[0011] Preferably, for sandy loam soil, the application amount of desulfurized gypsum in the combined reagent is 1200~1500 kg/hm2 .
[0012] Preferably, for clay loam, the application amount of desulfurized gypsum in the 2 combined reagent is 800-1000 kg/hm2
[0013] Preferably, the application rates of slag and biochar are both 2500 kg/hm2
[0014] The present invention also relates to the application method of the combined reagent, comprising the following steps:
[0015] (1) During the transplanting-returning period of rice, irrigating the rice field until the water depth is about lcm, keeping the water depth of the field should at about 2cm within 5-7 days after transplanting;
[0016] (2) During the effective tillering period of rice, there is no visible water layer on the field surface, keeping the soil water content at 70%~80% of the saturated water content;
[0017] (3) In the invalid tillering period of rice, re-irrigating the field until the crack width reaches 1-2cm until the field depth is about 2cm;
[0018] Preferably, for sandy loam soil, re-irrigating water when the width of the cracks on the field surface reaches about 2 cm from the drying field; for clay loam, re-irrigating the field until the crack width of the field reaches about 1 cm.
[0019] (4) Mixing the combination reagent with irrigation water evenly and applying it into the rice field in the booting period of rice. Maintaining the water depth of the field at 1~3 cm by irrigation during the whole booting period;
[0020] Preferably, for sandy loam soil, the irrigation amount at the booting period is 800-1000 t/hm 2. For clay loam, the irrigation amount at the booting period is 600-800 t/hm2 .
[0021] Preferably, after mixing the combined reagent and irrigation water into the rice field, if the field surface water depth is less than 3 cm, then continuing to irrigate until the water depth reaches about 3 cm, and not to add the combined reagent in this process.
[0022] (5) At the heading and maturity period of rice, after irrigating the rice field to a depth of 3-5cm, irrigating the rice field again when the water is dried in air and the soil water potential is -25kPa, not to add a combined reagent in this process.
[0023] The beneficial effects of the present invention:
[0024] The invention provides a combined reagent for reducing methane emissions from rice fields, comprising desulfurized gypsum, slag and biochar. Among them, desulfurized gypsum can enhance the competitive advantage of sulfate reducing bacteria by providing sulfate radicals, thereby inhibiting the production of methane. Slag and biochar can increase the number of iron-reducing bacteria in rice soil, thereby reducing methane emissions.
[0025] The present invention also provides an application method of the combined agent. Compared with the gypsum application method, the present invention employs an integrated water and fertilizer application method at the booting period, so that the combined agent enters the soil together with water, and the agent is more evenly distributed in the soil. And the rice booting period is the peak period of methane emission, and the application of gypsum at this time is more conducive to controlling methane emission.
[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, other embodiments obtained by those people skilled in the art without creative work shall fall within the protection scope of the present invention.
[0027] The embodiment of the present invention relates to a combined reagent for reducing methane emissions from rice fields, including desulfurized gypsum, slag, and biochar.
[0028] Among them, desulfurized gypsum is a by-product of calcium hydroxide slurry absorbing sulfur dioxide in industrial flue gas, and the main component is a mixture of dihydrate gypsum and calcium sulfite. Desulfurized gypsum can provide sulfate. Under the condition of the coexistence of sulfate-reducing bacteria and methanogenic bacteria in the soil, the competitive advantage of sulfate-reducing bacteria can be enhanced by increasing sulfate, thereby inhibiting the production of methane. Slag is the waste slag discharged from coal burning in industrial and civil boilers and other equipment. The main components are SiO 2
(27.5%), CaO (35.3%), SO 3 (1.4%), Fe 2 03 (6.3%), P 2 05 (0.11%), MgO (4.2%) and K 2 0 (2.8%). Biochar is obtained by carbonizing wood, grass, corn stalks or other crop wastes through pyrolysis in a low-oxygen environment. It mainly contains N (1.46%), P (1.02%), K (1.84%), C (55.82%), S (0.62%), Mg (1.12%), Ca (0.49%) and Fe (0.18%). The above-mentioned biochar can increase the number of iron-reducing bacteria in the rice soil, and the slag provides Fe (), which is more competitive than CO 2 as an electron acceptor, thereby reducing methane emissions.
