Organic-inorganic compound fertilizer for torreya grandis, preparation method and device

Abstract

The present application relates to a kind of organic-inorganic compound fertilizer for torreya grandis, preparation method and device, belong to fertilizer technical field.The present application is creatively prepared according to the cultivation condition of torreya grandis and has controlled release, slow-release organic-inorganic compound fertilizer, the present application is loaded with hydrogel to urea, realizes that urea can be controlled release to the change of temperature and pH, with controlled release, on the other hand, with oligomeric ammonium polyphosphate as the main source of phosphorus element, it has higher nutrient content than traditional phosphorus fertilizer, after being applied to soil, it can slowly degrade into orthophosphate and be absorbed and utilized by torreya grandis, with slow-release, so that the fertilizer formed after the mixture of the two and other components is very suitable for the planting of torreya grandis, nutrient use efficiency is high after being applied to soil, can accelerate the growth and development of torreya grandis well, shorten the time of fruiting, promote the fruit setting rate, improve the yield of torreya grandis.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of fertilizers, and particularly relates to an organic-inorganic compound fertilizer for torreya grandis, a preparation method and device. BACKGROUND

[0002] Torreya grandis is a unique tree species in China, mainly growing in the relatively humid areas in southern China, and its fruits have very high nutritional value and can be processed into dried fruits as food, and also are a kind of precious Chinese medicinal materials, which have the efficacy of relieving inflammation and moistening the lungs after being taken as medicine.

[0003] However, the growth rate of torreya grandis is very slow, and it usually takes about 50 years to produce a large amount of fruits, which seriously limits its application. Even if the grafting technology is used, it still takes about 10 years to bear fruit, and the production benefit is not high. Therefore, in actual agricultural production, in order to further shorten the cultivation time of torreya grandis, people will also plant it by applying appropriate fertilizers and selecting suitable growth environment. However, the actual application effect of the existing fertilizer is general, and after being applied to the soil, many nutrients are lost through leaching, volatilization, fixation and other ways before being absorbed, and the utilization rate is low, which cannot accelerate the growth and development of torreya grandis, shorten the fruiting time, promote the fruit setting rate and improve the yield.

[0004] Therefore, the current fertilizer still has many defects when used for torreya grandis planting, and needs to be improved urgently. SUMMARY

[0005] In view of the problems in the prior art, the purpose of the present application is to provide an organic-inorganic compound fertilizer for torreya grandis, a preparation method and device. The present application creatively prepares an organic-inorganic compound fertilizer with controlled release and slow release according to the cultivation conditions of torreya grandis. On the one hand, the present application uses hydrogel to load urea, so that the urea can be released controllably according to the changes of temperature and pH, and has controlled release. On the other hand, the present application uses oligomeric ammonium polyphosphate as the main source of phosphorus element, which has higher nutrient content than traditional phosphorus fertilizer. After being applied to the soil, it can slowly degrade into orthophosphate and be absorbed and utilized by torreya grandis, and has slow release. Therefore, the fertilizer formed by mixing the two with other components is very suitable for the planting of torreya grandis, has high nutrient utilization rate after being applied to the soil, can accelerate the growth and development of torreya grandis, shorten the fruiting time, promote the fruit setting rate and improve the yield of torreya grandis.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] The organic-inorganic compound fertilizer for torreya grandis is prepared from 50-60 parts by weight of hydrogel loaded urea, 40-50 parts by weight of polyphosphate, 40-50 parts by weight of potassium chloride, 5-8 parts by weight of shell powder, 5-8 parts by weight of wood ash, 5-10 parts by weight of humic acid, 1-2 parts by weight of trace elements, 5-10 parts by weight of straw, 3-5 parts by weight of grass carbon, 5-8 parts by weight of loess and 30-35 parts by weight of deionized water.

[0008] As a preferred technical scheme of the present application, the hydrogel loaded urea is prepared by the following steps:

[0009] Step a: 8-10 parts by weight of polyvinyl alcohol and 20-25 parts by weight of N-isopropyl acrylamide are dissolved in 35-40 parts by weight of deionized water, stirred for 5-10 min and mixed to obtain solution a;

[0010] Step b: 0.3-0.5 parts by weight of crosslinking agent and 0.4-0.5 parts by weight of tert-butyl hydroperoxide are added to solution a, stirred for 5-10 min and mixed, then the stirring is stopped, and the reaction is carried out at 30-40°C in a nitrogen atmosphere for 20-24 h to obtain material a;

[0011] Step c: material a is placed in a dialysis bag, then completely immersed in deionized water for 2 h, during which the deionized water is replaced every 30 min, and after the immersion is completed, drying is carried out at 50°C until the constant weight is obtained to obtain hydrogel;

[0012] Step d: 70-80 parts by weight of deionized water and 60-70 parts by weight of urea are added to the hydrogel, stirred for 15-20 min and mixed, then left to stand for 3-4 h to obtain solution b;

[0013] Step e: 8-10 parts by weight of polyacrylamide is added to solution b, then stirred for 20-30 min under ultrasonic, and finally dried at 50°C until the constant weight is obtained, and then crushed to complete the preparation.

[0014] Further, the crosslinking agent in step b is N,N-methylene bisacrylamide.

[0015] Further, the power of the ultrasonic in step e is 500-600 W.

[0016] Further, the particle size of the crushing in step e is 10-15 mm.

[0017] As a preferred technical scheme of the present application, the polyphosphate is oligomeric ammonium polyphosphate.

