CN115399130A - Anti-lodging rice fertilization device and anti-lodging rice fertilization method - Google Patents

Abstract

The invention discloses a rice lodging-proof fertilization device and a lodging-proof fertilization method, and relates to the technical field of rice fertilization, including a water tank, the water tank is provided with a liquid pump, and the liquid pump is connected with a bottom shunt pipe through a first connecting pipe. The bottom branch pipe is connected with a flexible pipe, and the end of the flexible pipe away from the bottom branch pipe is connected with a stagnant blade back nozzle. The invention adopts the anti-lodging fertilization design on the back of rice leaves and rhizomes, and installs a stagnant leaf back sprinkler at the bottom of the hose. On the one hand, the airflow generated by the stagnant leaf back sprinkler can hold it in the air to carry out targeted fertilization on the back of rice leaves and rhizomes Spraying, on the other hand, the airflow generated by the nozzle on the back of the leaf can make the liquid near the rice root be blown away by the wind and leak out of the soil. This method of fertilization can increase the air permeability of the soil and increase the oxygen content in the soil. The role of rooting is to increase the vitality of the root system, which can play a role in strengthening the roots and resisting lodging.

Description

Anti-lodging fertilization device and anti-lodging fertilization method for rice

technical field

The invention relates to the technical field of rice fertilization, in particular to a rice lodging-proof fertilization device and a lodging-proof fertilization method.

Background technique

With the continuous improvement of rice production level and frequent occurrence of extreme climates, rice lodging has increasingly become a constraint factor for high and stable yields. Lodging not only reduces yield, but also reduces rice quality. The lodging phenomenon in the late stage of rice growth will affect the normal filling and firming of rice, and even germination on the ear, which will affect the formation of rice yield, rice quality and mechanical harvesting. It is related to the impact and also related to fertilizer and water management. The main reasons for lodging in production are due to the lack of lodging resistance of varieties, unreasonable planting density, inadequate management of fertilizer and water, and damage from diseases and insect pests. If any of these aspects is not properly managed, it will cause lodging of rice. The lodging of rice is also caused by a combination of factors. It has a very serious impact on the yield of rice. The first type of performance is root lodging. Due to poor development of the root system, the roots are shallow and unstable, lack of support, and are slightly affected by wind and rain. If there is erosion, there will be flat ground lodging; the other is stem fall, because the stem is not strong and cannot bear the weight of the upper part, so different degrees of lodging will occur.

However, after the rice seeds are planted in the field, lodging can only be prevented through fertilizer and water management. The method of preventing lodging after planting is usually to spray foliar fertilizer when the rice is fertilized. First, the fertilizer effect is fast, and the rice leaves absorb and transform nutrients quickly. , foliar fertilization can quickly transform seedling conditions, which is beneficial to rice growth; second, to prolong the life of roots and leaves, foliar spraying of nitrogen, phosphorus, and fertilizers can strengthen rice leaf photosynthesis and root activity, and spray fertilizers in the late growth period of rice It can reduce the aging speed of leaves and roots, and promote the accumulation, transportation and transformation of nutrients, thereby achieving the purpose of preventing lodging. However, in the prior art, farmers often only spray fertilizer solutions on the front of leaves and ignore the back of leaves and rhizomes. The effect is often unsatisfactory, because the foliar fertilizer is mainly absorbed by the leaves through the diffusion of stomata, and the distribution of stomata on the leaves is generally more on the back of the leaf than the front of the leaf. Therefore, when spraying foliar fertilizer, pay attention to both the front and back of the leaves. Spray to expand the absorption surface, thus need to change the rice fertilization device in the prior art to achieve better lodging resistance.

Contents of the invention

The purpose of the present invention is in order to solve above-mentioned problem, and proposes a kind of rice anti-lodging fertilization device and anti-lodging fertilization method.

