A forest herbicide containing terbuthylazine and hexazinone

Abstract

The present invention belongs to the technical field of chemical herbicides, and in particular to a forest herbicide comprising terbuthylazine and hexazinone. The present invention provides a forest herbicide comprising terbuthylazine and hexazinone, wherein the raw material composition comprises terbuthylazine powder and hexazinone-gelatin powder, wherein the particle size of the terbuthylazine powder is 0.8-1.2 mm, and the particle size of the hexazinone-gelatin powder is 2.0-2.5 mm, so that: 1. when the forest herbicide is first sprayed on herbs and vine weeds, the gelatin is heated and melted relatively slightly, and the hexazinone is released, thereby ensuring that the herbs and vine weeds obtain the forest herbicide active ingredient with a suitable ratio and a relatively low viscosity, allowing the weed roots to fully absorb the herbicide; 2. when the forest herbicide is later sprayed on non-target trees, the gelatin is heated and melted relatively significantly, and the hexazinone is released, thereby ensuring that the target trees obtain the forest herbicide active ingredient with a relatively high viscosity, allowing the tree stems and leaves to fully absorb the herbicide.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical herbicides, and in particular relates to a forest herbicide containing terbuthylazine and hexazinone. Background Art

[0002] The biggest difference between forest weeding operations and weeding operations in corn fields, wheat fields, etc. is that the "weeds" in the forest include not only various shorter herbs and vines, but also taller non-target trees.

[0003] Therefore, weeding operations in cornfields, wheat fields, and other areas generally require only a single herbicide formulation. However, weeding in forests requires both spraying upwards to target non-target trees and spraying downwards to target various shorter weeds. More importantly, the herbicide formulations suitable for non-target trees and shorter weeds vary significantly. Even with the same herbicide type, the weight ratio can vary significantly. Therefore, herbicides with a fixed composition are not suitable for the relatively complex weeding operations in forests.

[0004] Among them, the above-mentioned non-target trees refer to, for example, poplars and willows in Metasequoia forests, and the relatively common elm in Korean pine forests.

[0005] On the other hand, terbuthylazine and hexazinone are two common herbicides. While both have their shortcomings, they also have their own strengths in weed control. It is generally believed that terbuthylazine is primarily absorbed through the roots, providing excellent broad-spectrum control against annual weeds. Hexazinone, on the other hand, is primarily absorbed through the stems and leaves. Even when applied to the roots, it is transported through the xylem to the stems and leaves before taking effect. Its specialty is killing some perennial weeds and most common trees. Therefore, commercially available forest herbicides generally contain terbuthylazine and hexazinone as their raw materials.

[0006] For example, a Chinese invention patent with patent publication number CN104082308A and publication date 2014.10.08 discloses a herbicidal composition containing terbuthylazine and hexazinone and its application. The composition contains terbuthylazine and hexazinone as active ingredients in a mass ratio of 1-90:1-90.

[0007] The advantages of the herbicide composition in this invention patent are: it has significant synergistic effects, is suitable for controlling a variety of weeds in corn fields, can significantly reduce the amount of medicine used, expand the scope of prevention and control, save economic costs, and at the same time can also reduce the residual amount of the agent in agricultural products and the environment, and delay the development of weed resistance.

[0008] However, when the herbicidal composition is used in forest weeding operations, it still has at least the following two shortcomings, which are also the technical problems to be solved by the present invention, namely:

[0009] First, it can only provide a fixed ratio of terbuthylazine to hexazinone when targeting non-target trees and shorter weeds. This results in excessive terbuthylazine content on non-target trees, making targeted use less effective. On shorter weeds, a relatively large amount of hexazinone, also with poor targeting, appears, significantly reducing the efficiency of weed control.

[0010] Second, it can only provide one viscosity performance when facing non-target trees and shorter weeds respectively. However, hexazinone requires a relatively large viscosity on non-target trees to ensure that the stems and leaves can fully absorb it, while terbuthylazine requires a relatively small viscosity on shorter weeds, requiring the herbicide to drip quickly. Because terbuthylazine is mainly absorbed by the roots, this herbicidal combination is still not suitable.

