CN112299930A - High-concentration suspended calcium-magnesium fertilizer and preparation method thereof - Google Patents
High-concentration suspended calcium-magnesium fertilizer and preparation method thereof Download PDFInfo
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- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
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Abstract
The invention discloses a high-concentration suspended calcium-magnesium fertilizer and a preparation method thereof, belonging to the technical field of water-soluble fertilizers. According to the invention, the high-concentration calcium-magnesium water-soluble fertilizer is prepared through the chelation reaction of calcium and magnesium ions with animal protein polypeptide, small peptide and amino acid, so that the stability of the calcium-magnesium fertilizer is obviously improved, the problems of precipitation and layering caused by direct mixing are avoided, the water solubility of the product is good, the product is easy to be thoroughly absorbed by plants, and the product utilization rate is increased; meanwhile, calcium ions and magnesium ions simultaneously act on plants through the synchronous chelation reaction of the calcium ions and the magnesium ions, so that the synergistic interaction of the calcium ions and the magnesium ions is fully exerted, the acid soil can be obviously improved, the calcium deficiency symptom of crops can be prevented, the yield of economic crops can be improved, and the quality can be improved; the invention can be sprayed on the leaf surface and can also be used along with water, is simple and convenient, has high absorption and utilization rate and wide market prospect.
Description
Technical Field
The invention relates to a high-concentration suspended calcium magnesium fertilizer and a preparation method thereof, in particular to a high-concentration suspended calcium magnesium fertilizer which can obviously improve acid soil, prevent the calcium deficiency symptom of crops, improve the yield of economic crops and improve the quality and a preparation method thereof, belonging to the technical field of water-soluble fertilizers.
Background
In agricultural production, particularly in the production of economic crops, the fertilizers which are used by farmers mostly are macroelement and microelement fertilizers, and the macroelement nitrogen, phosphorus and potassium and the microelements zinc, iron, boron, manganese and the like are concerned mostly, but the secondary element calcium and magnesium are concerned little. The growth and development of crops need various nutrient elements, the nutrients have respective effects and cannot be mutually replaced, and if one element is lacked, the nutrient deficiency can occur, so that the normal growth and development of plants are influenced. The medium trace element fertilizer has low fertilizing amount and low crop content, so that the importance of the medium trace element fertilizer is often not enough in agricultural production, and the medium trace element fertilizer has certain influence on the healthy growth and production of crops.
Calcium is important for plant growth, and calcium deficiency inhibits the growth of the most vigorous apical buds or roots, particularly root hairs. Calcium is a component and an activator of some enzymes in the plant body, and has certain influence on the metabolism of nitrogen and carbohydrate; calcium has the functions of eliminating some organic acids in plants and reducing the toxicity of the organic acids to the plants; calcium is also beneficial to promoting the absorption of potassium ions by plants. Once plants are lack of calcium, the symptoms of calcium deficiency can be generated immediately, and various physiological diseases caused by calcium deficiency can be caused. Such as tomato and sweet pepper stem rot, celery heart rot, Chinese cabbage and cabbage heart rot, sweet potato bud rot, apple bitter pit, water heart, pear flesh stone cell hardening, uneven peel surface and the like, which are all caused by calcium deficiency of plants. Magnesium is a medium nutrient element required for normal growth and development of plants, is a main mineral element forming chlorophyll, directly influences photosynthesis of plants and synthesis of sugar and protein, and brings irreparable harm to plant growth due to the lack of magnesium. In recent years, secondary element water-soluble fertilizers taking calcium and magnesium as main components are more and more approved by users, and the calcium and magnesium fertilizers develop rapidly.