[0029] In an embodiment of the present invention, the application rate of desulfurization gypsum in the combined reagent is 500-2000 kg/hm 2 , the application rate of slag is 1500-3000 kg/hm 2, and the application rate of biochar is 1500-3000 kg/hm2 . Among them, /hm 2 means square kilometers.
[0030] In an embodiment of the present invention, for sandy loam, the application amount of desulfurized gypsum in the combined reagent is 1200~1500 kg/hm.2
[0031] In an embodiment of the present invention, for clay loam, the application amount of desulfurized gypsum in the combined reagent is 800-1000 kg/hm2
[0032] Among them, for planting soil, usually the clay with more than 80% is called clay, about 60% is called clay loam, about 40% is called sandy loam, and about 20% is called sand. Sandy loam refers to soil with moderate content of clay, silt and sand in the soil particle composition, its nature lies between loam and sand, and the soil nutrient content is relatively high. Due to the good permeability of sandy loam soil, gypsum is easy to mix, and it is easy to disperse to different depths of soil after irrigation. The sulfate contained in gypsum easily causes soil compaction, so gypsum is difficult to mix uniformly in clay loam, and it is more likely to destroy the physical and chemical properties of the soil. Therefore, the amount of gypsum used in clay loam is reduced to reduce its negative effects.
[0033] The application amount of slag and biochar provided by the present invention is relatively large, the slag price is cheap, and the biochar also has the effect of increasing production. Therefore, the application amount of both slag and biochar is preferably 2500 kg/hm 2, which is convenient for operation.
[0034] The present invention also relates to the application method of the combined reagent, including the following steps:
[0035] (1) During the transplanting-returning period of rice, transplant the rice into the rice field until the water depth is about 1 cm. The water depth of the field shall be maintained at about 2 cm within 5 to 7 days after transplanting to ensure that the seedlings return to green and survive;
[0036] (2) During the effective tillering period of rice, there is no visible water layer on the field surface, and keep the soil water content at 70%~80% of the saturated water content;
[0037] (3) In the invalid tillering period of rice, re-irrigate the field until the crack width reaches 1-2cm until the field depth is about 2cm;
[0038] In an embodiment of the present invention, for sandy loam soil, water is re-irrigated when the width of the cracks on the field surface reaches about 2 cm after drying in air. For clay loam, re-irrigate the field until the crack width of the field reaches about 1 cm.
[0039] (4) During the booting period of rice, mix the combination reagent with irrigation water evenly and apply it into the rice field. During the whole booting period, the water depth of the field is maintained at 1~3 cm by irrigation;
[0040] In one embodiment of the present invention, slag and biochar are added at an application rate of 2500 kg/hm 2 , crushed and mixed with desulfurized gypsum, and applied to the rice field through an integrated water and fertilizer device.
[0041] In an embodiment of the present invention, for sandy loam soil, the irrigation amount at the booting period is 800-1000 t/hm 2 . For clay loam, the irrigation amount at the booting period is 600-800 t/hm2 .
[0042] In an embodiment of the present invention, after mixing the combination reagent and irrigation water into the rice field, if the field surface water depth is less than 3 cm, then continue to irrigate until the water depth reaches about 3 cm, and the process does not continue to add the combination reagent.
[0043] (5) At the heading and maturity period of rice, after irrigating the rice field to a depth of 3~5cm, when the water is naturally dry and the soil water potential is -25kPa, then the rice field is irrigated. This irrigation method is alternate dry and wet irrigation, and no combination reagents are added during this process.
[0044] It should be noted that the traditional gypsum application method includes: before rice transplanting, the gypsum is evenly spread on the field, plowing, and then the land is leveled by irrigation. However, the turning-green tillering period is not the peak of methane emission, and the application of gypsum before transplanting affects the effect.
