A molluscicide fertilizer granule and a preparation method thereof

Abstract

The application discloses a snail-preventing and controlling medicine-fertilizer granule and a preparation method thereof. The snail-preventing and controlling medicine-fertilizer granule comprises ferrous lactate, an attractant, a slow-release material, an additive and the rest of tea dregs. The ferrous lactate and the tea dregs are combined to prevent and control snails, and a synergistic effect is achieved. The problems of water pollution caused by tetraacetaldehyde, the problem of heavy metal enrichment caused by the mixture of EDTA iron sodium and normal phosphoric acid iron, the problem of short medicine effect duration caused by the tea dregs impregnated water solution, and the problem of slow effect and poor prevention and control effect caused by dry tea dregs scattering are overcome. The snail-preventing and controlling medicine-fertilizer granule has the characteristics of super-long prevention and control time and good snail prevention and control effect. The ferrous lactate can provide trace element iron for vegetation in soil. After the tea dregs are fermented in soil, the tea dregs have the effects of improving soil and promoting crop growth, and have the functions of both a fertilizer and a biological pesticide.

Description

Technical Field

[0001] This invention relates to the field of pesticide and fertilizer technology, specifically to a pesticide and fertilizer granule for snail control and its preparation method. Background Technology

[0002] Snails belong to the phylum Mollusca, class Gastropoda. They primarily damage more than 10 kinds of cruciferous vegetables, including Chinese cabbage, bok choy, cabbage, and cauliflower, as well as legumes, lettuce, romaine lettuce, and melons. They harm crops by feeding on plant stems and leaves, with the greatest damage occurring during the seedling stage. The most widely registered snail control agent in China is metaldehyde. While metaldehyde is harmless to humans, it is difficult to remove from water, posing an "unacceptable risk" to wild animals, birds, and pets that prey on snails and slugs. Due to concerns about drinking water safety and animal protection, European countries have decided to gradually ban metaldehyde. EDTA (sodium iron) and ferric orthophosphate have also been reported as snail control agents. EDTA can accumulate in the environment, acting as a shield for heavy metals, leading to pollution from the accumulation of heavy metals in natural water. Ferric orthophosphate has been reported to be prepared as an attractant granule for snail control. Previous studies have found that ferrous lactate also has a certain control effect on snails. Its mechanism of action is similar to that of ferric orthophosphate. After snails ingest it, ferrous lactate interferes with the calcium metabolism in the insect's intestines, causing the snails to stop feeding almost immediately and die within three to six days. Compared with ferric orthophosphate, ferrous lactate, in addition to having effective stomach poison activity, also has better affinity and a certain attraction effect on snails. At the same time, ferrous lactate can provide the trace element iron to vegetation in the soil.

[0003] Tea saponins are a class of glycoside compounds extracted from tea tree seeds. They possess hemolytic, piscitoxic, anti-inflammatory, and plant hormone-like activities, and can be directly used to control pests. Tea saponins have been successfully used to control molluscs (multiple studies report on tea saponins for snail control). Tea meal, the residue left after pressing oil from camellia seeds, is a byproduct of camellia seed processing. It consists of crude protein, sugars, saponins, crude fat, tannins, crude fiber, caffeine, and minerals. The abundant tea saponins it contains have a significant effect on snail control (literature reports on tea meal for snail control), while the crude protein, crude fat, and oils it contains have a good affinity for snails. After fermentation in soil, tea meal also improves soil quality and promotes crop growth, acting as both a fertilizer and a biological pesticide. Currently, the main methods for using tea seed cake to control snails are: 1) Crush 3-4 kg of tea seed cake, soak it in water for 8 hours, and then spray the filtered liquid with 50-75 kg of water. The effectiveness of this method disappears in about 5 days, and the duration of effect is not strong. 2) Mix tea seed cake with wood ash and fertilizer, and apply it as a base fertilizer before sowing or transplanting vegetables. However, the dry application of tea seed cake is slow to take effect, taking about a week. Since some vegetables germinate in 3-4 days after sowing, there is a significant time lag, and snails are very likely to damage newly emerged vegetables. Using tea seed cake alone is not very effective in controlling snails, and this method is less effective in areas with high snail populations. Furthermore, while combining tea seed cake with wood ash can enhance the snail control effect, the loss of tea saponins in the tea seed cake is rapid due to factors such as wood ash and moisture, and the control effect of this combination lasts at most a month. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a granular pesticide for controlling snails that can slowly release tea saponins from tea meal, has an ultra-long control time, and a good snail control effect, as well as its preparation method.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a granular medicated fertilizer for snail control, wherein the granular medicated fertilizer for snail control comprises the following components by weight percentage: ferrous lactate 1% to 40%, attractant 0.1% to 2.0%, slow-release material 0.1% to 3.0%, adjuvant 3% to 22%, and the balance being tea seed cake; wherein the slow-release material is urea-formaldehyde.

