CN110632065A - Method for calculating application amount of slaked lime material for improving acid soil - Google Patents
Method for calculating application amount of slaked lime material for improving acid soil Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 122
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 title claims abstract description 66
- 239000000920 calcium hydroxide Substances 0.000 title claims abstract description 66
- 235000011116 calcium hydroxide Nutrition 0.000 title claims abstract description 66
- 229910001861 calcium hydroxide Inorganic materials 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000002253 acid Substances 0.000 title claims abstract description 37
- 239000000463 material Substances 0.000 title claims abstract description 33
- 238000004364 calculation method Methods 0.000 claims abstract description 11
- 239000005416 organic matter Substances 0.000 claims abstract description 10
- 150000007513 acids Chemical class 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 26
- 239000002245 particle Substances 0.000 claims description 26
- 239000012086 standard solution Substances 0.000 claims description 15
- 239000000523 sample Substances 0.000 claims description 13
- 238000005303 weighing Methods 0.000 claims description 10
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 8
- 239000011790 ferrous sulphate Substances 0.000 claims description 8
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 8
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 8
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 claims description 8
- 238000004448 titration Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- -1 hydrogen ions Chemical class 0.000 claims description 4
- 238000002386 leaching Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000008231 carbon dioxide-free water Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000004016 soil organic matter Substances 0.000 claims description 3
- 238000003892 spreading Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- QLOKJRIVRGCVIM-UHFFFAOYSA-N 1-[(4-methylsulfanylphenyl)methyl]piperazine Chemical compound C1=CC(SC)=CC=C1CN1CCNCC1 QLOKJRIVRGCVIM-UHFFFAOYSA-N 0.000 claims description 2
- 238000003926 complexometric titration Methods 0.000 claims description 2
- PTKRHFQQMJPPJN-UHFFFAOYSA-N dipotassium;oxido-(oxido(dioxo)chromio)oxy-dioxochromium;sulfuric acid Chemical compound [K+].[K+].OS(O)(=O)=O.[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O PTKRHFQQMJPPJN-UHFFFAOYSA-N 0.000 claims description 2
- 239000012153 distilled water Substances 0.000 claims description 2
- 239000000706 filtrate Substances 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 229910052739 hydrogen Inorganic materials 0.000 claims description 2
- 239000001257 hydrogen Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 239000012488 sample solution Substances 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 239000002681 soil colloid Substances 0.000 claims description 2
- 239000010902 straw Substances 0.000 claims description 2
- 239000012490 blank solution Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000002474 experimental method Methods 0.000 description 7
- 239000000126 substance Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 150000003839 salts Chemical group 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000005341 cation exchange Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 238000012821 model calculation Methods 0.000 description 2
- 239000002574 poison Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000012272 crop production Methods 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009666 routine test Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention relates to a method for calculating the application amount of a slaked lime material for improving acid soil. The calculation method comprises the following steps: adding hydrated lime to the acid soil to be improved to achieve a predetermined target pH, wherein the amount of hydrated lime applied is calculated according to the following formula: (pH)t‑pHi)×0.583/[(0.27+0.073×(6.29‑pHi)‑0.00096×CL‑0.0022×OM‑0.011×[H]ex)×EC]。pHiWith pHtRespectively representing the initial pH value and the preset target pH value of the acidified soil; CL represents acidified soil cosmids; OM represents the organic matter content of the acidified soil; [ H ]]exRepresents acidified soil-exchangeable acids; EC represents the presence of CaO in the slaked lime materialEffective content. The method can simply, conveniently, accurately and quickly provide the application amount of the slaked lime material suitable for various acidified soil properties in China, thereby effectively realizing the quick and accurate adjustment of the pH value of the acidified soil.
Description
Technical Field
The invention relates to a method for calculating the application amount of a slaked lime material for improving acid soil.
Background
The acid soil in China is distributed in 14 provinces, and the total area reaches 2.03 multiplied by 108 hm2And occupies about 21 percent of the cultivated land area in China. The growth of crops has certain requirements on the acidity and alkalinity of soil, most crops grow in neutral or weakly acidic or weakly alkaline soil, the growth of the crops is not facilitated when the pH value of the soil is too high or too low, and the crops can not even grow under the severe acidic condition that the pH value is less than 4.0. In addition, the acidification activates the aluminum in the soil solid phase and releases the aluminum into the soil solution to poison the root system of crops, influence the growth of the crops, change the physical, chemical and biological properties of the whole soil, activate heavy metal elements in the soil and increase the absorption of harmful heavy metals by the plants. Hydrated lime material is a widely used material for adjusting the pH of acidified soil. By applying the hydrated lime material, the acidity of the soil can be effectively reduced, the poison of aluminum and other heavy metals is relieved, calcium nutrient elements are supplemented, the soil structure is improved, and the crop production is increased.