[0018] As a preferred technical scheme of the present application, the trace elements are mixed by 3-5 parts by weight of magnesium sulfate, 3-4 parts by weight of zinc sulfate, 1-3 parts by weight of manganese sulfate, 1-3 parts by weight of copper sulfate, 2-3 parts by weight of ammonium molybdate and 3-5 parts by weight of ferrous sulfate.

[0019] As a preferred technical scheme of the present application, the straw is at least one of rice straw, corn straw and wheat straw; the particle size of the straw is 8-10 mm.

[0020] A preparation method of the organic-inorganic compound fertilizer for torreya grandis, the preparation method comprising the following steps:

[0021] (1) adding deionized water, polyphosphate and trace elements into a stirred tank, stirring for 10-15 min, and then sequentially adding loess, potassium chloride, shell powder, wood ash, humic acid, straw and grass carbon into the stirred tank, continuing to stir for 15-20 min to obtain component A;

[0022] (2) starting a granulator, pumping the component A into the granulator to perform extrusion granulation, controlling the particle size of the extrusion granulation to be 6-8 mm to obtain component B;

[0023] (3) starting a mixing tank, pumping the component B into the mixing tank, simultaneously adding hydrogel loaded urea into the mixing tank, stirring for 5-10 min to mix, and the preparation is completed.

[0024] A device for preparing the organic-inorganic compound fertilizer for torreya grandis, the device comprising a stirred tank, a granulator and a mixing tank; the top of the stirred tank is provided with a first feeding port; the top of the mixing tank is provided with a second feeding port; the lower part of the mixing tank is provided with a discharging port; the lower part of the stirred tank and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0025] The present application has the following beneficial effects:

[0026] (1) The present application creatively prepares the organic-inorganic compound fertilizer with controlled release and slow release according to the cultivation conditions of torreya grandis, on one hand, the present application loads urea by using hydrogel to realize the controlled release of urea to the changes of temperature and pH, and has the controlled release, on the other hand, the present application uses oligomeric ammonium polyphosphate as the main source of phosphorus element, which has higher nutrient content than the traditional phosphorus fertilizer, can slowly degrade into orthophosphate after being applied into the soil and be absorbed and utilized by torreya grandis, has the slow release, so that the fertilizer formed by mixing the two and other components is very suitable for the planting of torreya grandis, has high nutrient utilization rate after being applied into the soil, can accelerate the growth and development of torreya grandis, shorten the fruiting time, promote the fruit setting rate and improve the yield of torreya grandis.

[0027] (2)The application creatively utilizes polyvinyl alcohol and N-isopropyl acrylamide to prepare a hydrogel by crosslinking, and then loads urea to form a hydrogel loaded urea, which can change the interaction with urea by the network structure of the hydrogel shrinking or expanding according to the temperature and pH of the soil after being applied to the soil, so as to realize the controlled release of urea, greatly improve the utilization rate of urea by torreya grandis, and promote the yield of torreya grandis. Meanwhile, the high water absorption of the hydrogel itself makes it more suitable for the planting of torreya grandis, which can continuously maintain the soil moisture after irrigation and promote the growth of torreya grandis. In addition, during the preparation of the hydrogel loaded urea, polyacrylamide is also added to further interpenetrate the network structure of the hydrogel, forming a multi-network interpenetrating structure, which not only improves the overall mechanical strength and stability of the final hydrogel loaded urea, but more importantly, can enhance the response sensitivity to pH, and achieve better release in the suitable pH for planting torreya grandis, thereby promoting the yield of torreya grandis.

[0028] (3)In the method for preparing the organic-inorganic compound fertilizer, oligomeric ammonium polyphosphate is used to complex trace elements to form an ammonium polyphosphate complex. After complexing, not only can the activity of trace elements be improved, the absorption and utilization during the planting of torreya grandis can be promoted, and the yield can be improved, but also the coordination reaction that may occur when trace elements coexist with the hydrogel loaded urea can be avoided, thereby reducing the adverse effects on the controlled release. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined object, the specific embodiments, structures, features and effects according to the present application are described in detail as follows in combination with examples.

[0030] Example 1

[0031] An organic-inorganic compound fertilizer for torreya grandis is prepared from 50 parts by weight of a hydrogel loaded urea, 40 parts by weight of a polyphosphate, 40 parts by weight of potassium chloride, 5 parts by weight of shell powder, 5 parts by weight of wood ash, 5 parts by weight of humic acid, 1 part by weight of trace elements, 5 parts by weight of straw, 3 parts by weight of grass charcoal, 5 parts by weight of loess, and 30 parts by weight of deionized water.

[0032] The hydrogel loaded urea is prepared by the following steps:

[0033] Step a: 8 parts by weight of polyvinyl alcohol and 20 parts by weight of N-isopropyl acrylamide are dissolved in 35 parts by weight of deionized water, stirred for 5 min, and mixed to obtain solution a;

[0034] Step b: 0.3 parts by weight of a crosslinking agent and 0.4 parts by weight of t-butyl hydroperoxide are added to solution a, mixed by stirring for 5 min, then stirring is stopped, and the reaction is carried out in a nitrogen atmosphere at 30℃ for 20 h to obtain material a;

[0035] Step c: material a is placed in a dialysis bag, then completely immersed in deionized water for 2 h, during which the deionized water is replaced every 30 min, and after the immersion is completed, drying is carried out at 50℃ until the weight is constant to obtain a hydrogel;

[0036] Step d: 70 parts by weight of deionized water and 60 parts by weight of urea are added to the hydrogel, mixed by stirring for 15 min, then left to stand for 3 h to obtain solution b;

[0037] Step e: 8 parts by weight of polyacrylamide is added to solution b, then mixed by stirring under ultrasonic for 20 min, and finally dried at 50℃ until the weight is constant, and then pulverized to complete the preparation.