[0006] Furthermore, the tea meal is pretreated by the following methods: 1) crushing and drying the tea meal to obtain dried tea meal; 2) adding petroleum ether to the dried tea meal, stirring, and centrifuging to obtain defatted tea meal; 3) adding a mixture of petroleum ether and acetone to the defatted tea meal, stirring, and centrifuging to obtain pretreated tea meal; the volume fraction of acetone in the petroleum ether and acetone mixture is 15% to 20%.

[0007] Furthermore, the attractant is one or more of the following: flavoring agent, macaroni, malted milk powder, protein powder, condensed milk, and milk powder.

[0008] Furthermore, the additives include lubricants, dispersants, and disintegrants.

[0009] Furthermore, the lubricant is talc or magnesium stearate; the amount of lubricant added is 0-2%.

[0010] Further, the dispersant is one or more of sodium lignosulfonate, calcium lignosulfonate, sodium dodecylbenzenesulfonate, naphthalenesulfonate formaldehyde condensate, and solid polycarboxylate; the amount of the dispersant added is 3-10%.

[0011] Furthermore, the disintegrant is one or more selected from urea, ammonium sulfate, potassium sulfate, ammonium nitrate, potassium nitrate, starch, and sodium carboxymethyl cellulose; the amount of disintegrant added is 0-10%.

[0012] This invention also provides a method for preparing a granular medicated fertilizer for snail control, comprising the following steps:

[0013] (1) Weighing of raw materials: Weigh each component of the snail-controlling granule according to the weight percentage;

[0014] (2) Preparation of master powder: ferrous lactate, additives and tea seed cake are mixed evenly and then pulverized by airflow to obtain master powder;

[0015] (3) Preparation of adhesive substitute liquid: Dissolve the attractant and urea-formaldehyde in water and mix them evenly to obtain adhesive substitute liquid;

[0016] (4) Fluidized bed granulation: The mother powder from step (2) is put into a fluidized bed granulator to fluidize the mother powder, and then the binder substitute liquid is sprayed in to make the powder condense into granules. After the moisture content of the granules is less than 2wt%, they are sieved, measured and packaged to obtain the snail control fertilizer granules.

[0017] Furthermore, in step (4), before the mother powder from step (2) is fed into the fluidized bed granulator, it is first passed through a 300-500 mesh sieve.

[0018] Furthermore, in step (4), the inlet temperature of the fluidized bed granulator is controlled at 75-80°C, the outlet temperature is controlled at 50-55°C, and the wind speed inside the fluidized bed granulator is controlled at 60-65 Hz.