However, there has been a lack of an effective method for determining the application amount of a slaked lime material for improving acid soil. The types of soil in different regions are very different, different hydrated lime materials are different, and the application amount of the hydrated lime materials for improving acid soil is closely related to the soil property. Currently, methods for determining the application amount of slaked lime for improving acid soil mainly include a soil pH method, a titration method, a buffer solution, exchangeable aluminum, and the like. Soil pH is one of the earliest methods for determining the required amount of slaked lime, which considers that when the soil pH is 7, the degree of saturation of the salt group is 100%, when the soil pH is 4, the degree of saturation of the salt group is 0, and when the soil pH is between 4.0 and 7.0, the soil pH and the degree of saturation of the salt group are in a linear relationship, the degree of saturation of the salt group of the soil is estimated by measuring the soil pH, and on the other hand, the soil cation exchange amount is estimated by the soil texture and the organic matter content, which has the disadvantage that the slaked lime application amount is higher or lower by the error in estimating the soil cation exchange amount, while the titration method is based on KOH or Ca (OH)2The method is accurate in titration of acid in soil, but time-consuming, and is not beneficial to measurement of a large number of samples and large-scale field implementation. In addition, at presentThere are large differences in the effectiveness of the slaked lime material, which also affects to some extent the accuracy of the slaked lime material in the conditioning of the acidified soil.
Disclosure of Invention
In order to solve the difficulties, the invention provides a method for calculating the application amount of a slaked lime material for improving acid soil. The method can simply, conveniently, accurately and quickly provide the application amount of the hydrated lime material suitable for various acidified soil properties in China.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for calculating the application amount of a slaked lime material for improving acid soil comprises the following steps: adding a hydrated lime material to the acidic soil to be remediated to achieve a predetermined target pH, said hydrated lime application amount being calculated according to the following formula:
(pHt-pHi)×0.583 / [(0.27+0.073×(6.29-pHi)-0.00096×CL-0.0022×OM-0.011×[H]ex)×EC]
wherein the pH isiWith pHtRespectively representing the initial pH value and the preset target pH value of the acidified soil;
CL represents acidified soil cosmid (< 0.002 mm) (%);
OM represents the organic matter content of the acidified soil, namely the amount of organic matter contained in each kilogram of air-dried soil, and the unit is g/kg;
[H]exthe total amount of exchangeable hydrogen ions and aluminum ions adsorbed on the surface of soil colloid belongs to potential acid, and the unit is cmol/kg;
EC represents the effective CaO content (%) in the slaked lime;
the amount of slaked lime applied is in tons per hectare.
The physical and chemical properties of the soil are mainly subjected to routine test analysis on the soil by referring to 'soil agriculture chemical analysis' (Boston 2000). Wherein the pH of the soiltThe value is a target pH value and is directly set according to the value required to be adjusted; for the pH of the soiliThe method for determining the value comprises the following steps: 5g of soil was weighed into a centrifuge tube and 25m was addedL carbon dioxide-free water, setting soil/water mass ratio =1:5, stirring for 2min and standing for 30min, and measuring the supernatant with a pH meter.
The acidified soil clay particles (CL) are measured by a straw method, and the method comprises the following steps: weighing 1 part of 10g air-dried soil sample which passes through a sieve pore of 2mm in a triangular flask, adding 10mL of 0.5mol/L sodium hydroxide solution, adding distilled water, fully shaking, boiling on an electric hot plate, and keeping for 1 hour to fully disperse the sample. Classifying according to the viscosity particle of less than 0.002mm, measuring the particles with the size fraction of more than 0.25mm by a screening method, and measuring the particles with the size of less than 0.25mm by a still water sedimentation method. And (3) screening the sand grains with the grain size of more than 0.25mm through a soil screen with the grain size of 1mm and a soil screen with the grain size of 0.5mm, and drying the classified sand grains respectively and then weighing the sand grains. The measurement of particles with a particle size of less than 0.002mm is carried out by standing for a certain period of time (the specific time is described in soil agriculture chemical analysis (Boston 2000)), vertically inserting a pipette from the center of the suspension to a position 100 + -1 mm below the liquid surface, completing within 10s, sucking the suspension, drying and weighing. The percentage of particles smaller than a certain particle size is calculated as follows:
x%=[(g1/g)*(100/v)]*100%
wherein x% is the percentage of the particle with a certain diameter; g1The weight (g) of particles with a certain particle size in the liquid absorption; g is the oven dry weight (grams) of the sample analyzed; v is pipette volume (mL).