In order to achieve the above object, the present invention adopts the following technical solutions:

An anti-lodging fertilization device for rice, comprising a water tank, the water tank is provided with a liquid pump, the liquid pump is connected with a bottom branch pipe through a first connecting pipe, and the bottom branch pipe is connected with a hose, and the hose is away from One end of the bottom shunt pipe is connected with a stagnant blade back nozzle;

The air outlet nozzle has an air outlet and a liquid outlet, the liquid outlet is located on the upper side of the liquid outlet, and the air outlet sprays air to the ground so that the air outlet nozzle stays in the air, and the liquid outlet is outward The spray liquid is sprayed on the back side of the paddy rice leaf.

Optionally, the liquid outlet of the liquid pump is also connected with a second connecting pipe, and the second connecting pipe is connected with a spraying pipe, and the bottom end of the spraying pipe is provided with a spraying head for downward spraying. .

Optionally, the liquid outlet of the stagnant blade back nozzle is composed of a connector, a nozzle and a spray hole, one end of the connector communicates with the hose, the other end of the connector communicates with the nozzle, and the nozzle of the nozzle communicates with the nozzle. The upper surface is provided with a plurality of upward-facing spray holes;

The air outlet of the stagnant blade back nozzle is composed of a DC power supply, a blower fan, a gas-gathering hood, an exhaust port and an air inlet, the DC power supply is arranged between the nozzle and the gas-gathering hood, and the bottom of the gas-gathering hood There is an exhaust port, and the upper end of the gas gathering hood is provided with a plurality of air intake holes connected internally and externally. The fan is arranged in the gas gathering hood and is electrically connected to the DC power supply. Exhaust air from the exhaust port.

Optionally, the hose is composed of an outer layer of the hose and an inner layer of the hose, and a rheological medium is filled between the outer layer of the hose and the inner layer of the hose, and the rheological medium is an electrorheological fluid , both the outer layer of the hose and the inner wall of the inner layer of the hose are provided with a conductive layer;

The conductive layer of the inner layer of the hose is connected to the positive pole of the DC power supply through a wire, and the conductive layer of the outer layer of the hose is grounded.

Optionally, the stagnant blade-back sprinkler head also includes a wind trigger joint, and the wind trigger joint is arranged on the upper side of the gas collecting hood and close to the air intake hole;

The wind trigger joint includes a first fixed block and a second fixed block fixed on the shell of the DC power supply, the first fixed block is fixedly connected to the shell of the DC power supply, and a chute is opened on the outer surface of the DC power supply, A slider is slidably connected in the chute, a spring is arranged between the slider and the first fixed block, a first contact is arranged on the slider, and a second contact is arranged on the second fixed block. The first contact is connected to the inner layer of the hose through a conductive layer through a wire, and the second contact is connected to the positive pole of the DC power supply.

The invention also discloses a rice lodging prevention fertilization method, which comprises the following steps:

S1. Choose to fertilize during the heading and fruiting stage of rice, choose potassium dihydrogen phosphate, use 2.3kg per 1hm2, add 400kg of water, and spray at the flowering stage. It can be sprayed all day long. During the flowering period of rice, do not spray between 8:00 and 14:00, so as not to affect flowering and pollination;

S2. When fertilizing, use a backpack or drone to fertilize according to the needs. When using a backpack to fertilize, the strap on the backpack is carried on the shoulder of the person, and the battery is loaded in the backpack. The back nozzle is located below the legs and knees of the person, and then the liquid pump is turned on, and the liquid pump sends a part of the liquid in the water tank into the hose through the first connecting pipe, and the fertilizer liquid sent into the hose passes through the stagnant leaf back nozzle Spray the back of the rice leaves, and the other part is sent into the spraying pipe through the second connecting pipe, and the fertilizer liquid sent into the spraying pipe is sprayed on the front of the leaves through the spraying head;