In the prior art, many reports of calcium magnesium fertilizers are reported, for example, patent 2018107697151 discloses a preparation method of an amino acid calcium magnesium suspension liquid water-soluble fertilizer, the product is subjected to double chelation by amino acid plant nutrient solution and ammonium polyphosphate, calcium and magnesium elements contained in the product are not easy to be regulated by soil and are easy to absorb, the nutrient utilization rate is improved, the calcium and magnesium elements are directionally supplemented, and the stress resistance and the photosynthetic capacity of crops are improved; patent 201910550727X discloses a calcium magnesium fertilizer and a preparation method thereof, wherein the calcium magnesium fertilizer comprises: 10.0-15.0% of chelated calcium, 2.0-10.0% of chelated magnesium, 1-4% of polypeptide and the balance of medium; and the mass percentage of the chelated calcium in the calcium-magnesium fertilizer is larger than the sum of the chelated magnesium and the polypeptide; patent 201810128383.9 discloses a water-soluble calcium magnesium fertilizer, which is prepared from the following raw materials in parts by weight: calcium-containing raw materials, magnesium-containing raw materials, organic fertilizer, absorption enhancer, trace elements and water; the calcium and magnesium elements in the fertilizer accord with the cooperative absorption of the calcium and magnesium elements in plant physiology and mutually promote the calcium and magnesium elements to exert effects, and in addition, the organic fertilizer, the absorption enhancer and the trace elements can promote the growth of crops and obviously improve the yield of the crops. Compared with the prior art, the research on the calcium-magnesium fertilizer mainly aims at improving the utilization rate of the calcium-magnesium fertilizer, improving the stability of the calcium-magnesium water-soluble fertilizer and promoting the production efficiency, but the research on the synergistic effect of the calcium fertilizer and the magnesium fertilizer by improving the preparation process of the calcium-magnesium fertilizer is less, so that the research becomes one of the technical bottlenecks in the application of the calcium-magnesium fertilizer.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to overcome the technical defects that the utilization rate of the calcium-magnesium fertilizer is low, the synergistic effect of the calcium fertilizer and the magnesium fertilizer needs to be further improved and the like at present, and the invention aims to provide the high-concentration suspended calcium-magnesium fertilizer and the preparation process thereof, so that the synergistic effect of the calcium fertilizer and the magnesium fertilizer is fully exerted, the utilization rate and the stability of the calcium-magnesium fertilizer are improved, the acid soil is obviously improved, the calcium deficiency symptom of crops is prevented, the yield of economic crops is improved, and the quality is improved.
The invention realizes the technical effects through the following technical scheme:
a high-concentration suspended calcium-magnesium fertilizer is characterized by being prepared by the following steps:
(1) preparing a calcium-magnesium solution: dissolving the selected calcium nitrate and magnesium nitrate in water, and stirring for 5-10 min to form a calcium-magnesium solution completely dissolved in water;
(2) preparing animal protease hydrolysate: adding purified water into the animal protein powder, blending into an aqueous solution with the mass concentration of 20-30%, fully and uniformly mixing until the aqueous solution is stirred without resistance, adjusting the pH of the system by using a sodium hydroxide solution, adding animal protein hydrolase, and carrying out enzymolysis at constant temperature to obtain an enzymolysis solution;
(3) carrying out chelation reaction: adding the animal protein enzymolysis liquid prepared in the step (2) into the calcium-magnesium solution prepared in the step (1), stirring and reacting for 3-4 hours, and keeping the pH of the system to be 3.5-4.5 in the reaction process;
(4) centrifugal separation: centrifuging and separating the product after the chelation reaction is finished to obtain a separation solution;
(5) and (2) carrying out a two-step chelation reaction: adjusting the pH value of the separated reaction liquid to be neutral, adjusting the temperature to be 60-80 ℃, continuously reacting for 1-2 hours under the stirring condition, and keeping the pH value of the reaction system to be 6.5-7 in the reaction process;
(6) blending: adding a stabilizer, magnesium aluminum silicate and a penetrating agent into the solution reacted in the step (5), and uniformly mixing;
(7) filtering and filling: and (4) cooling the mixed liquid obtained in the step (6), filtering, and filling to obtain the high-concentration suspended calcium-magnesium fertilizer.
Preferably, the mass ratio of the calcium nitrate, the magnesium nitrate and the tap water in the preparation of the calcium-magnesium solution in the step (1) is 60-80 parts, 8-15 parts and 40 parts.
Optimally, the mass ratio of the calcium nitrate, the magnesium nitrate and the tap water in the preparation of the calcium-magnesium solution in the step (1) is 75 parts, 15 parts and 40 parts.
