A device for measuring soil ammonia volatilization flux of sub-irrigation cotton field

Abstract

The utility model discloses a device for determining under-membrane drip irrigation cotton field soil ammonia volatilization flux, including the barrel, the barrel is through and its lower end can be inserted into the soil, the mulching film, the mulching film is supported in the barrel inner chamber and can cover the surface of soil, the liquid immersion sponge, the liquid immersion sponge is detachably connected in the barrel and is located above the mulching film, two surfaces opposite of the liquid immersion sponge and the mulching film are enclosed with the inner wall of the barrel and form the air chamber. The utility model can simulate the most real field situation of the mulching cotton field, and then avoid that the cotton field soil ammonia volatilization flux is overestimated, is applicable to under-membrane drip irrigation cotton field planting system, and simple operation, the cost is lower.

Description

Technical Field

[0001] This utility model relates to the field of soil monitoring technology, and more specifically to a device for measuring the ammonia volatilization flux in soil of cotton fields irrigated under mulch. Background Technology

[0002] Mulching is typically an important management practice in cotton cultivation. Because mulch is permeable, it prevents ammonia gas evaporating from the soil surface from being completely released into the air; some of the ammonia is reabsorbed by the soil and converted into nitrogen that plants can use.

[0003] Current technology for measuring ammonia volatilization in cotton field soil does not take into account the plastic film in the measuring device, which will overestimate the ammonia volatilization flux in cotton field soil.

[0004] Therefore, how to provide a device for measuring ammonia volatilization flux that can be applied to cotton planting systems under drip irrigation with plastic film is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a device for measuring the soil ammonia volatilization flux in cotton fields irrigated under mulch film, which is suitable for cotton planting systems irrigated under mulch film, and is simple to operate and has a low cost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An apparatus for measuring soil ammonia volatilization flux in cotton fields irrigated under mulch film includes:

[0008] A cylindrical body, which is open from top to bottom and whose lower end can be inserted into the soil;

[0009] The mulch film is supported within the inner cavity of the cylinder and can cover the surface of the soil;

[0010] An impregnated sponge is detachably connected to the cylinder and located above the mulch film. The two opposing surfaces of the impregnated sponge and the mulch film, together with the inner wall of the cylinder, form an air chamber.

[0011] The beneficial effects of this utility model are that the soaked sponge is filled with a solution for absorbing ammonia. By setting up a mulch film inside the cylinder and covering the soil surface with the mulch film, the actual soil mulching planting conditions can be simulated. Under the action of the mulch film, some of the ammonia in the soil will be reabsorbed by the soil, and some will enter the gas chamber. The ammonia entering the gas chamber will be absorbed by the soaked sponge. By analyzing the ammonia content in the soaked sponge through experiments and calculations, the ammonia volatilization flux in the drip irrigation cotton field planting system under the mulch film can be accurately measured.

[0012] Preferably, a support ring is included. The plastic film is square or circular. The support ring presses the square or circular plastic film tightly and supports it inside the cylinder. During the installation of the plastic film inside the cylinder, the plastic film is placed on the upper end face of the cylinder. The support ring presses down on the plastic film and pushes the support ring downwards along the inner cavity of the cylinder. The support ring can support the plastic film inside the cylinder, simulating an actual cotton field mulching planting system.

[0013] Preferably, the support ring is a plastic ring with an outer diameter larger than the inner diameter of the cylinder. The plastic ring has a certain degree of flexibility, and the fact that the outer diameter of the plastic ring is slightly larger than the inner diameter of the cylinder ensures that the mulch film can be effectively supported and compressed inside the cylinder.

[0014] Preferably, the bottom end of the cylinder has a square groove for accommodating the drip irrigation tape; the mulch film covers the drip irrigation tape. Using the square groove to accommodate the drip irrigation tape ensures the realism of the simulated mulched cotton field system.

[0015] Preferably, two soaked sponges are provided, arranged vertically at an interval, with the lower soaked sponge forming the air chamber between it and the mulch film. This double-layer sponge configuration ensures the accuracy of the measurement results.

[0016] Preferably, the device also includes a rain shield, which is fastened to the upper end of the cylinder. By providing a rain shield, the device can be protected from rain, wind, and sun.

[0017] Preferably, the bottom surface of the rain shield is fixed with multiple legs, and the ends of the legs away from the rain shield are inserted into or snapped into the upper outer wall of the cylinder; there is a gap between the bottom surface of the rain shield and the upper surface of the cylinder. The gap between the rain shield and the cylinder ensures air circulation.

[0018] Preferably, the rain shield is a circular plate with an outer diameter larger than that of the cylinder.

[0019] Preferably, the cylindrical body is a PVC ring with a height of not less than 16cm.

[0020] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a device for measuring the soil ammonia volatilization flux in cotton fields under drip irrigation, which can simulate the most realistic field conditions of cotton fields under mulch, thereby avoiding the overestimation of the soil ammonia volatilization flux in cotton fields. It is suitable for cotton field planting systems under drip irrigation, and is simple to operate and has a low cost. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 A schematic diagram of the device structure provided by this utility model;

[0023] Figure 2 A cross-sectional view of the device provided by this utility model during use.