[0038] The crosslinking agent in step b is N, N-methylene bisacrylamide.

[0039] The power of the ultrasonic in step e is 500 W.

[0040] The particle size of the pulverization in step e is 10 mm.

[0041] The polyphosphate is oligomeric ammonium polyphosphate with an average degree of polymerization of 10.

[0042] The trace elements are mixed from 3 parts by weight of magnesium sulfate, 3 parts by weight of zinc sulfate, 1 part by weight of manganese sulfate, 1 part by weight of copper sulfate, 2 parts by weight of ammonium molybdate, and 3 parts by weight of ferrous sulfate.

[0043] The straws are rice straw, corn straw, and wheat straw, with a mass ratio of 1:1:1; the particle size of the straws is 8 mm.

[0044] A preparation method of an organic-inorganic compound fertilizer for torreya grandis, the preparation method comprising the following steps:

[0045] (1) deionized water, polyphosphate, and trace elements are added to a stirred tank, stirred for 10 min, and then yellow soil, potassium chloride, shell powder, wood ash, humic acid, straw, and grass charcoal are sequentially added, and stirring is continued for 15 min to obtain component A;

[0046] (2) a granulator is started, component A is pumped into the granulator for extrusion granulation, and the particle size of the extrusion granulation is controlled at 6 mm to obtain component B;

[0047] (3) Start the mixing tank, pump component B into the mixing tank, at the same time, add the hydrogel loaded urea into the mixing tank, stir for 5 min, and the preparation is completed.

[0048] A device for preparing organic-inorganic compound fertilizer for torreya grandis, the device comprising a stirring tank, a granulator and a mixing tank; the top of the stirring tank is provided with a first inlet; the top of the mixing tank is provided with a second inlet; the lower part of the mixing tank is provided with an outlet; the lower part of the stirring tank and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0049] Example 2

[0050] An organic-inorganic compound fertilizer for torreya grandis, which is prepared from 60 parts by weight of hydrogel loaded urea, 50 parts by weight of polyphosphate, 50 parts by weight of potassium chloride, 8 parts by weight of shell powder, 8 parts by weight of wood ash, 10 parts by weight of humic acid, 2 parts by weight of trace elements, 10 parts by weight of straw, 5 parts by weight of grass carbon, 8 parts by weight of loess and 35 parts by weight of deionized water.

[0051] The hydrogel loaded urea is prepared by the following steps:

[0052] Step a: 10 parts by weight of polyvinyl alcohol and 25 parts by weight of N-isopropyl acrylamide are dissolved in 40 parts by weight of deionized water, stirred for 10 min, and a solution a is obtained;

[0053] Step b: 0.5 parts by weight of crosslinking agent and 0.5 parts by weight of tert-butyl hydroperoxide are added to the solution a, stirred for 10 min, then the stirring is stopped, and the reaction is carried out at 40℃ in a nitrogen atmosphere for 24h, and a material a is obtained;

[0054] Step c: the material a is placed in a dialysis bag, then completely immersed in deionized water for 2h, during which the deionized water is replaced every 30 min, after the immersion is completed, drying is carried out at 50℃ until the constant weight, and a hydrogel is obtained;

[0055] Step d: 80 parts by weight of deionized water and 70 parts by weight of urea are added to the hydrogel, stirred for 20 min, and then left for 4h, and a solution b is obtained;

[0056] Step e: 10 parts by weight of polyacrylamide is added to the solution b, then stirred for 30 min under ultrasonic, and finally dried at 50℃ until the constant weight, and the preparation is completed.

[0057] The crosslinking agent in step b is N, N-methylene bisacrylamide.

[0058] The power of the ultrasonic in step e is 600 W.

[0059] The particle size of the pulverization in step e is 15 mm.

[0060] The polyphosphate is oligomeric ammonium polyphosphate with an average degree of polymerization of 10.

[0061] The microelement is mixed by 5 parts of magnesium sulfate, 4 parts of zinc sulfate, 3 parts of manganese sulfate, 3 parts of copper sulfate, 3 parts of ammonium molybdate and 5 parts of ferrous sulfate.

[0062] The straw is rice straw, corn straw and wheat straw, and the mass ratio is 1:1:1; the particle size of the straw is 10 mm.

[0063] A preparation method of an organic-inorganic compound fertilizer for torreya grandis, the preparation method comprising the following steps:

[0064] (1) adding deionized water, polyphosphate and microelement into a stirred tank, stirring for 15 min, and then sequentially adding loess, potassium chloride, shell powder, wood ash, humic acid, straw and grass carbon into the stirred tank, continuing to stir for 20 min to obtain component A;

[0065] (2) starting a granulator, pumping the component A into the granulator to perform extrusion granulation, and controlling the particle size of the extrusion granulation to be 8 mm to obtain component B;

[0066] (3) starting a mixing tank, pumping the component B into the mixing tank, simultaneously adding hydrogel loaded urea into the mixing tank, and stirring for 10 min to mix, so that the preparation is completed.

[0067] A device for preparing an organic-inorganic compound fertilizer for torreya grandis, the device comprising a stirred tank, a granulator and a mixing tank; a first feeding port is arranged at the top of the stirred tank; a second feeding port is arranged at the top of the mixing tank; a discharging port is arranged at the lower part of the mixing tank; the lower part of the stirred tank and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0068] Example 3

[0069] An organic-inorganic compound fertilizer for torreya grandis, which is prepared from 55 parts by weight of hydrogel loaded urea, 45 parts by weight of polyphosphate, 45 parts by weight of potassium chloride, 6 parts by weight of shell powder, 7 parts by weight of wood ash, 8 parts by weight of humic acid, 1.5 parts by weight of microelement, 8 parts by weight of straw, 4 parts by weight of grass carbon, 7 parts by weight of loess and 33 parts by weight of deionized water.

