A calcium-containing water-soluble compound fertilizer and preparation method thereof

Abstract

The invention discloses a calcium-containing water-soluble compound fertilizer and a preparation method thereof, and relates to the technical field of fertilizer production, including macroelements, medium elements, trace elements, supplements and adjuvants; the macroelements are composed of nitrogen fertilizer, phosphorus fertilizer and potash fertilizer; the medium elements are composed of a mixture of calcium formate and calcium acetate; the trace elements are composed of a mixture of zinc sulfate, magnesium borate, sodium tetraborate, iron sulfite, manganese sulfate monohydrate and sodium selenite; the supplement is composed of a mixture of chitosan and wood vinegar. The advantages of this scheme are as follows: first, the calcium ion content is relatively high, which enables plants to replenish calcium ions in time during the growth process and accelerates plant growth. Second, under the action of a dispersant, the insoluble matter in the finished water-soluble compound fertilizer of this scheme is basically 0, which ensures that the product will not block the drip irrigation pipeline during the drip irrigation process, and ensures that the plant can receive nutrients normally.

Description

Technical Field

[0001] The invention belongs to the technical field of fertilizer production, and in particular relates to a calcium-containing water-soluble compound fertilizer and a preparation method thereof. Background Art

[0002] Water Soluble Fertilizer (WSF) is a multi-component compound fertilizer that can be completely soluble in water. It can dissolve quickly in water and is more easily absorbed by crops. Its absorption and utilization rate is relatively high. More importantly, it can be used in facility agriculture such as sprinkler and drip irrigation to achieve water-fertilizer integration and save water, fertilizer and labor.

[0003] Compared with traditional superphosphate, granulated compound fertilizer and other varieties, water-soluble fertilizer has obvious advantages. Its main features are small dosage, convenient use, low cost, fast crop absorption and extremely high nutrient utilization rate.

[0004] After using water-soluble fertilizers, the soil is relatively moist and contains a large amount of nutrients. These nutrients will not only be absorbed by the plant roots, but also cause some pathogens that affect the growth and development of the plant roots to grow rapidly. These pathogens will compete with the plants for nutrients. At the same time, they will also attack the plant roots, causing lesions in the plant roots, ultimately affecting plant yields, and in severe cases, affecting the survival rate of the plants.

[0005] Therefore, how to supplement nutrients for plants while reducing the invasion of pathogens into plants is one of the problems currently faced by water-soluble fertilizers.

[0006] To this end, the Chinese patent with application number "CN201911126080.4" discloses "composite chitin plant water-soluble fertilizer and preparation method thereof", and its technical solution is: "The present invention further chemically-hydrothermally reacts non-water-soluble chitosan, citric acid, urea, nano-copper oxide and nano-iron oxide under mild conditions, thereby being able to produce green, environmentally friendly and antibacterial water-soluble fertilizer particles at low cost."

[0007] The water-soluble fertilizer particles provided by the above scheme have the following disadvantages: lack of multiple trace elements, such as calcium, which is one of the important elements indispensable for promoting plant growth. If calcium is lacking, the growth rate of plant roots will be relatively slow, which will eventually lead to the plant roots absorbing other nutrients at a relatively slow rate.

[0008] To solve the above problems, it can be mixed with other water-soluble fertilizers containing calcium, such as the Chinese patent with application number "CN201310533152.3", which discloses a "method for producing highly water-soluble calcium-phosphorus fertilizer". Its technical scheme is: "The method comprises the following steps: a. adding a calcium-containing compound to the raw material wet-process phosphoric acid, filtering after reaction; adding sulfide to the filtered acid solution, filtering after reaction; b. reacting the raw material phosphate rock powder with the acid solution treated in step a; the amount of phosphoric acid used is the theoretical amount of the reaction. 500% or more; c. heat-insulate the slurry after the acid hydrolysis reaction to make it thick; d. move the thickened supernatant to a cooling crystallization tank, cool and crystallize it, and separate the solid and liquid; e. add water to the filter residue obtained in step d to make a slurry, and then heat-insulate it to make it thick; f. send the thickened supernatant to a dryer with a high-temperature airflow to dry it, and after drying, obtain the product of phosphorus-calcium water-soluble fertilizer. The present invention can control the water-insoluble matter of the product to less than 3%, the main content to more than 98%, and has low cost, high phosphorus utilization rate, and less waste residue discharge.

