A device for conveniently analyzing soil nutrient distribution in a root box and a method of using the device

Abstract

The invention discloses a device for conveniently analyzing the distribution of soil nutrients in a root box and a method for using the device, comprising a root box body, a soil extractor punching plate, a soil guide punching plate and a container punching plate; the root box body is in a U-shaped structure; a back baffle and a front baffle are respectively arranged on the front and rear sides of the root box body; protrusions are fixedly connected to the outer sides of both sides of the front baffle and the back baffle; a plurality of clamping blocks are slidably connected between the mutually corresponding protrusions, and the clamping blocks are in a U-shaped structure; the soil in the root box body is collected by sleeve-setting with a first hollow column, so no matter it is inserted into the soil or pulled out of the soil, the soil will not fall off and be contaminated with each other. In the case of limiting the soil with the help of the back baffle and the insertion hole, the soil will not be mixed during the insertion and extraction process, so that the possibility of soil contamination between different areas is lower, and the measured data is more accurate.

Description

Technical Field

[0001] The invention belongs to the technical field of soil sampling in a root box, and particularly relates to a device for conveniently analyzing soil nutrient distribution in a root box and a use method thereof. Background Art

[0002] A root box is a commonly used device for studying the coupling between plant roots and soil nutrients and water. It usually consists of a transparent box or container and an observation window. The box is made of transparent material (such as plastic or glass) to facilitate observation of the growth and development of the roots. The root box can be used to study the growth and response of plant roots under different environmental conditions, such as the effects of soil moisture, nutrient concentration, temperature, and light on root growth.

[0003] Among them, when studying the distribution of soil nutrients in the root box, it is necessary to cut the soil blocks in the root box into several blocks according to a certain size in advance. After determining the soil nutrient content of each soil block, the nutrient distribution map is drawn using the contour map to achieve the purpose of understanding the distribution of soil nutrients in the root box.

[0004] However, this soil sampling method is not only time-consuming and labor-intensive, but also, due to the crude sampling tools, it is easy for soil in different areas to be contaminated with each other during the soil cutting process, resulting in differences between the measured values ​​and the actual situation, leading to errors in data analysis. Summary of the invention

[0005] The purpose of the present invention is to provide a device for conveniently analyzing the distribution of soil nutrients in a root box and a method for using the device to solve the problem in the prior art that when collecting and sampling soil in a root box, soil in different areas is easily contaminated with each other during the soil collection process, resulting in errors in the detection data.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A device for conveniently analyzing soil nutrient distribution in a root box and a method of using the device, comprising a root box body, a soil extractor perforated plate, a soil guide perforated plate and a container perforated plate;

[0008] The root box body presents a U-shaped structure; the front and rear sides of the root box body are respectively provided with a back baffle and a front baffle; the outer sides of the front baffle and the back baffle are fixedly connected with protrusions; the corresponding protrusions are slidably connected with a plurality of card blocks, which present a U-shaped structure; the two ends of the card blocks are fixedly connected with limit blocks;

[0009] The front baffle plate and the back baffle plate are provided with corresponding insertion holes; the sum of the thickness of the blocking plate and the limiting block is equal to the thickness of the protrusion;

[0010] A first hollow column is fixedly connected to the position of the soil extractor punching plate corresponding to the mesh hole; a solid column is fixedly connected to the soil guide punching plate; and a second hollow column is fixedly connected to the container punching plate.

[0011] Preferably, the upper and lower ends of the first hollow column are of a through-type structure; the solid column and the first hollow column fit together; the upper and lower ends of the second hollow column are of a through-type structure; and the end of the second hollow column away from the container punching plate is threadedly connected to a head.

[0012] Preferably, the inner diameter of the second hollow column is greater than the inner diameter of the first hollow column.

[0013] Preferably, the soil extractor perforated plate, the soil guide perforated plate and the container perforated plate are composed of a plate body with a flat mesh surface and uniform mesh holes, and the mesh holes correspond to the plug holes one by one.

[0014] Preferably, the length of the first hollow column is equal to or slightly greater than the thickness of the root box body.

[0015] Preferably, the spacing between the first hollow columns, the spacing between the second hollow columns and the spacing between the solid columns can be changed; and the positions of the insertion holes, the first hollow columns, the second hollow columns and the solid columns correspond one to one.

[0016] Preferably, the width of the earth guide perforated plate and the earth extractor perforated plate is equal to the distance between the protrusions on the same side.

[0017] Preferably, the sum of the thickness of the blocking plate and the limiting block is equal to the thickness of the protrusion.