[0019] This invention discloses a granular pesticide-fertilizer for snail control and its preparation method. Currently, there are no reports on the use of ferrous lactate for snail control. This invention is the first to propose that ferrous lactate can be used for snail control. This invention combines ferrous lactate and tea seed cake for snail control, achieving a synergistic effect. It overcomes the problems of water pollution caused by metaldehyde in snail control, the accumulation of heavy metals in EDTA when using a mixture of EDTA iron sodium and ferric orthophosphate, the short duration of efficacy of tea seed cake soaked in aqueous solution, and the slow onset and poor control effect of dry application of tea seed cake. It features an ultra-long control time and excellent snail control effect. Furthermore, ferrous lactate can provide trace element iron to vegetation in the soil, and after fermentation in the soil, tea seed cake also improves soil and promotes crop growth, thus acting as both a fertilizer and a biological pesticide.

[0020] This invention discloses a granular medicated fertilizer for snail control and its preparation method. The active ingredient of the granular medicated fertilizer is ferrous lactate, added at a concentration of 1%-40%. Ferrous lactate has effective stomach poisoning and attraction effects on snails. The granular medicated fertilizer uses tea seed cake as a fertilizer carrier, which can be completely degraded into soil nutrients, achieving the effect of enriching and improving the soil. At the same time, the tea saponins contained in tea seed cake have a certain control effect on snails, while the crude protein, crude fat, and oil contained in it have a good affinity for snails. In addition to the attraction and affinity of ferrous lactate to snails, the granular medicated fertilizer also contains an aromatic attractant, which has a very strong affinity for snails. The attractant is mixed with the capsule wall, and a spray film-forming method is used during the fluidized bed granulation process, resulting in good slow-release performance and an ultra-long control time. The granular medicated fertilizer can be applied to crops such as cabbage, bok choy, and Dendrobium officinale to control snails by broadcasting.

[0021] This invention discloses a granular medicated fertilizer for snail control and its preparation method. The active ingredient of the granular medicated fertilizer is ferrous lactate, which is easily oxidized to ferric salt when exposed to moisture or light. The main component of the granular medicated fertilizer is tea seed cake. Pretreatment of the tea seed cake can reduce its oxygen and water absorption capacity, further delay the oxidation of ferrous lactate in the granular medicated fertilizer, increase the stability of the granular medicated fertilizer, and extend the snail control period.

[0022] This invention discloses a granular medicated fertilizer for snail control and its preparation method. Indoor bioassay experiments using ferrous lactate were conducted to verify the control efficacy and mechanism of action of ferric orthophosphate and emulsified ferrous lactate against snails. The indoor bioassay experiments are as follows:

[0023] Test snail:

[0024] Gray snails with 4-5.5 whorls were captured from the field, and after being fed and rejuvenated indoors for 2 days, snails with good activity and open mouths were selected for various experiments.

[0025] Test reagents

[0026] Commercially available ferrous lactate (food grade, 99% purity)

[0027] Ferric orthophosphate (industrial grade, 98% purity)

[0028] Experimental section:

[0029] 1. Determination of contact toxicity to snails using the snail immersion method.

[0030] The test reagents ferrous lactate and ferric orthophosphate were diluted with sterile water to five concentration gradients: 5, 10, 20, 40, and 80 mg / mL. Snails were immersed in each concentration solution for 5 seconds, then removed and placed directly into a rearing box containing moistened absorbent cotton. They were fed with sterile water-treated leaves. Each concentration treatment had six replicates, with ten snails per replicate. A water-treated snail served as a control. Snail mortality was observed for 48 hours.

[0031] Mortality rate = (Number of dead insects / Total number of insects tested) × 100%

[0032] Corrected mortality rate = (treatment group mortality rate - control group mortality rate) / (1 - control group mortality rate) × 100%.

