An acidic soil additive and its use

Abstract

The application discloses an acidic soil additive and application thereof, and belongs to the technical field of soil improvement. The acidic soil additive comprises tartaric acid and calcium hydroxide. In addition, the application further discloses application of the acidic soil additive in planting rape. The additive can promote the growth of rape under the cooperation of tartaric acid and calcium hydroxide.

Description

Technical Field

[0001] This invention relates to the field of soil improvement technology, specifically to acidic soil additives and their applications. Background Technology

[0002] Approximately 50% of global arable land and potential arable land is acidic soil. In China, acidic soil accounts for about 21% of potential arable land, mainly distributed south of the middle and lower reaches of the Yangtze River. Soil environment is essential for plant growth; differences in soil environment directly affect plant growth and development, crop yield, and ultimately, human quality of life. The impact of acidic soil on plant growth mainly includes two aspects: First, excessive heavy metal content causes toxicity of aluminum, manganese, and iron. Although the solubility of trace elements such as iron, manganese, and zinc increases in acidic soil, excessive absorption of these elements can still be toxic to plants. Second, there is a deficiency of essential nutrients such as calcium, magnesium, nitrogen, and phosphorus. The high hydrogen ion concentration in acidic soil leads to a decrease in soil pH. Under this environment, the availability of nutrients such as phosphorus, calcium, and magnesium in the soil is significantly reduced. The phosphorus fixation rate increases as pH decreases, reducing the content of available phosphorus in the soil, thus affecting the absorption and utilization of phosphorus by plants. Furthermore, the loss of elements such as calcium and magnesium is also exacerbated, leading to corresponding deficiency symptoms in plants. Because of the increased activity of heavy metals such as aluminum and manganese in acidic soils, they can easily poison plant roots. These toxic elements damage the cellular structure of roots, affecting their normal physiological functions, such as reducing their ability to absorb water and nutrients, and even causing roots to turn black and rot. Poor root development further affects the plant's absorption and utilization of nutrients, leading to weak plant growth and reduced yield.

[0003] As a major oilseed crop in the middle and lower reaches of the Yangtze River, rapeseed (Brassica napus) accounts for one-third of the country's oil production. my country's acidic soils are mainly distributed in the middle and lower reaches of the Yangtze River, which highly overlaps with rapeseed planting areas. Therefore, it is essential to analyze the aluminum toxicity tolerance mechanism of rapeseed (Brassica napus), a major oilseed crop in the middle and lower reaches of the Yangtze River.

[0004] Therefore, how to promote the growth of rapeseed in acidic soil is a technical problem that existing technologies need to solve. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide an acidic soil additive and its application, thereby solving the technical problem of how to promote plant growth in acidic soil in the prior art.

[0006] To achieve the above-mentioned technical objectives, the present invention provides an acidic soil additive, comprising tartaric acid and calcium hydroxide.

[0007] In any embodiment, the mass ratio of tartaric acid to calcium hydroxide is (2-9):(1-8).

[0008] Furthermore, this invention also proposes an application of the above-mentioned acidic soil additive in rapeseed cultivation.

[0009] In any implementation, the above application includes the following steps:

[0010] Add inorganic fertilizer to the acidic soil, then water the acidic soil thoroughly, then sow rapeseed seeds on the acidic soil, cover with soil and film to retain moisture, remove the film after the rapeseed seeds germinate, then add the acidic soil additive to the acidic soil, and then water to ensure the rapeseed grows normally.

[0011] In any embodiment, the amount of the inorganic fertilizer added to the soil is: (NH4)2SO4 940-944 mg / kg, KH2PO4 287-290 mg / kg, KCl 159-162 mg / kg, MgSO4·7H2O 250-255 mg / kg, H3BO3 2.84-2.9 mg / kg, MnCl2·4H2O 1.81-1.85 mg / kg, Na2MoO4·2H2O 0.121-0.125 mg / kg, ZnSO4·7H2O 0.221-0.225 mg / kg, CuSO4·5H2O 0.08-0.1 mg / kg.