S3. When fertilizing through the stagnant blade back nozzle, turn on the fan, suck air from the air intake hole when the fan rotates, and exhaust air from the exhaust port so that air can be sprayed on the bottom surface of the rice planting, and stay in the air under the reaction force of the gas. Connect the conductive layer on the inner wall of the hose. At this time, the conductive layer on the inner wall of the hose is the positive electrode, and the conductive layer on the inner wall of the outer layer of the hose touches the ground through the ground wire to be the negative electrode, forming an electric field between the two. , in the energized state, the electrorheological fluid changes from a Newtonian fluid to a viscoplastic body, which can play a role in anti-disturbance of rice and prevent the hose from touching the rice and causing it to swing arbitrarily. angle instability;

S4. When using drones for fertilization, set the wind trigger connector to increase the battery life of the drone. When the drone fertilizes the dense rice, because there is more space around the air intake hole that is blocked by the rice, it enters the The gas in the intake hole is reduced, and a large local negative pressure is generated here. At this time, the slider will overcome the tension of the spring and stick to the second fixed block under the action of the external atmospheric pressure. At this time, the first contact It is electrically connected with the second contact; when the UAV fertilizes the sparse rice, the air flow here is smooth because the space around the air intake hole is covered by the rice, which is not enough to make the slider overcome the tension removal movement of the spring .

Compared with the prior art, the present invention has the following advantages:

The invention adopts the anti-lodging fertilization design on the back of rice leaves and rhizomes, and installs a stagnant leaf back sprinkler at the bottom of the hose. On the one hand, the airflow generated by the stagnant leaf back sprinkler can hold it in the air to carry out targeted fertilization on the back of rice leaves and rhizomes Spraying, on the other hand, the airflow generated by the spray head on the back of the leaf can make the liquid near the rice root be blown away by the wind and leak out of the soil. This method of fertilization can increase the air permeability of the soil and increase the oxygen content in the soil. The role of rooting is to increase the vitality of the root system, which can play a role in strengthening the roots and resisting lodging.

The invention adopts a stable spraying design. The hose is composed of two parts: the outer layer of the hose and the inner layer of the hose. The liquid is transformed from a Newtonian fluid to a viscoplastic body, which can play a role in anti-disturbance of rice, avoiding the hose from touching the rice and causing it to swing arbitrarily, making the angle of exhaust and fertilization of the stagnant leaf back nozzle unstable.

The present invention also has an energy-saving design. By setting a wind-triggered joint, it can be determined whether the hose is energized according to the local density of the rice, so that when the rice is obstructed, the hose can be hardened to increase its stability. Less power outages save energy and increase battery life.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

Fig. 2 is the structure schematic diagram of stagnant blade back nozzle among the present invention;

Fig. 3 is a structural schematic diagram of the wind trigger joint in the present invention;

Fig. 4 is a partial sectional view of the hose in the present invention;

Fig. 5 is a schematic diagram of spraying fertilization according to Embodiment 1 of the present invention;

6 is a schematic diagram of the overall structure of Embodiment 2 of the present invention;

Fig. 7 is a schematic diagram of spraying fertilization according to Embodiment 2 of the present invention.

In the figure: 1a backpack, 1b drone, 2 water tank, 3 liquid pump, 4 first connecting pipe, 5 spraying pipe, 6 spraying head, 7 bottom shunt pipe, 8 hose, 81 hose outer layer, 82 Hose inner layer, 83 rheological medium, 9 stagnant blade back nozzle, 91 connector, 92 nozzle, 93 nozzle hole, 94 DC power supply, 95 fan, 96 gas gathering hood, 97 exhaust port, 98 air intake hole, 99 Wind trigger joint, 991 first fixed block, 992 spring, 993 chute, 994 slide block, 995 first contact, 996 second contact, 997 second fixed block, 10 second connecting pipe.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

Embodiment one

Referring to Fig. 1, a kind of anti-lodging fertilization device and anti-lodging fertilization method for rice comprises a water tank 2, and a liquid pump 3 is arranged on the water tank 2, specifically, the liquid outlet end of the liquid pump 3 is also communicated with a second connection Pipe 10, the second connecting pipe 10 is connected with a spraying pipe 5, and the bottom end of the spraying pipe 5 is provided with a spraying head 6 for spraying downwards, and the rice is sprayed from top to bottom through the spraying head 6. forward spraying.