[0070] The hydrogel loaded with urea is prepared by the following steps:

[0071] Step a: 9 parts by weight of polyvinyl alcohol and 23 parts by weight of N-isopropyl acrylamide are dissolved in 38 parts by weight of deionized water, stirred for 8 min, mixed to obtain solution a;

[0072] Step b: 0.4 parts by weight of crosslinking agent and 0.45 parts by weight of tert-butyl hydroperoxide are added to solution a, stirred for 8 min, mixed, then stopped stirring, and reacted in a nitrogen atmosphere at 35℃ for 22h to obtain material a;

[0073] Step c: material a is placed in a dialysis bag, then completely immersed in deionized water for 2h, during which the deionized water is replaced every 30 min, after the immersion is completed, dried at 50℃ until the constant weight to obtain the hydrogel;

[0074] Step d: 75 parts by weight of deionized water and 65 parts by weight of urea are added to the hydrogel, stirred for 18 min, mixed, then left for 3.5h to obtain solution b;

[0075] Step e: 9 parts by weight of polyacrylamide is added to solution b, then stirred for 25 min under ultrasonic mixing, and finally dried at 50℃ until the constant weight, and then crushed to complete the preparation.

[0076] The crosslinking agent in step b is N,N-methylene bisacrylamide.

[0077] The power of the ultrasonic in step e is 550W.

[0078] The particle size of the crushing in step e is 13mm.

[0079] The polyphosphate is oligomeric ammonium polyphosphate with an average degree of polymerization of 10.

[0080] The trace elements are mixed by 4 parts by weight of magnesium sulfate, 3.5 parts by weight of zinc sulfate, 2 parts by weight of manganese sulfate, 2 parts by weight of copper sulfate, 2.5 parts by weight of ammonium molybdate and 4 parts by weight of ferrous sulfate.

[0081] The straw is rice straw, corn straw and wheat straw, and the mass ratio is 1:1:1; the particle size of the straw is 9mm.

[0082] A preparation method of an organic-inorganic compound fertilizer for torreya grandis, the preparation method comprising the following steps:

[0083] (1) adding deionized water, polyphosphate and trace elements into the stirring kettle, stirring for 13 min, then adding loess, potassium chloride, shell powder, wood ash, humic acid, straw and grass carbon into the stirring kettle in sequence, continuing to stir for 18 min, to obtain component A;

[0084] (2) starting the granulator, pumping component A into the granulator for extrusion granulation, controlling the particle size of the extrusion granulation at 7 mm, to obtain component B;

[0085] (3) starting the mixing tank, pumping component B into the mixing tank, at the same time, adding hydrogel loaded urea into the mixing tank, stirring for 8 min for mixing, to complete the preparation.

[0086] An apparatus for preparing an organic-inorganic compound fertilizer for torreya grandis, comprising a stirring kettle, a granulator and a mixing tank; the top of the stirring kettle is provided with a first feeding port; the top of the mixing tank is provided with a second feeding port; the lower part of the mixing tank is provided with a discharging port; the lower part of the stirring kettle and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0087] Comparative Example 1

[0088] An organic-inorganic compound fertilizer for torreya grandis, which is prepared from 50 parts by weight of urea, 40 parts by weight of polyphosphate, 40 parts by weight of potassium chloride, 5 parts by weight of shell powder, 5 parts by weight of wood ash, 5 parts by weight of humic acid, 1 part by weight of trace elements, 5 parts by weight of straw, 3 parts by weight of grass carbon, 5 parts by weight of loess and 30 parts by weight of deionized water.

[0089] The polyphosphate is oligomeric ammonium polyphosphate, and the average degree of polymerization is 10.

[0090] The trace elements are mixed from 3 parts by weight of magnesium sulfate, 3 parts by weight of zinc sulfate, 1 part by weight of manganese sulfate, 1 part by weight of copper sulfate, 2 parts by weight of ammonium molybdate and 3 parts by weight of ferrous sulfate.

[0091] The straw is rice straw, corn straw and wheat straw, and the mass ratio is 1:1:1; and the particle size of the straw is 8 mm.

[0092] A preparation method of an organic-inorganic compound fertilizer for torreya grandis, comprising the following steps:

[0093] (1) adding deionized water, polyphosphate and trace elements into the stirring kettle, stirring for 10 min, then adding loess, potassium chloride, shell powder, wood ash, humic acid, straw and grass carbon into the stirring kettle in sequence, continuing to stir for 15 min, to obtain component A;

[0094] (2) Start the granulator, pump component A into the granulator for extrusion granulation, control the particle size of the extrusion granulation at 6 mm, and obtain component B;

[0095] (3) Start the mixing tank, pump component B into the mixing tank, at the same time, add urea into the mixing tank, stir for 5 min, and mix, and the preparation is completed.

[0096] A device for preparing organic-inorganic compound fertilizer for torreya grandis, the device comprising a stirring tank, a granulator and a mixing tank; the top of the stirring tank is provided with a first inlet; the top of the mixing tank is provided with a second inlet; the lower part of the mixing tank is provided with an outlet; the lower part of the stirring tank and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0097] Comparative Example 2

[0098] An organic-inorganic compound fertilizer for torreya grandis, which is prepared from 50 parts by weight of hydrogel loaded urea, 40 parts by weight of di-ammonium hydrogen phosphate, 40 parts by weight of potassium chloride, 5 parts by weight of shell powder, 5 parts by weight of wood ash, 5 parts by weight of humic acid, 1 part by weight of trace elements, 5 parts by weight of straw, 3 parts by weight of grass charcoal, 5 parts by weight of loess and 30 parts by weight of deionized water.