[0009] However, in the first technical solution, the raw material "potassium dihydrogen phosphate" is proposed in the specification, but potassium dihydrogen phosphate will precipitate with calcium ions, which means that even if the first solution and the second solution are mixed, the calcium ions will precipitate, making it difficult for plants to absorb calcium. Summary of the invention

[0010] In view of the above defects, the purpose of the present invention is to provide a calcium-containing water-soluble compound fertilizer and a preparation method thereof, aiming to solve the problem of lack of calcium in water-soluble fertilizers in the prior art.

[0011] In order to solve the above technical problems, the technical solution of the present invention is:

[0012] A calcium-containing water-soluble compound fertilizer, comprising, by weight, 30-40 parts of macroelements, 14-20 parts of secondary elements, 8-15 parts of trace elements, 10-15 parts of supplements and 5-10 parts of adjuvants;

[0013] The macronutrients are composed of 30-50 parts of nitrogen fertilizer, 20-30 parts of phosphorus fertilizer and 15-20 parts of potash fertilizer;

[0014] The intermediate element is composed of 40-60 parts of calcium formate and 20-40 parts of calcium acetate;

[0015] The trace elements are composed of a mixture of zinc sulfate, magnesium borate, sodium tetraborate, ferrous sulfite, manganese sulfate monohydrate, and sodium selenite;

[0016] The supplement consists of a mixture of chitosan and wood vinegar;

[0017] The auxiliary agent is composed of a mixture of a dispersant, a penetrant, a film-forming agent and deionized water.

[0018] Wherein, the nitrogen fertilizer is urea; the phosphate fertilizer is composed of a mixture of calcium phosphate and diammonium phosphate, with calcium phosphate accounting for 60-80 parts and diammonium phosphate accounting for 20-40 parts by weight; and the potash fertilizer is potassium sulfate.

[0019] Wherein, the trace elements are composed of 30-40 parts of zinc sulfate, 10-20 parts of magnesium borate, 10-20 parts of sodium tetraborate, 10-15 parts of ferrous sulfite, 4-5 parts of manganese sulfate monohydrate, and 2-3 parts of sodium selenite.

[0020] Wherein, the supplement is composed of 30-40 parts of chitosan and 40-60 parts of wood vinegar in parts by weight.

[0021] Wherein, in terms of weight, the auxiliary agent is composed of 10-20 parts of dispersant, 25-30 parts of penetrant, 20-25 parts of film-forming agent and 25-45 parts of deionized water; the dispersant is composed of a mixture of 60-75 parts of sodium dodecylbenzene sulfonate and 25-40 parts of polyoxyethylene ether; the penetrant is composed of a mixture of 20-30 parts of KY-1028 silicone penetrant, 25-30 parts of polyacrylamide and 30-40 parts of lecithin; the film-forming agent is composed of a mixture of fucoidan extract, polymethacrylate and polylactic acid aqueous emulsion.

[0022] A method for preparing a calcium-containing water-soluble compound fertilizer comprises the following steps:

[0023] Step 1, supplement preparation;

[0024] The corn stalks are crushed into powder by a crusher and dried naturally; the dried powder is sent to an ultrasonic extraction device, and 75% ethanol is added to the ultrasonic extraction device at the same time, and the residue is filtered out after the extraction is completed to obtain an extract; the extract is then mixed with ethyl acetate, and allowed to stand for 15-24 hours, and then the mixture is subjected to rotary film evaporation to recover ethyl acetate and ethanol to obtain wood vinegar; chitosan is added to the wood vinegar, stirred and mixed, and then allowed to stand for 4-5 hours, and impurities are filtered out to obtain a supplement;

[0025] Step 2, preparation of auxiliary agent;

[0026] The kelp is washed, sent to an oven for drying, and then sent to a crusher for crushing to 60-70 meshes to obtain kelp powder; the kelp powder is sequentially mixed with deionized water and hydrogen chloride to obtain an acidic extract; the acidic extract is sent to an ultrasonic extraction device, the extraction temperature is 75-80°C, the extraction time is 20-30min, and an extract is obtained, the extract is filtered and centrifuged to obtain a supernatant, a dilute alkali solution is added to the supernatant, and the pH value of the supernatant is adjusted to 6.8-7.2 to obtain a fucoidan extract; polymethacrylate, fucoidan extract and polylactic acid aqueous emulsion are mixed to obtain a film-forming agent; the film-forming agent is sequentially mixed with a dispersant and a penetrant as an auxiliary agent;

[0027] Step 3, preparing water-soluble compound fertilizer;

[0028] The macroelements, secondary elements, trace elements, supplements and adjuvants are sent to a mixing kettle for stirring and mixing, and then deionized water is added to prepare an aqueous solution, a pH regulator is added to adjust the pH value of the aqueous solution to 5.8-6.7, and then the aqueous solution is filtered to obtain a water-soluble compound fertilizer.