Referring to Fig. 1 and Fig. 4, the liquid pump 3 is connected with a bottom shunt pipe 7 through the first connecting pipe 4, and the bottom shunt pipe 7 is communicated with a hose 8, and in this embodiment, the hose 8 is made of a soft The tube outer layer 81 and the hose inner layer 82 are composed of two parts, and the rheological medium is filled between the hose outer layer 81 and the hose inner layer 82, and the rheological medium is an electrorheological fluid (Ce doped Electrorheological fluid composed of TiO2 particles and oil or damping oil), the inner walls of the hose outer layer 81 and the hose inner layer 82 are all provided with conductive layers. The conductive layer of the hose inner layer 82 is connected to the positive pole of the DC power supply through the wire 11, and the conductive layer of the hose outer layer 81 is grounded.

Referring to Fig. 2, the end of the hose 8 far away from the bottom branch pipe 7 is connected with a stagnant blade back nozzle 9, and the stagnant blade back nozzle 9 is equipped with an air outlet and a liquid outlet, and the liquid outlet is located at the liquid outlet On the upper side of the upper side, the air outlet part sprays air to the ground so that the stagnant leaf back spray nozzle 9 stays in the air, and the liquid outlet part sprays liquid outwards to spray the back side of the rice leaf.

Wherein, the liquid outlet part of the stagnant blade back nozzle is composed of a connector 91, a nozzle 92 and a spray hole 93, one end of the connector 91 communicates with the hose 8, and the other end of the connector 91 communicates with the nozzle 92 , the upper surface of the spray head 92 is provided with a plurality of upward-facing spray holes 93 .

Wherein, the air outlet part of the stagnant blade back spray head is composed of a DC power supply 94, a fan 95, a gas gathering cover 96, an exhaust port 97 and an air inlet 98, and the DC power supply 94 is arranged between the spray head 92 and the gas gathering cover 96 Between, the bottom end of described gas-gathering hood 96 is provided with exhaust port 97, and the upper end of described gas-gathering hood 96 is provided with a plurality of air intake holes 98 that communicate inside and outside, and described fan 95 is arranged in gas-gathering hood 96 and It is electrically connected with the DC power supply 94 , and when the fan 95 rotates, it sucks air from the air inlet 98 and exhausts it from the air outlet 97 .

With reference to Fig. 5, a kind of paddy rice anti-lodging fertilization method, this method comprises the steps:

Choose to fertilize during the heading and fruiting stage of rice, choose potassium dihydrogen phosphate, use 2.3kg per 1hm2, add 400kg of water, and spray at the flowering stage. The spraying time should be carried out at 15-16 o'clock in the evening on sunny days. Daily spraying, during the flowering period of rice, do not spray between 8:00 and 14:00, so as not to affect flowering and pollination. Because the main task during this period is to attack and strengthen the seeds, improve the maturity and fullness of the grains, and sufficient nutrient supply can greatly improve the quality of the grains. It is no longer suitable to apply fertilizers with high nitrogen content such as urea in this period, because During this period, the stems and leaves of the plants will basically no longer grow, and the foliar fertilizers should be sprayed reasonably after the ears are full on the fields with yellow leaves. On the one hand, it can play a role in strengthening the seeds. Live rods, anti-lodging and improving grain quality all have very obvious effects. Potassium dihydrogen phosphate and urea are the best foliar fertilizers, the dosage is 2.3kg of the former and 4.5kg of the latter per 1hm2, mixed with 400kg of water, and sprayed during the flowering period, or some biological potassium can be used together with plant growth regulators for spraying. The spraying time of foliar fertilizer should be chosen in the evening or 15-16 pm on a sunny day. On cloudy days, it can be sprayed all day. During the flowering period of rice, do not spray at 8-14 o'clock, so as not to affect flowering and pollination.