[0011] Therefore, in summary, there is an urgent need for a new type of terbuthylazine-hexazinone herbicide that can provide different raw material ratios and different viscosities on non-target trees and shorter weeds, so as to be used in relatively complex and difficult forest weeding operations. Summary of the Invention

[0012] The present invention provides a forest herbicide containing terbuthylazine and hexazinone. The raw materials of the forest herbicide include terbuthylazine powder and hexazinone-gelatin powder. The particle size of the terbuthylazine powder is 0.8-1.2 mm, and the particle size of the hexazinone-gelatin powder is 2.0-2.5 mm. The forest herbicide has the following characteristics: 1. When the forest herbicide is first sprayed on herbs and vines, the gelatin is heated and melted relatively slightly to release the hexazinone, thereby ensuring that the herbs and vines obtain active ingredients of the forest herbicide in an appropriate proportion and with a relatively low viscosity, allowing the roots of the weeds to fully absorb the herbicide; and 2. When the forest herbicide is subsequently sprayed on non-target trees, the gelatin is heated and melted relatively significantly to release the hexazinone, thereby ensuring that the target trees obtain active ingredients of the forest herbicide in an appropriate proportion and with a relatively high viscosity, allowing the stems and leaves of the trees to fully absorb the herbicide.

[0013] The technical solution adopted by the present invention to solve the above-mentioned problem is: a forest herbicide containing terbuthylazine and hexazinone, the raw materials of which include terbuthylazine powder for forming a herbicide liquid suspension, and hexazinone-gelatin powder for forming a herbicide liquid precipitate and used after the herbicide liquid is heated. The particle size of the terbuthylazine powder is 0.8-1.2 mm, and the particle size of the hexazinone-gelatin powder is 2.0-2.5 mm.

[0014] In the present invention, based on the actual situation that the killing effect of herbaceous and vine weeds is mainly terbuthylazine and supplemented by hexazinone, and the killing effect of non-target trees is mainly hexazinone and supplemented by terbuthylazine, the forest herbicide is configured as follows: terbuthylazine is uncoated and the coated hexazinone takes effect later, thereby ensuring that herbs and vines, as well as non-target trees, can be killed in a differentiated and targeted manner by a single herbicide.

[0015] This has a huge efficiency advantage compared to the existing two-step preparation method that requires more terbuthylazine and less cyclazinone, and more cyclazinone and less terbuthylazine.

[0016] More importantly, the gelatin added to allow for the late-acting cyclohexanone can greatly increase the viscosity of the herbicide solution when spraying on non-target trees, allowing the cyclohexanone to remain on the stems and leaves of non-target trees for a relatively long time, thus avoiding the relatively inefficient process of cyclohexanone being first absorbed by the roots of non-target trees and then returning to the stems and leaves through the xylem. This is very clever.

[0017] In the post-effectiveness process of hexazinone, the core control methods are two:

[0018] First, when the hexazinone-gelatin powder does not melt the gelatin, it is a precipitate that the spray device cannot suck out and use, and will directly block the filter of the spray device. Of course, the position of the spray device's suction pipe mouth cannot be too low at this time;

[0019] Second, gelatin has a clear melting temperature range. By controlling the appropriate heating temperature, when spraying herbaceous and vine weeds, the hexazinone-gelatin powder needs to melt a small amount of gelatin to release a small amount of hexazinone, thereby ensuring that the optimal synergistic weed control effect of terbuthylazine as the main agent and hexazinone as the auxiliary agent can be achieved on monocotyledonous and dicotyledonous weeds and annual and perennial weeds. Conversely, hexazinone as the main agent and terbuthylazine as the auxiliary agent is required for non-target trees.

[0020] A further preferred technical solution is that: in the hexazinone-gelatin powder, the molecular weight of gelatin is 55,000-80,000, and the weight of gelatin is 12-18% of the weight of hexazinone.

[0021] In the present invention, if the molecular weight of gelatin is lower than 55,000, the range of its melting temperature will be relatively small, increasing the difficulty of temperature control of the spraying device. If its molecular weight is higher than 80,000, the viscosity of the herbicide liquid will be too high when it is later used on non-target trees, increasing the difficulty of herbicide spraying, which is also undesirable. Therefore, the above molecular weight range is determined.