[0024] Among them, 1-cylinder; 2-soaked sponge; 3-mulch film; 4-support ring; 5-rain shield; 6-support leg; 7-drip irrigation tape; 8-square trough; 9-soil. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] like Figure 1 and 2 As shown, an apparatus for measuring the ammonia volatilization flux in soil of a cotton field under drip irrigation according to an embodiment of the present invention is applicable to a cotton field planting system under drip irrigation. It includes a cylinder 1, a plastic film 3, and an impregnated sponge 2. The cylinder 1 is vertically connected and its lower end can be inserted into the soil 9. The cylinder 1 is a PVC ring with a height of not less than 16cm. The plastic film 3 is supported in the inner cavity of the cylinder 1 and can cover the surface of the soil 9. The impregnated sponge 2 is detachably connected to the cylinder 1 and is located above the plastic film 3. The two opposing surfaces of the impregnated sponge 2 and the plastic film 3 together with the inner wall of the cylinder 1 form an air chamber.

[0027] The sponge is soaked in a solution that can absorb ammonia gas. The sponge is soaked until it is saturated with the solution without dripping. The system simulates the actual mulched cotton field planting system by supporting the mulch film inside the cylinder, thus avoiding the overestimation of the ammonia volatilization flux in the cotton field soil.

[0028] To further optimize the above technical solution, a support ring 4 is included. The ground film 3 is square or circular. The support ring 4 presses the square or circular ground film 3 tightly and supports it within the inner cavity of the cylinder 1. While the support ring 4 presses the ground film 3 downward, the ground film 3 adapts to the shape of the support ring 4, and the edge of the ground film 3 extends upward. When the ground film 3 is in position, a seal is formed between the ground film 3 and the inner wall of the cylinder 1 under the support of the support ring 4, preventing ammonia gas from leaking from the contact point between the support ring and the cylinder.

[0029] To further optimize the above technical solution, the support ring 4 is a plastic ring with an outer diameter larger than the inner diameter of the cylinder 1. The plastic ring has a certain degree of flexibility, and the fact that its outer diameter is larger than the inner diameter of the cylinder allows the support ring to firmly hold the mulch film inside the cylinder, preventing the mulch film from shifting during the measurement process.

[0030] In other specific embodiments, for a 1-film 3-pipe drip irrigation cotton field planting system, a square groove 8 for accommodating the drip irrigation tape 7 is provided at the bottom of the cylinder 1; the mulch film 3 covers the drip irrigation tape 7. There are two square grooves 8 arranged symmetrically, which facilitates the drip irrigation tape 7 to pass through the lower end of the cylinder 1.

[0031] To further optimize the above technical solution, two liquid-impregnated sponges 2 are provided, which are arranged vertically and horizontally, with the lower liquid-impregnated sponge 2 forming an air chamber between it and the ground film 3.

[0032] To further optimize the above technical solution and improve the rainproof performance of the device, a rain shield 5 is also included, which is fastened to the upper end of the cylinder 1.

[0033] In some other embodiments, a plurality of support legs 6 are fixed to the bottom surface of the rain shield 5, and the end of the support leg 6 away from the rain shield 5 is inserted or snapped into the upper outer wall of the cylinder 1; there is a gap between the bottom surface of the rain shield 5 and the upper surface of the cylinder 1. The rain shield 5 is a circular plate, and its outer diameter is larger than the outer diameter of the cylinder 1.

[0034] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0035] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for measuring the soil ammonia volatilization flux in cotton fields irrigated under drip film, characterized in that, include: The cylinder (1) is open from top to bottom and its lower end can be inserted into the soil (9); The mulch film (3) is supported in the inner cavity of the cylinder (1) and can cover the surface of the soil (9); The liquid-impregnated sponge (2) is detachably connected to the cylinder (1) and located above the mulch film (3). The two opposing surfaces of the liquid-impregnated sponge (2) and the mulch film (3) together with the inner wall of the cylinder (1) form an air chamber.

2. The device for measuring soil ammonia volatilization flux in drip-irrigated cotton fields according to claim 1, characterized in that, Includes a support ring (4), the mulch film (3) is square or round, the support ring (4) presses the square or round mulch film (3) tightly and supports it in the inner cavity of the cylinder (1).

3. The device for measuring soil ammonia volatilization flux in drip-irrigated cotton fields according to claim 2, characterized in that, The support ring (4) is a plastic ring, and its outer diameter is larger than the inner diameter of the cylinder (1).

4. The device for measuring soil ammonia volatilization flux in drip-irrigated cotton fields according to claim 2, characterized in that, The bottom end of the cylinder (1) is provided with a square groove (8) for accommodating the drip irrigation tape (7); the mulch film (3) covers the drip irrigation tape (7).

5. The device for measuring soil ammonia volatilization flux in drip-irrigated cotton fields according to claim 1, characterized in that, The liquid-impregnated sponge (2) consists of two pieces, which are arranged vertically at intervals. The air chamber is formed between the lower liquid-impregnated sponge (2) and the ground film (3).

6. The device for measuring soil ammonia volatilization flux in drip-irrigated cotton fields according to claim 1, characterized in that, It also includes a rain shield (5), which fastens to the upper end of the cylinder (1).

7. The device for determining the soil ammonia volatilization flux in drip-irrigated cotton fields according to claim 6, characterized in that, The bottom surface of the rain shield (5) is fixed with multiple support legs (6), and the end of the support leg (6) away from the rain shield (5) is inserted or snapped into the upper outer wall of the cylinder (1) for fastening; there is a gap between the bottom surface of the rain shield (5) and the upper surface of the cylinder (1).

8. The device for determining the soil ammonia volatilization flux in drip-irrigated cotton fields according to claim 7, characterized in that, The rain shield (5) is a circular plate with an outer diameter larger than that of the cylinder (1).

9. The device for determining the soil ammonia volatilization flux in drip-irrigated cotton fields according to claim 1, characterized in that, The cylinder (1) is a PVC ring with a height of not less than 16cm.

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