[0012] In any embodiment, the acidic soil has a pH of 5-5.1 and an ionic aluminum content of 425-427 mg / kg.

[0013] In any embodiment, the rapeseed is Huayou No. 4 Brassica napus.

[0014] In any implementation, the watering is carried out every 3-4 days to ensure the normal growth of the rapeseed.

[0015] In any embodiment, 2-3g of the acidic soil additive is added per kilogram of soil.

[0016] Compared with the prior art, the beneficial effects of the present invention include: the acid soil additive proposed in the present invention, which includes tartaric acid and calcium hydroxide, can significantly alleviate the toxicity of acid soil to rapeseed after rapeseed has been growing continuously for a period of time under the combined effect of tartaric acid and calcium hydroxide, thereby promoting the growth of rapeseed. Attached Figure Description

[0017] Figure 1 The growth results of rapeseed seedlings in Examples 1-3 and Comparative Example 1 of this invention are shown.

[0018] Figure 2 The results show the plant height of rapeseed during the flowering period in Examples 1-3 and Comparative Example 1 of this invention.

[0019] Figure 3 The soil pH results during the flowering period of rapeseed in Examples 1-3 and Comparative Example 1 of this invention are shown.

[0020] Figure 4 The results show the available phosphorus in the soil during the flowering period of rapeseed in Examples 1-3 and Comparative Example 1 of this invention.

[0021] Figure 5 The results of soil alkaline nitrogen hydrolysis during the flowering period of rapeseed in Examples 1-3 and Comparative Example 1 of this invention are shown.

[0022] Figure 6 The results show the available potassium in the soil during the flowering period of rapeseed in Examples 1-3 and Comparative Example 1 of this invention.

[0023] Figure 7 The results show the soil organic matter during the flowering period of rapeseed in Examples 1-3 and Comparative Example 1 of this invention.

[0024] Figure 8 The yield results of rapeseed at maturity in Examples 1-3 and Comparative Example 1 of this invention are shown.

[0025] Figure 9 The results show the thousand-grain weight of rapeseed at maturity in Examples 1-3 and Comparative Example 1 of this invention. Detailed Implementation

[0026] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60–120 and 80–110 are listed for a specific parameter, it is understood that ranges of 60–110 and 80–120 are also expected. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0027] Unless otherwise specified, the terms "comprising" and "including" as used in this application can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0028] Unless otherwise specified, the term "or" is inclusive in this application. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0029] This specific embodiment provides an acidic soil additive, comprising tartaric acid and calcium hydroxide; the mass ratio of the tartaric acid to the calcium hydroxide is (2-9):(1-8).

[0030] Tartaric acid, a key byproduct of sugar metabolism, is primarily produced through the breakdown of ascorbic acid (vitamin C). Its chemical name is 2,3-dihydroxysuccinic acid, an organic carboxylic acid with a specific chemical structure, the molecular formula C4H6O6, and a molecular weight of 150.09 g / mol. In the plant kingdom, tartaric acid is particularly prominent as a major organic acid component in grape berries, significantly influencing the flavor and texture of wine. The accumulation mechanism of tartaric acid exhibits high stability; its levels are generally not significantly affected by external environmental stresses (such as drought and salt stress), changes in ecological conditions, or cultivation management practices in agricultural production (such as irrigation and fertilization).

[0031] Calcium hydroxide is a strong alkali that can effectively neutralize acidic components in acidic soils, increase soil pH, improve the availability of trace elements in the soil, make it easier for crops to absorb nutrients, and promote crop growth and development.

