CN112125714A - Low-cost drying method for batch wormcast or activated sludge - Google Patents
Low-cost drying method for batch wormcast or activated sludge Download PDFInfo
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- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
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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
A method for drying the earthworm excrement or activated sludge in batches at low cost includes such steps as mixing the earthworm excrement with wood dust, stacking it in a stack of 1 x2.5 m, laying aside for 2-3 days, turning over the mixture for 2-3 times per day, and natural drying for 3-12 days. The earthworm cast obtained by the invention is a black, uniform and fine-grained substance with natural earthy taste, the physical properties of the earthworm cast are determined by the properties of raw materials and the digestion degree of earthworms, and the earthworm cast has good porosity, air permeability, water drainage and high water holding capacity. And has large surface area, so that a plurality of beneficial microorganisms can live, the microorganism is rich in bacteria, actinomycetes and fungi, the microorganisms not only mineralize complex substances into effective substances which are easy to be absorbed by plants, but also synthesize a series of substances with biological activity, such as sugar, amino acid, vitamin and the like, and simultaneously, the pH of the mixture is reduced and tends to be neutral due to organic acid generated in the metabolism process of the microorganisms. Thus having a good capacity to absorb and retain nutrients.
Description
Technical Field
The invention relates to the technical field of wormcast drying, in particular to a low-cost drying method for batch wormcast or activated sludge.
Background
The mechanism of action of a plurality of research organisms on wormcast microorganisms at home and abroad is researched for many years, a large number of research achievements are obtained, and the mechanism mainly comprises the following five aspects: firstly, through the life activities of beneficial microorganisms, the molecular nitrogen which cannot be utilized in the air is fixedly converted into compound nitrogen, the compound phosphorus and potassium which cannot be utilized in the soil are analyzed into available phosphorus and potassium, and more than 10 medium and trace elements in the soil can be analyzed; secondly, by the life activity of beneficial microorganisms, auxin, cytokinin, gibberellin, indoleic acid and other plant hormones are secreted, but the plant hormones enter the growth of crops, regulate and control the metabolism of the crops, and produce high-quality products according to genetic codes; thirdly, beneficial microorganisms are propagated in the rhizosphere in a large quantity to generate a large quantity of mucopolysaccharide, and the mucopolysaccharide is combined with mucus secreted by plants, mineral colloid and organic colloid to form a soil grain-conglomeration structure, so that the fertilizer storage and water retention capacity of the soil is improved. Fourthly, the quantity and activity of microorganisms in the wormcast are increased by a large number of microorganisms in the wormcast, the competitiveness of the microorganisms competing with pathogenic bacteria for nutrition and energy in the sick soil is enhanced, and the full play of the propagation potential of the pathogenic bacteria is limited; and beneficial microorganisms in the wormcast can also generate antibiotics with strong antagonistic activity and wide antibacterial spectrum, so that the growth of pathogenic bacteria is limited, and soil-borne diseases of plants are inhibited.
At present, the earthworm casts just harvested mostly contain moisture and other impurities, and the earthworm casts need to be dried, screened, packaged, stored, transported and the like.
The drying of the wormcast is generally realized by adopting a natural air drying method and an artificial drying method. The method for drying the wormcast is limited to drying modes such as natural air drying, insolation and drying, wherein the natural air drying is to place the collected wormcast in a well-ventilated place for airing, and the air drying is carried out at a speed which can not damage microorganisms in the wormcast and is long in time. Although infrared baking is adopted to remove the moisture in the earthworm casts, the speed is higher. However, since the wormcast contains various microorganisms, baking and exposure to the wormcast can affect the activity of the microorganisms and can also volatilize nutrients.
Disclosure of Invention
The invention aims to provide a method for drying low-cost batch wormcast or activated sludge, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a drying method of low-cost batch wormcast is characterized by comprising the following steps:
A. collecting wormcast to be treated, mixing sawdust with the wormcast to be treated, stacking into stacks with the width of 1 m and the height of 2.5 m, and placing for 2-3 days;
B. turning over the mixture for 2-3 times per day, and naturally drying for 3-12 days;
C. sieving the mixture with 2.5-9 mesh sieve to obtain dried wormcast as undersize material, and recovering sawdust as oversize material.