The organic matter content (OM) of the acidified soil is measured by an additional thermogravimetric potassium chromate volumetric method: under heating, using excessive potassium dichromate-sulfuric acid (K)2Cr2O7－H2SO4) Solution for oxidizing carbon and Cr in soil organic matter2O7 -2Etc. are reduced to Cr+3The remaining potassium dichromate (K)2Cr2O7) Titrating with ferrous sulfate standard solution, calculating the organic carbon amount according to the consumed potassium dichromate amount, and multiplying by a constant 1.724 to obtain the organic matter content of the acidified soil. Calculating the formula:
acidified soil organic matter content = [ ((V)0-V) C0.003X 1.724X 1.1)/sample weight]×1000
In the formula: v0Is when titrating blank liquidThe number of milliliters of ferrous sulfate standard solution is used; v is the milliliter number of ferrous sulfate standard solution used when titrating the sample solution; c is the concentration (mol/L) of the ferrous sulfate standard solution.
Acidified soil exchangeable acids [ H ]]exMeasured according to a KCl leaching method: weighing 5.00 g of air-dried soil sample passing through a 1mm sieve in a funnel paved with filter paper, and leaching and fixing the volume by 1 mol/L KCl for a small amount of times. Sucking the filtrate and boiling for 5 min to remove CO2A phenolphthalein indicator was added and titrated to reddish with NaOH standard solution while performing a blank test. The calculation formula of the acidified soil exchangeable acid is as follows:
acidified soil exchangeable acids [ H ]]ex= 1000*c*(V1-V0)/(m*10)
In the formula, V1NaOH standard solution consumption (mL) in sample titration; v0NaOH standard solution consumption (mL) for blank titration; c is the concentration (mol/L) of the NaOH standard solution; and m is the dry weight (g) of the soil.
The method for measuring the effective content of CaO in the hydrated lime refers to a method of complexometric titration in the national standard (GB/T3286.1).
The method for improving the acid soil by using the hydrated lime comprises the following steps:
before ploughing, grinding slaked lime, uniformly spreading the ground slaked lime on the surface of the cultivated land soil, and ploughing so as to enable the pH value of the acidified soil to reach a target value; wherein the depth of the plowing is 20 cm.
In the above method, the target pH (i.e., pH) of the soil is determined according to the acid soil to be improved and the planting systemt) And according to the application amount obtained by the calculation method of the hydrated lime material, the method of uniformly spreading the agricultural calcareous material on the surface of the cultivated land soil before turning over and immediately turning over for 20cm is adopted.
The hydrated lime material applied in the calculation method of the present invention must be ground into a powder before it can be completely dispersed in the soil. The extent of slaked lime dispersion affects the rate of increase in soil pH. All are required to pass through a 20 mesh screen.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the method can simply, conveniently, accurately and quickly provide the application amount of the slaked lime material suitable for various acidified soil properties in China, thereby effectively realizing the quick and accurate adjustment of the pH value of the acidified soil.
Drawings
FIG. 1. comparison of the calculated amount of slaked lime with the actual amount of the experiment (target pH: pH 7.0);
FIG. 2. slaked lime application rates determined by the calculation method of the present invention versus field application rates in the literature.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
Example 1:
aiming at the method for calculating the application amount of the slaked lime, the soil with different properties in Guizhou, Hunan and Jiangxi is randomly selected, and the basic physicochemical properties of the soil are shown in Table 1. The target pH (i.e., pH) was set by substituting the parameters of Table 1 into the equation for the amount of hydrated lime (EC = 58.3%; granules can pass 20 mesh) applied andt) At 7.0, the recommended application rates (i.e., model calculations) for different soils were obtained: 7.12 tons/hectare (Guizhou 1), 7.82 tons/hectare (Guizhou 2), 8.92 tons/hectare (Jiangxi 1), 4.5 tons/hectare (Jiangxi 2), 8.31 tons/hectare (Hunan Qiyang).
