Acid soil additive and application thereof

Abstract

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

Description

Technical Field

[0001] The invention relates to the technical field of soil improvement, and in particular to an acidic soil additive and application thereof. Background Art

[0002] About 50% of the world's arable land and potential arable land are acidic soils. In China, acidic soils account for about 21% of potential arable land, mainly distributed in the south of the middle and lower reaches of the Yangtze River. Soil environment is a necessary condition for plant growth. Differences in soil environment directly affect plant growth and development, crop yields, and ultimately affect people's quality of life. The impact of acidic soil on plant growth mainly includes two aspects. On the one hand, excessive content of heavy metal elements causes poisoning of aluminum, manganese and iron. In acidic soil, although the solubility of trace elements such as iron, manganese and zinc increases, excessive absorption of these elements may also cause toxicity to plants; on the other hand, the lack of essential nutrients, such as calcium, magnesium, nitrogen and phosphorus. The high concentration of hydrogen ions in acidic soil leads to a decrease in soil pH. In this environment, the availability of nutrients such as phosphorus, calcium and magnesium in the soil is significantly reduced. The phosphorus fixation rate increases with the decrease in pH, which reduces the content of available phosphorus in the soil, thereby affecting the absorption and utilization of phosphorus by plants. In addition, the loss of elements such as calcium and magnesium will also intensify, causing plants to show corresponding deficiency symptoms. Due to the increased activity of heavy metal elements such as aluminum and manganese in acidic soil, they are easily poisoned to plant roots. These toxic elements will destroy the cell structure of the root system and affect the normal physiological functions of the root system, such as reducing the ability to absorb water and nutrients, and even causing the root system to turn black and rot. Poor root development will further affect the plant's absorption and utilization of nutrients, resulting in weak plant growth and reduced yields.

[0003] As the main oil crop in the middle and lower reaches of the Yangtze River, Brassica napus is responsible for 1 / 3 of the oil source. my country's acidic soil is mainly distributed in the middle and lower reaches of the Yangtze River, which is highly overlapped with the rapeseed planting area. Therefore, it is very necessary to analyze the aluminum toxicity resistance mechanism of Brassica napus, the main oil 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 needs to be solved in the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, provide an acidic soil additive and its application, and solve the technical problem of how to promote the growth of plants in acidic soil in the prior art.

[0006] In order to achieve the above technical purpose, the technical solution of the present invention provides an acidic soil additive, including tartaric acid and calcium hydroxide.

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

[0008] In addition, the present invention also provides an application of the acidic soil additive in planting rapeseed.

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

[0010] Inorganic fertilizers are added to the acidic soil, and then the acidic soil is watered until it is thoroughly irrigated. Then rapeseed seeds are sown on the acidic soil, and covered with soil and film to retain water. After the rapeseed seeds germinate, the film is removed, and then the acidic soil additive is added to the acidic soil, and then water is applied to ensure normal growth of the rapeseed.

[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, KCl159-162 mg / kg, MgSO4·7H2O 250-255 mg / kg, H3BO3 2.84-2.9 mg / kg, MnCl2·4H2O1.81-1.85 mg / kg, Na2MoO4·2H2O 0.121-0.125 mg / kg, ZnSO4·7H2O0.221-0.225 mg / kg, CuSO4·5H2O 0.08-0.1 mg / kg.

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

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

[0014] In any embodiment, the watering ensures that the rapeseed grows normally by watering once every 3-4 days.

[0015] In any embodiment, 2-3 g 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 acidic soil additive proposed by the present invention includes tartaric acid and calcium hydroxide. With the combination of tartaric acid and calcium hydroxide, the toxicity of acidic soil to rapeseed can be significantly alleviated after rapeseed has grown continuously for a period of time, thereby promoting the growth of rapeseed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 These are the growth results of rapeseed in the seedling stage of Examples 1-3 and Comparative Example 1 of the present invention.

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

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

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

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

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

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

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

[0025] Fig. 9 The thousand-grain weight results of rapeseed at maturity in Examples 1-3 of the present invention and Comparative Example 1 are shown. DETAILED DESCRIPTION

[0026] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In the present application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0027] If there is no special explanation, the "include" and "comprising" mentioned in this application represent open-ended or closed-ended expressions. For example, the "include" and "comprising" may represent that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0028] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": 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, including tartaric acid and calcium hydroxide; the mass ratio of the tartaric acid to the calcium hydroxide is (2-9):(1-8).