[0033] 2. Determination of stomach toxicity activity against snails by leaf dipping method

[0034] The test agents ferrous lactate and ferric orthophosphate were diluted with sterile water to five concentration gradients: 5, 10, 20, 40, and 80 mg / mL. Fresh lettuce leaves were cut into 10cm × 15cm square leaf discs, and immersed in the different concentrations of the agents for 10-15 seconds. After being removed, they were placed in a ventilated place to air dry naturally, and then placed in a rearing box with moistened absorbent cotton. Leaves treated with sterile water served as a control. Ten snails that had been starved for 24 hours were introduced into each treatment, and the treatment was repeated three times. All treatments were reared and observed under conditions of (25±1)℃, (75±5)% relative humidity, and a photoperiod of L:D = (14:10) h. The mortality of the test insects was checked 48 hours after treatment. Adult insects were disturbed with tweezers or other hard objects; if there was no reaction, they were considered dead.

[0035] Mortality rate = (Number of dead insects / Total number of insects tested) × 100%

[0036] Corrected mortality rate = (treatment group mortality rate - control group mortality rate) / (1 - control group mortality rate) × 100%.

[0037] 3. Determination of attraction effect

[0038] Referring to Jiang Lin's graduation thesis, a device for enticing behavior was created using the principle of a four-armed olfactory sensor (e.g., Figure 1The apparatus consisted of a central transparent plastic insect release area, surrounded by two treatment groups and two control groups arranged in a staggered pattern. Activity channels (d = 2.0 cm) were set along the four zones, connecting activated carbon, a humidifier, and an airflow meter from far to near. An opening at the top of the insect release area connected to a vacuum pump. Sufficient snails were selected and starved in rearing boxes for 24 hours. Different concentrations of ferrous lactate and ferric phosphate were sprayed onto absorbent cotton and placed in the two treatment zones, while absorbent cotton sprayed with sterile water was placed in the control group. The vacuum pump was turned on, with an airflow rate of 100 mL / min. -1 After 5 minutes of ventilation, the starved slugs were introduced into the release area. Each group was repeated 3 times, with 20 slugs tested in each repetition. The number of slugs in each treatment chamber was recorded after 24 hours.

[0039] Response rate (%) = [Number of insects in treatment area / (Number of insects in treatment area + Number of insects in control area)] × 100%

[0040] Selection coefficient = (Number of insects in the treatment area - Number of insects in the control area) / (Number of insects in the treatment area + Number of insects in the control area)

[0041] Results and Analysis:

[0042] Touch kill effect:

[0043] Table 1

[0044]

[0045]

[0046] Table 1 shows that ferric orthophosphate and ferrous lactate have virtually no contact-killing activity against snails at low concentrations. While the mortality rate of snails treated with both agents increased slightly with increasing concentration, the increase was not significant. This is likely because some snails ingested the solution during the immersion process, leading to their deaths. Therefore, it can be concluded that ferric orthophosphate and ferrous lactate have no contact-killing activity against snails.

[0047] Stomach poisoning effect:

[0048] Table 2

[0049]

[0050] Table 2 shows that both ferric orthophosphate and ferrous lactate have significant gastric toxicity effects on snails, and the effect becomes more pronounced with increasing concentration, while the efficacy of the two agents is not significantly different. It was also found that snails stopped feeding after consuming leaves containing either agent. This indicates that ferrous lactate and ferric orthophosphate have similar mechanisms of action, inducing feeding cessation by interfering with calcium metabolism in the snail's intestine.

[0051] Seduction effect:

[0052] Table 3

[0053]

[0054] As can be seen from Table 3, ferric phosphate at different concentrations did not have a significant attraction effect on snails, while ferrous lactate at different concentrations had a certain attraction effect on snails, and the attraction effect gradually increased with the increase of concentration.

[0055] Conclusion: Ferrous lactate exhibits gastrotoxic activity against snails, with effects similar to ferric orthophosphate. Its mechanism of action is also similar to ferric orthophosphate, inducing cessation of feeding by interfering with calcium metabolism in the snail's intestine. However, compared to ferric orthophosphate, ferrous lactate demonstrates a stronger attraction to snails and is more compatible with them. Attached Figure Description

[0056] Figure 1 This is a simplified diagram of the indoor bioactivity assay for this invention to test the induction effect.