Preferably, the animal protein powder in the step (2) is one or a mixture of two of animal blood powder and feather powder.
Preferably, the optimum pH value of the enzymolysis system in the step (2) is 5-6, the adding amount of the animal protein hydrolase is 1000-2000U/g of the substrate mass, the enzymolysis temperature is 40-50 ℃, and the enzymolysis time is 15-20 h.
Preferably, the animal proteolytic enzyme is one or a mixture of several of acid protease, papain and trypsin.
Preferably, the mass ratio of the calcium-magnesium solution to the animal protein enzymolysis solution in the step (3) is 3-5: 1.
Preferably, the solid insoluble material separated in step (4) can be reused for the animal proteolysis in step (2).
Preferably, the stabilizer in the step (6) is one or a mixture of two of xanthan gum, kaolin, sodium carboxymethyl cellulose, sodium alginate and wheat gluten, and the addition amount is 0.01-0.05%; the optimal quality is the mixture of sodium alginate and xanthan gum with the mass ratio of 3: 1.
Preferably, the addition amount of the magnesium aluminum silicate in the step (6) is 2-3%.
Preferably, the penetrating agent in the step (6) is one or a mixture of two of azone and organosilicon, and the addition amount is 0.01-0.03%.
The invention provides a high-concentration suspended calcium-magnesium fertilizer and a preparation method thereof, wherein CaO in the product is more than or equal to 500g/L, and MgO in the product is more than or equal to 80 g/L; the product standard meets the requirements of relevant national standards.
The invention provides a high-concentration suspended calcium-magnesium fertilizer, which has the following remarkable advantages compared with the prior art:
(1) according to the invention, the high-concentration calcium-magnesium water-soluble fertilizer is prepared through the chelation reaction of calcium and magnesium ions with animal protein polypeptide, small peptide and amino acid, so that the stability of the calcium-magnesium fertilizer is obviously improved, the problems of precipitation and layering caused by direct mixing are avoided, the water solubility of the product is good, the product is easy to be thoroughly absorbed by plants, and the product utilization rate is increased; simultaneously, calcium ions and magnesium ions simultaneously act on plants through the synchronous chelation reaction of the calcium ions and the magnesium ions, and the synergistic effect of the calcium ions and the magnesium ions is fully exerted;
(2) the invention utilizes the chelation reaction of animal protein polypeptide, small peptide and amino acid to stabilize the water soluble fertilizer, can obviously improve acid soil, prevent the symptom of calcium deficiency of crops, improve the yield of economic crops and improve the quality;
(3) the method adopts meat processing byproducts as raw materials, utilizes protease to carry out enzymolysis on the raw materials, the main components of the obtained enzymolysis liquid are small peptides, oligopeptides and a small part of amino acids which can be directly absorbed and utilized by animals, and the calcium-magnesium water-soluble fertilizer obtained by chelating reaction of the enzymolysis liquid and calcium and magnesium ions realizes resource recycling of meat processing wastes;
(4) the invention can be sprayed on the leaf surface and can also be used along with water, is simple and convenient, has high absorption and utilization rate, and reduces the waste of resources and the environmental pollution; the calcium supplement agent has the advantages that the symptom caused by the deficiency of calcium mould elements of economic crops, horticultural crops and the like at present is greatly relieved, the calcium and magnesium elements are supplemented to a certain degree, the later-period deficiency is prevented, and the market prospect is wide.