[0030] Tartaric acid, as a key byproduct of sugar metabolism, is mainly produced by the decomposition pathway of ascorbic acid (vitamin C). Its chemical name is 2,3-dihydroxysuccinic acid. It is an organic carboxylic acid with a specific chemical structure, with a molecular formula of C4H6O6 and a molecular weight of 150.09 g / mol. In the plant kingdom, tartaric acid is particularly prominent as the main organic acid component in grape berries, and has an important influence on the flavor and texture of wine. The accumulation mechanism of tartaric acid shows a high degree of stability, and its content level is usually not easily affected by external environmental stress (such as drought, salt stress, etc.), changes in ecological conditions, or cultivation management measures in agricultural production practices (such as irrigation, fertilization, etc.).

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

[0032] This specific embodiment also proposes an application of the above-mentioned acidic soil additive in planting rapeseed, including: adding inorganic fertilizer to the acidic soil, then watering the acidic soil until it is thoroughly watered, then sowing rapeseed seeds on the acidic soil, covering the soil and film to retain water, removing the film after the rapeseed seeds germinate, then adding the acidic soil additive to the acidic soil, and then watering to ensure the normal growth of the rapeseed; the amount of the inorganic fertilizer added to the soil is: (NH4)2SO4 940-944mg / kg, KH2PO4 287-290mg / kg, KCl159-162mg / kg, MgSO4·7H2O 250-255mg / kg, H3BO32.84-2.9mg / kg, MnCl2·4H2O1.81-1.85mg / kg, Na2MoO4·2H2O 0.121-0.125mg / kg, ZnSO4·7H2O 0.221-0.225mg / kg, CuSO4·5H2O 0.08-0.1mg / kg; the pH value of the acidic soil is 5-5.1, and the content of ionic aluminum is 425-427mg / kg; the rapeseed seeds are Huayou No. 4 cabbage-type rapeseed; 2-3g of the acidic soil additive is added per kilogram of soil.

[0033] In some embodiments, the rapeseed is normally grown by watering once every 3-4 days.

[0034] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] In the present invention, reference is made to “some embodiments”, “this embodiment”, examples, etc., which describe a subset of all possible embodiments, but it can be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0036] If similar descriptions of "first / second" appear in the application documents, the following instructions are added. In the following description, the terms "first\second\third" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can 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 association relationship between associated objects, indicating that three relationships may exist. For example, object A and / or object B may represent three situations: object A exists alone, object A and object B exist at the same time, and object B exists alone.

[0038] Hereinafter, the embodiments of the present application will be described. The embodiments described below are exemplary and are only used to explain the present application, and should not be construed as limiting the present application. If no specific techniques or conditions are indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are used. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be obtained commercially.

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

[0040] Example 1

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

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

[0043] S1: Potted experiment Rapeseed was cultivated in the potted field of Huazhong Agricultural University. After the test soil was air-dried and sieved, 7 kg was weighed for each pot and placed in a Michaelis pot with a black polyethylene film inside. Inorganic fertilizers were added to the original soil after mixing evenly. The addition amount of inorganic fertilizers was: (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, Na2MoO4·2H2O0.121 mg / kg, ZnSO4·7H2O 0.221 mg / kg, CuSO4·5H2O 0.08 mg / kg. Water was poured into the potted soil until it was thoroughly watered. Select 30 rapeseed seeds of the same size, sow them evenly on the soil, cover them with soil and film to retain water, and remove the film after the seeds germinate.

[0044] S2: Adding an acidic soil additive to the uniformly mixed soil, the amount of the acidic soil additive 1 added is 2 g per kilogram of soil, and watering once every 3-4 days to ensure the normal growth of rapeseed.

[0045] Example 2

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

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

[0048] S1: Potted experiment Rapeseed was cultivated in the potted field of Huazhong Agricultural University. After the test soil was air-dried and sieved, 7 kg was weighed for each pot and placed in a Michaelis pot with a black polyethylene film inside. Inorganic fertilizers were added to the mixed original soil. The addition amount of inorganic fertilizers was: (NH4)2SO4 942 mg / kg, KH2PO4 290 mg / kg, KCl160 mg / kg, MgSO4·7H2O 253 mg / kg, H3BO3 2.88 mg / kg, MnCl2·4H2O1.85 mg / kg, Na2MoO4·2H2O 0.123 mg / kg, ZnSO4·7H2O 0.225 mg / kg, CuSO4·5H2O 0.1 mg / kg. Water was poured into the potted soil until it was thoroughly watered. Select 30 rapeseed seeds of the same size, sow them evenly on the soil, cover them with soil and film to retain water, and remove the film after the seeds germinate.