[0029] Wherein, in step 1, the moisture content of the powder after natural drying is less than 5%.

[0030] Wherein, in step 2, the dilute alkali solution is a sodium hydroxide solution.

[0031] Wherein, in step 2, by weight, the fucoidan extract is 50-60 parts, the polymethacrylate is 10-20 parts, and the polylactic acid aqueous emulsion is 20-30 parts.

[0032] Wherein, in step three, the pH adjuster is acetic acid and / or citric acid.

[0033] After adopting the above technical solution, the beneficial effects of this solution are:

[0034] First, the calcium ion content is relatively high, which enables plants to replenish calcium ions in time during the growth process and accelerate plant growth. Second, under the action of the dispersant, the insoluble matter in the finished water-soluble compound fertilizer of this scheme is basically zero, which ensures that this product will not block the drip irrigation pipe during the drip irrigation process and ensures that the plants can receive nutrients normally. Third, under the action of the film-forming agent, the various nutrients in this product can be slowly released, making the fertility more lasting and effective. Fourth, under the action of the permeabilizer, this product improves the bioavailability and helps plants better absorb water and nutrients, thereby improving the growth performance and yield of crops. Fifth, under the action of the supplement, the pathogenic bacteria that affect the roots of plants can be effectively inhibited, which assists the normal development and growth of the plant roots. DETAILED DESCRIPTION

[0035] Example:

[0036] A calcium-containing water-soluble compound fertilizer, comprising, by weight, 30-40 parts of macroelements, 14-20 parts of secondary elements, 8-15 parts of trace elements, 10-15 parts of supplements and 5-10 parts of adjuvants;

[0037] The macronutrients consist of 30-50 parts of nitrogen fertilizer, 20-30 parts of phosphorus fertilizer, and 15-20 parts of potassium fertilizer;

[0038] The intermediate element is composed of 40-60 parts of calcium formate and 20-40 parts of calcium acetate;

[0039] The trace elements are composed of a mixture of zinc sulfate, magnesium borate, sodium tetraborate, ferrous sulfite, manganese sulfate monohydrate, and sodium selenite;

[0040] The supplement is composed of a mixture of chitosan and wood vinegar. Chitosan has many unique properties such as biodegradability, cell affinity and biological effects, which makes it easily absorbed by plant cells and has a certain killing effect on pathogenic bacteria in the soil. Spraying wood vinegar on the soil can prevent seed damping-off disease and can also be used as a soil disinfectant. Applying wood vinegar in the soil can effectively inhibit the reproduction of microorganisms that hinder plant growth, kill pests such as root-knot nematodes, and promote the growth of vegetables, fruit trees, flowers, rice, lawns and other plants.

[0041] Since chitosan is difficult to dissolve in water but easily soluble in acetic acid, and one of the components of wood vinegar is acetic acid, chitosan can be used in combination with wood vinegar, which allows the functions of the two to be superimposed. At the same time, it can also be applied to water-soluble fertilizers for use, which allows the water-soluble fertilizers to supplement nutrients for plants while reducing the chance of plant root diseases.

[0042] The auxiliary agent is composed of a mixture of a dispersant, a penetrant, a film-forming agent and deionized water.

[0043] The nitrogen fertilizer is urea; the phosphate fertilizer is composed of a mixture of calcium phosphate and diammonium phosphate, with calcium phosphate accounting for 60-80 parts and diammonium phosphate accounting for 20-40 parts by weight; and the potash fertilizer is potassium sulfate.

[0044] In terms of weight, the trace elements are composed of 30-40 parts of zinc sulfate, 10-20 parts of magnesium borate, 10-20 parts of sodium tetraborate, 10-15 parts of ferrous sulfite, 4-5 parts of manganese sulfate monohydrate, and 2-3 parts of sodium selenite.

[0045] The supplement is composed of 30-40 parts of chitosan and 40-60 parts of wood vinegar in parts by weight.