Preferably, the wood chips are selected from one or more of poplar, willow, paper mulberry, oak, elm and tung in any proportion.
Preferably, in the step B, after the mixture is continuously stirred for 3 days, the mixture needs to be detected, and when the humidity of the mixture is detected to be 35-50%, the step C can be started.
Preferably, the wood chips have a width of 1 to 4cm and a length of 2 to 9 cm.
Preferably, in the step B, a pile turning machine is adopted for turning piles.
Preferably, in the step A, the accumulated temperature of the strip stacks can reach more than 50 ℃.
Preferably, the dried wormcast is a black, uniform and finely-divided substance with natural earthy taste.
A drying method of low-cost batch activated sludge is characterized by comprising the following steps: A. collecting sludge, controlling the sludge moisture to be 55-95%, mixing wormcast and sludge, and uniformly mixing to obtain a sludge mixture to be treated; mixing sawdust with the sludge mixture to be treated, stacking into a stack with the width of 1 meter and the height of 2.5 meters, and standing for 2-3 days;
B. turning over the mixture for 2-3 times per day, and naturally drying for 3-12 days;
C. and (3) sieving the mixture by a 2.5-9-mesh sieve to obtain undersize, namely the dried sludge mixture, and recycling sawdust on the oversize.
Preferably, in the step B, after the mixture is continuously stirred for 3 days, the mixture needs to be detected, and when the humidity of the mixture is detected to be 35-50%, the step C can be started.
Preferably, the wood chips have a width of 1 to 4cm and a length of 2 to 9 cm.
Preferably, in the step B, a pile turning machine is adopted for turning piles.
Preferably, in the step A, the accumulated temperature of the strip stacks can reach more than 50 ℃.
Preferably, the dried sludge mixture is a black-like, homogeneous, finely divided material having a natural earthy taste.
Preferably, the sludge mixture is also added with a composition of 1-2% of aerobic activated sludge and 0.5-1.2% of anaerobic granular activated sludge, 0.8-1.2% of anaerobic ammonia oxidation sludge and 0.2-0.5% of denitrifying bacteria, the composition is divided into two parts, the first part of the composition is mixed with the earthworm cast and the sludge in the step A and is uniformly mixed; adding 30-100 times of water and 0.5-1.2 times of cellulose derivative into the second composition to obtain suspension, and spraying while stirring in step B.
The wormcast and sludge mixture obtained by the method has good porosity, air permeability, water drainage and high water holding capacity. And has large surface area, so that a plurality of beneficial microorganisms can live, the microorganism is rich in bacteria, actinomycetes and fungi, the microorganisms not only mineralize complex substances into effective substances which are easy to be absorbed by plants, but also synthesize a series of substances with biological activity, such as sugar, amino acid, vitamin and the like, and simultaneously, the pH of the mixture is reduced and tends to be neutral due to organic acid generated in the metabolism process of the microorganisms. Therefore, the earthworm dung and the activated sludge have good capacity of absorbing and maintaining nutrient substances, and some nutrient elements and trace elements necessary for plant growth not only exist in nutrient soil, but also have high content, so that the soil structure can be obviously improved, the fertility is improved, the soil hardening problem is thoroughly solved, the quality of agricultural products, particularly the quality of fruit and vegetable products can be greatly improved, the earthworm dung and the activated sludge have excellent effect, and the earthworm dung and the activated sludge are easily absorbed by plants.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1: a drying method of low-cost batch wormcast is characterized by comprising the following steps:
A. collecting wormcast to be treated, and mixing sawdust with the wormcast to be treated, wherein the sawdust is selected from one or a combination of more of poplar, willow, broussonetia papyrifera, oak, elm, tung wood and the like in any proportion, and is 1cm wide and 2cm long. Stacking the mixture into a strip pile with the width of 1 meter and the height of 2.5 meters, and standing for 2 days, wherein the accumulated temperature of the strip pile can reach more than 50 ℃;
B. turning the mixture by a turning machine for 2 times per day, and naturally drying for 3-12 days; after continuously turning for 3 days, detecting the mixture, and starting the step C when the humidity of the mixture is detected to be 35-50%;
C. sieving the mixture with 2.5-9 mesh sieve to obtain dried wormcast as undersize material, and recovering sawdust as oversize material.