[0022] Similarly, if the gelatin content in the hexazinone-gelatin powder is too low, the hexazinone post-action effect cannot be clearly achieved, and the herbicide is prone to inefficient waste due to a relatively high hexazinone content on herbaceous and climbing weeds. If the gelatin content is too high, the final herbicide liquid will also have excessive viscosity, affecting the normal herbicide spraying and dripping effect.

[0023] A further preferred technical solution is that the weight of the terbuthylazine powder is 2.5-3.5 times the weight of the hexazinone-gelatin powder.

[0024] In this invention, terbuthylazine has a relatively broad-spectrum weed control effect, while hexazinone has the advantage of targeted killing of non-target trees, complementing terbuthylazine's weakness against monocotyledonous and perennial weeds. Therefore, in the forest herbicide, terbuthylazine should be the primary agent, with hexazinone as a supplement.

[0025] In reality, the weed composition in plantations of various economic trees is generally a coexistence of non-target trees and shorter weeds, with the former in small quantities and the latter in large quantities. However, the competition between non-target trees and target economic trees is greater, and they must be removed.

[0026] A further preferred technical solution is that the preparation method of the hexazinone-gelatin powder comprises the following steps in sequence:

[0027] S1. Gelatin melting: Add gelatin blocks to a stirred tank, heat the gelatin blocks to 34-36°C, and maintain for 5-8 minutes to obtain gelatin solution;

[0028] S2. Hexazinone mixing: keeping the temperature of the gelatin solution constant, adding hexazinone to the gelatin solution while stirring, and stirring and mixing for 5-10 minutes to obtain a mixture;

[0029] S3, cooling and solidifying: discharging the mixture into a mold, and then cooling and solidifying at room temperature to obtain a mixed block;

[0030] S4. Low-temperature milling and pulverizing: The mixed mass is added to a mill and subjected to a low-temperature milling operation until the passing rate of the pulverized material through an 8-mesh sieve reaches 70%, and finally the hexazinone-gelatin powder is obtained in the mill.

[0031] A further preferred technical solution is that in S3, a release agent is pre-coated on the inner wall of the mold, and when the room temperature is higher than 25°C, the mold is cooled so that the temperature of the mold is 10-18°C.

[0032] In the present invention, the release agent can ensure that the mixed block can be smoothly removed from the mold to avoid significant sticking to the mold. The release agent is methyl silicone oil.

[0033] In addition, the above-mentioned cooling operation can be performed in a water bath.

[0034] A further preferred technical solution is that in S4, the material temperature of the low-temperature crushing operation is 15-20°C.

[0035] In the present invention, if the mixed mass is crushed at a relatively high temperature, the gelatin will easily melt again and stick to the mill, which needs to be avoided. Therefore, the low temperature condition of the crushing operation is set to 15-20°C.

[0036] A further preferred technical solution is that the method for using the forest herbicide comprises the following steps in sequence:

[0037] T1. Preparing a herbicide liquid: Adding the forest herbicide and water to a heated and stirred pesticide spraying vehicle to prepare a suspension of the herbicide liquid;

[0038] T2. Spraying herbaceous and climbing weeds: Turn on the heating and stirring functions of the pesticide sprayer to begin melting the gelatin portion of the hexazinone-gelatin powder for spraying herbaceous and climbing weeds with terbuthylazine as the main component and hexazinone as the auxiliary component;

[0039] T3. Spraying non-target trees: increasing the heating temperature of the pesticide spraying vehicle to melt all the gelatin in the hexazinone-gelatin powder, and spraying the non-target trees with hexazinone as the main component and terbuthylazine as the auxiliary component;

[0040] T4. Turn off the pesticide spraying vehicle: spray the remaining herbicide liquid on all non-target trees, turn off the heating and stirring actions of the pesticide spraying vehicle, and the entire use method is completed.

[0041] In the present invention, the existing pesticide sprayer has at least the functions of liquid stirring, liquid heating, and a spraying structure with adjustable pitch angle, ensuring that in economic forest plantations where herbaceous vine weeds and non-target trees coexist, the herbaceous vine weeds and non-target trees can be sprayed with herbicides in a targeted and sequential manner.