[0032] This specific embodiment also proposes an application of the above-mentioned acidic soil additive in rapeseed cultivation, including: adding inorganic fertilizer to acidic soil, then watering the acidic soil thoroughly, then sowing rapeseed seeds on the acidic soil, covering with soil and film to retain moisture, removing the film after the rapeseed seeds germinate, then adding the acidic soil additive to the acidic soil, and then watering to ensure normal rapeseed growth; the dosage of the inorganic fertilizer added to the soil is: (NH4)2SO4 940-944mg / kg, KH2PO4 287-290mg / kg, KCl 159-162mg / kg, MgSO4·7H2O 250-255mg / kg, H3BO3 2.84-2.9mg / kg, MnCl2·4H2O 1.81-1.85mg / kg, Na2MoO4·2H2O 0.121-0.125 mg / kg, ZnSO4·7H2O 0.221-0.225 mg / kg, CuSO4·5H2O 0.08-0.1 mg / kg; the pH value of the acidic soil is 5-5.1, and the content of ionic aluminum is 425-427 mg / kg; the rapeseed is Huayou No. 4 Brassica napus type rapeseed; 2-3 g of the acidic soil additive is added per kilogram of soil.

[0033] In some embodiments, the rapeseed is normally watered once every 3-4 days for normal growth.

[0034] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0035] In this invention, the terms "some embodiments," "this embodiment," and examples are used to describe a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with each other without conflict.

[0036] If the application documents contain similar descriptions such as "first / second", the following explanation shall be added: In the following description, the terms "first / second / third" are used only to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first / second / third" may be interchanged in a specific order or sequence where permitted, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein.

[0037] In this embodiment, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0038] The following describes embodiments of this application. The embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments used, unless otherwise specified, are all conventional products that can be obtained commercially.

[0039] The acidic soil in the following examples has a pH of 5.1, an ionic aluminum content of 427 mg / kg, and the rapeseed planted is Huayou No. 4, a type of Brassica napus. The tartaric acid in the following examples has a mass percentage concentration of 99.5%, and the calcium hydroxide is analytical grade with a content greater than 95%. The acidic soil additive in the following examples is obtained by mixing tartaric acid and calcium hydroxide.

[0040] Example 1

[0041] This embodiment proposes an acidic soil additive 1, comprising tartaric acid and calcium hydroxide; the mass ratio of tartaric acid to calcium hydroxide is 2:8.

[0042] This embodiment also proposes the application of the above-mentioned acidic soil additive in rapeseed cultivation, including:

[0043] S1: The cultivation of rapeseed in pots was conducted at the potted plant farm of Huazhong Agricultural University. After air-drying and sieving, 7 kg of the test soil was weighed into each pot and placed in a Michaelis pot lined with black polyethylene film. Inorganic fertilizers were added to the well-mixed original soil at the following amounts: (NH4)2SO4 944 mg / kg, KH2PO4 287 mg / kg, KCl 159 mg / kg, MgSO4·7H2O 250 mg / kg, H3BO3 2.84 mg / kg, MnCl2·4H2O 1.81 mg / kg, Na2MoO4·2H2O 0.121 mg / kg, ZnSO4·7H2O 0.221 mg / kg, and CuSO4·5H2O 0.08 mg / kg. The potted soil was then thoroughly watered. Select 30 rapeseed seeds of uniform size, sow them evenly on the soil, cover them with soil and film to retain moisture, and remove the film after the seeds germinate.

[0044] S2: Add acidic soil additive to the well-mixed soil. The dosage of acidic soil additive 1 is 2g per kilogram of soil. Water the rapeseed every 3-4 days to ensure normal growth.

[0045] Example 2

[0046] This embodiment proposes an acidic soil additive 2, comprising tartaric acid and calcium hydroxide; the mass ratio of tartaric acid to calcium hydroxide is 8:2.

[0047] This embodiment also proposes the application of the above-mentioned acidic soil additive in rapeseed cultivation, including:

[0048] S1: The rapeseed cultivation in pots was conducted at the potted plant farm of Huazhong Agricultural University. After air-drying and sieving, 7 kg of the test soil was weighed into each pot and placed in a Michaelis pot lined with black polyethylene film. Inorganic fertilizers were added to the well-mixed original soil at the following amounts: (NH4)2SO4 942 mg / kg, KH2PO4 290 mg / kg, KCl 160 mg / kg, MgSO4·7H2O 253 mg / kg, H3BO3 2.88 mg / kg, MnCl2·4H2O 1.85 mg / kg, Na2MoO4·2H2O 0.123 mg / kg, ZnSO4·7H2O 0.225 mg / kg, and CuSO4·5H2O 0.1 mg / kg. The potted soil was then thoroughly watered. Select 30 rapeseed seeds of uniform size, sow them evenly on the soil, cover them with soil and film to retain moisture, and remove the film after the seeds germinate.