[0099] The hydrogel loaded urea is prepared by the following steps:

[0100] Step a: 8 parts by weight of polyvinyl alcohol and 20 parts by weight of N-isopropyl acrylamide are dissolved in 35 parts by weight of deionized water, stirred for 5 min, and mixed to obtain solution a;

[0101] Step b: 0.3 parts by weight of crosslinking agent and 0.4 parts by weight of tert-butyl hydroperoxide are added to solution a, stirred for 5 min, then stopped stirring, and reacted at 30°C in a nitrogen atmosphere for 20 h to obtain material a;

[0102] Step c: material a is placed in a dialysis bag, then completely immersed in deionized water for 2 h, during which the deionized water is replaced every 30 min, after the immersion is completed, drying is carried out at 50°C until the constant weight is obtained, and the hydrogel is obtained;

[0103] Step d: 70 parts by weight of deionized water and 60 parts by weight of urea are added to the hydrogel, stirred for 15 min, then left for 3 h, and solution b is obtained;

[0104] Step e: 8 parts by weight of polyacrylamide is added to solution b, then mixed under ultrasonic stirring for 20 min, and finally dried at 50℃ until constant weight, and then crushed to obtain the product.

[0105] The crosslinking agent in step b is N, N-methylene bisacrylamide.

[0106] The power of ultrasonic in step e is 500W.

[0107] The particle size of the crushed product in step e is 10mm.

[0108] The trace elements are mixed by 3 parts by weight of magnesium sulfate, 3 parts by weight of zinc sulfate, 1 part by weight of manganese sulfate, 1 part by weight of copper sulfate, 2 parts by weight of ammonium molybdate and 3 parts by weight of ferrous sulfate.

[0109] The straw is rice straw, corn straw and wheat straw, and the mass ratio is 1:1:1; the particle size of the straw is 8mm.

[0110] A preparation method of an organic-inorganic compound fertilizer for torreya grandis, comprising the following steps:

[0111] (1) deionized water, diammonium phosphate and trace elements are added into a stirred tank, stirred for 10 min, and then yellow soil, potassium chloride, shell powder, wood ash, humic acid, straw and grass carbon are sequentially added, and stirred for 15 min to obtain component A;

[0112] (2) a granulator is started, component A is pumped into the granulator for extrusion granulation, and the particle size of the extrusion granulation is controlled at 6mm to obtain component B;

[0113] (3) a mixing tank is started, component B is pumped into the mixing tank, and at the same time, hydrogel loaded urea is added into the mixing tank, stirred for 5 min to obtain the product.

[0114] A device for preparing an organic-inorganic compound fertilizer for torreya grandis, comprising a stirred tank, a granulator and a mixing tank; the top of the stirred tank is provided with a first inlet; the top of the mixing tank is provided with a second inlet; the lower part of the mixing tank is provided with an outlet; the lower part of the stirred tank and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0115] Comparative example 3

[0116] The organic-inorganic compound fertilizer for torreya grandis is prepared from 50 parts by weight of hydrogel loaded urea, 40 parts by weight of polyphosphate, 40 parts by weight of potassium chloride, 5 parts by weight of shell powder, 5 parts by weight of wood ash, 5 parts by weight of humic acid, 1 part by weight of trace elements, 5 parts by weight of straw, 3 parts by weight of grass carbon, 5 parts by weight of loess and 30 parts by weight of deionized water.

[0117] The hydrogel loaded urea is prepared by the following steps:

[0118] Step a: 8 parts by weight of polyvinyl alcohol and 20 parts by weight of N-isopropyl acrylamide are dissolved in 35 parts by weight of deionized water, stirred for 5 min and mixed to obtain solution a;

[0119] Step b: 0.3 parts by weight of crosslinking agent and 0.4 parts by weight of tert-butyl hydroperoxide are added to solution a, stirred for 5 min and mixed, then stirring is stopped, and reaction is carried out at 30°C in a nitrogen atmosphere for 20 h to obtain material a;

[0120] Step c: material a is placed in a dialysis bag, then completely immersed in deionized water for 2 h, during which deionized water is replaced every 30 min, after immersion, drying is carried out at 50°C until constant weight to obtain hydrogel;

[0121] Step d: 70 parts by weight of deionized water and 60 parts by weight of urea are added to the hydrogel, stirred for 15 min and mixed, then left for 3 h to obtain solution b;

[0122] Step e: solution b is dried at 50°C until constant weight, and then crushed to complete preparation.

[0123] The crosslinking agent in step b is N, N-methylene bisacrylamide.

[0124] The particle size of the crushed product in step e is 10 mm.

[0125] The polyphosphate is oligomeric ammonium polyphosphate with an average degree of polymerization of 10.

[0126] The trace elements are mixed from 3 parts by weight of magnesium sulfate, 3 parts by weight of zinc sulfate, 1 part by weight of manganese sulfate, 1 part by weight of copper sulfate, 2 parts by weight of ammonium molybdate and 3 parts by weight of ferrous sulfate.

[0127] The straw is rice straw, corn straw and wheat straw, and the mass ratio is 1:1:1; the particle size of the straw is 8 mm.