[0045] The invention employs an integrated water and fertilizer application method, the combined reagent containing desulfurized gypsum and water are uniformly stirred and then simultaneously applied to the soil, the combined reagent enters the soil together with the water, and the distribution in the soil is relatively uniform. And the rice booting period is the peak period of methane emission, and the application of gypsum at this period is more conducive to controlling methane emission.
[0046] Example 1
[0047] (1) Experiment selection materials and field design
[0048] The hybrid rice Yixiangyou 2115 was selected as the experimental variety, and its planting locations were in Chengdu and Mianyang. Sow on April 15, transplant on May 12, and harvest on September 8. Four rice fields with different soil physical and chemical properties were selected and grouped as experimental fields 1~4. Among them, test fields 1 and 2 are located at 30 43'N, 103° 47' E, and test fields 3 and 4 are located at 31° 32'N, 104° 41' E. The soil physical and chemical properties of the experimental fields are shown in Table 1. The above experimental fields 1 to 4 can represent the types of rice fields with different fertility and pH values.
[0049] Table 1
Experimentalfield Organic matter Total N Available N Available P Available K Soil types (g/kg) (g/kg) (mg/kg) (mg/kg) (mg/kg) SoilpH Experimental field 1 16.45 1.67 82.55 18.57 79.13 6.95 Sandy loam Experimental field 2 26.38 2.11 108.33 31.91 110.48 7.12 Sandy loam Experimental field 3 18.67 1.59 108.63 22.39 98.36 6.86 Sandy loam Experimental field 4 23.08 2.19 90.01 30.42 120.54 7.27 Sandy loam
[0050] (2) Field application
[0051] Divide each piece of farmland in the above-mentioned test fields 1 to 4 equally into 4 parts, and perform the following treatments respectively: a) No reagent is applied, and the control treatment of flooding irrigation is carried out; b) No reagent is applied, and the control treatment of alternating dry and wet irrigation is carried out ; c) Applying desulfurized gypsum for the control treatment of alternating dry and wet irrigation; d) Applying a combination reagent for the treatment of alternating dry and wet irrigation. The above-mentioned test field water management methods and specific application amounts of reagents are shown in Table 2, and other field management methods are the same.
[0052] Table 2
Experimental field Water management and reagent application
After the rice is transplanted, the field has always maintained a water layer Flooding irrigation with a depth of 1-3 cm, and dry naturally 1 week before harvest. (1) During the transplanting-returning period of rice, transplant the rice into the rice field until the water depth is about 1 cm. The water depth of the field shall be maintained at about 2 cm within 5 to 7 days after transplanting 1 to ensure that the seedlings return to green and survive; Alternating wet of rice, there is no visible water anddryirrigation(2) During the effective tillering period layer on the field surface, and the soil water content should be kept at 70%~80% of the saturated water content; (3) During the ineffective tillering period of rice, for sandy loam soil, re-irrigate when the field surface crack reaches about 2cm; for clay loam, re-irrigate when the field surface crack reaches about lcm. (4) During the booting period of rice, keep the field water depth at 1-3cm through irrigation; (5) At the heading and maturity period of rice, after irrigating the rice field to a depth of 3~5cm, when the water is naturally dried and the soil water potential is -25kPa, then irrigate the rice field is irrigated.
the only difference is that in the Altemate wet and Same as the above dry and wet irrigation, with dryirrigation+ booting period of rice, the desulfurized gypsum is mixed evenly 2 then applied to desulfurized irrigation water at an application rate of 1200 kg/hm , and the rice field through the integrated water and fertilizer equipment. The gypsum irrigation amount is 800 tg/ hm2
. Same as the above dry-wet alternate irrigation, the only difference is that in Alternate wet and the booting period of rice, the application rate of desulfurization gypsum is dry irrigation + 1200 kg/hm2, the application rate of slag is 2500 kg/hm 2 , and the application combination rate of biochar is 2500 kg/hm 2 .After the water is evenly mixed, it is applied reagent to the rice field through the integrated water and fertilizer equipment, and the irrigation volume is 800 tg/hm2 .
