Aviation spray auxiliary agent for improving rain wash resistance of plant protection fog drops and application of aviation spray auxiliary agent

Abstract

The invention discloses an aviation spray auxiliary agent for improving the rain wash resistance of plant protection fog drops and application of the aviation spray auxiliary agent. The invention provides a composition for plant protection aviation spraying. The composition comprises sodium dodecyl benzene sulfonate and polyethylene glycol monostearate. The invention also provides a plant protection aviation spray auxiliary agent which comprises the composition. The plant protection aviation spray auxiliary agent provided by the invention can significantly improve the rain wash resistance of fog drops on crop leaves during aviation pesticide application, thereby solving the key problems that the window period of pesticide application in rainy seasons in the south is short, and the pesticide liquid is very easy to wash away by rain water due to frequent heavy rainfall.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of pesticide adjuvants, and particularly relates to an aviation spraying adjuvant for improving rain washing resistance of plant protection mist droplets and application thereof. BACKGROUND

[0002] The rain season in southern China lasts for a long time, and continuous rainfall for several weeks or even months often occurs. Frequent rainfall leads to a very short "window period" suitable for pesticide application. In order to seize the limited opportunity for pesticide application, the use of unmanned aerial vehicles for aerial pesticide application has become the main choice of farmers in southern China during the rainy season.

[0003] The southern rainy season is often accompanied by short-term heavy rain, and the high temperature and high humidity environment unique to the south makes the pesticides or fertilizers sprayed on crops easily washed away by rainwater. Rain washing not only directly removes the pesticide, but also accelerates the degradation and inactivation of the pesticide in the environment under high temperature and high humidity, greatly reducing the control effect and putting higher requirements on the performance of the pesticide solution.

[0004] In order to improve the rain washing resistance of pesticides, the usual method is to add a spraying adjuvant to the pesticide to enhance the adhesion and retention of the pesticide on the plant surface, improve the wetting and penetration of the pesticide on the leaf surface, and some adjuvants can also form a protective waterproof film on the leaf surface.

[0005] However, there are very few functional aviation spraying adjuvant products on the market that are specifically designed to improve the rain washing resistance of pesticides. Farmers and aerial pesticide application service providers usually have to rely on existing general-purpose tank-mix adjuvants (such as products with modified vegetable oil as the main component) to try to improve rain washing resistance. Although such modified vegetable oil adjuvants usually have good spreading and wetting properties, which help the pesticide solution to be evenly distributed on the leaves, they are difficult to form a protective film on the leaf surface that is strong and durable, or the film formed is often fragile or not continuous, and the rain washing resistance is improved to a limited extent, which cannot effectively solve the problem of rapid loss of pesticide solution in bad weather.

[0006] Therefore, the present application is proposed. SUMMARY

[0007] The present application aims to provide an aviation spraying adjuvant to significantly improve the rain washing resistance of mist droplets on crop leaves during aerial pesticide application, thereby solving the key problem of short application window period and frequent heavy rain leading to rapid loss of pesticide solution in the rainy season in southern China.

[0008] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows: In a first aspect, the present application provides a composition for plant protection aerial spraying, comprising the following components: sodium dodecyl benzene sulfonate and polyethylene glycol monostearate. The mass ratio of sodium dodecylbenzenesulfonate to polyethylene glycol monostearate is 1:(0.4-2.1).

[0009] The composition comprises sodium dodecylbenzenesulfonate and polyethylene glycol monostearate in a mass ratio of 1:(1.9-2.1). Specifically, the mass ratio may be 1:2.04.

[0010] The composition comprises sodium dodecylbenzenesulfonate and polyethylene glycol monostearate in a mass ratio of 1:(0.4-0.6). Specifically, the mass ratio may be 1:0.53.

[0011] The composition comprises sodium dodecylbenzenesulfonate and polyethylene glycol monostearate in a mass ratio of 1:(1.1-1.2). Specifically, the mass ratio may be 1:1.19.

[0012] In a second aspect, the present invention provides an aerial spraying adjuvant for plant protection, comprising the aforementioned composition.

[0013] The sodium dodecylbenzenesulfonate has a mass fraction of 14-20%, and the polyethylene glycol monostearate has a mass fraction of 10-30%.