[0046] In terms of weight, the auxiliary agent is composed of 10-20 parts of dispersant, 25-30 parts of penetrant, 20-25 parts of film-forming agent and 25-45 parts of deionized water; the dispersant is composed of 60-75 parts of sodium dodecylbenzene sulfonate mixed with 25-40 parts of polyoxyethylene ether; the penetrant is composed of 20-30 parts of KY-1028 silicone penetrant, 25-30 parts of polyacrylamide and 30-40 parts of lecithin; the film-forming agent is composed of polymethacrylate, fucoidan extract and polylactic acid aqueous emulsion.

[0047] In this scheme, the role of the dispersant is to improve the solubility and uniformity of the fertilizer and the dispersion ability of the various components in the fertilizer in water. The role of the penetrant is to improve the permeability of the water-soluble fertilizer and the absorption efficiency of the plant. The role of the film-forming agent is to improve the adhesion of the water-soluble fertilizer, form a protective film layer, reduce the loss of fertilizer, and prolong the action time of fertilizer.

[0048] Sodium dodecylbenzene sulfonate is an anionic surfactant that can effectively reduce the surface tension of liquids; polyoxyethylene ether, as a nonionic surfactant, can work in synergy with anionic surfactants. The use of the two together can improve the dispersibility of particles in the liquid, so that when preparing fertilizers, the active ingredients can be more evenly dispersed in the liquid, improving the use effect. The addition of polyoxyethylene ether can also improve the thermal stability of the formula, reduce precipitation and stratification, and thus extend the shelf life of the product.

[0049] Polyacrylamide can enhance soil stability, reduce soil erosion, and improve soil's ability to resist erosion. It can also improve soil's water retention capacity, help keep soil moist, and improve plant growth environment. Lecithin can increase cell membrane permeability and improve nutrient absorption rate. The film-forming agent is composed of a mixture of polymethacrylate, fucoidan extract and polylactic acid aqueous emulsion. Polymethacrylate is used to form a thicker protective film that can effectively resist external environmental influences. Fucoidan is rich in polysaccharides and trace elements, which helps to improve plant nutrient absorption. Fucoidan can also improve soil water retention and air permeability, and promote the growth of plant roots.

[0050] A method for preparing a calcium-containing water-soluble compound fertilizer comprises the following steps:

[0051] Step 1, supplement preparation;

[0052] The corn stalks are crushed into powder by a crusher and dried naturally; the dried powder is sent to an ultrasonic extraction device, and 75% ethanol is added to the ultrasonic extraction device at the same time, and the residue is filtered out after the extraction is completed to obtain an extract; the extract is then mixed with ethyl acetate, and allowed to stand for 15-24 hours, and then the mixture is subjected to rotary film evaporation to recover ethyl acetate and ethanol to obtain wood vinegar; chitosan is added to the wood vinegar, stirred and mixed, and then allowed to stand for 4-5 hours, and impurities are filtered out to obtain a supplement;

[0053] The extract is mixed with ethyl acetate and left to stand for 15-24 hours. The purpose is to facilitate the extraction of effective ingredients in the extract by ethyl acetate. If it is less than 15 hours, the extraction effect will not meet the standard, and if it is more than 24 hours, it will consume more time, which has a great impact on production efficiency. The same is true when chitosan is added to wood vinegar and stirred and mixed and left to stand for 4-5 hours.

[0054] Step 2, preparation of auxiliary agent;

[0055] The kelp is washed, sent to an oven for drying, and then sent to a crusher for crushing to 60-70 meshes to obtain kelp powder; the kelp powder is sequentially mixed with deionized water and hydrogen chloride to obtain an acidic extract; the acidic extract is sent to an ultrasonic extraction device, the extraction temperature is 75-80°C, the extraction time is 20-30min, an extract is obtained, the extract is filtered and centrifuged to obtain a supernatant, a dilute alkali solution is added to the supernatant, the pH value of the supernatant is adjusted to 6.8-7.2, and a fucoidan extract is obtained; polymethacrylate, fucoidan extract and polylactic acid aqueous emulsion are mixed to obtain a film-forming agent; the film-forming agent is sequentially mixed with a dispersant and a penetrant to obtain an auxiliary agent.

[0056] The purpose of adding dilute alkali solution to the supernatant is to adjust the supernatant to neutral. In order to facilitate the control of pH adjustment, the pH value of the supernatant only needs to be between 6.8 and 7.2.