Detailed Description
Example 1
A high-concentration suspended calcium-magnesium fertilizer is prepared by the following steps:
(1) preparing a calcium-magnesium solution: dissolving the selected calcium nitrate and magnesium nitrate in water, and stirring for 5-10 min to form a calcium-magnesium solution completely dissolved in water; wherein the mass ratio of calcium nitrate, magnesium nitrate and tap water in the preparation of the calcium-magnesium solution in the step (1) is 75 parts, 15 parts and 40 parts;
(2) preparing animal protease hydrolysate: adding purified water into the animal protein powder, blending into an aqueous solution with the mass concentration of 20-30%, fully and uniformly mixing until the aqueous solution is stirred without resistance, adjusting the pH of the system by using a sodium hydroxide solution, adding animal protein hydrolase, and carrying out enzymolysis at constant temperature to obtain an enzymolysis solution; the animal protein powder is animal blood powder, the optimum pH value of the enzymolysis system is 5-6, the addition amount of animal protein hydrolase is 1000-2000U/g of substrate mass, the enzymolysis temperature is 40-50 ℃, and the enzymolysis time is 15-20 h;
(3) carrying out chelation reaction: adding the animal protein enzymolysis liquid prepared in the step (2) into the calcium-magnesium solution prepared in the step (1), wherein the mass ratio of the calcium-magnesium solution to the animal protein enzymolysis liquid is 3: 1; stirring and reacting for 3-4 hours, and keeping the pH of the system to be 3.5-4.5 in the reaction process;
(4) centrifugal separation: centrifuging and separating the product after the chelation reaction is finished to obtain a separation solution;
(5) and (2) carrying out a two-step chelation reaction: adjusting the pH value of the separated reaction liquid to be neutral, adjusting the temperature to be 60-80 ℃, continuously reacting for 1-2 hours under the stirring condition, and keeping the pH value of the reaction system to be 6.5-7 in the reaction process;
(6) blending: adding a stabilizer, magnesium aluminum silicate and a penetrating agent into the solution reacted in the step (5), and uniformly mixing; the stabilizer is a mixture of sodium alginate and xanthan gum with the mass ratio of 3:1, and the addition amount is 0.05%; the addition amount of the magnesium aluminum silicate is 3 percent; the penetrating agent is organic silicon, and the addition amount is 0.01%;
(7) filtering and filling: and (4) cooling the mixed liquid obtained in the step (6), filtering, and filling to obtain the high-concentration suspended calcium-magnesium fertilizer.
Example 2
A high-concentration suspended calcium-magnesium fertilizer is prepared by the following steps:
(1) preparing a calcium-magnesium solution: dissolving the selected calcium nitrate and magnesium nitrate in water, and stirring for 5-10 min to form a calcium-magnesium solution completely dissolved in water; wherein the mass ratio of calcium nitrate, magnesium nitrate and tap water in the preparation of the calcium-magnesium solution is 75 parts, 15 parts and 40 parts;
(2) preparing animal protease hydrolysate: adding purified water into the animal protein powder, blending into an aqueous solution with the mass concentration of 20-30%, fully and uniformly mixing until the aqueous solution is stirred without resistance, adjusting the pH of the system by using a sodium hydroxide solution, adding animal protein hydrolase, and carrying out enzymolysis at constant temperature to obtain an enzymolysis solution; the animal protein powder is animal blood powder, the optimum pH value of the enzymolysis system is 5-6, the addition amount of animal protein hydrolase is 1000-2000U/g of substrate mass, the enzymolysis temperature is 40-50 ℃, and the enzymolysis time is 15-20 h;
(3) carrying out chelation reaction: adding the animal protein enzymolysis liquid prepared in the step (2) into the calcium-magnesium solution prepared in the step (1), wherein the mass ratio of the calcium-magnesium solution to the animal protein enzymolysis liquid is 4: 1; stirring and reacting for 3-4 hours, and keeping the pH of the system to be 3.5-4.5 in the reaction process;
(4) centrifugal separation: centrifuging and separating the product after the chelation reaction is finished to obtain a separation solution;
(5) and (2) carrying out a two-step chelation reaction: adjusting the pH value of the separated reaction liquid to be neutral, adjusting the temperature to be 60-80 ℃, continuously reacting for 1-2 hours under the stirring condition, and keeping the pH value of the reaction system to be 6.5-7 in the reaction process;
(6) blending: adding a stabilizer, magnesium aluminum silicate and a penetrating agent into the solution reacted in the step (5), and uniformly mixing; the stabilizer is a mixture of sodium alginate and xanthan gum with the mass ratio of 3:1, and the addition amount is 0.05%; the addition amount of the magnesium aluminum silicate is 3 percent; the penetrating agent is organic silicon, and the addition amount is 0.01%;
(7) filtering and filling: and (4) cooling the mixed liquid obtained in the step (6), filtering, and filling to obtain the high-concentration suspended calcium-magnesium fertilizer.