[0049] S2: Add acidic soil additive 2 to the well-mixed soil. The dosage of acidic soil additive 2 is 2.5g per kilogram of soil. Water the rapeseed every 3-4 days to ensure normal growth.

[0050] Example 3

[0051] This embodiment proposes an acidic soil additive 3, comprising tartaric acid and calcium hydroxide; the mass ratio of tartaric acid to calcium hydroxide is 9:1.

[0052] This embodiment also proposes the application of the above-mentioned acidic soil additive in rapeseed cultivation, including:

[0053] S1: The cultivation of rapeseed in pots was conducted at the potted plant farm of Huazhong Agricultural University. After air-drying and sieving, 7 kg of the test soil was weighed into each pot and placed in a Michaelis pot lined with black polyethylene film. Inorganic fertilizers were added to the well-mixed original soil at the following amounts: (NH4)2SO4 944 mg / kg, KH2PO4 288 mg / kg, KCl 162 mg / kg, MgSO4·7H2O 255 ​​mg / kg, H3BO3 2.9 mg / kg, MnCl2·4H2O 1.83 mg / kg, Na2MoO4·2H2O 0.125 mg / kg, ZnSO4·7H2O 0.222 mg / kg, and CuSO4·5H2O 0.09 mg / kg. The potted soil was then thoroughly watered. Select 30 rapeseed seeds of uniform size, sow them evenly on the soil, cover them with soil and film to retain moisture, and remove the film after the seeds germinate.

[0054] S2: Add acidic soil additive to the well-mixed soil. The dosage of acidic soil additive 3 is 3g per kilogram of soil. Water once every 3-4 days to ensure normal growth of rapeseed.

[0055] Comparative Example 1

[0056] This comparative example demonstrates the application of the aforementioned acidic soil additives in rapeseed cultivation, including:

[0057] S1: The cultivation of rapeseed in pots was conducted at the potted plant farm of Huazhong Agricultural University. After air-drying and sieving, 7 kg of the test soil was weighed into each pot and placed in a Michaelis pot lined with black polyethylene film. Inorganic fertilizers were added to the well-mixed original soil at the following amounts: (NH4)2SO4 944 mg / kg, KH2PO4 287 mg / kg, KCl 159 mg / kg, MgSO4·7H2O 250 mg / kg, H3BO3 2.84 mg / kg, MnCl2·4H2O 1.81 mg / kg, Na2MoO4·2H2O 0.121 mg / kg, ZnSO4·7H2O 0.221 mg / kg, and CuSO4·5H2O 0.08 mg / kg. The potted soil was then thoroughly watered. Select 30 rapeseed seeds of uniform size, sow them evenly on the soil, cover them with soil and film to retain moisture, and remove the film after the seeds germinate.

[0058] S2: Do not add acidic soil additives to the well-mixed soil, and water it every 3-4 days to ensure normal rapeseed growth.

[0059] The pH values ​​in the above embodiments and comparative examples were determined using the pH method, as follows:

[0060] Weigh 10.00 g of air-dried 20-mesh soil sample into a small beaker and add 25 mL of distilled water. Incubate at 28°C and 220 rpm for 30 minutes, then let stand for 30 minutes. Measure the pH using a pH meter. Add one reference sample for every 30 samples.

[0061] The above embodiments and comparative examples used the HNO3 method to determine the aluminum content in plants, as follows:

[0062] Representative rapeseed plants with relatively uniform growth were selected, blanched at 105℃ for 30 minutes, dried in an oven at 65℃, and weighed. 0.05g of the plant sample was weighed, digested using the HNO3 method, and measured using inductively coupled plasma optical emission spectrometry (ICP-OES) (Agilent Technologies 5110, USA).