[0049] S2: Adding acidic soil additive 2 to the uniformly mixed soil, the amount of the acidic soil additive 2 added per kilogram of soil is 2.5 g, and watering once every 3-4 days to ensure the normal growth of rapeseed.

[0050] Example 3

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

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

[0053] S1: Potted experiment Rapeseed was cultivated in the potted field of Huazhong Agricultural University. After the test soil was air-dried and sieved, 7 kg was weighed for each pot and placed in a Michaelis pot with a black polyethylene film inside. Inorganic fertilizers were added to the original soil, and the amount of inorganic fertilizers added was: (NH4)2SO4 944 mg / kg, KH2PO4 288 mg / kg, KCl162 mg / kg, MgSO4·7H2O 255 ​​mg / kg, H3BO3 2.9 mg / kg, MnCl2·4H2O1.83 mg / kg, Na2MoO4·2H2O 0.125 mg / kg, ZnSO4·7H2O 0.222 mg / kg, CuSO4·5H2O 0.09 mg / kg. Water was poured into the potted soil until it was thoroughly watered. Select 30 rapeseed seeds of the same size, sow them evenly on the soil, cover them with soil and film to retain water, and remove the film after the seeds germinate.

[0054] S2: Adding an acidic soil additive to the uniformly mixed soil, the amount of the acidic soil additive 3 added to each kilogram of soil is 3 g, and watering once every 3-4 days to ensure the normal growth of rapeseed.

[0055] Comparative Example 1

[0056] This comparative example proposes the application of the above acidic soil additive in growing rapeseed, including:

[0057] S1: Potted experiment Rapeseed was cultivated in the potted field of Huazhong Agricultural University. After the test soil was air-dried and sieved, 7 kg was weighed for each pot and placed in a Michaelis pot with a black polyethylene film inside. Inorganic fertilizers were added to the original soil after mixing evenly. The addition amount of inorganic fertilizers was: (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, Na2MoO4·2H2O0.121 mg / kg, ZnSO4·7H2O 0.221 mg / kg, CuSO4·5H2O 0.08 mg / kg. Water was poured into the potted soil until it was thoroughly watered. Select 30 rapeseed seeds of the same size, sow them evenly on the soil, cover them with soil and film to retain water, and remove the film after the seeds germinate.

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

[0059] The pH of the above examples and comparative examples was measured by pH method in the following manner:

[0060] Weigh 10.00g of air-dried 20-mesh soil sample into a small beaker, add 25mL of distilled water. Shake at 28 degrees at 220r / min for 30min, let stand for 30min. Then measure with a pH meter. Add a reference sample for every 30 samples.

[0061] The above examples and comparative examples use the HNO3 method to determine the aluminum content in plants in the following manner:

[0062] Representative rapeseed with relatively consistent growth was selected and withered at 105°C for 30 min, dried in an oven at 65°C and weighed. 0.05 g of plant sample was weighed, digested by HNO3 method, and measured by inductively coupled plasma optical emission spectrometry (ICP-OES) (Agilent Technologies 5110, USA).

[0063] The method for determining the available phosphorus in the soil in the above-mentioned embodiments and comparative examples is carried out as follows:

[0064] Weigh 5.00 g of air-dried soil sample that has passed 20 mesh. Add 50 mL of extractant to a 150 mL plastic bottle, shake at 20-25°C for 30 min, with a shaking frequency of 200 times / min, and filter into a plastic bottle after taking it out.

[0065] Pipette 10mL of the filtrate into a 50mL volumetric flask, add 10mL of boric acid solution, then add 2 drops of dinitrophenol indicator, adjust the pH to slightly yellow with dilute HCl and NaOH solution, then add 5mL of molybdenum antimony anti-color developer, dilute with water and shake well, let stand at room temperature 20-25℃ for 30min. Colorimetric analysis at 700nm with a spectrophotometer. At the same time, perform blank and reference sample determination (blank is without soil sample, reference sample is a laboratory-made sample, other operations are the same as the soil sample determination, add one blank and reference sample to 20-30 soil samples).