Example 2: a drying method of low-cost batch wormcast is characterized by comprising the following steps:
A. collecting wormcast to be treated, and mixing sawdust with the wormcast to be treated, wherein the sawdust is selected from one or a combination of more of poplar, willow, broussonetia papyrifera, oak, elm, tung wood and the like in any proportion, and is 2cm wide and 5cm long. Stacking the mixture into a strip pile with the width of 1 meter and the height of 2.5 meters, and standing for 3 days, wherein the accumulated temperature of the strip pile can reach more than 50 ℃;
B. turning the mixture by a turning machine for 3 times per day, and naturally drying for 3-12 days; after continuously turning for 3 days, detecting the mixture, and starting the step C when the humidity of the mixture is detected to be 35-50%;
C. sieving the mixture with 2.5-9 mesh sieve to obtain dried wormcast as undersize material, and recovering sawdust as oversize material.
Example 3: a drying method of low-cost batch wormcast is characterized by comprising the following steps:
A. collecting wormcast to be treated, and mixing sawdust with the wormcast to be treated, wherein the sawdust is selected from one or a combination of more of poplar, willow, broussonetia papyrifera, oak, elm, tung wood and the like in any proportion, and is 4cm wide and 9cm long. Stacking the mixture into a strip pile with the width of 1 meter and the height of 2.5 meters, and standing for 3 days, wherein the accumulated temperature of the strip pile can reach more than 50 ℃;
B. turning the mixture by a turning machine for 3 times per day, and naturally drying for 3-12 days; after continuously turning for 3 days, detecting the mixture, and starting the step C when the humidity of the mixture is detected to be 35-50%;
C. sieving the mixture with 2.5-9 mesh sieve to obtain dried wormcast as undersize material, and recovering sawdust as oversize material.
In the embodiments 1-3 of the invention, detection shows that the content of microorganisms in the wormcast is about 1 hundred million/g, and the wormcast especially contains a certain amount of antagonistic microorganisms, wherein the antagonistic microorganisms comprise streptomyces globisporus and streptomyces syringin. The streptomyces can produce antibiotics and other secondary metabolites, extracellular hydroenergy enzyme is produced by utilizing soluble organic matters, and the secreted hydrolase is integrated into high concentration through hypha infiltrated into a medium, so that the medium has strong competitiveness in soil, the reproduction of other disease bacteria is inhibited, and the occurrence of plant soil-borne diseases is reduced. After the beneficial microbes are applied to soil, the propagation of harmful bacteria is quickly inhibited, the propagation of the beneficial bacteria is expanded, the occurrence of soil-borne diseases is reduced, crops are not easy to get ill, and the nitrogen fixation, potassium dissolution and phosphorus dissolution capabilities of plant roots are increased. Can improve the physical and chemical properties of soil, diversify and easily absorb soil components, generate biological energy for forming and developing soil fertility, improve the power of energy conversion of soil between organic matters and inorganic matters, and protect the ecological environment of the soil.
The humic acid organic fertilizer has the humic acid content of 29-41%, greatly improves the fertilizer supply capacity of soil, improves the soil structure and balances the pH value, and the humic acid determines the acidity, hydrophilicity, ion exchange property, complexation property, higher adsorption capacity, buffering capacity and catalytic capacity of humic acid through chemical and physical actions such as bonding, hydrogen bonding, adsorption and the like. Can improve the disease resistance and stress resistance of plants; the physical and chemical properties of the soil are improved, and the granular structure is improved; the soil hardening caused by using a large amount of chemical fertilizer is inhibited and relieved; promoting the activity and the propagation of soil microorganisms; decompose organic matters in soil and provide nutrients for plants.