Example 3
A high-concentration suspended calcium-magnesium fertilizer is prepared by the following steps:
(1) preparing a calcium-magnesium solution: dissolving the selected calcium nitrate and magnesium nitrate in water, and stirring for 5-10 min to form a calcium-magnesium solution completely dissolved in water; wherein the mass ratio of calcium nitrate, magnesium nitrate and tap water in the preparation of the calcium-magnesium solution is 75 parts, 15 parts and 40 parts;
(2) preparing animal protease hydrolysate: adding purified water into the animal protein powder, blending into an aqueous solution with the mass concentration of 20-30%, fully and uniformly mixing until the aqueous solution is stirred without resistance, adjusting the pH of the system by using a sodium hydroxide solution, adding animal protein hydrolase, and carrying out enzymolysis at constant temperature to obtain an enzymolysis solution; the animal protein powder is animal blood powder, the optimum pH value of the enzymolysis system is 5-6, the addition amount of animal protein hydrolase is 1000-2000U/g of substrate mass, the enzymolysis temperature is 40-50 ℃, and the enzymolysis time is 15-20 h;
(3) carrying out chelation reaction: adding the animal protein enzymolysis liquid prepared in the step (2) into the calcium-magnesium solution prepared in the step (1), wherein the mass ratio of the calcium-magnesium solution to the animal protein enzymolysis liquid is 5: 1; stirring and reacting for 3-4 hours, and keeping the pH of the system to be 3.5-4.5 in the reaction process;
(4) centrifugal separation: centrifuging and separating the product after the chelation reaction is finished to obtain a separation solution;
(5) and (2) carrying out a two-step chelation reaction: adjusting the pH value of the separated reaction liquid to be neutral, adjusting the temperature to be 60-80 ℃, continuously reacting for 1-2 hours under the stirring condition, and keeping the pH value of the reaction system to be 6.5-7 in the reaction process;
(6) blending: adding a stabilizer, magnesium aluminum silicate and a penetrating agent into the solution reacted in the step (5), and uniformly mixing; the stabilizer is a mixture of sodium alginate and xanthan gum with the mass ratio of 3:1, and the addition amount is 0.05%; the addition amount of the magnesium aluminum silicate is 3 percent; the penetrating agent is organic silicon, and the addition amount is 0.01%;
(7) filtering and filling: and (4) cooling the mixed liquid obtained in the step (6), filtering, and filling to obtain the high-concentration suspended calcium-magnesium fertilizer.
Example 4
A high-concentration suspended calcium-magnesium fertilizer is prepared by the following steps:
(1) preparing a calcium-magnesium solution: dissolving the selected calcium nitrate and magnesium nitrate in water, and stirring for 5-10 min to form a calcium-magnesium solution completely dissolved in water; wherein the mass ratio of calcium nitrate, magnesium nitrate and tap water in the preparation of the calcium-magnesium solution is 75 parts, 15 parts and 40 parts;
(2) preparing animal protease hydrolysate: adding purified water into the animal protein powder, blending into an aqueous solution with the mass concentration of 20-30%, fully and uniformly mixing until the aqueous solution is stirred without resistance, adjusting the pH of the system by using a sodium hydroxide solution, adding animal protein hydrolase, and carrying out enzymolysis at constant temperature to obtain an enzymolysis solution; the animal protein powder is feather powder, the optimum pH value of an enzymolysis system is 5-6, the addition amount of animal protein hydrolase is 1000-2000U/g of substrate mass, the enzymolysis temperature is 40-50 ℃, and the enzymolysis time is 15-20 h;
(3) carrying out chelation reaction: adding the animal protein enzymolysis liquid prepared in the step (2) into the calcium-magnesium solution prepared in the step (1), wherein the mass ratio of the calcium-magnesium solution to the animal protein enzymolysis liquid is 3: 1; stirring and reacting for 3-4 hours, and keeping the pH of the system to be 3.5-4.5 in the reaction process;
(4) centrifugal separation: centrifuging and separating the product after the chelation reaction is finished to obtain a separation solution;
(5) and (2) carrying out a two-step chelation reaction: adjusting the pH value of the separated reaction liquid to be neutral, adjusting the temperature to be 60-80 ℃, continuously reacting for 1-2 hours under the stirring condition, and keeping the pH value of the reaction system to be 6.5-7 in the reaction process;
(6) blending: adding a stabilizer, magnesium aluminum silicate and a penetrating agent into the solution reacted in the step (5), and uniformly mixing; the stabilizer is a mixture of sodium alginate and xanthan gum with the mass ratio of 3:1, and the addition amount is 0.05%; the addition amount of the magnesium aluminum silicate is 3 percent; the penetrating agent is organic silicon, and the addition amount is 0.01%;
(7) filtering and filling: and (4) cooling the mixed liquid obtained in the step (6), filtering, and filling to obtain the high-concentration suspended calcium-magnesium fertilizer.