Flooding irrigation The same as Flooded irrigation in experiment field 1 Alternating wet The same as Alternate dry and wet irrigation in experiment field 1 and dry irrigation 2 Alternate wet and The same as the application method of dry and wet alternate irrigation
+ dry irrigation+ desulfurization gypsum in experimental field 1, the difference is that the desulfurized application rate of desulfurization gypsum is 900 kg/hm2 , and the irrigation gypsum rate is 700 tg/hm2 .
Alternate wet and The same as the dry-wet alternate irrigation + combined reagent application dry irrigation+ method in experimental field 1, the only difference is that the application combination rate of desulfurization gypsum is 900 kg/hm 2, the application rate of slag reagent and biochar are both 2500 kg/hm 2 , and the irrigation rate is 700 tg/ hm2 .
Flooding irrigation The same as Flooded irrigation in texperiment field 1 Alternating wet The same as Alternate dry and wet irrigation in t experiment field 1 and dry irrigation 3 Alternate wet and The same as the application method of dry-wet alternate irrigation +
dry irrigation+ desulfurization gypsum in experimental field 1, except that the application desulfurized rate of desulfurization gypsum is 1300 kg/hm2 and the irrigation rate is 900 gypsum tg/hm2
. Alternate wet and The same as the dry-wet alternate irrigation + combined reagent application dry irrigation+ method in experimental field 1, the only difference is that the application combination rate of desulfurized gypsum is 1300 kg/hm 2, the application rate of slag and reagent biochar are both 2500 kg/hm 2 , and the irrigation rate is 900 tg/ hm2
. Flooding irrigation The same as Flooded irrigation in t experiment field 1 Alternate wet and
dry irrigation +
y iion The same as Alternate dry and wet irrigation in experiment field 1 combination 4 reagent Alternate wet and The same as the application method of dry and wet alternate irrigation
+ dry irrigation+ desulfurization gypsum in experimental field 1, the difference is that the desulfurized application rate of desulfurization gypsum is 1000 kg/hm2 , and the irrigation gypsum rate is 800 tg/hm2 .
Alternate wet and The same as the dry-wet alternate irrigation + combined reagent application dry irrigation+ method in experimental field 1, the only difference is that the application combination rate of desulfurized gypsum is 1000 kg/hm2 , the application rate of slag and reagent biochar are both 2500 kg/hm 2 , and the irrigation rate is 800 tg/ hm2
[0053] Explanation: Take the experiment field 1 as an example, divide it into 4 evenly, the first plot is without reagents, as the control treatment for flooding irrigation; the second plot is without reagents applied, as the control treatment for alternating dry and wet irrigation; the third plot is only applied desulfurization gypsum at the booting period of rice, and the application rate 2 was 1200 kg/hm2, as a control treatment for alternate dry and wet irrigation; the fourth piece applied combination reagents at the booting period of rice, and the application amount of desulfurization gypsum was 1200 kg/hm 2, the application rate of slag is 2500 kg/hm2 , and the application rate of biochar is 2500 kg/hm 2, and the treatment of alternating dry and wet irrigation. That is, the experimental field 1 includes 4 treatment groups, and each treatment group corresponds to a method of water management and reagent application.
[0054] (3) Result analysis
[0055] The CH 4 gas sample is collected and detected by static dark box-gas chromatography. The sampling box size is 50 cmx50 cmx120 cm, and the base size is 50 cmx50 cmx20 cm. In order to prevent excessive temperature changes in the box during the sampling period, the surrounding area of the sampling box is covered with a foam board and sealed with tape. In order to fully mix the gas in the box and record the temperature changes in the box during sampling, a small 12 V fan and temperature sensor are installed inside. Insert the base of the sampling box in each treatment group before transplanting rice, and the base is flush with the surface of the soil layer. After the rice seedlings are transplanted, strike root and set up seedlings, choose sunny weather for sampling from 9:00 to 11:00, take a gas sample every 7 days, and take gas from the second day after transplanting to the end of the mature period.