Example 4: a drying method of low-cost batch activated sludge is characterized by comprising the following steps:
A. collecting sludge, controlling the sludge moisture to be 50-95%, mixing wormcast and sludge in any proportion, and uniformly mixing to obtain a sludge mixture to be treated; the sludge mixture is also added with a composition of aerobic activated sludge accounting for 1 percent of the total weight of the sludge mixture, anaerobic granular activated sludge accounting for 0.4 percent of the total weight of the sludge mixture, anaerobic ammonium oxidation sludge accounting for 0.5 percent of the total weight of the sludge mixture and denitrifying bacteria accounting for 0.2 percent of the total weight of the sludge mixture;
mixing sawdust with the sludge mixture to be treated, stacking into a stack with a width of 1 m and a height of 2.5 m, and standing for 2-3 days until the accumulated temperature of the stack reaches above 50 ℃; the wood chips are selected from one or more of poplar, willow, paper mulberry, oak, elm, tung and the like in any proportion, and are 1-4 cm wide and 2-9 cm long;
B. taking a composition of aerobic activated sludge accounting for 1 percent of the total weight of the sludge mixture, anaerobic granular activated sludge accounting for 0.4 percent of the total weight of the sludge mixture, anaerobic ammonium oxidation sludge accounting for 0.5 percent of the total weight of the anaerobic ammonium oxidation sludge and denitrifying bacteria accounting for 0.2 percent of the total weight of the anaerobic ammonium oxidation sludge, mixing the composition with water accounting for 30 times of the total weight of the composition and cellulose derivatives accounting for 0.5 time of the total weight of the composition to prepare a suspension, turning the mixture for 2 to 3 times per day by adopting a pile turning machine;
adding water 30 times the total weight of the sludge mixture and cellulose derivatives 0.5 times the total weight of the sludge mixture to prepare a suspension, and spraying the suspension while turning in the step B; adopting natural air drying for 3-12 days; after continuously turning for 3 days, detecting the mixture, and starting the step C when the humidity of the mixture is detected to be 35-50%;
C. sieving the mixture with 2.5-9 mesh sieve to obtain dried wormcast as undersize material, and recovering sawdust as oversize material.
Example 5: a drying method of low-cost batch activated sludge is characterized by comprising the following steps:
A. collecting sludge, controlling the sludge moisture to be 50-95%, mixing wormcast and sludge in any proportion, and uniformly mixing to obtain a sludge mixture to be treated; the sludge mixture is also added with a composition of 0.7 percent of aerobic activated sludge, 0.5 percent of anaerobic granular activated sludge, 0.6 percent of anaerobic ammonia oxidation sludge and 0.1 percent of denitrifying bacteria by the total weight of the sludge mixture;
mixing sawdust with the sludge mixture to be treated, stacking into a stack with a width of 1 m and a height of 2.5 m, and standing for 2-3 days until the accumulated temperature of the stack reaches above 50 ℃; the wood chips are selected from one or more of poplar, willow, paper mulberry, oak, elm, tung and the like in any proportion, and are 1-4 cm wide and 2-9 cm long;
B. taking a composition of aerobic activated sludge accounting for 0.7 percent of the total weight of the sludge mixture, anaerobic granular activated sludge accounting for 0.5 percent of the total weight of the sludge mixture, anaerobic ammonium oxidation sludge accounting for 0.6 percent of the total weight of the anaerobic ammonium oxidation sludge and denitrifying bacteria accounting for 0.1 percent of the total weight of the anaerobic ammonium oxidation sludge, mixing the composition with water accounting for 50 times of the total weight of the composition and cellulose derivatives accounting for 0.8 time of the total weight of the composition to prepare a suspension, turning the mixture for 2 to 3 times per day by adopting a pile turning machine;
adding water 50 times the total weight of the sludge mixture and cellulose derivatives 0.8 times the total weight of the sludge mixture to prepare a suspension, and spraying the suspension while turning in the step B; adopting natural air drying for 3-12 days; after continuously turning for 3 days, detecting the mixture, and starting the step C when the humidity of the mixture is detected to be 35-50%;
C. sieving the mixture with 2.5-9 mesh sieve to obtain dried wormcast as undersize material, and recovering sawdust as oversize material.