[0063] The methods for determining available phosphorus in soil in the above embodiments and comparative examples were carried out as follows:

[0064] Weigh 5.00g of air-dried soil sample that has passed through a 20-mesh sieve. Place it in a 150mL plastic bottle, add 50mL of extraction solvent, and shake at 20-25℃ for 30min at a shaking frequency of 200 times / min. After shaking, filter the sample into the plastic bottle.

[0065] Pipette 10 mL of the filtrate into a 50 mL volumetric flask, add 10 mL of boric acid solution, then add 2 drops of dinitrophenol indicator. Adjust the pH to a slightly yellow color with dilute HCl and NaOH solutions, then add 5 mL of molybdenum antimony colorimetric reagent. Dilute to volume with water and shake well. Let stand at room temperature (20-25℃) for 30 min. Measure the color at 700 nm using a spectrophotometer. Simultaneously perform blank and reference sample determinations (blank is without soil sample, reference is a laboratory-prepared sample; other procedures are the same as for soil sample determination; add one blank and one reference sample for every 20-30 soil samples).

[0066] The methods for determining alkaline available nitrogen in soil in the above embodiments and comparative examples were carried out as follows:

[0067] Weigh 2.00g of air-dried soil sample (passed through a 20-mesh sieve) and place it in the outer chamber of a clean diffusion dish. Gently rotate the dish to spread the soil sample evenly. Add 2mL of boric acid-indicator mixed solution to the inner chamber of the diffusion dish. Then, coat the edge of the outer chamber with gum arabic, cover it with a frosted glass cover, and rotate it several times to ensure complete adhesion between the diffusion dish and the frosted glass. Next, turn the frosted glass aside and quickly add 10mL of 1mol / L NaOH solution to the outer chamber. Immediately seal the dish tightly and gently rotate it to cover all the soil with the alkali solution. Secure the frosted glass with a rubber band, then carefully place it flat in a 40±1℃ constant temperature incubator. After 24 hours of alkali hydrolysis and diffusion, remove the dish (the inner chamber will be blue). Titrate the NH3 in the absorbent solution in the inner chamber with 0.1mol / L or 0.01mol / L (1 / 2H2SO4) solution; the titration color changes from blue-green to purplish-red. Simultaneously, blank and reference samples were prepared. The blank sample was obtained without soil samples, while the reference sample was a laboratory-prepared sample. Other procedures were the same as for soil sample testing. One blank reference sample was added for every 20-30 soil samples.

[0068] The methods for determining available potassium in soil in the above embodiments and comparative examples were carried out as follows:

[0069] 1 mol / L neutral NH4OAc: Accurately weigh 77.09 g of chemically pure CH3COONH4, dilute with water, and bring the volume to 1 L.

[0070] K standard series solutions: Accurately weigh 0.1907 g of KCl (analytical grade, dried at 110℃ for 2 h) and dissolve it in 1 mol / L NH4OAc solution. Dilute to 1 L in a volumetric flask with 1 mol / L NH4OAc solution and store in a plastic bottle (100 μg / mL). Pipette 0, 2.5, 5, 10, 20, 40, and 60 mL of the above 100 μg / mL K standard solution into 100 mL volumetric flasks and dilute to volume with 1 mol / L NH4OAc solution to obtain the K standard series solutions with concentrations of 0, 2.5, 5, 10, 20, 40, and 60 μg / mL.

[0071] Accurately weigh 2.50 g of air-dried soil sample that has passed through a 0.84 mm (20 mesh) sieve into a 75 mL plastic bottle, add 25 mL of 1 mol / L neutral NH4OAc solution, cap, shake for 30 min, and filter with dry ordinary qualitative filter paper. Pour the filtrate into a 45 mL small plastic bottle and measure it together with potassium standard solution using a flame photometer.