[0042] In addition, in T1, the suspension refers to the suspended material being terbuthylazine and the precipitated material being hexazinone-gelatin powder. The latter is released after being heated and the gelatin melts, which is also a suspended substance.

[0043] Of course, it should be noted that the nozzle of the liquid pipe of the pesticide spraying vehicle may be blocked by hexazinone-gelatin powder. There are two ways to deal with it:

[0044] First, increase the stirring speed appropriately to allow the water flow to continuously impact the nozzle position to avoid clogging the material;

[0045] Second, the nozzle should not touch the bottom. It should be properly lifted away from the area with a large amount of cyclazinone-gelatin powder sediment at the bottom. When spraying non-target trees, the gelatin has all melted. At this time, the nozzle can be lowered to touch the bottom directly.

[0046] A further preferred technical solution is that: in T1, the weight ratio of the forest herbicide to water is 1:(200-300).

[0047] A further preferred technical solution is that in T2, the temperature of the herbicide liquid is 36-38°C, and the viscosity at 25°C is 18-22 cps.

[0048] In the present invention, the relatively low temperature of the herbicide solution can cause the hexazinone-gelatin powder in the precipitate state to partially melt the gelatin and release hexazinone, allowing the hexazinone to enter the upper suspension. In this way, a "terbuthylazine as the main agent and hexazinone as the auxiliary agent" approach is used to achieve more targeted control of herbaceous and vine weeds.

[0049] In addition, the herbicide liquid contains a relatively small amount of gelatin and has a relatively low viscosity, which allows the herbicide liquid to fall into the soil relatively quickly and be absorbed by the roots of herbaceous and vine weeds, thereby preventing and controlling herbaceous and vine weeds. This is relatively consistent with the method of effectiveness of terbuthylazine.

[0050] A further preferred technical solution is that in T3, the temperature of the herbicide liquid is 40-45°C, and the viscosity at 25°C is 30-35 cps.

[0051] In the present invention, the relatively high temperature of the herbicide liquid at this time can cause all the remaining hexazinone-gelatin powder in the precipitate state to melt the gelatin and release hexazinone. At this time, the herbicide liquid is a suspension system with hexazinone as the main component and terbuthylazine as the auxiliary component, and the viscosity is also relatively high. This is also consistent with the effective characteristic of hexazinone being absorbed by the stems and leaves, ensuring that non-target trees can be fully controlled.

[0052] The "terbuthylazine supplement" approach is achieved through residual spraying during the initial application. In other words, there's a rough limit on how the herbicide solution is distributed between herbaceous and vine weeds and non-target trees. At the very least, during the initial application, the entire solvent and suspended solids cannot be sprayed out. DETAILED DESCRIPTION

[0053] The following description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0054] Example 1

[0055] A forest herbicide containing terbuthylazine and hexazinone, the raw materials of which include:

[0056] 90 parts of terbuthylazine powder,

[0057] 30 parts of hexazinone-gelatin powder,

[0058] 2 parts of sodium fatty alcohol sulfonate dispersant,

[0059] 1 part of dibutylnaphthalene sulfonate wetting agent,

[0060] 2 parts of Tween 80 emulsifier.

[0061] The particle size of the terbuthylazine powder is 0.8-1.0 mm, and the particle size of the hexazinone-gelatin powder is 2.1-2.5 mm.

[0062] The molecular weight of gelatin in the hexazinone-gelatin powder is 60,000-65,000, and the weight of gelatin is 15% of the weight of hexazinone.

[0063] In addition, the preparation method of the hexazinone-gelatin powder comprises the following steps in sequence:

[0064] S1. Gelatin melting: Add gelatin blocks to a stirred tank, heat the gelatin blocks to 34° C., and maintain for 6 minutes to obtain gelatin solution;

[0065] S2. Hexazinone mixing: keeping the temperature of the gelatin solution constant, adding hexazinone to the gelatin solution while stirring, and stirring and mixing for 6 minutes to obtain a mixture;

[0066] S3, cooling and solidifying: discharging the mixture into a mold, and then cooling and solidifying at room temperature to obtain a mixed block;

[0067] S4. Low-temperature milling and pulverizing: The mixed mass is added to a mill and subjected to a low-temperature milling operation until the passing rate of the pulverized material through an 8-mesh sieve reaches 70%, and finally the hexazinone-gelatin powder is obtained in the mill.