Example 5
A high-concentration suspended calcium-magnesium fertilizer is prepared by the following steps:
(1) preparing a calcium-magnesium solution: dissolving the selected calcium nitrate and magnesium nitrate in water, and stirring for 5-10 min to form a calcium-magnesium solution completely dissolved in water; wherein the mass ratio of calcium nitrate, magnesium nitrate and tap water in the preparation of the calcium-magnesium solution is 75 parts, 15 parts and 40 parts;
(2) preparing animal protease hydrolysate: adding purified water into the animal protein powder, blending into an aqueous solution with the mass concentration of 20-30%, fully and uniformly mixing until the aqueous solution is stirred without resistance, adjusting the pH of the system by using a sodium hydroxide solution, adding animal protein hydrolase, and carrying out enzymolysis at constant temperature to obtain an enzymolysis solution; the animal protein powder is feather powder, the optimum pH value of an enzymolysis system is 5-6, the addition amount of animal protein hydrolase is 1000-2000U/g of substrate mass, the enzymolysis temperature is 40-50 ℃, and the enzymolysis time is 15-20 h;
(3) carrying out chelation reaction: adding the animal protein enzymolysis liquid prepared in the step (2) into the calcium-magnesium solution prepared in the step (1), wherein the mass ratio of the calcium-magnesium solution to the animal protein enzymolysis liquid is 4: 1; stirring and reacting for 3-4 hours, and keeping the pH of the system to be 3.5-4.5 in the reaction process;
(4) centrifugal separation: centrifuging and separating the product after the chelation reaction is finished to obtain a separation solution;
(5) and (2) carrying out a two-step chelation reaction: adjusting the pH value of the separated reaction liquid to be neutral, adjusting the temperature to be 60-80 ℃, continuously reacting for 1-2 hours under the stirring condition, and keeping the pH value of the reaction system to be 6.5-7 in the reaction process;
(6) blending: adding a stabilizer, magnesium aluminum silicate and a penetrating agent into the solution reacted in the step (5), and uniformly mixing; the stabilizer is a mixture of sodium alginate and xanthan gum with the mass ratio of 3:1, and the addition amount is 0.05%; the addition amount of the magnesium aluminum silicate is 3 percent; the penetrating agent is organic silicon, and the addition amount is 0.01%;
(7) filtering and filling: and (4) cooling the mixed liquid obtained in the step (6), filtering, and filling to obtain the high-concentration suspended calcium-magnesium fertilizer.