[0072] The methods for determining organic matter in soil in the above embodiments and comparative examples were carried out as follows:

[0073] Weigh 0.1-1g (0.0001g) of air-dried soil sample that has passed through a 0.149mm (100-mesh) sieve and place it in a dry, hard test tube. Accurately add 5mL of 0.8000mol / L (1 / 6K2Cr2O7) standard solution using a pipette (if the soil contains chloride, add 0.1g of Ag2SO4 first). Add 5mL of concentrated H2SO4 using a syringe and shake well. Cover the tube with a small curved-neck funnel to condense and evaporate the water vapor. Place the test tube in a paraffin oil bath at 185-190℃. After placement, the temperature of the oil bath should drop to approximately 170-180℃. Maintain this temperature and start timing when the liquid in the test tube boils and bubbles appear. Boil for 5 minutes. Remove the test tube and allow it to cool. Pour the contents of the test tube into a 250mL Erlenmeyer flask. Rinse the inside of the test tube and the small funnel with water. The total volume of the solution in the Erlenmeyer flask should be 60-70mL. Maintain the concentration of (1 / 2H₂SO₄) in the mixture at 2-3mol / L. Then add 12-15 drops of 2-carboxylated diphenylamine indicator. At this point, the solution will turn brownish-red. Titrate with standard 0.2mol / L ferrous sulfate, continuously shaking the contents during the titration until the color of the solution changes from brownish-red through purple to dark green (grayish-blue-green). This is the titration endpoint. If using o-phenanthroline indicator, add 2-3 drops of the indicator. The endpoint is reached when the color of the solution changes from orange-yellow to blue-green to brick-red.

[0074] Depend on Figure 1 It can be seen that using additives in different proportions as treatment methods can significantly promote the growth of rapeseed in acidic soil. In addition, the exogenous addition of additives in different proportions also showed the effect of alleviating the toxic effects of aluminum stress on rapeseed, and effectively improving the growth phenotype of rapeseed.

[0075] Depend on Figure 2 It was found that under acidic soil conditions, the rapeseed plant height was approximately 46.3 cm without additives. After adding different proportions of exogenous additives to the soil, a significant increase in the aboveground dry weight of the rapeseed was observed. This change indicates that the addition of different proportions of exogenous additives has a mitigating effect on the stress experienced by rapeseed due to acidic soil. However, the mitigating effect of different concentrations of tartaric acid on rapeseed adaptation to acidic soil was inconsistent: comparatively, the mitigating effect of additive 2 was less than that of additive 3, indicating that the mitigating effect on acidic soil became stronger with increasing tartaric acid content, suggesting that tartaric acid plays a certain dose-response effect on rapeseed adaptation to acidic soil. The rapeseed plant height with additive 1 reached over 80 cm.

[0076] Depend on Figure 3It is known that the pH of acidic soil is approximately 5.9, while the pH of soils treated with different additives (such as exogenous addition of tartaric acid and calcium hydroxide in different proportions) reaches 6.2 or higher. This change not only improves the soil's acid-base balance but also helps reduce the content and activity of active aluminum in the soil. This indicates that under specific conditions, the buffering capacity of the soil system or other factors play an important role.

[0077] Depend on Figure 4 It is known that in acidic soils, changes in pH affect the availability of phosphorus, thus influencing the content of available phosphorus. By measuring the available phosphorus content in different treatments, we found that adding exogenous additives in varying proportions significantly reduced the available phosphorus content in the soil. The original available phosphorus content in acidic soil was approximately 3.1 mg / kg; after adding exogenous additives, the available phosphorus content dropped to only 1.7 and 0.8 mg / kg, a decrease of 80%, indicating that adding exogenous additives in varying proportions all reduced the available phosphorus content in the soil.

[0078] Depend on Figure 5 It is known that soil available nitrogen is an important form of soil nitrogen, reflecting the soil's recent nitrogen supply capacity, and mainly includes inorganic nitrogen and easily hydrolyzable organic nitrogen. When the exogenous additive ratio is tartaric acid:calcium hydroxide 9:1, the content of available nitrogen is significantly reduced, indicating that increasing the proportion of tartaric acid will change the soil's nitrogen supply capacity.