Utilizing the above set target pH (i.e., pH)t) Culture experiments were performed, selecting the application rate with a final actual pH of 7.0 as the actual amount of slaked lime obtained in the experiments. The soil culture test method and the steps are as follows: adding a corresponding amount of slaked lime (EC = 58.3%; particles can pass through 20 meshes) respectively for soil culture, keeping the temperature at 25 ℃ and the water holding capacity at 70% (soil moisture is kept by a weighing method in the experiment), repeating each treatment for 3 times, after culturing for 2 months, weighing 5g of soil in a centrifuge tube, adding 25mL of carbon dioxide-free water, setting the soil/water mass ratio =1:5, stirring for 2min, standing for 30min, and measuring the supernatant by using a pH meter. According to experiments, the practical application amount of the obtained hydrated lime is respectively as follows: 6.53 tons/hectare (Guizhou 1), 8.1 tons/hectare (Guizhou 2), 8.70 tons/hectareHectares (Jiangxi 1), 4.76 tons/hectare (Jiangxi 2), 8.67 tons/hectare (Hunan Qiyang).
TABLE 1 basic physicochemical Properties of five acid soils used in the slaked lime application amount experiments
Taking a target pH value of pH 7 as an example, comparing the practical using amount of the slaked lime obtained by the experiment with the theoretical slaked lime adding amount obtained by model calculation; as shown in figure 1, the consistency between the two is good, and the calculation method of the application amount of the hydrated lime can accurately calculate the application amount of the hydrated lime required by different acid soils to achieve the target pH value adjustment.
Example 2:
in order to further illustrate that the calculation method for the application amount of the slaked limestone has the advantage of universality, the method collects the literature data of field tests for improving the acid soil by the calcareous substances in the areas of Yunnan, Zhejiang, Hubei, Jiangxi, Hunan, Guangxi, Anhui, Fujian, Guangdong, Shandong and the like. Data of a test containing the initial pH of the soil, the pH of the soil after the application (set to the target pH) and the application amount of the limestone material corresponding thereto were screened (as shown in table 2). Using the original pH of the acid soil as the initial pH value (i.e. pH value) of the soili) The actual pH after the modification is taken as the target pH (i.e., pH)t) The amount of the hydrated lime material to be applied is calculated by the calculation method of the present invention and compared with the amount applied in the literature, and the result is shown in fig. 2. The comparison result shows that the application amount of the hydrated lime material determined by the calculation method is similar to the actual usage amount of the hydrated lime material in the field, so that the calculation method can accurately predict the actual application amount of the hydrated lime material in the field.
TABLE 2 investigation of the amount of hydrated lime applied to the field to improve acid soil
Note: the relevant documents and data referred to in Table 2 can be directly searched and inquired from the national knowledge network according to the article title
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. A method for calculating the application amount of a slaked lime material for improving acid soil is characterized by comprising the following steps: adding hydrated lime to the acid soil to be improved to achieve a predetermined target pH, said amount of hydrated lime applied being calculated according to the following formula:
(pHt-pHi)×0.583 / [(0.27+0.073×(6.29-pHi)-0.00096×CL-0.0022×OM-0.011×[H]ex)×EC]
wherein the pH isiWith pHtRespectively representing the initial pH value and the preset target pH value of the acidified soil;
CL represents the percentage of acidified soil clay, i.e. particles with a particle size of less than 0.002 mm;
OM represents the organic matter content of the acidified soil, namely the amount of organic matter contained in each kilogram of air-dried soil, and the unit is g/kg;
[H]exthe total amount of exchangeable hydrogen ions and aluminum ions adsorbed on the surface of soil colloid belongs to potential acid, and the unit is cmol/kg;
EC represents the effective content of CaO in the slaked lime, expressed as a percentage;
the unit of the application amount of the hydrated lime is as follows: ton/hectare.