Example 6: a drying method of low-cost batch activated sludge is characterized by comprising the following steps:
A. collecting sludge, controlling the sludge moisture to be 50-95%, mixing wormcast and sludge in any proportion, and uniformly mixing to obtain a sludge mixture to be treated; the sludge mixture is also added with a composition of 0.8 percent of aerobic activated sludge and 0.6 percent of anaerobic granular activated sludge, 0.6 percent of anaerobic ammonium oxidation sludge and 0.1 percent of denitrifying bacteria by the total weight of the sludge mixture;
mixing sawdust with the sludge mixture to be treated, stacking into a stack with a width of 1 m and a height of 2.5 m, and standing for 2-3 days until the accumulated temperature of the stack reaches above 50 ℃; the wood chips are selected from one or more of poplar, willow, paper mulberry, oak, elm, tung and the like in any proportion, and are 1-4 cm wide and 2-9 cm long;
B. taking a composition of aerobic activated sludge accounting for 0.8 percent of the total weight of the sludge mixture, anaerobic granular activated sludge accounting for 0.6 percent of the total weight of the sludge mixture, anaerobic ammonium oxidation sludge accounting for 0.6 percent of the total weight of the anaerobic ammonium oxidation sludge and denitrifying bacteria accounting for 0.1 percent of the total weight of the anaerobic ammonium oxidation sludge, mixing the composition with water accounting for 100 times of the total weight of the composition and cellulose derivatives accounting for 1.2 times of the total weight of the composition to prepare a suspension, turning the mixture for 2 to 3 times per day by adopting a pile turning machine;
adding water which is 100 times of the total weight of the sludge mixture and cellulose derivatives which are 1.2 times of the total weight of the sludge mixture into the sludge mixture to prepare a suspension, and spraying the suspension when the suspension is turned in the step B; adopting natural air drying for 3-12 days; after continuously turning for 3 days, detecting the mixture, and starting the step C when the humidity of the mixture is detected to be 35-50%;
C. sieving the mixture with 2.5-9 mesh sieve to obtain dried wormcast as undersize material, and recovering sawdust as oversize material.
In the embodiments 4-6 of the invention, the content of organic matters in the activated sludge is about 30%, and the organic matters are subjected to strip pile accumulated temperature fermentation and wood chip promoted fermentation, so that the formed organic matters have high quality, are easy to dissolve in soil and are easy to be absorbed by plants. The invention can promote the soil granular structure, improve the soil permeability, the water retention property and the fertility, is beneficial to the reproduction and the increase of microorganisms, enhances the capacities of absorbing and storing nutrients of the soil, and solves the problems of multiple application times, large amount, easy loss, low utilization rate and the like of the fertilizer from the source. Organic matter particles after earthworm digestion are fine, the surface area is improved by more than 100 times compared with that before digestion, more opportunities can be provided for the soil to contact with air, and the problem of soil hardening is fundamentally solved. The use of farmers shows that: the effect of every 1 jin of activated sludge of the invention can be equal to 10 jin of farmyard manure, thus being economical and practical and convenient to apply.
The fermented activated sludge mixture contains a large amount of microorganisms, the number of beneficial bacteria of the microorganisms is multiplied after the microorganisms are digested by earthworms, and the nutrition-dependent pathogenic bacteria are controlled. After the wormcast and the activated sludge are applied into the soil, the activity of organic nutrient substances in the soil is rapidly regulated and controlled, and the propagules of some pathogenic bacteria cannot grow and reproduce due to insufficient nutrition, so that the harm of the pathogenic bacteria to the root system of the host plant is inhibited.
The application mode is as follows:
1. when the feed is used for fattening shrimp ponds and jumping fish ponds, 300 kilograms of feed is applied per mu.
2. In the flowerpot according to the proportion of 1:3 (1 part of nutrient soil and 3 parts of garden soil), the flowers are planted after the nutrient soil is mixed, and no fertilizer is applied or the pots are turned over and the soil is changed within 1-2 years. Or lightly mixing 1-2 cups (about 2 two) of nutrient soil on the surface of the pot soil every 2-3 months.
3. Half cup of nutrient soil is put in each vegetable pit or applied once in 1-2 months (half cup per vegetable pit or one cup per ruler).
4. The nutrient soil is used as a formula according to the mixing proportion of 1 part of nutrient soil and 3 parts of soil.