[0068] In S3, a release agent is pre-coated on the inner wall of the mold, and the room temperature is 20°C.

[0069] In S4, the material temperature of the low-temperature pulverization operation is 16°C.

[0070] Finally, the method for using the forest herbicide comprises the following steps in sequence:

[0071] T1. Preparing a herbicide liquid: Adding the forest herbicide and water to a heated and stirred pesticide spraying vehicle to prepare a suspension of the herbicide liquid;

[0072] T2. Spraying herbaceous and climbing weeds: Turn on the heating and stirring functions of the pesticide sprayer to begin melting the gelatin portion of the hexazinone-gelatin powder for spraying herbaceous and climbing weeds with terbuthylazine as the main component and hexazinone as the auxiliary component;

[0073] T3. Spraying non-target trees: increasing the heating temperature of the pesticide spraying vehicle to melt all the gelatin in the hexazinone-gelatin powder, and spraying the non-target trees with hexazinone as the main component and terbuthylazine as the auxiliary component;

[0074] T4. Turn off the pesticide spraying vehicle: spray the remaining herbicide liquid on all non-target trees, turn off the heating and stirring actions of the pesticide spraying vehicle, and the entire use method is completed.

[0075] Among them, the above-mentioned heating and stirring pesticide sprayer is a 9.35-ton Dongfeng Huashen T1 sprinkler sold by Hubei Yingtong Special Purpose Vehicle Co., Ltd. The vehicle has a spraying structure with adjustable pitch angle, and an additional customized stirring structure and heating structure in the water tank.

[0076] In addition, the above-mentioned heating and stirring pesticide spraying vehicle can also use a pesticide spraying device disclosed in the utility model patent with patent announcement number CN207754416U.

[0077] In T1, the weight ratio of the forest herbicide to water was 1:300.

[0078] In T2, the temperature of the herbicide liquid was 36°C, and the viscosity at 25°C was 18 cps.

[0079] In T3, the temperature of the herbicide solution was 41°C, and the viscosity at 25°C was 32 cps.

[0080] Example 2

[0081] A forest herbicide containing terbuthylazine and hexazinone, the raw materials of which include:

[0082] 100 parts of terbuthylazine powder,

[0083] 30 parts of hexazinone-gelatin powder,

[0084] 2 parts of sodium fatty alcohol sulfonate dispersant,

[0085] 1 part of dibutylnaphthalene sulfonate wetting agent,

[0086] 2 parts of Tween 80 emulsifier.

[0087] The particle size of the terbuthylazine powder is 0.9-1.1 mm, and the particle size of the hexazinone-gelatin powder is 2.2-2.5 mm.

[0088] The molecular weight of gelatin in the hexazinone-gelatin powder is 72,000-79,000, and the weight of gelatin is 16% of the weight of hexazinone.

[0089] In addition, the preparation method of the hexazinone-gelatin powder comprises the following steps in sequence:

[0090] S1. Gelatin melting: Add gelatin blocks into a stirred tank, heat the gelatin blocks to 35° C., and maintain for 8 minutes to obtain gelatin solution;

[0091] S2. Hexazinone mixing: keeping the temperature of the gelatin solution constant, adding hexazinone to the gelatin solution while stirring, and stirring and mixing for 10 minutes to obtain a mixture;

[0092] S3, cooling and solidifying: discharging the mixture into a mold, and then cooling and solidifying at room temperature to obtain a mixed block;

[0093] S4. Low-temperature milling and pulverizing: The mixed mass is added to a mill and subjected to a low-temperature milling operation until the passing rate of the pulverized material through an 8-mesh sieve reaches 70%, and finally the hexazinone-gelatin powder is obtained in the mill.

[0094] In S3, a release agent is pre-coated on the inner wall of the mold. At this time, the room temperature is 26°C. The mold is cooled in a water bath and the temperature of the mold is 17°C.

[0095] In S4, the material temperature of the low-temperature pulverization operation is 17°C.