[0057] Figure 2 This is a process flow diagram of the present invention. Detailed Implementation

[0058] The following embodiments can help those skilled in the art to more fully understand the present invention, but should not be construed as limiting the present invention in any way.

[0059] Example 1: 10% Ferrous Lactate Slow-Release Fertilizer Granules

[0060]

[0061] Process: Metered ferrous lactate, sodium lignosulfonate, urea, talc, and tea seed cake are mixed evenly, then pulverized by airflow to obtain a master powder, which is then passed through a 300-mesh sieve. The master powder is then fed into a fluidized bed granulator. Metered flavoring agents and urea-formaldehyde are dissolved in an appropriate amount of water. During the fluidized bed granulation process, the above solution is evenly sprayed into the granulator. Once the moisture content of the granules is below 2%, the preparation is complete. The granules are then passed through a 200-mesh sieve, metered, and packaged to obtain 10% ferrous lactate slow-release fertilizer granules. The inlet temperature of the fluidized bed granulator is controlled at 75℃, the outlet temperature at 50℃, and the air velocity inside the fluidized bed granulator is controlled at 60Hz.

[0062] Example 2: 20% Ferrous Lactate Slow-Release Fertilizer Granules

[0063]

[0064]

[0065] Process: Metered ferrous lactate, naphthalenesulfonate formaldehyde condensate, ammonium nitrate, magnesium stearate, and tea seed cake are mixed evenly, then pulverized by air jet milling to obtain master powder, which is then passed through a 500-mesh sieve. The master powder is then fed into a fluidized bed granulator. Metered protein powder and urea-formaldehyde are dissolved in an appropriate amount of water. During the fluidized bed granulation process, the above solution is evenly sprayed into the fluidized bed granulator. Once the moisture content of the granules is below 2%, the preparation is complete. The granules are then passed through a 200-mesh sieve, metered, and packaged to obtain 20% ferrous lactate slow-release fertilizer granules. The inlet temperature of the fluidized bed granulator is controlled at 80℃, the outlet temperature at 55℃, and the air velocity inside the fluidized bed granulator is controlled at 65Hz.

[0066] Example 3: 1% Ferrous Lactate Slow-Release Fertilizer Granules

[0067]

[0068] Process: Metered ferrous lactate, naphthalenesulfonate formaldehyde condensate, ammonium nitrate, magnesium stearate, and tea seed cake are mixed evenly, then pulverized by air jet milling to obtain master powder, which is then passed through a 400-mesh sieve. The master powder is then fed into a fluidized bed granulator. Metered protein powder and urea-formaldehyde are dissolved in an appropriate amount of water. During the fluidized bed granulation process, the above solution is evenly sprayed into the fluidized bed granulator. Once the moisture content of the granules is below 2%, the preparation is complete. The granules are then passed through a 200-mesh sieve, metered, and packaged to obtain 20% ferrous lactate slow-release fertilizer granules. The inlet temperature of the fluidized bed granulator is controlled at 78℃, the outlet temperature at 52℃, and the air velocity inside the fluidized bed granulator is controlled at 63Hz.

[0069] Example 4: 40% Ferrous Lactate Slow-Release Fertilizer Granules

[0070]

[0071]

[0072] Process: Metered ferrous lactate, naphthalenesulfonate formaldehyde condensate, ammonium nitrate, magnesium stearate, and tea seed cake are mixed evenly, then pulverized by air jet milling to obtain master powder, which is then passed through a 300-mesh sieve. The master powder is then fed into a fluidized bed granulator. Metered protein powder and urea-formaldehyde are dissolved in an appropriate amount of water. During the fluidized bed granulation process, the above solution is evenly sprayed into the fluidized bed granulator. Once the moisture content of the granules is below 2%, the preparation is complete. The granules are then passed through a 200-mesh sieve, metered, and packaged to obtain 20% ferrous lactate slow-release fertilizer granules. The inlet temperature of the fluidized bed granulator is controlled at 78℃, the outlet temperature at 54℃, and the air velocity inside the fluidized bed granulator is controlled at 62Hz.