When fertilizing, choose backpack 1a or unmanned aerial vehicle 1b to fertilize according to needs. In this embodiment, backpack 1a is used for fertilization, and the strap on backpack 1a is carried on the shoulder of the person. Battery is loaded in backpack 1a. At this time, water tank 2 falls on the person's shoulder. Waist, while the hose 8 and the stagnant leaf back nozzle 9 are located under the legs and knees of the person, then the liquid pump 3 is turned on, and the liquid pump 3 sends a part of the liquid in the water tank 2 to the hose 8 through the first connecting pipe 4 Inside, the fertilizer liquid that is sent into the hose 8 is sprayed on the back of rice leaves through the stagnant leaf back nozzle 9, and the other part is sent into the spraying pipe 5 through the second connecting pipe 10, and the fertilizer liquid sent into the spraying pipe 5 The frontal spraying of the leaves is carried out through spray nozzles.

When fertilizing by stagnant blade back nozzle 9, connect fan 95, when fan 95 rotates, suck air from air inlet 98, exhaust from exhaust port 97 so that the bottom surface of rice planting can be sprayed, and the reaction force of gas Staying in the air, the height of staying in the air can be controlled by the size of the wind force, that is, the speed of the fan 95. The fan 95 can control the speed by adjusting the voltage, or use 4-wire fans or 2 and 3-wire fans for PWM speed regulation, through PWM pulses The circuit performs PWM control on +V and -V at both ends of the fan, which can achieve more flexible speed control on any DC fan.

On the one hand, the airflow produced by the air-staying leaf back nozzle 9 can hold it in the air so as to carry out targeted fertilization and spraying at the back of the rice leaf and the rhizome; Soil, this method of fertilization can increase the air permeability of the soil, increase the oxygen content in the soil, and then play the role of rooting. The increase of root system vitality can play the role of strong roots and lodging resistance.

Connect the conductive layer of the inner wall of the hose inner layer 82. At this time, the conductive layer of the inner wall of the hose inner layer 82 is a positive electrode, and the conductive layer of the inner wall of the hose outer layer 81 is a negative electrode through the ground wire. An electric field is formed between them. In the energized state, the electrorheological fluid changes from a Newtonian fluid to a viscoplastic body, which can play a role in resisting rice interference and prevent the hose 8 from touching the rice and causing it to swing arbitrarily. The angle of exhaust and fertilization is unstable.

Embodiment two

This embodiment is used based on the UAV 1b. The stagnant blade back nozzle 9 also includes a wind trigger joint 99, which is arranged on the upper side of the gas gathering hood 96 and close to the air inlet 98. The purpose of triggering connector 99 is to save energy, reduce energy consumption, and increase battery life (due to the limitation of the battery energy density of the drone and the control of the power of the drone, it is necessary to use energy-saving means to extend the battery life and reduce the battery life of the drone. The number of power changes during fertilization).

The wind trigger joint 99 includes a first fixed block 991 and a second fixed block 997 fixed on the casing of the DC power supply 94, the first fixed block 991 is fixedly connected to the casing of the DC power supply 94, and the DC power supply 94 The outer surface is provided with a chute 993, and a slide block 994 is slidably connected in the chute 993. A spring 992 is arranged between the slide block 994 and the first fixed block 991. The elastic force of the spring 992 and the initial tension can be Change according to actual needs, for example, when it is necessary to increase the sensitivity, a spring with smaller elastic force and initial tension can be used, and vice versa. The slider 994 is provided with a first contact 995, and the second fixed block 997 is provided with a second contact 996. The first contact is connected to the hose inner layer 82 through a conductive layer through a wire, so The second contact 996 is connected to the positive pole of the DC power supply 94 .