[0096] Finally, the method for using the forest herbicide comprises the following steps in sequence:

[0097] T1. Preparing a herbicide liquid: Adding the forest herbicide and water to a heated and stirred pesticide spraying vehicle to prepare a suspension of the herbicide liquid;

[0098] T2. Spraying herbaceous and climbing weeds: Turn on the heating and stirring functions of the pesticide sprayer to begin melting the gelatin portion of the hexazinone-gelatin powder for spraying herbaceous and climbing weeds with terbuthylazine as the main component and hexazinone as the auxiliary component;

[0099] T3. Spraying non-target trees: increasing the heating temperature of the pesticide spraying vehicle to melt all the gelatin in the hexazinone-gelatin powder, and spraying the non-target trees with hexazinone as the main component and terbuthylazine as the auxiliary component;

[0100] T4. Turn off the pesticide spraying vehicle: spray the remaining herbicide liquid on all non-target trees, turn off the heating and stirring actions of the pesticide spraying vehicle, and the entire use method is completed.

[0101] Among them, the above-mentioned heating and stirring pesticide sprayer is a 9.35-ton Dongfeng Huashen T1 sprinkler sold by Hubei Yingtong Special Purpose Vehicle Co., Ltd. The vehicle has a spraying structure with adjustable pitch angle, and an additional customized stirring structure and heating structure in the water tank.

[0102] In addition, the above-mentioned heating and stirring pesticide spraying vehicle can also use a pesticide spraying device disclosed in the utility model patent with patent announcement number CN207754416U.

[0103] In T1, the weight ratio of the forest herbicide to water was 1:260.

[0104] In T2, the temperature of the herbicide liquid was 36°C, and the viscosity at 25°C was 19 cps.

[0105] In T3, the temperature of the herbicide solution was 42°C, and the viscosity at 25°C was 33 cps.

[0106] Example 3

[0107] A forest herbicide containing terbuthylazine and hexazinone, the raw materials of which include:

[0108] 102 parts of terbuthylazine powder,

[0109] 30 parts of hexazinone-gelatin powder,

[0110] 2 parts of sodium fatty alcohol sulfonate dispersant,

[0111] 1 part of dibutylnaphthalene sulfonate wetting agent,

[0112] 2 parts of Tween 80 emulsifier.

[0113] The particle size of the terbuthylazine powder is 0.9-1.2 mm, and the particle size of the hexazinone-gelatin powder is 2.0-2.4 mm.

[0114] The molecular weight of gelatin in the hexazinone-gelatin powder is 62,000-76,000, and the weight of gelatin is 18% of the weight of hexazinone.

[0115] In addition, the preparation method of the hexazinone-gelatin powder comprises the following steps in sequence:

[0116] S1. Gelatin melting: Add gelatin blocks to a stirred tank, heat the gelatin blocks to 36° C., and maintain for 8 minutes to obtain gelatin solution;

[0117] S2. Hexazinone mixing: keeping the temperature of the gelatin solution constant, adding hexazinone to the gelatin solution while stirring, and stirring and mixing for 9 minutes to obtain a mixture;

[0118] S3, cooling and solidifying: discharging the mixture into a mold, and then cooling and solidifying at room temperature to obtain a mixed block;

[0119] S4. Low-temperature milling and pulverizing: The mixed mass is added to a mill and subjected to a low-temperature milling operation until the passing rate of the pulverized material through an 8-mesh sieve reaches 70%, and finally the hexazinone-gelatin powder is obtained in the mill.

[0120] In S3, a release agent is pre-coated on the inner wall of the mold. At this time, the room temperature is 28°C. The mold is cooled in a water bath and the temperature of the mold is 16°C.

[0121] In S4, the material temperature of the low-temperature crushing operation is 18°C.