[0018] Preferably, the soil collection step in the root box body includes the following steps:

[0019] A1: Slide the blocking plate on the reverse baffle of the root box body vertically in the opposite direction to expose the socket on the reverse baffle;

[0020] A2: Insert the soil sampler punching plate together with the first hollow column from the insertion hole into the soil inside the root box body by pressing, so that the soil inside the area to be studied enters the first hollow column;

[0021] A3: Take out the soil extractor punching plate together with the first hollow column from the root box body, and insert the first hollow column into the second hollow column;

[0022] A4: Insert the solid column on the perforated plate of the soil guide into the first hollow column, forcing the soil inside the first hollow column to enter the corresponding second hollow column to complete the in-situ collection of the soil;

[0023] A5: After determining the soil nutrient content, analyze the spatial distribution of soil nutrients in combination with contour maps.

[0024] Preferably, the soil collection step in the root box body includes the following steps:

[0025] B1: Remove the two blocking plates and the front baffle from the root box body, and then insert the container punching plate into the position that originally belonged to the front baffle;

[0026] B2: Insert the first hollow column on the punching plate of the soil extractor horizontally into the insertion hole from one side of the reverse baffle plate, and make it penetrate into the soil inside the root box body, with the end just inserted into the end of the second hollow column;

[0027] B3: Insert the solid column on the perforated plate of the soil guide into the first hollow column from the back of the perforated plate of the soil extractor, and use the solid column to push the soil inside the first hollow column into the corresponding second hollow column to complete the in-situ collection of the soil;

[0028] B4: After determining the soil nutrient content, analyze the spatial distribution of soil nutrients in combination with contour maps.

[0029] Beneficial effects of the present invention:

[0030] 1) The present invention collects the soil in the root box body by using a first hollow column. Therefore, no matter the root box is inserted into or pulled out of the soil, the soil will not fall off and be contaminated with each other. When the soil is limited by the back baffle and the plug hole, the soil will not be mixed during the insertion and extraction process, which reduces the possibility of soil contamination between different areas, thereby making the measured data more accurate.

[0031] 2) The present invention uses a soil extractor punching plate, a soil guide punching plate, a container punching plate and accessories thereof, and only needs to press the first hollow column into the root box body to completely take out all soil samples that need to be tested. The invention is convenient to use, has high measurement accuracy and takes little time.

[0032] 3) The present invention calculates the mass of the soil taken according to the soil bulk density and the soil volume of the first hollow column. Researchers can directly add an appropriate amount of leaching solution into the second hollow column for leaching, which is convenient and quick to operate.

[0033] 4) The present invention can change the research accuracy of soil nutrient distribution in the root box body by setting the distances between the first hollow columns, the second hollow columns and the solid columns to different distances. When the distances between the first hollow columns, the second hollow columns and the solid columns are larger, the research accuracy is lower; when the distances between the first hollow columns, the second hollow columns and the solid columns are smaller, the research accuracy is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a top view of the present invention;

[0037] Figure 3 It is a schematic diagram of the structure of the punching plate of the earth guide in the present invention;

[0038] Figure 4 It is a structural schematic diagram of the punching plate of the soil extractor in the present invention;

[0039] Figure 5 It is a schematic diagram of the structure of the container punching plate in the present invention;

[0040] Figure 6 It is a schematic diagram of the assembly structure of the container punching plate and the root box body in the present invention;

[0041] Figure 7 It is a cross-sectional view of the assembly structure of the container punching plate and the root box body in the present invention;

[0042] Figure 8 It is an exploded view of the assembly structure of the container punching plate and the root box body in the present invention;

[0043] Fig. 9 This is a distribution diagram of nitrate nitrogen content in a box of soil in the experiment of the present invention;

[0044] Fig.10 It is the distribution diagram of the content of available phosphorus in the soil of the second root box of the experiment of the present invention;

[0045] Fig.11 It is the distribution diagram of the content of ammonium nitrogen in the soil of three root boxes in the experiment of the present invention;

[0046] Fig.12 It is the distribution diagram of the content of ammonium nitrogen in the soil of four root boxes in the experiment of the present invention.

[0047] In the figure: 1, root box body; 2, back baffle; 3, front baffle; 4, jack; 5, protrusion; 6, block; 61, limit block; 7, blocking plate; 8, soil guide perforated plate; 801, solid column; 9, soil extractor perforated plate; 901, first hollow column; 10, container perforated plate; 1001, second hollow column; 1002, head. DETAILED DESCRIPTION

[0048] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] See also Figure 1-Figure 8 As shown, a device for conveniently analyzing the distribution of soil nutrients in a root box and a method of using the same, comprising a root box body 1, a soil extractor punching plate 9, a soil guide punching plate 8 and a container punching plate 10; the root box body 1 is in a U-shaped structure, and the specifications of the root box are 32 cm long, 32 cm high and 5 cm thick; a back baffle 2 and a front baffle 3 are respectively provided on the front and back sides of the root box body 1; protrusions 5 are fixedly connected to the outer sides of both sides of the front baffle 3 and the back baffle 2; a plurality of clamping blocks 6 (six in total are provided in this embodiment) are slidably connected between the corresponding protrusions 5, and the clamping blocks 6 are in a U-shaped structure; the two ends of the clamping blocks 6 are fixedly connected to limit blocks 61.