[0014] Thirdly, the present invention provides a plant protection aerial spray solution, comprising the following components: difenoconazole suspension and the aforementioned plant protection aerial spray adjuvant.

[0015] The mass ratio of the difenoconazole suspension to the plant protection aerial spray adjuvant is 1:1.

[0016] In the difenoconazole suspension, the mass fraction of difenoconazole is 9-11%, specifically 10%.

[0017] The mass fraction of the plant protection aerial spray solution is 0.5-1.0%.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are: This invention innovatively combines two key components, sodium dodecylbenzenesulfonate and polyethylene glycol monostearate, to synergistically leverage their respective advantages.

[0019] Sodium dodecylbenzenesulfonate, as an anionic surfactant, has excellent wetting, emulsifying, and dispersing properties, ensuring that the pesticide solution adheres evenly and firmly to the leaves. It significantly improves the wetting and spreading of the pesticide solution on the plant leaf surface, enhances the adhesion of the pesticide droplets, and thus improves the uniformity of pesticide coverage on the crop surface.

[0020] Polyethylene glycol monostearate, as a nonionic surfactant, has good film-forming properties. It can form a relatively continuous film on the surface of plant leaves, like a "raincoat," to help encapsulate and fix the active ingredients of pesticides and reduce the loss caused by direct rinsing from rainwater.

[0021] This compound formulation simultaneously improves the wettability, adhesion, and film-forming properties of the pesticide solution on the leaf surface, thereby comprehensively and significantly enhancing the solution's resistance to rain washout and ensuring the effectiveness and efficiency of aerial spraying during the rainy season. Attached Figure Description

[0022] Figure 1 The flight route map and sampling point layout diagram of the agricultural drone for spraying adjuvants provided in this invention are for the purpose of implementing this invention.

[0023] Figure 2 This invention is a self-made simulated indoor flushing device. Detailed Implementation

[0024] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to the following embodiments.

[0025] Unless otherwise specified, the experimental methods used in the following examples are conventional methods.

[0026] Unless otherwise specified, all reagents, materials, instruments, etc. used in the following examples are commercially available.

[0027] The reagents used in the following examples are from the following sources: Sodium dodecylbenzenesulfonate, purchased from Shandong Keyuan Biochemical Co., Ltd., with a purity of 95%.

[0028] Polyethylene glycol monostearate (PEG-150): a derivative of polyethylene glycol (PEG), which is the product generated by the esterification reaction of polyethylene glycol and stearic acid; where PEG-150 refers to the average degree of polymerization of ethylene oxide in the polyethylene glycol segments; purchased from Kao Corporation of Japan, with a purity of 99.9%.

[0029] Example 1 Formula: By mass fraction, 18.95% sodium dodecylbenzenesulfonate + 10% polyethylene glycol monostearate (PEG-150) + 71.05% water. The mass ratio of the two is 1:0.53.

[0030] Example 2 Formula: By mass fraction, 16.84% sodium dodecylbenzenesulfonate + 20% polyethylene glycol monostearate (PEG-150) + 63.16% water. The mass ratio of the two is 1:1.19.

[0031] Example 3 Formula: By mass fraction, 14.73% sodium dodecylbenzenesulfonate + 30% polyethylene glycol monostearate (PEG-150) + 55.27% water. The mass ratio of the two is 1:2.04.

[0032] Comparative Example 1 Formula: 14.73% sodium dodecylbenzenesulfonate + 85.23% water by mass fraction.

[0033] Comparative Example 2 Formula: 30% polyethylene glycol monostearate (PEG-150) + 70% water by mass fraction.

[0034] Comparative Example 3 Formula: By mass fraction, 14.73% sodium dodecylbenzenesulfonate + 30% fatty alcohol (Shandong Keyuan Biochemical Co., Ltd.) + 55.27% water.

[0035] Comparative Example 4 Formula: By mass fraction, 14.73% sodium dodecylbenzenesulfonate + 30% methylated vegetable oil (Suzhou Fengbei Biotechnology Co., Ltd.) + 55.27% water.

[0036] Comparative Example 5 Formula: By mass fraction, 14.73% sodium dodecylbenzenesulfonate + 30% palmitoleic acid (Suzhou Fengbei Biotechnology Co., Ltd.) + 55.27% water.