[0079] Depend on Figure 6 It is known that available potassium, as an essential nutrient element for crop physiological processes such as photosynthesis and respiration, plays a crucial role in crop growth and development. Appropriate amounts of available potassium can improve crop resistance to stress and disease, and even enhance crop quality. In this case, exogenous additive 1 reduced the available potassium content, while exogenous additives 2 and 3 significantly increased it. This indicates that different additive ratios have different mechanisms of action in influencing rapeseed's adaptation to acidic soil.

[0080] Depend on Figure 7 It is known that organic matter specifically refers to substances in the soil that originate from life, such as plant and animal remains, microorganisms, and applied organic fertilizers. These substances undergo complex biochemical processes to form stable humus, which is closely bound to the soil and becomes an important component of soil fertility. Changes in the proportion of exogenous additives do not affect the content of organic matter.

[0081] Depend on Figure 8 It can be seen that the yield of rapeseed varies greatly among different treatments. The yield in acidic soil is 2.69 g / plant. The addition of exogenous additives significantly increases the yield of rapeseed. The yield of rapeseed corresponding to additive 2 is as high as 5 g / plant, indicating that the addition of exogenous tartaric acid can significantly increase the adaptability of rapeseed to acidic soil.

[0082] Depend on Figure 9 It is evident that measuring the thousand-grain weight can aid in predicting crop yield in the field, and can be further used to assess the seed characteristics of different varieties or lines. Adding different proportions of exogenous additives can significantly increase the thousand-grain weight of rapeseed; additive 1 resulted in a thousand-grain weight of over 4g, which can serve as an important indicator for assessing the increased adaptability of rapeseed to acidic soils due to tartaric acid.

[0083] Overall, the results showed that the exogenous addition of tartaric acid and calcium hydroxide mixtures in different proportions significantly increased the adaptability of rapeseed to acidic soils. This invention explored how different additives can enhance the adaptability of rapeseed to acidic soils from the perspectives of rapeseed growth, plant height, soil pH, available phosphorus, available nitrogen, available potassium, organic matter, and yield at maturity.

[0084] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. Use of an acidic soil additive in the cultivation of oilseed rape, characterized in that, The acid soil additive comprises tartaric acid and calcium hydroxide, and the mass ratio of the tartaric acid to the calcium hydroxide is (2-9):(1-8).

2. Use according to claim 1, characterized in that, The method comprises the following steps: An inorganic fertilizer is added to the acid soil, then water is poured into the acid soil until the water is poured through, then rape seeds are sowed on the acid soil, and the soil is covered and watered; after the rape seeds germinate, the covering is removed, then the acid soil additive is added to the acid soil, and then water is poured to ensure the normal growth of the rape.

3. Use according to claim 2, characterized in that, The inorganic fertilizer added to the soil is used in an amount of (NH4)2SO4 940-944 mg / kg, KH2PO4 287-290 mg / kg, KCl 159-162 mg / kg, MgSO4·7H2O 250-255 mg / kg, H3BO3 2.84-2.9 mg / kg, MnCl2·4H2O 1.81-1.85 mg / kg, Na2MoO4·2H2O 0.121-0.125 mg / kg, ZnSO4·7H2O 0.221-0.225 mg / kg, and CuSO4·5H2O 0.08-0.1 mg / kg.

4. Use according to claim 2, characterized in that, The pH value of the acid soil is 5-5.1, and the content of ionic aluminum is 425-427 mg / kg.

5. Use according to claim 2, characterized in that, The rape seeds are Huayou No. 4 Brassica napus.

6. Use according to claim 2, characterized in that, The water pouring to ensure the normal growth of the rape is performed once every 3-4 days.

7. Use according to claim 2, characterized in that, The acid soil additive is added in an amount of 2-3 g per kg of soil.

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