[0056] When taking a sample, pour water into the groove of the base to seal the connection between the soil and the sampling box, then buckle the sampling box, and use a 50 mL syringe connected with a three-way valve to connect to the gas box in time, sampling 4 times continuously, the sampling interval is 10 minutes, the sampling volume is 45 mL, and the temperature inside the box is recorded. An Agilent 7890A gas chromatograph was used to analyze the gas samples, and CH4 was detected with an FID detector. The detection temperature was 180°C, the column temperature was 70°C, and the carrier gas flow rate was 40mL-min
. The standard gas was provided by the National Standards Center.
[0057] The formula for calculating greenhouse gas emission flux from rice fields is as follows: F=px273/(273+T)xHxdC/dt, where: F is the emission flux (mg-m-2•h-1); p is CH 4 density under standard atmospheric pressure (0.714 kg-m-3); 273 is the gas equation constant; T is the average temperature in the sampling box during the sampling process (C); H is the net height of the box cover of the sampling box (m); dC/dt is the rate of change of the greenhouse gas concentration in the sampling box. The amount of CH 4 emissions is the total mass of CH 4 emissions per hm 2 of rice throughout the field growth period (kg); the intensity of CH4 emissions is the mass of CH 4 emitted from the production of 1 kg of brown rice.
[0058] During the rice maturity period, each treatment group in each test field was delineated in a square area of1Omx1Om. The rice plants in the area were harvested manually, and the ears were manually threshed to obtain brown rice. The rice was obtained with a Japanese Kett Grain Moisture Analyzer (Kett PM-8188, Japan). After measuring the moisture content of brown rice, the yield is calculated according to the 13.5% standard moisture content.
[0059] Calculate the brown rice output of the above-mentioned experimental fields, as well as the methane emission and emission intensity during the whole growth period of rice, and take the average value for analysis. The specific results are shown in Table 3.
[0060] Table 3 Dry wet Drwealrnt Flood Alternate dry alternate Drywetalternate Experiment irrigation and wet irrigation + irrigation+ treatment irrigation desulfurization combined gypsum reagent 9567 9728 9804 1 Yield kg hm-2 8328 CH 4 emissions 54.22 45.32 31.27 26.31 kg hm-2 CH 4 emission intensity g CH 4 6.51 4.74 3.21 2.68 kg grain Yield kg hm-2 8620 8801 9100 9155 CH 4 emissions 39.32 30.34 21.38 2 kgChm 2 48.33 CH 4 emission intensity g CH 4 5.61 4.47 3.33 2.34 kg grain Yield kg hm-2 8403 8640 8698 8688
42.19 35.25 sons 59.43 50.34 3 CH4 CH 4 emission intensity g CH 4 7.07 5.83 4.85 4.06 kg grain Yield kg hm-2 8652 8952 9102 9245 CH4 emissions 40.10 30.46 sion 60.22 48.17 4 CH CH 4 emission intensity g CH 4 6.96 5.38 4.41 3.29 kg grain
[0061] It can be seen from Table 2 that taking experimental field 1 as an example, in which no reagent was used as the control group for flooding irrigation, the brown rice yield was 8328kg/hm 2, the CH 4 emission was 54.22kg/hm 2, and the CH 4 emission intensity was 6.51g CH 4 kg grain;
[0062] In the control group that was irrigated with alternate dry and wet without reagents, the brown rice yield was 9567kg/hm 2 , the CH 4 emission was 45.32kg/hm 2 , and the CH 4 emission intensity was 4.74g CH 4 kg grain;
[0063] In the control group that only applied desulfurized gypsum at the rice booting period and irrigated alternately between dry and wet, the brown rice yield was 9728kg/hm2 , the CH 4 emission was 31.27kg/hm 2, and the CH 4 emission intensity was 3.21g CH 4 kg grain;
[0064] In the treatment group that applied the combination reagent at the rice booting period and performed alternate dry and wet irrigation, the brown rice yield was 9804 kg/hm2 , the CH 4 emission was 26.31 kg/hm 2 , and the CH 4 emission intensity was 2.68 CH4 kg grain.