[0037] Effect Test 1: Indoor simulated rainwater washing test on lychee leaves Cut lychee leaves into 1cm×3cm strips, avoiding the veins, and attach them to the center of a glass slide using double-sided tape. Add the additive products of the three examples and five comparative examples to a 1% (by mass) 1% (by mass) dilution of 10% difenoconazole suspension.

[0038] 1% difenoconazole without added adjuvants was used as a control.

[0039] Operating steps: Use a pipette to transfer 10 drops of the above 9 kinds of drug solutions onto the center of the leaf. After the drug solutions on the leaf have dried, place it in a self-made simulated indoor flushing device. Figure 1 The slide was tilted horizontally at 45°. The leaf was rinsed with deionized water from a 50 mL burette, followed by rinses with 10 mL, 10 mL, 30 mL, 50 mL, and 50 mL of deionized water respectively. The outlet of the 50 mL burette was 20 cm vertically from the leaf. The deionized water collected after each rinse was analyzed using liquid chromatography-mass spectrometry (LC-MS) to determine the concentration of difenoconazole in the water. The percentage of the leaf solution washed away by rainwater was calculated. Each treatment was repeated three times.

[0040] Table 1. Rain erosion resistance of difenoconazole solutions on litchi leaves after various treatments.

[0041] Note: The LSD test was used in SPSS 20.0 software for significance analysis. Different lowercase letters in the same column indicate significant differences between different treatments (p<0.05). As shown in Table 1, after rinsing with 150 mL of water, the solutions from Examples 1-3 showed a certain degree of resistance to rain erosion on the litchi leaves. Among them, the solutions from Examples 1 and 3 showed significant resistance to rain erosion on the litchi leaves, with 9.69% and 6.30% of the solution being washed away, respectively, which was significantly lower than other treatment groups. Furthermore, Example 3 showed the best effect, indicating that Example 3 has good resistance to rain erosion.

[0042] Effect Test 2: Indoor simulated rainwater washing test on citrus leaves. Citrus leaves were cut into 1cm × 3cm strips, avoiding the veins, and attached to the center of a glass slide using double-sided tape. The adjuvant products from three examples and five comparative examples were added at a concentration of 1% by mass to a 1% (w / w) 10% difenoconazole suspension. A 1% difenoconazole solution without added adjuvants served as a control.

[0043] Operating procedures: Pipette 10 μL of the above 9 drug solutions onto the center of the leaf. After the solutions on the leaf have dried, place it in a self-made simulated indoor flushing device. Figure 1 The slide was tilted horizontally at 45°. The leaf was rinsed with deionized water from a 50 mL burette, followed by rinses with 10 mL, 10 mL, 30 mL, 50 mL, and 50 mL of deionized water respectively. The outlet of the 50 mL burette was 20 cm vertically from the leaf. The deionized water collected after each rinse was analyzed using liquid chromatography-mass spectrometry (LC-MS) to determine the concentration of difenoconazole in the water. The percentage of the leaf solution washed away by rainwater was calculated. Each treatment was repeated three times.

[0044] Table 2. Rain erosion resistance of difenoconazole solution on citrus leaves after various treatments.

[0045] Note: The LSD test was used in SPSS 20.0 software for significance analysis. Different lowercase letters in the same column indicate significant differences between different treatments (p<0.05). As shown in Table 2, the addition of the solutions from Examples 1 and 3 after rinsing with 150 mL of water had a significant anti-rainwater erosion effect on citrus leaves, with 17.31% and 11.09% of the solutions being washed away, respectively, which was significantly lower than other treatment groups. Furthermore, Example 3 showed the best effect, indicating that Example 3 has good anti-rainwater erosion properties.

[0046] Performance Test 3: Outdoor Fog Droplet Deposition and Rainwater Erosion Resistance Test of Agricultural Drones The field trial of Example 3 and the comparative examples investigated the deposition distribution of plant protection drone droplets in the canopy of litchi and citrus trees and the resistance of the pesticide solution on the leaves to rain washout.