[0122] Finally, the method for using the forest herbicide comprises the following steps in sequence:

[0123] T1. Preparing a herbicide liquid: Adding the forest herbicide and water to a heated and stirred pesticide spraying vehicle to prepare a suspension of the herbicide liquid;

[0124] T2. Spraying herbaceous and climbing weeds: Turn on the heating and stirring functions of the pesticide sprayer to begin melting the gelatin portion of the hexazinone-gelatin powder for spraying herbaceous and climbing weeds with terbuthylazine as the main component and hexazinone as the auxiliary component;

[0125] T3. Spraying non-target trees: increasing the heating temperature of the pesticide spraying vehicle to melt all the gelatin in the hexazinone-gelatin powder, and spraying the non-target trees with hexazinone as the main component and terbuthylazine as the auxiliary component;

[0126] T4. Turn off the pesticide spraying vehicle: spray the remaining herbicide liquid on all non-target trees, turn off the heating and stirring actions of the pesticide spraying vehicle, and the entire use method is completed.

[0127] Among them, the above-mentioned heating and stirring pesticide sprayer is a 9.35-ton Dongfeng Huashen T1 sprinkler sold by Hubei Yingtong Special Purpose Vehicle Co., Ltd. The vehicle has a spraying structure with adjustable pitch angle, and an additional customized stirring structure and heating structure in the water tank.

[0128] In addition, the above-mentioned heating and stirring pesticide spraying vehicle can also use a pesticide spraying device disclosed in the utility model patent with patent announcement number CN207754416U.

[0129] In T1, the weight ratio of the forest herbicide to water was 1:280.

[0130] In T2, the temperature of the herbicide liquid was 37°C, and the viscosity at 25°C was 20 cps.

[0131] In T3, the temperature of the herbicide solution was 45°C, and the viscosity at 25°C was 34 cps.

[0132] Comparative Example 1

[0133] The forest herbicide in this comparative example, and its preparation method and use method, are different from those in Example 1 only in the following aspects:

[0134] Instead of the hexazinone-gelatin powder, hexazinone alone, which has not been bound to gelatin, is used, and none of the restrictions on the hexazinone-gelatin powder exist.

[0135] Comparative Example 2

[0136] The forest herbicide in this comparative example, and its preparation method and use method, are different from those in Example 1 only in the following aspects:

[0137] Spray non-target trees first, then spray herbaceous and climbing weeds after temperatures have cooled.

[0138] Comparative Example 3

[0139] The forest herbicide in this comparative example, and its preparation method and use method, are different from those in Example 1 only in the following aspects:

[0140] After the gelatin is fully melted, spray the target trees, as well as herbaceous and climbing weeds.

[0141] Comparative Example 4

[0142] The forest herbicide in this comparative example, and its preparation method and use method, are different from those in Example 1 only in the following aspects:

[0143] Prepare a special herbicide for herbaceous and vine weeds with a weight ratio of 6:1 between ordinary terbuthylazine and hexazinone, and a special herbicide for non-target trees with a weight ratio of 1:10 between ordinary terbuthylazine and hexazinone, and carry out sufficient and appropriate spraying operations respectively.

[0144] controlled trials

[0145] Seven experimental plots were selected from a whole eucalyptus plantation, each about 20m 2 Each plot has two types of non-target trees, poplar and locust, as well as a moderate amount of weeds including at least: dodder, corydalis, bermudagrass, and foxtail grass. The pesticide sprayer does not need to spray while driving, but only needs to stop at the edge of the test site and adjust the spraying angle up and down.

[0146] Each plantation was sprayed with the forest herbicides in the three examples and four comparative examples, and the weed control effects were observed after three days. The specific results are shown in the following table.

[0147] Table 2. Results of control test

[0148]

[0149] Result Analysis

[0150] The forest herbicides in the first and third embodiments can simultaneously achieve: targeted control of non-target trees and weeds, and can be sprayed with water in one go, which is crucial for herbicide spraying operations far away from water sources and operated by only one vehicle.

[0151] Second, although water was added at one time in Comparative Examples 1, 2, and 3, it was difficult to achieve targeted and efficient weed control effects of "hexazinone as the main agent and terbuthylazine as the auxiliary agent" for non-target trees and "terbuthylazine as the main agent and hexazinone as the auxiliary agent" for weeds. In all three, terbuthylazine and hexazinone were sprayed together, and this spraying ratio was not in the optimal range for non-target trees and weeds.