[0057] Step 3, preparing water-soluble compound fertilizer;

[0058] The macroelements, medium elements, trace elements, supplements and adjuvants are sent to a mixing kettle for stirring and mixing, and then deionized water is added to make an aqueous solution, and a pH regulator is added to adjust the pH value of the aqueous solution to 5.8-6.7, and then the aqueous solution is filtered to obtain a water-soluble compound fertilizer. The pH value of the finished water-soluble compound fertilizer is weakly acidic, which makes this product suitable for alkaline plots and improves the alkaline plots to the first degree, making the alkaline plots more suitable for plant growth.

[0059] In step 1, the moisture content of the powder after natural drying is less than 5%.

[0060] In step 2, the dilute alkali solution is a sodium hydroxide solution.

[0061] In step 2, by weight, the fucoidan extract is 50-60 parts, the polymethacrylate is 10-20 parts, and the polylactic acid aqueous emulsion is 20-30 parts.

[0062] In order to prevent the pH value of the finished water-soluble compound fertilizer from being too low, in step three, the pH regulator is a weak acid, preferably acetic acid and / or citric acid.

[0063] Embodiment 1:

[0064] According to the above scheme, a calcium-containing water-soluble compound fertilizer is prepared, wherein:

[0065] Includes 30 macroelements, 14 secondary elements, 8 trace elements, 10 supplements and 5 auxiliary agents;

[0066] The macronutrients consist of 30 parts nitrogen, 20 parts phosphorus, and 15 parts potassium;

[0067] The medium element consists of 40 parts of calcium formate mixed with 20 parts of calcium acetate;

[0068] The phosphate fertilizer contains 60 parts of calcium phosphate and 20 parts of diammonium phosphate;

[0069] The trace elements are composed of 30 parts of zinc sulfate, 10 parts of magnesium borate, 10 parts of sodium tetraborate, 10 parts of ferrous sulfite, 4 parts of manganese sulfate monohydrate, and 2 parts of sodium selenite;

[0070] The supplement consisted of 30 parts chitosan mixed with 40 parts wood vinegar;

[0071] The auxiliary agent consists of 10 parts of dispersant, 25 parts of penetrant, 20 parts of film-forming agent and 25 parts of deionized water.

[0072] The dispersant is composed of 60 parts of sodium dodecylbenzene sulfonate and 25 parts of polyoxyethylene ether.

[0073] The penetrant is composed of a mixture of 20 parts of KY-1028 silicone penetrant, 25 parts of polyacrylamide and 30 parts of lecithin.

[0074] The film-forming agent is composed of 10 parts of polymethacrylate, 50 parts of fucoidan extract and 20 parts of polylactic acid aqueous emulsion.

[0075] Embodiment 2:

[0076] The difference between this embodiment and embodiment 1 is that:

[0077] Includes 34 macroelements, 16 secondary elements, 10 trace elements, 12 supplements and 7 auxiliary agents;

[0078] The macronutrients consist of 35 parts nitrogen, 24 parts phosphorus, and 16 parts potassium;

[0079] The medium element is composed of 45 parts of calcium formate mixed with 30 parts of calcium acetate;

[0080] The phosphate fertilizer contains 65 parts of calcium phosphate and 25 parts of diammonium phosphate;

[0081] The trace elements are composed of 34 parts of zinc sulfate, 14 parts of magnesium borate, 14 parts of sodium tetraborate, 11 parts of ferrous sulfite, 4.2 parts of manganese sulfate monohydrate, and 2.3 parts of sodium selenite;

[0082] The supplement consisted of 34 parts chitosan mixed with 45 parts wood vinegar;

[0083] The auxiliary agent consists of 14 parts of dispersant, 26 parts of penetrant, 22 parts of film-forming agent and 28 parts of deionized water.

[0084] The dispersant is composed of 65 parts of sodium dodecylbenzene sulfonate and 30 parts of polyoxyethylene ether.

[0085] The penetrant is composed of 25 parts of KY-1028 silicone penetrant, 27 parts of polyacrylamide and 35 parts of lecithin;

[0086] The film-forming agent is composed of 15 parts of polymethacrylate, 55 parts of fucoidan extract and 25 parts of polylactic acid aqueous emulsion.