[0047] 1. Materials and Methods 1.1 Instruments and Equipment The agricultural drone used in this experiment was a DJI T40 electric quadcopter agricultural drone (Shenzhen DJI Innovation Technology Co., Ltd.). Other equipment included a droplet test card (Chongqing Liuliushanxia Agricultural Protection Technology Co., Ltd.), a TH-PQX8Y portable weather station (Shandong Tianhe Environmental Technology Co., Ltd.), a liquid chromatography-mass spectrometry system (Waters, USA), an ES-60W scanner (Seiko Epson, Japan), and Examples 3, 1, 2, 3, 4, and 5 (prepared in our laboratory). 10% difenoconazole water-dispersible granules were also used (Syngenta Nantong Crop Protection Co., Ltd.; Pesticide Registration Certificate No.: PD20152176).

[0048] 1.2 Test Methods 1.2.1 Test Site and Test Crops The citrus tree experiment was conducted at the Fucheng Orange Plantation in Fushan Town, Chengmai County, Hainan Province. The trees were 9-10 years old, 1.64-1.86m tall, and planted in rows with a spacing of 5m and plants with a spacing of 4m.

[0049] 1.2.2 The effects of adding Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4, and Comparative Example 5 on the deposition and distribution of plant protection drone droplets in the citrus canopy and the resistance of the pesticide solution to rain washout on the leaves.

[0050] Operating procedures: The agricultural drone will fly along the crop planting rows. Each experimental plot is 24×30m in size, with at least 6 flight paths set up for each plot. Three trees will be randomly selected between the two middle flight paths for sampling. The sampling trees will be arranged in two layers, with 4 sampling points in each layer in the four cardinal directions (east, west, south, and north). See the flight path map and sampling point layout for details. Figure 2 The flight altitude was 3.0 m (flight altitude refers to the height of the agricultural drone above the top of the crop during operation), the speed was 2.0 m / s, the liquid volume per acre was 4.0 L, and 7 treatments were set up in the experiment.

[0051] Treatment group 1: Dilute difenoconazole 100 times; Treatment Group 2: Difenoconazole + Example 3: Dilute Example 3 100 times with the solution from Treatment Group 1; Treatment Group 3: Difenoconazole + Comparative Example 1: Comparative Example 1 was diluted 100 times with the solution from Treatment Group 1; Treatment Group 4: Difenoconazole + Comparative Example 2: Comparative Example 2 was diluted 100 times with the solution from Treatment Group 1; Treatment Group 5: Difenoconazole + Comparative Example 3: Comparative Example 3 was diluted 100 times with the solution from Treatment Group 1; Treatment Group 6: Difenoconazole + Comparative Example 4: Comparative Example 4 was diluted 100 times using the solution from Treatment Group 1; Treatment Group 7: Difenoconazole + Comparative Example 5: Comparative Example 5 was diluted 100 times with the solution from Treatment Group 1.

[0052] Before each operation, droplet test cards were prepared and meteorological station data were recorded. After the operation, the droplet test cards were packaged, sealed, and stored in the laboratory. The data were then scanned and processed using the Deposit Scan image processing software to obtain the droplet deposition density and droplet coverage. Two hours after the operation, leaves from the upper, middle, and lower layers of the tree canopy were collected. The leaves were divided into two parts: one part was immediately tested for residue, and the other part was rinsed with tap water simulating rain for 5 minutes before being tested for residue. SPSS 20.0 was used for statistical analysis of the data.

[0053] 1.2.3 Detection method for difenoconazole residues in citrus leaves (LC-MS / MS) Sample pretreatment: Take 10g of fresh leaves and cut them into small pieces. Take 2g of the chopped sample into a mortar, add 0.5g of quartz sand and grind it into powder. Transfer the ground sample to a 15mL centrifuge tube, add 20mL of acetonitrile, vortex for 5min, centrifuge at 4000r / min for 10min, and take 1.5mL of the supernatant into a 2mL centrifuge tube for purification. Add 100mg of anhydrous magnesium sulfate, 20mg of GCB (graphitized carbon black) and 40mg of PSA ((ethylenediamine-N-propyl)), vortex for 2min, centrifuge at 8000r / min for 5min, and filter the supernatant through a 0.22μm filter membrane into a sample bottle for testing.

[0054] Liquid chromatography-mass spectrometry (LC-MS) conditions: Waters BEHC18 column (2.1 × 50 mm, 1.7 μm), injection volume 1 μL; mobile phase A: 0.1% formic acid aqueous solution, mobile phase B: 0.1% formic acid acetonitrile solution; flow rate 0.30 mL / min; ion source type: ESI+; ion source temperature 500℃; multiple reaction monitoring (MRM) detection; quantitative ions: 406 / 250.9; qualitative ions: 406 / 188.0.