[0065] It can be seen from comparison that the control group that does not apply reagents for flooding irrigation has the highest CH 4 emissions. The control group that did not use the reagent for alternating wet and dry irrigation followed by, the control group that added a single desulfurized gypsum had a further decrease in CH 4 emissions, and the alternating wet and dry irrigation treatment group added a combined reagent had the lowest CH 4 emissions. At the same time, the brown rice yield of the flooded irrigation control group was the lowest, followed by the dry and wet alternate irrigation control group, and the brown rice yield of the dry and wet alternate irrigation treatment group with the combined reagent was the highest. It shows that adding a combination reagent containing desulfurized gypsum through water and fertilizer integrated mode during booting period irrigation can effectively reduce CH 4 emissions and emission intensity from rice fields without reducing yield, which is an effective measure to increase yield and reduce CH4 emissions.
[0066] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any variations and modifications can be easily made by those person skilled in the art should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention is as defined in the claims.
Claims (5)
1. A combined reagent for reducing methane emissions from rice fields, characterized in that, comprising desulfurized gypsum, slag, and biochar.
2. The combination reagent for reducing methane emissions from rice fields according to claim 1, characterized in that, the application amount of desulfurized gypsum in the combination reagent is 500~2000 kg/hm 2 , and the application amount of slag is 1500~3000 kg/hm 2, the application rate of biochar is 1500~3000 kg/hm2
. 3. The combination reagent for reducing methane emissions from rice fields according to claim 1, characterized in that, for sandy loam soil, the application amount of desulfurized gypsum in the combination reagent is 1200~1500 kg/hm2
. 4. The combined reagent for reducing methane emissions from rice fields according to claim 1, characterized in that, for clay loam, the application amount of desulfurized gypsum in the combined reagent is 800-1000 kg/hm2 .
5. The combined reagent for reducing methane emissions from rice fields according to claim 3 or 4, characterized in that, the application rates of slag and biochar are both 2500 kg/hm 2 .
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114080960A (en) * | 2021-11-30 | 2022-02-25 | 钟少晖 | Microbial powder for methane emission reduction, additional fertilizer and rice field methane emission reduction method |
| CN114731793A (en) * | 2022-04-07 | 2022-07-12 | 中山大学 | Method for reducing methane emission of rice field soil |
| CN115843635A (en) * | 2022-11-30 | 2023-03-28 | 中国农业科学院农业资源与农业区划研究所 | Paddy field irrigation and drainage unit non-point source pollution and methane cooperative emission reduction method based on field and ditch linkage |
| CN116584328A (en) * | 2023-07-17 | 2023-08-15 | 中国农业科学院农业资源与农业区划研究所 | Application and method of ethylene in reducing carbon footprint in rice production |
| WO2024121139A1 (en) | 2022-12-05 | 2024-06-13 | Basf Se | Reducing methane emissions of a flooded field |
-
2020
- 2020-11-11 AU AU2020103380A patent/AU2020103380A4/en not_active Ceased
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114080960A (en) * | 2021-11-30 | 2022-02-25 | 钟少晖 | Microbial powder for methane emission reduction, additional fertilizer and rice field methane emission reduction method |
| CN114731793A (en) * | 2022-04-07 | 2022-07-12 | 中山大学 | Method for reducing methane emission of rice field soil |
| CN115843635A (en) * | 2022-11-30 | 2023-03-28 | 中国农业科学院农业资源与农业区划研究所 | Paddy field irrigation and drainage unit non-point source pollution and methane cooperative emission reduction method based on field and ditch linkage |
| CN115843635B (en) * | 2022-11-30 | 2023-06-16 | 中国农业科学院农业资源与农业区划研究所 | Rice field irrigation and drainage unit non-point source pollution and methane synergistic emission reduction method |
| WO2024121139A1 (en) | 2022-12-05 | 2024-06-13 | Basf Se | Reducing methane emissions of a flooded field |
| CN116584328A (en) * | 2023-07-17 | 2023-08-15 | 中国农业科学院农业资源与农业区划研究所 | Application and method of ethylene in reducing carbon footprint in rice production |
| CN116584328B (en) * | 2023-07-17 | 2024-01-30 | 中国农业科学院农业资源与农业区划研究所 | Application and method of ethylene in reducing carbon footprint in rice production |
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