[0128] A preparation method of an organic-inorganic compound fertilizer for torreya grandis, the preparation method comprising the following steps:

[0129] (1) adding deionized water, polyphosphate and trace elements into the stirred tank, stirring for 10 min, then adding loess, potassium chloride, shell powder, wood ash, humic acid, straw and grass carbon into the stirred tank in sequence, continuing to stir for 15 min, to obtain component A;

[0130] (2) starting the granulator, pumping component A into the granulator for extrusion granulation, controlling the particle size of the extrusion granulation at 6 mm, to obtain component B;

[0131] (3) starting the mixing tank, pumping component B into the mixing tank, at the same time, adding hydrogel loaded urea into the mixing tank, stirring for 5 min, to complete the preparation.

[0132] A device for preparing an organic-inorganic compound fertilizer for torreya grandis, the device comprising a stirred tank, a granulator and a mixing tank; the top of the stirred tank is provided with a first feeding port; the top of the mixing tank is provided with a second feeding port; the lower part of the mixing tank is provided with a discharging port; the lower part of the stirred tank and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0133] Comparative Example 4

[0134] An organic-inorganic compound fertilizer for torreya grandis, which is prepared from 50 parts by weight of hydrogel loaded urea, 40 parts by weight of polyphosphate, 40 parts by weight of potassium chloride, 5 parts by weight of shell powder, 5 parts by weight of wood ash, 5 parts by weight of humic acid, 1 part by weight of trace elements, 5 parts by weight of straw, 3 parts by weight of grass carbon, 5 parts by weight of loess and 30 parts by weight of deionized water.

[0135] The hydrogel loaded urea is prepared by the following steps:

[0136] Step a: dissolving 8 parts by weight of polyvinyl alcohol and 20 parts by weight of N-isopropyl acrylamide in 35 parts by weight of deionized water, stirring for 5 min, to obtain solution a;

[0137] Step b: adding 0.3 parts by weight of crosslinking agent and 0.4 parts by weight of tert-butyl hydroperoxide into solution a, stirring for 5 min, then stopping stirring, carrying out reaction at 30℃ in a nitrogen atmosphere for 20 h, to obtain material a;

[0138] Step c: placing material a into a dialysis bag, then completely immersing in deionized water for 2 h, during which the deionized water is replaced every 30 min, after the immersion is completed, carrying out drying at 50℃ until constant weight, to obtain hydrogel.

[0139] Step d: 70 parts by weight of deionized water and 8 parts by weight of polyacrylamide are added to the hydrogel, and then mixed under ultrasonic stirring for 20 min to obtain solution b;

[0140] Step e: 60 parts by weight of urea is added to solution b, stirred for 15 min, and then left to stand for 3 h. Finally, drying is carried out at 50℃ until a constant weight is obtained, and then the product is crushed.

[0141] The crosslinking agent in step b is N, N-methylene bisacrylamide.

[0142] The power of the ultrasonic in step d is 500 W.

[0143] The particle size of the crushed product in step e is 10 mm.

[0144] The polyphosphate is oligomeric ammonium polyphosphate with an average degree of polymerization of 10.

[0145] The trace elements are a mixture of 3 parts by weight of magnesium sulfate, 3 parts by weight of zinc sulfate, 1 part by weight of manganese sulfate, 1 part by weight of copper sulfate, 2 parts by weight of ammonium molybdate, and 3 parts by weight of ferrous sulfate.

[0146] The straws are rice straw, corn straw, and wheat straw, with a mass ratio of 1:1:1; the particle size of the straws is 8 mm.

[0147] A preparation method of an organic-inorganic compound fertilizer for torreya grandis, the preparation method comprising the following steps:

[0148] (1) deionized water, polyphosphate, and trace elements are added to a stirred tank, stirred for 10 min, and then yellow soil, potassium chloride, shell powder, wood ash, humic acid, straw, and grass charcoal are sequentially added, and stirring is continued for 15 min to obtain component A;

[0149] (2) a granulator is started, component A is pumped into the granulator for extrusion granulation, and the particle size of the extrusion granulation is controlled at 6 mm to obtain component B;

[0150] (3) a mixing tank is started, component B is pumped into the mixing tank, and at the same time, hydrogel loaded urea is added to the mixing tank, stirred for 5 min, and then mixed to complete the preparation.

[0151] A device for preparing an organic-inorganic compound fertilizer for torreya grandis, the device comprising a stirred tank, a granulator, and a mixing tank; a first inlet is arranged at the top of the stirred tank; a second inlet is arranged at the top of the mixing tank; an outlet is arranged at the lower part of the mixing tank; the lower part of the stirred tank and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0152] Comparative Example 5

[0153] An organic-inorganic compound fertilizer for torreya grandis is prepared from 50 parts by weight of hydrogel loaded urea, 40 parts by weight of polyphosphate, 40 parts by weight of potassium chloride, 5 parts by weight of shell powder, 5 parts by weight of wood ash, 5 parts by weight of humic acid, 1 part by weight of trace elements, 5 parts by weight of straw, 3 parts by weight of grass charcoal, 5 parts by weight of loess and 30 parts by weight of deionized water.

[0154] The hydrogel loaded urea is prepared by the following steps:

[0155] Step a: 8 parts by weight of polyvinyl alcohol and 20 parts by weight of N-isopropyl acrylamide are dissolved in 35 parts by weight of deionized water, stirred for 5 min and mixed to obtain solution a;

[0156] Step b: 0.3 parts by weight of crosslinking agent and 0.4 parts by weight of tert-butyl hydroperoxide are added to solution a, stirred for 5 min and mixed, then stirring is stopped, and reaction is carried out at 30°C in a nitrogen atmosphere for 20 h to obtain material a;

[0157] Step c: material a is placed in a dialysis bag, then completely immersed in deionized water for 2 h, during which deionized water is replaced every 30 min, after immersion is completed, drying is carried out at 50°C until constant weight to obtain hydrogel;

[0158] Step d: 70 parts by weight of deionized water and 60 parts by weight of urea are added to the hydrogel, stirred for 15 min and mixed, then left to stand for 3 h to obtain solution b;

[0159] Step e: 8 parts by weight of polyacrylamide is added to solution b, then stirred for 20 min and mixed under ultrasonic, finally dried at 50°C until constant weight, and pulverized to complete preparation.