[0152] Third, the suitable herbicide ratio for non-target trees in the eucalyptus plantation is a weight ratio of terbuthylazine to hexazinone of about 1:10. The suitable herbicide ratio for weeds in the eucalyptus plantation is a weight ratio of terbuthylazine to hexazinone of about 6:1. The forest herbicides in the three embodiments are actually sprayed in approximately this ratio.

[0153] While the embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments. Various modifications are possible within the scope of knowledge possessed by persons skilled in the art without departing from the spirit of the present invention. These modifications are non-inventive and are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A method for using a forest herbicide comprising terbuthylazine and hexazinone, characterized in that: The following steps are included in sequence: T1. Preparing a herbicide liquid: Adding the forest herbicide and water to a heated and stirred pesticide spraying vehicle to prepare a suspension of the herbicide liquid; T2. Spraying herbaceous and climbing weeds: Turn on the heating and stirring functions of the pesticide sprayer to begin melting the gelatin portion of the hexazinone-gelatin powder for spraying herbaceous and climbing weeds with terbuthylazine as the main component and hexazinone as the auxiliary component; T3. Spraying non-target trees: increasing the heating temperature of the pesticide spraying vehicle to melt all the gelatin in the hexazinone-gelatin powder, and spraying the non-target trees with hexazinone as the main component and terbuthylazine as the auxiliary component; T4. Turn off the pesticide spraying vehicle: spray the remaining herbicide liquid on all non-target trees, turn off the heating and stirring actions of the pesticide spraying vehicle, and the entire method of use is completed. The raw materials of the forest herbicide include terbuthylazine powder for forming a herbicide liquid suspension, and hexazinone-gelatin powder for forming a herbicide liquid precipitate and used after the herbicide liquid is heated. The particle size of the terbuthylazine powder is 0.8-1.2 mm, and the particle size of the hexazinone-gelatin powder is 2.0-2.5 mm.

2. The method for using a forest herbicide comprising terbuthylazine and hexazinone according to claim 1, wherein: In the hexazinone-gelatin powder, the molecular weight of gelatin is 55,000-80,000, and the weight of gelatin is 12-18% of the weight of hexazinone.

3. The method for using the forest herbicide comprising terbuthylazine and hexazinone according to claim 1, wherein: The weight of the terbuthylazine powder is 2.5-3.5 times the weight of the hexazinone-gelatin powder.

4. The method for using the forest herbicide comprising terbuthylazine and hexazinone according to claim 1, characterized in that The preparation method of the hexazinone-gelatin powder comprises the following steps in sequence: S1. Gelatin melting: Add gelatin blocks to a stirred tank, heat the gelatin blocks to 34-36°C, and maintain for 5-8 minutes to obtain gelatin solution; S2. Hexazinone mixing: keeping the temperature of the gelatin solution constant, adding hexazinone to the gelatin solution while stirring, and stirring and mixing for 5-10 minutes to obtain a mixture; S3, cooling and solidifying: discharging the mixture into a mold, and then cooling and solidifying at room temperature to obtain a mixed block; S4. Low-temperature milling and pulverizing: The mixed mass is added to a mill and subjected to a low-temperature milling operation until the passing rate of the pulverized material through an 8-mesh sieve reaches 70%, and finally the hexazinone-gelatin powder is obtained in the mill.

5. The method for using the forest herbicide comprising terbuthylazine and hexazinone according to claim 4, characterized in that: In S3, a release agent is pre-coated on the inner wall of the mold, and when the room temperature is higher than 25°C, the mold is cooled to a temperature of 10-18°C.

6. The method for using the forest herbicide comprising terbuthylazine and hexazinone according to claim 4, wherein: In S4, the material temperature of the low-temperature crushing operation is 15-20°C.

7. The method for using a forest herbicide comprising terbuthylazine and hexazinone according to claim 1, wherein: In T1, the weight ratio of the forest herbicide to water is 1:(200-300).

8. The method for using the forest herbicide comprising terbuthylazine and hexazinone according to claim 1, wherein: In T2, the temperature of the herbicide solution is 36-38°C, and the viscosity at 25°C is 18-22 cps.

9. The method for using a forest herbicide comprising terbuthylazine and hexazinone according to claim 1, wherein: In T3, the temperature of the herbicide solution is 40-45°C, and the viscosity at 25°C is 30-35 cps.

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