Example 6
A high-concentration suspended calcium-magnesium fertilizer is prepared by the following steps:
(1) preparing a calcium-magnesium solution: dissolving the selected calcium nitrate and magnesium nitrate in water, and stirring for 5-10 min to form a calcium-magnesium solution completely dissolved in water; wherein the mass ratio of calcium nitrate, magnesium nitrate and tap water in the preparation of the calcium-magnesium solution is 75 parts, 15 parts and 40 parts;
(2) preparing animal protease hydrolysate: adding purified water into the animal protein powder, blending into an aqueous solution with the mass concentration of 20-30%, fully and uniformly mixing until the aqueous solution is stirred without resistance, adjusting the pH of the system by using a sodium hydroxide solution, adding animal protein hydrolase, and carrying out enzymolysis at constant temperature to obtain an enzymolysis solution; the animal protein powder is feather powder, the optimum pH value of an enzymolysis system is 5-6, the addition amount of animal protein hydrolase is 1000-2000U/g of substrate mass, the enzymolysis temperature is 40-50 ℃, and the enzymolysis time is 15-20 h;
(3) carrying out chelation reaction: adding the animal protein enzymolysis liquid prepared in the step (2) into the calcium-magnesium solution prepared in the step (1), wherein the mass ratio of the calcium-magnesium solution to the animal protein enzymolysis liquid is 5: 1; stirring and reacting for 3-4 hours, and keeping the pH of the system to be 3.5-4.5 in the reaction process;
(4) centrifugal separation: centrifuging and separating the product after the chelation reaction is finished to obtain a separation solution;
(5) and (2) carrying out a two-step chelation reaction: adjusting the pH value of the separated reaction liquid to be neutral, adjusting the temperature to be 60-80 ℃, continuously reacting for 1-2 hours under the stirring condition, and keeping the pH value of the reaction system to be 6.5-7 in the reaction process;
(6) blending: adding a stabilizer, magnesium aluminum silicate and a penetrating agent into the solution reacted in the step (5), and uniformly mixing; the stabilizer is a mixture of sodium alginate and xanthan gum with the mass ratio of 3:1, and the addition amount is 0.05%; the addition amount of the magnesium aluminum silicate is 3 percent; the penetrating agent is organic silicon, and the addition amount is 0.01%;
(7) filtering and filling: and (4) cooling the mixed liquid obtained in the step (6), filtering, and filling to obtain the high-concentration suspended calcium-magnesium fertilizer.
Example 7 comparison of the Effect of different high concentrations of suspended calcium magnesium fertilizers on tomato planting
1. Test method
The test was designed as a randomized block test, with a total of 10 treatments and 3 replicates. Each test plot is 7.2m long, 1.5m wide, the ridge width is 90cm, the furrow width is 60cm, the ridge height is 20cm, the plant spacing is 50cm, the cultivation is carried out by adopting a one-ridge double-row high-ridge and under-film drip irrigation mode, 30 tomatoes are planted in each plot, the furrow is dug to be 80cm deep in each plot, and 0.8mm of agricultural film is buried for isolation and lateral seepage prevention;
treating with uniform water and fertilizer at seedling stage, selecting plants with uniform growth for field planting, irrigating with large water once after field planting to ensure sufficient bottom water for each treatment, managing according to tomato planting rules, and topdressing N, P each time for different treatments2O5、K2The content of O is kept consistent;
the calcium-magnesium water-soluble fertilizer is used as an additional fertilizer, is applied in the seedling growth period, the flowering and fruit setting period and the fruiting and full period in equal amount respectively, and is subjected to the same field management in other fields.
2. Test grouping
The test total comprises 10 groups, namely a blank control group (without applying calcium-magnesium water-soluble fertilizer), experimental groups of examples 1-6 (applying the calcium-magnesium fertilizer described in examples 1-6), a group of control example 1 (the calcium fertilizer is prepared by the same process as example 2), a group of control example 2 (the magnesium fertilizer is prepared by the same process as example 2), and a group of control example 3 (the calcium fertilizer and the magnesium fertilizer are respectively prepared and then mixed, and the preparation process and the calcium-magnesium content are the same as example 2); the application amount of calcium ions and magnesium ions is the same;
3. measurement index
The indexes of the tomato such as single fruit weight, yield, tomato Vc content, soluble sugar and the like are measured, and the influence of calcium magnesium fertilizer on the disease resistance of the tomato downy mildew is measured, wherein the influence of the calcium magnesium fertilizer on the disease resistance of the tomato downy mildew is measured according to the application of the Shenfang research on the influence of different calcium and magnesium fertilizer treatments on the growth yield and quality of the tomato;
4. test results
TABLE 1 Effect of different high-concentration suspended Ca-Mg fertilizers on tomato planting
The experimental results show that the products of the embodiment of the invention can better promote the yield increase of tomatoes, improve the fruit quality of the tomatoes and improve the disease resistance of the tomatoes, wherein the embodiment 2 is the best embodiment of the invention; meanwhile, the experimental result shows that the selection of animal protein and the preparation process of the calcium-magnesium fertilizer have obvious influence on the action effect of the calcium-magnesium water-soluble fertilizer.