[0160] The crosslinking agent in step b is N, N-methylene bisacrylamide.

[0161] The power of ultrasonic in step e is 500 W.

[0162] The particle size of pulverization in step e is 10 mm.

[0163] The polyphosphate is oligomeric ammonium polyphosphate with an average degree of polymerization of 10.

[0164] The trace elements are mixed from 3 parts by weight of magnesium sulfate, 3 parts by weight of zinc sulfate, 1 part by weight of manganese sulfate, 1 part by weight of copper sulfate, 2 parts by weight of ammonium molybdate and 3 parts by weight of ferrous sulfate.

[0165] The straw is rice straw, corn straw and wheat straw, and the mass ratio is 1:1:1; the particle size of the straw is 8mm.

[0166] A preparation method of an organic-inorganic compound fertilizer for torreya grandis, the preparation method comprising the following steps:

[0167] (1) adding deionized water and trace elements into a stirred tank, stirring for 10 min, and then sequentially adding loess, potassium chloride, shell powder, wood ash, humic acid, straw and grass carbon into the stirred tank, continuing to stir for 15 min, to obtain component A;

[0168] (2) starting a granulator, pumping the component A into the granulator for extrusion granulation, and controlling the particle size of the extrusion granulation to be 6mm, to obtain component B;

[0169] (3) starting a mixing tank, pumping the component B into the mixing tank, and simultaneously adding hydrogel loaded urea and polyphosphate into the mixing tank, stirring for 5 min, to complete the preparation.

[0170] A device for preparing an organic-inorganic compound fertilizer for torreya grandis, the device comprising a stirred tank, a granulator and a mixing tank; the top of the stirred tank is provided with a first feeding port; the top of the mixing tank is provided with a second feeding port; the lower part of the mixing tank is provided with a discharging port; the lower part of the stirred tank and the upper part of the granulator are connected through a first pipeline; the lower part of the granulator and the upper part of the mixing tank are connected through a second pipeline; the first pipeline is provided with a pipeline pump; and the second pipeline is provided with a solid vacuum pump.

[0171] Test Example 1

[0172] Controlled release test at different temperatures:

[0173] The test steps are as follows:

[0174] (1) respectively weighing 200mL of deionized water at 15℃, 20℃, 25℃ and 30℃ in beakers.

[0175] (2) respectively weighing 40g of the hydrogel loaded urea prepared in Example 1, Comparative Example 3 and Comparative Example 4, and then loading into dialysis bags, and finally completely immersing the dialysis bags in the above deionized water, and standing for 72h, and the temperature set in step (1) needs to be maintained all the time during the standing process.

[0176] (3) taking out the dialysis bags, and after the solution in the beaker is naturally warmed / cooled to room temperature, the urea content is determined by using the p-dimethylaminobenzaldehyde spectrophotometry, so as to judge the controlled release effect, and the greater the absorbance (A), the higher the urea content (the more released at this temperature).

[0177] Table 1. Controlled release test results at different temperatures

[0178] 15℃ / A 20℃ / A 25℃ / A 30℃ / A Example 1 0.654 0.511 0.389 0.214 Comparative Example 3 0.784 0.695 0.597 0.488 Comparative Example 4 0.557 0.408 0.281 0.119

[0179] Test Example 2

[0180] Controlled release test at different pH:

[0181] The test procedure is as follows:

[0182] (1) Respectively weigh 200 mL of deionized water in a beaker, and then adjust the pH (to 5, 7, 9) by dropwise adding sodium hydroxide aqueous solution and hydrochloric acid aqueous solution (both with a concentration of 0.01 mol / L).

[0183] (2) Respectively weigh 40 g of the hydrogel prepared in Example 1, Comparative Example 3 and Comparative Example 4 loaded with urea, and then put them into dialysis bags, and finally immerse the dialysis bags completely in the above-mentioned solution with adjusted pH, stand for 20 min, and take out the dialysis bags.

[0184] (3) Continue to respectively weigh 200 mL of deionized water in a beaker, and then put the taken-out dialysis bags back for immersion, and stand for 14 days.

[0185] (4) Take out the dialysis bags, and determine the urea content in the solution in the beaker by p-dimethylaminobenzaldehyde spectrophotometry, so as to judge the controlled release effect. The greater the absorbance (A) is, the higher the urea content is (the less release at this pH is).

[0186] Table 2. Controlled release test results at different pH

[0187] pH = 5 / A pH = 7 / A pH = 9 / A Example 1 0.215 0.368 0.789 Comparative Example 3 0.387 0.425 0.478 Comparative Example 4 0.155 0.284 0.659

[0188] Test Example 3

[0189] Planting test:

[0190] The organic-inorganic compound fertilizers for torreya grandis prepared in Examples 1-3 and Comparative Examples 1-5 are respectively used for torreya grandis planting (Note: The torreya grandis used in this planting test is obtained by grafting), which also includes three commercially available fertilizers (Commercially available 1: N:P2O5:K2O is 14:16:15, commercially available 2: N:P2O5:K2O is 15:15:15, commercially available 3: N:P2O5:K2O is 16:16:8). During the planting, except that the used fertilizers are different, the rest such as fertilization frequency, soil properties, fertilization amount and other conditions are kept consistent, at the same time, the first year fruiting yield of torreya grandis and the time for starting fruiting are taken as statistical indexes, and ranking is respectively carried out, so as to show the effect size of the fertilizer. The later the ranking is, the less the yield is, and the more the time for starting fruiting is.