Referring to Fig. 7, when using the UAV 1b to fertilize, the UAV battery life is increased by setting the wind trigger joint 99. When the UAV 1b fertilizes the dense paddy rice, due to the surrounding area of the air intake hole 98 being blocked by the paddy rice There is more space, so the gas entering the air intake hole 98 is reduced, and a larger local negative pressure is generated here (according to aerodynamics, the faster the flow rate, the lower the pressure, and the greater the local negative pressure generated) , at this time, the slider 994 will overcome the tension of the spring 992 and stick to the second fixed block 997 under the action of the external atmospheric pressure. At this time, the first contact 995 and the second contact 996 are electrically connected; When fertilizing the paddy rice, because the space around the air intake hole 98 is less covered by the paddy rice, the air flow here is unobstructed, which is not enough to make the slider 994 overcome the tension removal movement of the spring 992, so as to power on in real time according to the density of paddy rice planting. Breakpoint, thus achieving the effect of energy saving. And because the flight of the UAV 1b is faster than that of a human, the hose 8 and the spray nozzle 9 in the air are actually in inertial motion when the UAV is flying. The occlusion of the rice will not hinder its inertial movement.

The above is only a preferred specific implementation of the present invention, and all implementations cannot be exhausted here, but the scope of protection of the present invention is not limited thereto. Within the technical scope, any equivalent replacement or change according to the technical solution of the present invention and its inventive concepts shall fall within the scope of protection of the present invention.

Claims (6)