[0087] Embodiment 3:

[0088] The difference between this embodiment and embodiment 1 is that:

[0089] Includes 38 macroelements, 18 secondary elements, 13 trace elements, 14 supplements and 8 auxiliary agents;

[0090] The macronutrients consist of 40 parts nitrogen, 28 parts phosphorus, and 18 parts potassium;

[0091] The intermediate element is composed of 55 parts of calcium formate mixed with 35 parts of calcium acetate;

[0092] The phosphate fertilizer contains 75 parts of calcium phosphate and 35 parts of diammonium phosphate;

[0093] The trace elements are composed of 38 parts of zinc sulfate, 18 parts of magnesium borate, 18 parts of sodium tetraborate, 14 parts of ferrous sulfite, 4.8 parts of manganese sulfate monohydrate, and 2.7 parts of sodium selenite;

[0094] The supplement consisted of 38 parts chitosan mixed with 55 parts wood vinegar;

[0095] The auxiliary agent consists of 18 parts of dispersant, 28 parts of penetrant, 24 parts of film-forming agent and 38 parts of deionized water.

[0096] The dispersant is composed of 72 parts of sodium dodecylbenzene sulfonate and 35 parts of polyoxyethylene ether.

[0097] The penetrant is composed of 28 parts of KY-1028 silicone penetrant, 29 parts of polyacrylamide and 38 parts of lecithin;

[0098] The film-forming agent is composed of 18 parts of polymethacrylate, 58 parts of fucoidan extract and 28 parts of polylactic acid aqueous emulsion.

[0099] Embodiment 4:

[0100] The difference between this embodiment and embodiment 1 is that:

[0101] Includes 40 parts of macroelements, 20 parts of secondary elements, 15 parts of trace elements, 15 parts of supplements and 10 parts of auxiliary agents;

[0102] The macronutrients consist of 50 parts nitrogen fertilizer, 30 parts phosphorus fertilizer and 20 parts potassium fertilizer;

[0103] The medium element is composed of 60 parts of calcium formate mixed with 40 parts of calcium acetate;

[0104] The phosphate fertilizer contains 80 parts of calcium phosphate and 40 parts of diammonium phosphate;

[0105] The trace elements are composed of 40 parts of zinc sulfate, 20 parts of magnesium borate, 20 parts of sodium tetraborate, 15 parts of ferrous sulfite, 5 parts of manganese sulfate monohydrate, and 3 parts of sodium selenite;

[0106] The supplement consisted of 40 parts chitosan mixed with 60 parts wood vinegar;

[0107] The auxiliary agent is composed of 20 parts of dispersant, 30 parts of penetrant, 25 parts of film-forming agent and 45 parts of deionized water.

[0108] The dispersant is composed of 75 parts of sodium dodecylbenzene sulfonate and 40 parts of polyoxyethylene ether.

[0109] The penetrant is composed of 30 parts of KY-1028 silicone penetrant, 30 parts of polyacrylamide and 40 parts of lecithin;

[0110] The film-forming agent is composed of 20 parts of polymethacrylate, 60 parts of fucoidan extract and 30 parts of polylactic acid aqueous emulsion.

[0111] Comparative Example 1:

[0112] The difference between this comparative example and Example 1 is that no dispersant is used.

[0113] Comparative Example 2:

[0114] The difference between this comparative example and Example 1 is that the amount of the dispersant used is 3 parts.

[0115] Comparative Example 3:

[0116] The difference between this comparative example and Example 1 is that no film-forming agent is used.

[0117] Comparative Example 4:

[0118] The difference between this comparative example and Example 1 is that the amount of the film-forming agent used is 5 parts.

[0119] Comparative Example 5:

[0120] This comparative example is different from Example 1 in that no supplement is used.

[0121] Comparative Example 6:

[0122] The difference between this comparative example and Example 1 is that the amount of the supplement is 3 parts.

[0123] The water-soluble compound fertilizer products in Examples 1 to 4 and Comparative Examples 1 to 2 were taken respectively, and the insoluble matter contents thereof were shown in the following table:

[0124]

[0125] It can be seen from the above table that the dispersant can greatly reduce the content of insoluble matter in the finished water-soluble compound fertilizer. For example, in Comparative Example 2, even if the amount of dispersant used is small, its insoluble matter content is much lower than that in Comparative Example 1 where no dispersant is used.