[0073] Example 5: 20% Ferrous Lactate Slow-Release Fertilizer Granules

[0074]

[0075] Process: First, the tea meal is pretreated as follows: 1) The tea meal is crushed and dried to obtain dry tea meal; 2) Petroleum ether is added to the dry tea meal at a rate of 3L per kilogram of tea meal, stirred, and centrifuged to obtain defatted tea meal; 3) A mixture of petroleum ether and acetone is added to the defatted tea meal at a rate of 3.5L per kilogram of defatted tea meal, stirred, and centrifuged to obtain the pretreated tea meal; the volume fraction of acetone in the petroleum ether and acetone mixture is 17%; Measured amounts of ferrous lactate, naphthalene sulfonate formaldehyde condensate, and ammonium nitrate are added. Magnesium stearate and pretreated tea meal are mixed evenly, and then the mixture is pulverized by air jet milling to obtain master powder. The master powder is then passed through a 500-mesh sieve. The master powder is then fed into a fluidized bed granulator. The metered protein powder and urea-formaldehyde are dissolved in an appropriate amount of water. During the fluidized bed granulation process, the above solution is evenly sprayed into the fluidized bed granulator. Once the moisture content of the granules is below 2%, the preparation is complete. The granules are then passed through a 200-mesh sieve, metered, and packaged to obtain 20% ferrous lactate slow-release fertilizer granules. The inlet temperature of the fluidized bed granulator is controlled at 80℃, the outlet temperature is controlled at 55℃, and the air velocity inside the fluidized bed granulator is controlled at 65Hz.

[0076] Comparative Example 1: Slow-release fertilizer granules without ferrous lactate

[0077]

[0078] Process: Metered naphthalenesulfonate formaldehyde condensate, ammonium nitrate, magnesium stearate, and tea seed cake are mixed evenly, then pulverized by air jet milling to obtain master powder, which is then passed through a 500-mesh sieve. The master powder is then fed into a fluidized bed granulator. Metered protein powder and urea-formaldehyde are dissolved in an appropriate amount of water. During the fluidized bed granulation process, the above solution is evenly sprayed into the fluidized bed granulator. Once the moisture content of the granules is below 2%, the preparation is complete. The granules are then passed through a 200-mesh sieve, metered, and packaged to obtain 20% ferrous lactate slow-release fertilizer granules. The inlet temperature of the fluidized bed granulator is controlled at 80℃, the outlet temperature at 55℃, and the air velocity inside the fluidized bed granulator is controlled at 65Hz.

[0079] Comparative Example 2: 20% Ferrous Lactate Slow-Release Fertilizer Granules

[0080]

[0081] Process: Metered ferrous lactate, naphthalenesulfonate formaldehyde condensate, ammonium nitrate, magnesium stearate, and tea seed cake are mixed evenly, then pulverized by air jet milling to obtain master powder, which is then passed through a 500-mesh sieve. The master powder is then fed into a fluidized bed granulator. Metered protein powder and urea-formaldehyde are dissolved in an appropriate amount of water. During the fluidized bed granulation process, the above solution is evenly sprayed into the fluidized bed granulator. Once the moisture content of the granules is below 2%, the preparation is complete. The granules are then passed through a 200-mesh sieve, metered, and packaged to obtain 20% ferrous lactate slow-release fertilizer granules. The inlet temperature of the fluidized bed granulator is controlled at 80℃, the outlet temperature at 55℃, and the air velocity inside the fluidized bed granulator is controlled at 65Hz.