5. Newly transplanted trees and shrubs can be planted by mixing 1 part of nutrient soil and 3 parts of garden soil, planting the plants in the holes, covering soil and watering.
6. The new lawn comprises the following steps: applying nutrient soil 1-2 jin/m into the surface soil, covering the soil with broken straw and keeping its humidity.
7. Court, stadium lawn: 4 jin of nutrient soil is uniformly spread on the surface layer of the lawn every 10 square meters.
8. Fruit, flower or diseased potted plants: soaking 1 part of the nutrient soil in 3 parts of water for more than 24 hours to prepare a mixture (tea water), and applying the mixture on the surface of a plant, a fruit or a flower.
9. Tea planting: applying 200-300 g of the fertilizer to roots every 2-3 months, and covering soil.
10. Generally, the economic crops are applied by 100-200 kg per each unit of land, 70% of the economic crops are recommended to be used as base fertilizer and 30% of the economic crops are recommended to be used as additional fertilizer, meanwhile, the dosage of the chemical fertilizer can be correspondingly reduced according to the proportion of 1: 1-1: 3, and the dosage of the chemical fertilizer can be further reduced after the economic crops are applied for two years. The dosage of the fruit trees can be increased to 200-300 kg/mu per year. The flower can be reduced to about 100 kg/mu per year. The dosage of other crops can be increased or decreased according to the situation of the land.
Claims (9)
1. A drying method of low-cost batch wormcast is characterized by comprising the following steps:
A. collecting wormcast to be treated, mixing sawdust with the wormcast to be treated, stacking into stacks with the width of 1 m and the height of 2.5 m, and placing for 2-3 days;
B. turning over the mixture for 2-3 times per day, and naturally drying for 3-12 days;
C. sieving the mixture with 2.5-9 mesh sieve to obtain dried wormcast as undersize material, and recovering sawdust as oversize material.
2. The method for drying the low-cost batch wormcast as claimed in claim 1, wherein the wood chips are selected from one or more of poplar, willow, paper mulberry, oak, elm and tung wood in any ratio.
3. The method for drying the low-cost batch wormcast as claimed in claim 1, wherein in the step B, after the mixture is continuously turned for 3 days, the mixture needs to be detected, and when the humidity of the mixture is detected to be 35-50%, the step C is started.
4. The method for drying the low-cost batch wormcast as claimed in claim 1, wherein the width of the wood chips is 1-4 cm, and the length of the wood chips is 2-9 cm.
5. The method for drying the low-cost batch wormcast as claimed in claim 1, wherein in the step B, a pile turning machine is adopted for turning piles.
6. The method for drying the low-cost batch wormcast as claimed in claim 1, wherein in the step A, the accumulated temperature of the stacks can reach more than 50 ℃.
7. The method for drying the earthworm cast in batches at low cost according to the claim 1, wherein the dried earthworm cast is a black, uniform and fine-grained substance with natural earthy taste.
8. A low-cost drying method for batch activated sludge is characterized by comprising the following steps:
A. collecting sludge, controlling the sludge moisture to be 55-95%, mixing wormcast and sludge, and uniformly mixing to obtain a sludge mixture to be treated; mixing sawdust with the sludge mixture to be treated, stacking into a stack with the width of 1 meter and the height of 2.5 meters, and standing for 2-3 days;
B. turning over the mixture for 2-3 times per day, and naturally drying for 3-12 days;
C. and (3) sieving the mixture by a 2.5-9-mesh sieve to obtain undersize, namely the dried sludge mixture, and recycling sawdust on the oversize.
9. The method for drying low-cost batch activated sludge as claimed in claim 8, wherein the sludge mixture further comprises a composition of aerobic activated sludge 1-2% and anaerobic granular activated sludge 0.5-1.2%, anaerobic ammonium oxidation sludge 0.8-1.2%, denitrifying bacteria 0.2-0.5% by weight of the total sludge mixture, the composition is divided into two parts, the first part of the composition is mixed with wormcast and sludge in step A, and the mixture is mixed uniformly; adding 30-100 times of water and 0.5-1.2 times of cellulose derivative into the second composition to obtain suspension, and spraying while stirring in step B.
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Application publication date: 20201225 |