[0055] 2 Results and Analysis 2.1 Effects of different treatment groups on the deposition and distribution of droplets from agricultural drones on citrus fruits The deposition distribution of pesticide droplets on the citrus canopy after application by agricultural drones is shown in the table below.

[0056] Table 3. Droplet density and coverage on the upper surface of leaves in the citrus canopy.

[0057] Note: The LSD method was used to analyze the significance of differences using SPSS 20.0 software. Different lowercase letters in the same column indicate significant differences between different treatments in the same canopy (p<0.05).

[0058] As shown in the table above, adding Example 3, Comparative Example 1, and Comparative Example 4 significantly increased the droplet density of difenoconazole solution in the upper layer of the citrus canopy, with Example 3 showing a significantly higher effect than the other comparative examples. Adding Example 3 and Comparative Example 4 significantly increased the droplet density of difenoconazole solution in the lower layer of the citrus canopy, with Example 3 showing a significantly higher effect than the other comparative examples. This indicates that Example 3 can significantly increase the coverage of both the upper and lower layers of the canopy and improve the deposition efficiency of droplets from agricultural drones.

[0059] 2.2 Effects of different treatment groups on the rain erosion resistance of pesticide droplets from agricultural drones on citrus fruits The results of re-testing the residual amount of difenoconazole on the leaves after simulated rain washing are shown in the table below.

[0060] Table 4. Test of rainwater erosion resistance of fog droplets on citrus leaves

[0061] Note: The LSD method was used to analyze the significance of differences using SPSS 20.0 software. Different lowercase letters in the same column indicate significant differences between different treatments in the same canopy (p<0.05).

[0062] As shown in the table above, the deposition of pesticide solution on the upper leaves of citrus canopies significantly increased after adding Examples 3, 1, 3, 4, and 5, with Example 3 showing a significantly higher effect than the other comparative examples. Similarly, the deposition of pesticide solution on the lower leaves of citrus canopies significantly increased after adding Examples 3, 4, and 5, with Example 3 showing a significantly higher effect than the other comparative examples. After rainwater runoff, the proportion of pesticide solution from Examples 3, 1, 3, 4, and 5 that was washed away significantly decreased, indicating that Example 3 showed a significantly higher resistance to rainwater runoff than the other comparative examples, further confirming that Example 3 has excellent resistance to rainwater runoff.

[0063] 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 composition for aerial spraying of agricultural products, characterized in that, It comprises the following components: sodium dodecylbenzenesulfonate and polyethylene glycol monostearate; The mass ratio of sodium dodecylbenzenesulfonate to polyethylene glycol monostearate is 1:(0.4-2.1).

2. The composition according to claim 1, characterized in that, It is composed of sodium dodecylbenzenesulfonate and polyethylene glycol monostearate in a mass ratio of 1:(1.9-2.1).

3. The composition according to claim 1, characterized in that, It is composed of sodium dodecylbenzenesulfonate and polyethylene glycol monostearate in a mass ratio of 1:(0.4-0.6).

4. The composition according to claim 1, characterized in that, It is composed of sodium dodecylbenzenesulfonate and polyethylene glycol monostearate in a mass ratio of 1:(1.1-1.2).

5. A crop protection aerial spraying adjuvant, characterized in that, The composition comprising any one of claims 1-4.

6. The plant protection aerial spraying adjuvant according to claim 5, characterized in that, The sodium dodecylbenzenesulfonate has a mass fraction of 14-20%, and the polyethylene glycol monostearate has a mass fraction of 10-30%.

7. A plant protection aerial spray solution, characterized in that, It comprises the following components: difenoconazole suspension and the plant protection aerial spraying adjuvant as described in claim 5 or 6.

8. The plant protection aerial spray solution according to claim 7, characterized in that, The mass ratio of the difenoconazole suspension to the plant protection aerial spray adjuvant is 1:

1.

9. The plant protection aerial spray solution according to claim 7, characterized in that, In the difenoconazole suspension, the mass fraction of difenoconazole is 9-11%.

10. The plant protection aerial spray solution according to claim 7, characterized in that, The mass fraction of the plant protection aerial spray solution is 0.5-1%.

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