2. The method for calculating the application amount of slaked lime material for improving acid soil of claim 1, wherein the pH of the soil is determined by the pH of the soiltThe value is a target pH value and is directly set according to the value required to be adjusted; for the pH of the soiliThe method for determining the value comprises the following steps: 5g of soil was weighedSoil in a centrifuge tube, 25mL of carbon dioxide-free water is added, the mass ratio of soil to water is set to be =1:5, the mixture is stirred for 2min and is kept stand for 30min, and a supernatant is measured by a pH meter.
3. The method for calculating the application amount of the slaked lime material for improving acid soil according to claim 1, wherein the acidified soil clay particles are measured by a straw method, and the method comprises the following steps: weighing 1 part of 10g of air-dried soil sample which passes through a sieve pore of 2mm in a triangular flask, adding 10mL of 0.5mol/L sodium hydroxide solution, adding distilled water, fully shaking up, boiling on an electric hot plate, and keeping for 1 hour to fully disperse the sample; classifying according to that the clay particles are less than 0.002mm, measuring the particles with the size fraction larger than 0.25mm by a screening method, and measuring the particles with the size smaller than 0.25mm by a still water sedimentation method; respectively drying the sand grains with the size of more than 0.25mm by a soil sieve with the size of 1mm and 0.5mm, and weighing the classified sand grains; measuring particles with the particle size of less than 0.002mm, standing for a certain time, vertically inserting a pipette from the center of the suspension to a position 100 +/-1 mm below the liquid level, completing the measurement within 10 seconds, sucking the suspension, drying and weighing; the percentage of particles smaller than a certain particle size is calculated as follows:
x%=[(g1/g)*(100/v)]*100%
wherein x% is the percentage of the particle with a certain diameter; g1The weight of particles with a particle size smaller than a certain particle size in liquid absorption is as follows: g; g is the oven dry weight of the sample analyzed, unit: g; v is pipette volume, unit: and (mL).
4. The method for calculating the application amount of the slaked lime material for improving acid soil according to claim 1, wherein the organic matter content of the acidified soil is measured by an applied heat potassium chromate volumetric method: under the condition of heating, excess potassium dichromate-sulfuric acid solution is used to oxidize carbon and Cr in soil organic matter2O7 -2Is reduced into Cr+3Titrating the residual potassium dichromate by using a ferrous sulfate standard solution, calculating the amount of organic carbon according to the amount of the consumed potassium dichromate, and multiplying the calculated amount by a constant 1.724 to obtain the organic matter content of the acidified soil; calculating the formula:
acidified soilOrganic content = [ ((V)0-V) C0.003X 1.724X 1.1)/sample weight]×1000
In the formula: v0The standard ferrous sulfate solution is used for titration of the blank solution in milliliters; v is the milliliter number of ferrous sulfate standard solution used when titrating the sample solution; c is the concentration of the ferrous sulfate standard solution, and the unit is mol/L.
5. The method for calculating the application amount of the slaked lime material for improving acid soil according to claim 1, wherein the acidified soil-exchange acid is measured by a KCl leaching method: weighing 5.00 g of air-dried soil sample which passes through a 1mm sieve, placing the air-dried soil sample into a funnel with laid filter paper, and leaching and fixing the volume by using 1 mol/L KCl for a small amount of times; sucking the filtrate and boiling for 5 min to remove CO2Adding phenolphthalein indicator, titrating to reddish with NaOH standard solution, and simultaneously carrying out blank test; the calculation formula of the acidified soil exchangeable acid is as follows:
acidified soil exchangeable acids [ H ]]ex= 1000*c*(V1-V0)/(m*10)
In the formula, V1NaOH standard solution consumption in sample titration, unit: mL; v0NaOH standard solution consumption in blank titration, unit: mL; c is the concentration of the NaOH standard solution, unit: mol/L; m is the dry weight of the soil, unit: g.
6. the method for calculating the application amount of the slaked lime material for improving acid soil according to claim 1, wherein the effective content of CaO in the slaked lime is measured by a method of complexometric titration in the national standard GB/T3286.1.
7. The method for calculating the application amount of the slaked lime material for improving acid soil according to claim 1, wherein the step of improving the acid soil by using the slaked lime comprises the following steps:
before ploughing, grinding slaked lime, uniformly spreading the ground slaked lime on the surface of the cultivated land soil, and ploughing so as to enable the pH value of the acidified soil to reach a target value; wherein the depth of the plowing is 20 cm; and the slaked lime is ground and then sieved by a 20-mesh sieve.
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