[0066] The method for determining the alkaline nitrogen in the soil in the above-mentioned embodiments and comparative examples is carried out as follows:

[0067] Weigh 2.00g of air-dried soil sample with a mesh size of 20 and place it in the outer chamber of a clean diffusion dish. Gently rotate the diffusion dish to spread the soil sample evenly. Take 2mL of the mixed solution of boric acid-indicator and place it in the inner chamber of the diffusion dish. Then apply gum arabic to the edge of the outer chamber of the diffusion dish, cover it with frosted glass, and rotate it several times to make the diffusion dish and frosted glass completely bonded. Then turn off one side of the frosted glass, quickly add 10mL of 1mol / LNaOH solution to the outer chamber, cover it immediately, and gently rotate the diffusion dish to let the alkali solution cover all the soil. Then tighten it with a rubber band to fix the frosted glass, then carefully place it flat in a 40±1℃ constant temperature box, take it out after alkaline hydrolysis and diffusion for 24 hours (the inner chamber can be observed to be blue), and titrate the NH3 in the absorption liquid in the inner chamber with 0.1 mol / L or 0.01mol / L (1 / 2H2SO4) solution, and the titration color changes from blue-green to purple-red. Blank and reference samples were carried out simultaneously. The blank was without adding soil sample, and the reference sample was a laboratory-made sample. Other operations were the same as those for measuring soil samples. One blank reference sample was added to 20-30 soil samples).

[0068] The method for measuring the available potassium in the soil in the above-mentioned embodiments and comparative examples is carried out as follows:

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

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

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

[0072] The method for determining organic matter in soil in the above embodiments and comparative examples is 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, put it into a dry hard test tube, use a pipette to accurately add 5mL of 0.8000mol / L (1 / 6K2Cr2O7) standard solution (if the soil contains chloride, add 0.1g of Ag2SO4 first), use a syringe to add 5mL of concentrated H2SO4 and shake thoroughly, cover the tube with a small bent-necked funnel to condense the water vapor. Put it in a paraffin oil bath at a temperature of 185-190℃. After putting it in, the temperature of the oil bath should drop to about 170-180℃. Maintain the temperature. When the liquid in the test tube boils and bubbles appear, start timing. Boil for 5 minutes. Take out the test tube and cool it. Pour the contents of the test tube into a 250mL triangular flask. Wash the inside of the test tube and the small funnel with water. The total volume of the solution in the triangular flask is 60-70mL. Keep the concentration of (1 / 2H2SO4) in the mixed solution at 2-3mol / L. Then add 12-15 drops of 2-carboxyl diphenylamine indicator. At this time, the solution is brown-red. Use standard 0.2mol / L ferrous sulfate for titration. Shake the contents continuously during the titration until the color of the solution changes from brown-red to dark green (gray-blue-green) through purple, which is the end point of the titration. If using o-phenanthroline indicator, add 2-3 drops of indicator. The end point is 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 ratios as a treatment method can significantly promote the growth of rapeseed in acidic soil. In addition, the addition of additives in different ratios can also alleviate the toxic effects of acid-aluminum stress on rapeseed, effectively improving the growth phenotype of rapeseed.

[0075] Depend on Figure 2 It can be seen that under acidic soil conditions, the plant height of rapeseed is about 46.3cm without adding additives. After adding different ratios of additives to the soil, a significant increase in the aboveground dry weight of rapeseed was observed. This change indicates that the exogenous addition of different ratios of additives has a mitigating effect on the stress of rapeseed caused by acidic soil. However, the mitigation effect of different concentrations of tartaric acid on the adaptation of rapeseed to acidic soil is not consistent: in comparison, the mitigation effect brought by Additive 2 is not as good as that of Additive 3, which shows that as the proportion of tartaric acid increases, the mitigation effect on acidic soil becomes stronger and stronger, indicating that tartaric acid has a certain stoichiometric effect on the adaptation of rapeseed to acidic soil. The plant height of rapeseed with Additive 1 is as high as over 80cm.

[0076] Depend on Figure 3It can be seen that the pH of acidic soil is about 5.9, while the pH of soil treated with different additives (such as exogenous addition of tartaric acid and calcium hydroxide in different ratios) reaches 6.2 or above. This change not only improves the acid-base balance of the soil, but also helps to reduce the content and activity of active aluminum in the soil. This shows that under certain conditions, the buffering capacity of the soil system or other factors play an important role.