[0126] Taking pakchoi as the experimental object, the finished water-soluble compound fertilizers in Examples 1 to 4 and Comparative Examples 3 to 4 were taken, and three water-soluble fertilizers A, B, and C were randomly purchased from the market. The trade name of A is Topcal, and its manufacturer is Milagro International Co., Ltd. of Italy. Its main ingredients (g / L) are: calcium (232g), boron (1.3g), and magnesium (1g).

[0127] The trade name of B is Baishi Calcium, and its manufacturer is Japan Global System Co., Ltd. Its main raw material is calcium formate, and the registered technical indicators are: Ca ≥ 10%.

[0128] The trade name of C is Micro-Dry, and its manufacturer is Poland's Adam Ltd. Its main technical indicators are: Ca (6.5%), Zn (0.2%), Cu (0.1%), B (0.5%), Mg (3.5%), Fe (0.1%), Mn (0.05%), and Mo (0.1%).

[0129] The above fertilizers were diluted with water and drip-irrigated on pakchoi (one month after germination). Samples were taken from the pakchoi roots to test their calcium content (mg / 100g). The results are shown in the following table:

[0130]

[0131] As can be seen from the above table, since Examples 1-4 use film-forming agents, the calcium content in the root system of Chinese cabbage is in a decreasing state from 5.2 to 5.12, but the decrease is relatively stable, which shows that the film-forming agent can play a sustained release effect; and since Comparative Example 3 does not use a film-forming agent, its calcium content is the highest on 5.2 days, even much higher than Examples 1-4, and it shows a cliff-like decline on 5.8 and 5.12 days, respectively. This is because calcium ions are released in large quantities at the beginning without the constraints of film-forming agents, so that the root system absorbs more calcium ions, but under the influence of various external conditions, calcium ions are lost, which causes the subsequent calcium ions absorbed by the root system of Chinese cabbage to drop sharply. Comparative Example 4 uses a small amount of film-forming agent, so although its root calcium ion content also drops significantly on 5.8 and 5.12 days, the overall situation is better than Comparative Example 3, which shows that the film-forming agent can achieve a sustained release effect.

[0132] Compared with the three fertilizers A, B and C, the calcium ion content of Examples 1 to 4 is higher.

[0133] Still taking pakchoy (one month after germination) as the experimental object, six groups of pakchoy were taken, and the soil of the pakchoy in the af group was inoculated with pythium. Three days later, the finished water-soluble compound fertilizers in Examples 1 to 4 and Comparative Examples 5 to 6 were taken, and the pakchoy in the af group was drip-irrigated after adding water. The growth of the pakchoy was observed, and the results are as follows:

[0134]

[0135] As can be seen from the table above, the supplement can effectively kill Pythium and assist the normal growth of plants. In Comparative Example 5, since no supplement was used, the roots of the plants were infected by Pythium, and then gradually withered and died. In Comparative Example 6, since a small amount of supplement was used, the plants were able to resist Pythium to a certain extent, but eventually the disease occurred due to insufficient efficacy.

[0136] In summary, this solution has the following advantages: First, the calcium ion content is relatively high, which enables plants to replenish calcium ions in time during the growth process and accelerate plant growth. Second, under the action of the dispersant, the insoluble matter in the finished water-soluble compound fertilizer of this solution is basically zero, which ensures that this product will not block the drip irrigation pipe during the drip irrigation process and ensures that the plants can receive nutrients normally. Third, under the action of the film-forming agent, the various nutrients in this product can be slowly released, making the fertility more lasting and effective. Fourth, under the action of the supplement, the pathogenic bacteria that affect the plant roots can be effectively inhibited, which assists the normal development and growth of the plant roots. Fifth, under the action of the permeabilizer, this product improves the bioavailability and helps plants better absorb water and nutrients, thereby improving the growth performance and yield of crops.

[0137] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by ordinary technicians in this field based on the above-mentioned concepts without creative work are all within the protection scope of the present invention.