[0191] Table 3. Planting test results

[0192]

[0193]

[0194] By comparing examples 1-3, comparative examples 1-5 and test examples 1-3, it can be known that:

[0195] The difference between comparative example 1 and example 1 is that the urea is not loaded by the hydrogel.

[0196] The difference between comparative example 2 and example 1 is that the oligomeric ammonium polyphosphate is replaced by di-ammonium hydrogen phosphate.

[0197] The difference between comparative example 3 and example 1 is that the polyacrylamide is not added to form the interpenetrating structure of the multi-network.

[0198] The difference between comparative example 4 and example 1 is that the interpenetrating structure of the multi-network is formed first and then the urea is loaded.

[0199] The difference between comparative example 5 and example 1 is that the oligomeric ammonium polyphosphate is not used to complex the trace elements.

[0200] By comparing examples 1, comparative examples 3-4 and test examples 1-2, it can be known that the urea loaded by the hydrogel prepared by the present application can be better released in the temperature and pH range suitable for the growth and development of torreya grandis (the average annual temperature of torreya grandis in the normal growth and development period is 14-18℃, and the soil is slightly acidic to neutral), and relatively less released outside the range, which has the controlled release property. Although the urea loaded by the hydrogel prepared in comparative example 4 is the same as that in example 1, the step of forming the interpenetrating structure of the multi-network first and then loading the urea will result in a decrease in the loading amount.

[0201] By comparing examples 1-3, comparative examples 1-5 and test example 3, it can be known that the organic-inorganic compound fertilizer prepared by the present application is very suitable for the planting of torreya grandis, can shorten the fruiting time, promote the fruiting rate and improve the yield of torreya grandis.

[0202] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, change, equivalent change and modification of the above embodiments, which does not depart from the technical solution of the present application, are still within the scope of the present application.

Claims

1. An organic-inorganic compound fertilizer for Torreya grandis, characterized in that: The organic-inorganic compound fertilizer for Torreya grandis is prepared from 50-60 parts by weight of hydrogel-loaded urea, 40-50 parts by weight of polyphosphate, 40-50 parts by weight of potassium chloride, 5-8 parts by weight of shell powder, 5-8 parts by weight of wood ash, 5-10 parts by weight of humic acid, 1-2 parts by weight of trace elements, 5-10 parts by weight of straw, 3-5 parts by weight of peat, 5-8 parts by weight of loess and 30-35 parts by weight of deionized water. The hydrogel loaded with urea is prepared by the following steps: Step a: Dissolve 8-10 parts by weight of polyvinyl alcohol and 20-25 parts by weight of N-isopropylacrylamide in 35-40 parts by weight of deionized water, stir for 5-10 minutes to obtain solution a; Step b: Add 0.3-0.5 parts by weight of crosslinking agent and 0.4-0.5 parts by weight of tert-butyl hydrogen peroxide to solution a, stir for 5-10 minutes to mix, then stop stirring and react in a nitrogen atmosphere at 30-40℃ for 20-24 hours to obtain material a; Step c: Place material a in a dialysis bag and then completely immerse it in deionized water for 2 hours. Replace the deionized water every 30 minutes during this period. After immersion, dry it at 50°C until constant weight is achieved to obtain hydrogel. Step d: Add 70-80 parts by weight of deionized water and 60-70 parts by weight of urea to the hydrogel, stir for 15-20 minutes to mix, and then let stand for 3-4 hours to obtain solution b; Step e: Add 8-10 parts by weight of polyacrylamide to solution b, then stir under ultrasonication for 20-30 minutes to mix, and finally dry at 50°C until constant weight, then pulverize to complete the preparation. Wherein, the crosslinking agent in step b is N,N-methylenebisacrylamide; The method for preparing the organic-inorganic compound fertilizer for Torreya grandis includes the following steps: (1) Add deionized water, polyphosphate and trace elements to the mixing tank and stir for 10-15 minutes. Then add loess, potassium chloride, shell powder, wood ash, humic acid, straw and peat in sequence and continue stirring for 15-20 minutes to obtain component A. (2) Start the granulator and pump component A into the granulator for extrusion granulation. The particle size of the extruded granules is controlled at 6-8 mm to obtain component B. (3) Start the mixing tank, pump component B into the mixing tank, and at the same time, add hydrogel-loaded urea into the mixing tank. Stir for 5-10 minutes to mix, and the preparation is complete.

2. The organic-inorganic compound fertilizer for Torreya grandis according to claim 1, characterized in that: The power of the ultrasound in step e is 500-600W.

3. The organic-inorganic compound fertilizer for Torreya grandis according to claim 1, characterized in that: The particle size of the pulverized material in step e is 10-15 mm.

4. The organic-inorganic compound fertilizer for Torreya grandis according to claim 1, characterized in that: The polyphosphate is an oligomeric ammonium polyphosphate.

5. The organic-inorganic compound fertilizer for Torreya grandis according to claim 1, characterized in that: The trace elements are composed of 3-5 parts by weight of magnesium sulfate, 3-4 parts by weight of zinc sulfate, 1-3 parts by weight of manganese sulfate, 1-3 parts by weight of copper sulfate, 2-3 parts by weight of ammonium molybdate and 3-5 parts by weight of ferrous sulfate.

6. The organic-inorganic compound fertilizer for Torreya grandis according to claim 1, characterized in that: The straw is at least one of rice straw, corn straw, and wheat straw; the particle size of the straw is 8-10 mm.

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