The above embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; such modifications and substitutions do not depart from the spirit and scope of the present invention as set forth in the appended claims.
Claims (10)
1. A high-concentration suspended calcium-magnesium fertilizer is characterized by being prepared by the following steps:
(1) preparing a calcium-magnesium solution: dissolving the selected calcium nitrate and magnesium nitrate in water, and stirring for 5-10 min to form a calcium-magnesium solution completely dissolved in water;
(2) preparing animal protease hydrolysate: adding purified water into the animal protein powder, blending into an aqueous solution with the mass concentration of 20-30%, fully and uniformly mixing until the aqueous solution is stirred without resistance, adjusting the pH of the system by using a sodium hydroxide solution, adding animal protein hydrolase, and carrying out enzymolysis at constant temperature to obtain an enzymolysis solution;
(3) carrying out chelation reaction: adding the animal protein enzymolysis liquid prepared in the step (2) into the calcium-magnesium solution prepared in the step (1), stirring and reacting for 3-4 hours, and keeping the pH of the system to be 3.5-4.5 in the reaction process;
(4) centrifugal separation: centrifuging and separating the product after the chelation reaction is finished to obtain a separation solution;
(5) and (2) carrying out a two-step chelation reaction: adjusting the pH value of the separated reaction liquid to be neutral, adjusting the temperature to be 60-80 ℃, continuously reacting for 1-2 hours under the stirring condition, and keeping the pH value of the reaction system to be 6.5-7 in the reaction process;
(6) blending: adding a stabilizer, magnesium aluminum silicate and a penetrating agent into the solution reacted in the step (5), and uniformly mixing;
(7) filtering and filling: and (4) cooling the mixed liquid obtained in the step (6), filtering, and filling to obtain the high-concentration suspended calcium-magnesium fertilizer.
2. The high-concentration suspended calcium-magnesium fertilizer according to claim 1, wherein the mass ratio of calcium nitrate, magnesium nitrate and tap water in the preparation of the calcium-magnesium solution in the step (1) is 60-80 parts, 8-15 parts and 40 parts.
3. The high-concentration suspended calcium-magnesium fertilizer according to claim 1, wherein the mass ratio of calcium nitrate, magnesium nitrate and tap water in the preparation of the calcium-magnesium solution in step (1) is 75 parts, 15 parts and 40 parts.
4. The high-concentration suspended calcium-magnesium fertilizer as claimed in claim 1, wherein the animal protein powder in step (2) is one or a mixture of animal blood powder and feather powder.
5. The high-concentration suspended calcium-magnesium fertilizer according to claim 1, characterized in that the optimum pH of the enzymolysis system in the step (2) is 5-6, the addition amount of animal proteolytic enzyme is 1000-2000U/g of substrate mass, the enzymolysis temperature is 40-50 ℃, and the enzymolysis time is 15-20 h.
6. The high-concentration suspended calcium-magnesium fertilizer as claimed in claim 1, wherein the animal proteolytic enzyme is one or more of acid protease, papain and trypsin.
7. The high-concentration suspended calcium-magnesium fertilizer according to claim 1, wherein the mass ratio of the calcium-magnesium solution to the animal protein enzymolysis solution in the step (3) is 3-5: 1.
8. The high-concentration suspended calcium-magnesium fertilizer according to claim 1, wherein the stabilizer in step (6) is one or a mixture of two of xanthan gum, kaolin, sodium carboxymethyl cellulose, sodium alginate and wheat gluten, and the addition amount is 0.01-0.05%; the optimal quality is the mixture of sodium alginate and xanthan gum with the mass ratio of 3: 1.
9. The high-concentration suspended calcium-magnesium fertilizer as claimed in claim 1, wherein the addition amount of magnesium aluminum silicate in step (6) is 2-3%.
10. The high-concentration suspended calcium-magnesium fertilizer according to claim 1, wherein the penetrant in the step (6) is one or a mixture of two of azone and organosilicon, and the addition amount is 0.01-0.03%.
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