[0082] Biometrics verification:

[0083] Test reagent: 10% ferrous lactate slow-release fertilizer granules prepared in Example 1;

[0084] Example 2: 20% ferrous lactate slow-release fertilizer granules;

[0085] Example 3: 1% ferrous lactate slow-release fertilizer granules;

[0086] Example 4 shows the preparation of 40% ferrous lactate slow-release fertilizer granules;

[0087] Example 5 shows the preparation of 20% ferrous lactate slow-release fertilizer granules;

[0088] Comparative Example 1: A granular fertilizer containing only tea seed meal carrier and no ferrous lactate.

[0089] Comparative Example 2: 20% ferrous lactate granules with diatomaceous earth as a carrier.

[0090] The dosage is 4 g·m 2.

[0091] Field trial design and treatment: Experiments were conducted on seedbeds of *Dendrobium officinale* with uniform growth and significant snail infestation, with each plot measuring 5m². 2 Each treatment was repeated 3 times, plus a blank control, for a total of 4 treatments, 12 plots, and arranged in randomized blocks.

[0092] Survey method: Five points were randomly sampled from each plot, and the number of snails on the soil surface and surrounding soil of four Dendrobium officinale plants at each point was investigated. Before application of the pesticide, the baseline number of snails in each plot was investigated. After application, the number of live snails on the soil surface and plants of each group was investigated at 1, 5, and 8 days after application.

[0093] Data processing: Insect population reduction rate / % = (Number of live insects before application - Number of live insects after application) / Number of live insects before application × 100 Control efficacy / % = (Insect population reduction rate in the treated area - Insect population reduction rate in the control area) / (100 - Average insect population reduction rate in the control area) × 100.

[0094] Results and Analysis

[0095] The experimental results are shown in Table 4 below:

[0096] Table 4

[0097]

[0098]

[0099] Experimental results show that the 20% ferrous lactate slow-release fertilizer granules prepared in Example 2 above can effectively control snails in Dendrobium officinale, and can achieve a sustained and long-lasting control effect, which is better than using 20% ​​ferrous lactate granules alone (with diatomaceous earth as the carrier). The fertilizer granules containing only tea seed cake as the carrier were the least effective, possibly because the tea seed cake has a low content of tea saponins, which is insufficient to achieve the desired control effect.

[0100] The ferrous lactate slow-release fertilizer granules prepared in Example 2 and Example 5 were used to conduct ferrous lactate oxidation experiments. The experimental conditions were as follows: the ferrous lactate slow-release fertilizer granules prepared in Example 2 and Example 5 were placed on soil with a humidity of 95% and exposed to 24 hours of light per day at a light intensity of 20,000 Lex for 30 days. After the slow-release fertilizer granules were removed, the oxidation of ferrous lactate was observed and compared. It was found that the ferrous lactate in the ferrous lactate slow-release fertilizer granules prepared in Example 5 was not oxidized, while a small amount of ferrous lactate in the ferrous lactate slow-release fertilizer granules prepared in Example 2 was oxidized. It can be seen that pretreatment of tea meal can reduce the oxygen and water absorption properties of tea meal, further delay the oxidation of ferrous lactate in the fertilizer granules, increase the stability of the fertilizer granules, and extend the snail control time.

[0101] Therefore, this invention provides a granular pesticide and fertilizer for snail control, and its preparation method. By combining ferrous lactate and tea seed cake, it achieves a synergistic effect in snail control, overcoming the problems of water pollution caused by metaldehyde in snail control, the accumulation of heavy metals in EDTA when using a mixture of EDTA iron sodium and ferric phosphate, the short duration of efficacy of tea seed cake soaked in aqueous solution, and the slow onset and poor control effect of dry application of tea seed cake. It features an ultra-long control time and excellent snail control effect. Furthermore, ferrous lactate provides trace element iron to vegetation in the soil, and the fermented tea seed cake in the soil improves soil and promotes crop growth, thus acting as both a fertilizer and a biological pesticide. The effectiveness of this granular pesticide and fertilizer is significant. The main ingredient is ferrous lactate, added at a rate of 1%-40%. Ferrous lactate has effective stomach poisoning and attraction effects on snails. This fertilizer granule uses tea seed cake as the fertilizer carrier, which can be completely degraded into soil nutrients, achieving the effect of enriching and improving the soil. Simultaneously, the tea saponins contained in tea seed cake have a certain control effect on snails, while the crude protein, crude fat, and oils it contains have a good affinity for snails. In addition to the attraction and affinity of ferrous lactate to snails, this fertilizer granule also contains aromatic attractants, which have a very strong affinity for snails. The attractant is mixed with the capsule wall, and a spray film-forming method is used during the fluidized bed granulation process, resulting in good slow-release performance and an ultra-long control time. This fertilizer granule can be applied to crops such as cabbage, bok choy, and Dendrobium officinale to control snails through broadcasting.