1. A rice anti-lodging fertilization device, comprising a water tank (2), the water tank (2) is provided with a liquid pump (3), and the liquid pump (3) is connected with a bottom shunt by the first connecting pipe (4) Pipe (7), characterized in that the bottom branch pipe (7) is connected with a hose (8), and the end of the hose (8) away from the bottom branch pipe (7) is connected with a stagnant blade back nozzle (9) ; The air outlet nozzle (9) has an air outlet and a liquid outlet, the liquid outlet is located on the upper side of the liquid outlet, and the air outlet sprays air to the ground so that the air outlet nozzle (9) stays in the air, so The liquid outlet part sprays the liquid outwards to spray the back side of the paddy rice leaf. 2. a kind of paddy rice anti-lodging fertilization device according to claim 1, is characterized in that, the liquid outlet end of described liquid pump (3) is also communicated with second connecting pipe (10), and described second connecting pipe ( 10) A spraying pipe (5) is connected, and the bottom end of the spraying pipe (5) is provided with a spraying head (6) for spraying downwards. 3. a kind of paddy rice anti-lodging and fertilizing device according to claim 1, is characterized in that, the liquid outlet part of described stagnation leaf back nozzle is made of connector (91), nozzle (92) and spray hole (93), One end of the connecting head (91) communicates with the hose (8), and the other end of the connecting head (91) communicates with the spray head (92), and the upper surface of the spray head (92) is provided with a plurality of upward facing Nozzle (93); The air outlet of the stagnant blade back spray head is made of DC power supply (94), fan (95), gas gathering cover (96), exhaust port (97) and air intake hole (98), and the DC power supply (94) It is arranged between the spray head (92) and the gas-gathering hood (96), the bottom end of the gas-gathering hood (96) is provided with an exhaust port (97), and the upper end of the gas-gathering hood (96) is provided with a plurality of The air inlet (98) connected internally and externally, the fan (95) is arranged in the gas gathering cover (96) and is electrically connected with the DC power supply (94), and when the fan (95) rotates, the air inlet (98) Inhale and exhaust from the exhaust port (97). 4. A kind of rice lodging prevention fertilization device according to claim 3, is characterized in that, described hose (8) is made of two parts of hose outer layer (81) and hose inner layer (82), and described A rheological medium is filled between the outer layer of the hose (81) and the inner layer of the hose (82), and the rheological medium is an electrorheological fluid, and the outer layer of the hose (81) and the inner layer of the hose (82) The inner wall is provided with a conductive layer; The conductive layer of the inner layer of the hose (82) is connected to the positive pole of the DC power supply through a wire (11), and the conductive layer of the outer layer of the hose (81) is grounded. 5. A kind of anti-lodging and fertilizing device for rice according to claim 4, characterized in that, the stagnant blade back spray head (9) also includes a wind trigger joint (99), and the wind force trigger joint (99) is arranged at the gathering point The upper side of the gas cover (96) and close to the air inlet (98); The wind trigger joint (99) includes a first fixed block (991) and a second fixed block (997) fixed on the shell of the DC power supply (94), and the first fixed block (991) is fixedly connected to the DC power supply ( 94), the outer surface of the DC power supply (94) is provided with a chute (993), and a slider (994) is slidably connected in the chute (993), and the slider (994) is connected to the first A spring (992) is provided between a fixed block (991), a first contact (995) is provided on the slide block (994), and a second contact (997) is provided on the second fixed block (997) 996), the first contact is connected to the inner layer of the hose (82) through a conductive layer through a wire, and the second contact (996) is connected to the positive pole of the DC power supply (94). 6. A rice anti-lodging fertilization method is characterized in that the method may further comprise the steps: S1. Choose to fertilize during the heading and fruiting stage of rice, choose potassium dihydrogen phosphate, use 2.3kg per 1hm2, add 400kg of water, and spray at the flowering stage. Can be sprayed all day long; S2. When fertilizing, use backpack (1a) or drone (1b) to fertilize according to needs. When using backpack (1a) to fertilize, carry it on the shoulder of the person through the strap on the backpack (1a), and load the battery in the backpack (1a). At this time, the water tank (2) falls on the waist of the person, and the flexible pipe (8) and the spray nozzle on the back of the blade (9) are located at the lower part of the person's legs and knees, and then the liquid pump (3) is opened, and the liquid pump (3) A part of the liquid in the water tank (2) is sent into the hose (8) through the first connecting pipe (4), and the fertilizer liquid sent into the hose (8) is sprayed on the back of the rice leaf through the stagnant leaf back nozzle (9). Spraying, the other part is sent into the spraying pipe (5) through the second connecting pipe (10), and the fertilizer liquid sent into the spraying pipe (5) is sprayed on the front of the leaves by the spraying head; S3, when fertilizing by stagnant blade back sprinkler (9), connect fan (95), when fan (95) rotates, inhale air from air inlet (98), exhaust from exhaust port (97) so as to plant The bottom surface of the paddy rice sprays air, and stays in the air under the reaction force of gas, connects the conductive layer of hose inner layer (82) inner wall, and now the conductive layer of hose inner layer (82) inner wall is a positive electrode, and the hose outer layer (82) inner wall is a positive electrode. The conductive layer on the inner wall of the layer (81) touches the ground through the ground wire to form a negative electrode, and an electric field is formed between the two. In the energized state, the electrorheological fluid changes from a Newtonian fluid to a viscoplastic body, which can play a role in resisting rice interference. function, to prevent the flexible hose (8) from touching the rice and causing it to swing arbitrarily, so that the angle of exhaust and fertilization of the stagnant leaf back nozzle (9) is unstable; S4. When using the UAV (1b) to fertilize, increase the battery life of the UAV by setting the wind trigger joint (99). When the UAV (1b) fertilizes the dense rice, due to the air inlet (98 ) is surrounded by more space covered by rice, so the gas entering the air intake hole (98) is reduced, and a larger local negative pressure is generated here. At this time, the slider (994) will Overcome the pulling force of the spring (992) and stick to the second fixed block (997), and now the first contact (995) and the second contact (996) are electrically connected; During fertilization, because the space that is covered by paddy rice around the air intake hole (98) is more, thereby the air flow here is unimpeded, not enough to make slide block (994) overcome the tension removal motion of spring (992).

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