[0077] Depend on Figure 4 It can be seen that in acidic soil, the change in pH will affect the effectiveness of phosphorus in the soil, thereby affecting the content of available phosphorus. By measuring the available phosphorus content in different treatments, we found that the exogenous addition of additives in different ratios significantly reduced the available phosphorus content in the soil. The original available phosphorus content in acidic soil was about 3.1 mg / kg. After the exogenous addition of additives, the available phosphorus content was only 1.7 and 0.8 mg / kg, down to 80%, indicating that the exogenous addition of additives in different ratios will reduce the available phosphorus content in the soil.

[0078] Depend on Figure 5 It can be seen that soil alkaline nitrogen is an important form of soil nitrogen, reflecting the soil's recent nitrogen supply capacity, mainly including inorganic nitrogen and easily hydrolyzed organic nitrogen. When the exogenous additive ratio was 9:1 of tartaric acid: calcium hydroxide, the content of alkaline nitrogen was significantly reduced, indicating that increasing the proportion of tartaric acid would change the soil's nitrogen supply capacity.

[0079] Depend on Figure 6 It can be seen that available potassium, as a nutrient element necessary for crop photosynthesis, respiration and other physiological processes, plays a vital role in the growth and development of crops. An appropriate amount of available potassium can improve the stress resistance and disease resistance of crops and improve crop varieties. In this case, after treatment with exogenous additive 1, the content of available potassium was reduced, but exogenous additives 2 and additive 3 both significantly increased the content of available potassium. This shows that the mechanism of action of different ratios of additives on rapeseed's adaptation to acidic soil is not the same.

[0080] Depend on Figure 7 It can be seen that organic matter specifically refers to substances in the soil that come from life, such as animal and plant residues, microorganisms, and applied organic fertilizers. These substances undergo complex biochemical processes to form stable humus substances that are closely integrated with the soil and become an important component of soil fertility. No matter how the ratio of exogenous additives is changed, the content of organic matter will not be affected.

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

[0082] Depend on Fig. 9 It can be seen that in the process of predicting yield in the field, the determination of thousand-grain weight can assist in predicting the field yield of crops and further be used to evaluate the seed characteristics of different varieties or strains. After adding different proportions of additives exogenously, the thousand-grain weight of rapeseed can be significantly increased. The thousand-grain weight of rapeseed corresponding to additive 1 is as high as 4g or more, which can be an important indicator for evaluating the adaptability of tartaric acid to rapeseed to acidic soil.

[0083] From the overall results, the exogenous addition of tartaric acid and calcium hydroxide mixtures in different ratios can significantly increase the adaptability of rapeseed to acidic soil. The present invention explores different additives to increase the adaptability of rapeseed to acidic soil from the perspectives of rapeseed's own growth, plant height, soil pH, available phosphorus, alkaline nitrogen, available potassium, organic matter, and yield at maturity.

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

Claims

1. An acidic soil additive, characterized in that: Includes tartaric acid and calcium hydroxide.

2. The acidic soil additive according to claim 1, characterized in that: The mass ratio of the tartaric acid to the calcium hydroxide is (2-9):(1-8).

3. Use of the acidic soil additive according to any one of claims 1 to 2 in growing rapeseed.

4. The use according to claim 3, characterized in that: The following steps are involved: Inorganic fertilizers are added to the acidic soil, and then the acidic soil is watered until it is thoroughly irrigated. Then rapeseed seeds are sown on the acidic soil, and covered with soil and film to retain water. After the rapeseed seeds germinate, the film is removed, and then the acidic soil additive is added to the acidic soil, and then water is applied to ensure normal growth of the rapeseed.

5. The use according to claim 4, characterized in that: 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 0.121-0.125mg / kg, ZnSO4·7H2O 0.221-0.225mg / kg, CuSO4·5H2O 0.08-0.1mg / kg.

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

7. The use according to claim 4, characterized in that: The rapeseed seeds are Huayou No. 4 cabbage-type rapeseed.

8. The use according to claim 4, characterized in that: The watering ensures that the rapeseed grows normally by watering once every 3-4 days.

9. The use according to claim 4, characterized in that: Add 2-3 g of the acidic soil additive per kilogram of soil.

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