[0102] Although the present invention has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A granule of a nematicidal fertilizer, characterized by: The snail control agent fertilizer granules comprise the following components by weight percentage: ferrous lactate 1-40%, attractant 0.1-2.0%, slow-release material 0.1-3.0%, auxiliary agent 3-22%, and the rest is tea seed cake; the slow-release material is urea-formaldehyde; The tea seed cake is pretreated by the following method: 1) crushing and airing the tea seed cake to obtain dried tea seed cake; 2) adding petroleum ether to the dried tea seed cake, stirring, and centrifuging to obtain defatted tea seed cake; 3) adding a petroleum ether-acetone mixture to the defatted tea seed cake, stirring, and centrifuging to obtain the pretreated tea seed cake; the volume fraction of acetone in the petroleum ether-acetone mixture is 15-20%.

2. The granules according to claim 1, characterized in that: The attractant is one or more of flavoring substances, vermicelli, milk powder, egg white powder, condensed milk, and milk powder.

3. The granules according to claim 1, wherein the granules are a fertilizer granule for controlling snails. The auxiliary agent comprises a lubricant, a dispersant, and a disintegrant.

4. The granules according to claim 3, wherein the granules are a fertilizer granule for controlling snails. The lubricant is talc or magnesium stearate; the addition amount of the lubricant is 0-2%.

5. The granules according to claim 3, wherein the granules are a fertilizer granule for controlling snails. The dispersant is one or more of sodium lignosulfonate, calcium lignosulfonate, sodium dodecylbenzenesulfonate, naphthalene sulfonate formaldehyde condensate, and solid polycarboxylate; the addition amount of the dispersant is 3-10%.

6. The granules according to claim 3, wherein the granules are a fertilizer granule for controlling snails. The disintegrant is one or more of urea, ammonium sulfate, potassium sulfate, ammonium nitrate, potassium nitrate, starch, and sodium carboxymethylcellulose; the addition amount of the disintegrant is 0-10%.

7. A method for preparing the molluscicide fertilizer granules according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: (1) weighing the components of the snail control agent fertilizer granules according to weight percentage; (2) preparing a mother powder by mixing ferrous lactate, auxiliary agent, and tea seed cake and then airflow milling to obtain the mother powder; (3) preparing a binder substitute liquid by dissolving the attractant and urea-formaldehyde in water and mixing to obtain the binder substitute liquid; (4) fluidizing the mother powder in a fluidized state in a fluidized bed granulator, spraying the binder substitute liquid to make the powder coagulate and granulate, sieving and packaging after the water content of the granules is less than 2wt%, to obtain the snail control agent fertilizer granules.

8. A method of preparing a molluscicide fertilizer granule according to claim 7, characterized in that: The mother powder in step (2) is sieved through a 300-500 mesh sieve before being fed into the fluidized bed granulator in step (4).

9. The method for preparing a granular medicated fertilizer for snail control according to claim 7, characterized in that: The inlet temperature of the fluidized bed granulator in step (4) is controlled at 75-80℃, the outlet temperature is controlled at 50-55℃, and the wind speed in the fluidized bed granulator is controlled at 60-65Hz.

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