Claims

1. A calcium-containing water-soluble compound fertilizer, characterized in that: By weight, it includes 30-40 parts of macroelements, 14-20 parts of secondary elements, 8-15 parts of trace elements, 10-15 parts of supplements and 5-10 parts of auxiliary agents; The macronutrients are composed of 30-50 parts of nitrogen fertilizer, 20-30 parts of phosphorus fertilizer and 15-20 parts of potash fertilizer; The intermediate element is composed of 40-60 parts of calcium formate and 20-40 parts of calcium acetate; The trace elements are composed of a mixture of zinc sulfate, magnesium borate, sodium tetraborate, ferrous sulfite, manganese sulfate monohydrate, and sodium selenite; The supplement consists of a mixture of chitosan and wood vinegar; The auxiliary agent is composed of a mixture of a dispersant, a penetrant, a film-forming agent, and deionized water; The auxiliary agent is composed of 10-20 parts of dispersant, 25-30 parts of penetrant, 20-25 parts of film-forming agent and 25-45 parts of deionized water; the dispersant is composed of 60-75 parts of sodium dodecylbenzene sulfonate mixed with 25-40 parts of polyoxyethylene ether; the penetrant is composed of 20-30 parts of KY-1028 silicone penetrant, 25-30 parts of polyacrylamide and 30-40 parts of lecithin; the film-forming agent is composed of a mixture of fucoidan extract, polymethacrylate and polylactic acid aqueous emulsion; The nitrogen fertilizer is urea; the phosphate fertilizer is composed of a mixture of calcium phosphate and diammonium phosphate, with calcium phosphate accounting for 60-80 parts and diammonium phosphate accounting for 20-40 parts by weight; and the potash fertilizer is potassium sulfate.

2. The calcium-containing water-soluble compound fertilizer according to claim 1, characterized in that In terms of weight, the trace elements are composed of 30-40 parts of zinc sulfate, 10-20 parts of magnesium borate, 10-20 parts of sodium tetraborate, 10-15 parts of ferrous sulfite, 4-5 parts of manganese sulfate monohydrate, and 2-3 parts of sodium selenite.

3. The calcium-containing water-soluble compound fertilizer according to claim 1, characterized in that In terms of weight, the supplement is composed of 30-40 parts of chitosan and 40-60 parts of wood vinegar.

4. A method for preparing the calcium-containing water-soluble compound fertilizer according to claim 1, characterized in that: The steps include: Step 1, supplement preparation; The corn stalks are crushed into powder by a crusher and dried naturally; the dried powder is sent to an ultrasonic extraction device, and 75% ethanol is added to the ultrasonic extraction device at the same time, and the residue is filtered out after the extraction is completed to obtain an extract; the extract is then mixed with ethyl acetate, and allowed to stand for 15-24 hours, and then the mixture is subjected to rotary film evaporation to recover ethyl acetate and ethanol to obtain wood vinegar; chitosan is added to the wood vinegar, stirred and mixed, and then allowed to stand for 4-5 hours, and impurities are filtered out to obtain a supplement; Step 2, preparation of auxiliary agent; The kelp is washed, sent to an oven for drying, and then sent to a crusher for crushing to 60-70 meshes to obtain kelp powder; the kelp powder is sequentially mixed with deionized water and hydrogen chloride to obtain an acidic extract; the acidic extract is sent to an ultrasonic extraction device, the extraction temperature is 75-80°C, the extraction time is 20-30min, and an extract is obtained, the extract is filtered and centrifuged to obtain a supernatant, a dilute alkali solution is added to the supernatant, and the pH value of the supernatant is adjusted to 6.8-7.2 to obtain a fucoidan extract; polymethacrylate, fucoidan extract and polylactic acid aqueous emulsion are mixed to obtain a film-forming agent; the film-forming agent is sequentially mixed with a dispersant and a penetrant as an auxiliary agent; Step 3, preparing water-soluble compound fertilizer; The macroelements, secondary elements, trace elements, supplements and adjuvants are sent to a mixing kettle for stirring and mixing, and then deionized water is added to prepare an aqueous solution, a pH regulator is added to adjust the pH value of the aqueous solution to 5.8-6.7, and then the aqueous solution is filtered to obtain a water-soluble compound fertilizer.

5. The method for preparing a calcium-containing water-soluble compound fertilizer according to claim 4, characterized in that: In step 1, the moisture content of the powder after natural drying is less than 5%.

6. The method for preparing a calcium-containing water-soluble compound fertilizer according to claim 4, characterized in that: In step 2, the dilute alkali solution is a sodium hydroxide solution.

7. The method for preparing a calcium-containing water-soluble compound fertilizer according to claim 4, wherein In step 2, by weight, the fucoidan extract is 50-60 parts, the polymethacrylate is 10-20 parts, and the polylactic acid aqueous emulsion is 20-30 parts.

8. The method for preparing a calcium-containing water-soluble compound fertilizer according to claim 4, characterized in that: In step 3, the pH adjuster is acetic acid and / or citric acid.

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