[0050] Please refer again Figure 1 , Figure 2 as well as Figure 8 As shown, the front baffle plate 3 and the back baffle plate 2 are provided with corresponding holes 4 (in this embodiment, 36 holes 4 are provided, and the spacing between the holes 4 is 5 cm); a blocking plate 7 is detachably provided between the front baffle plate 3 and the block 6 and between the back baffle plate 2 and the block 6, and is used to block the holes 4 on the front baffle plate 3 and the back baffle plate 2; the sum of the thickness of the blocking plate 7 and the limit block 61 is equal to the thickness of the protrusion 5.

[0051] By setting the sum of the thickness of the sealing plate 7 and the limit block 61 to be equal to the thickness of the protrusion 5, without affecting the fixation between the back baffle 2, the front baffle 3 and the root box body 1 through the cooperation of the clamping block 6 and the limit block 61, it is also possible to cooperate with the container punching plate 10 to fix it on the root box body 1 for easy fixation.

[0052] Please refer again Figure 3 , Figure 4 as well as Figure 5 As shown, the soil extractor perforated plate 9, the soil guide perforated plate 8 and the container perforated plate 10 are composed of a plate body with a flat mesh surface and uniform mesh holes, and the mesh holes correspond to the sockets 4 one by one; the width of the soil guide perforated plate 8 and the soil extractor perforated plate 9 is equal to the distance length between the protrusions 5 on the same side.

[0053] By setting the width of the soil guide perforated plate 8 and the soil extractor perforated plate 9 to the distance length between the protrusions 5, the limit block 61 can be prevented from affecting the insertion of the first hollow column 901 and the solid column 801. At the same time, the strength between the structures can be increased and the stability can be improved.

[0054] Please refer again Figure 3 , Figure 4 as well as Figure 5As shown, a first hollow column 901 corresponding to the position of the mesh hole is fixedly connected to the soil extractor punching plate 9, and the upper and lower ends of the first hollow column 901 are of a through-type structure; a solid column 801 corresponding to the first hollow column 901 is fixedly connected to the soil guide punching plate 8, and the solid column 801 and the first hollow column 901 fit each other; a second hollow column 1001 corresponding to the first hollow column 901 is fixedly connected to the container punching plate 10, and the upper and lower ends of the second hollow column 1001 are of a through-type structure, and the inner diameter of the second hollow column 1001 is larger than the inner diameter of the first hollow column 901; the end of the second hollow column 1001 away from the container punching plate 10 is threadedly connected to a head 1002.

[0055] After the spacing between the insertion holes 4 is changed, the distance between the first hollow columns 901, the distance between the second hollow columns 1001 or the distance between the solid columns 801 should be adaptively changed so that they can be inserted and matched with each other to complete soil sampling.

[0056] In this embodiment: the radius r and height h of the first hollow column 901 on the perforated plate 9 of the soil extractor can be designed according to experimental needs. The mass of soil completely removed from the soil extractor is calculated using the formula π×r²×h×soil bulk density=soil mass. According to this mass, the corresponding leaching liquid is added to the second hollow column 1001 on the perforated plate 10 of the container to perform the leaching operation.

[0057] In order to facilitate understanding of the above technical solution of the present invention, the working principle or operation mode of the present invention in the actual process is described in detail below:

[0058] Before loading soil into the root box body 1 and positioning fertilization, first, the front baffle plate 3 and the back baffle plate 2 are combined on the front and back sides of the root box body 1, and then the protrusion 5 is fixed with the clamping block 6 and the limit block 61 connected to the clamping block 6. At this time, since the sum of the thicknesses of the blocking plate 7 and the limit block 61 is equal to the thickness of the protrusion 5, after the clamping block 6 and the limit block 61 cooperate to complete the fixation of the front baffle plate 3, the back baffle plate 2 and the root box body 1, the blocking plate 7 can be directly inserted from the top into the gap between the limit block 61 and the front baffle plate 3 or between the limit block 61 and the back baffle plate 2. At this time, the insertion holes 4 on the front baffle plate 3 and the back baffle plate 2 are blocked by the blocking plate 7. Therefore, the front baffle plate 3, the back baffle plate 2 and the root box body 1 together form a container with an upper penetration. After that, the soil can be loaded into the root box body 1 and the positioning fertilization operation can be carried out.

[0059] When the soil in the root box body 1 needs to be collected for testing, the soil in the root box body 1 can be collected in the following two ways:

[0060] The first collection method can be divided into the following steps (such as Figure 1 shown):

[0061] A1: First, install the sealing plate 7 on the reverse baffle 2 of the root box body 1 along the Figure 1 Slide vertically in the opposite direction of the arrow in the figure to expose the socket 4 on the back baffle 2;

[0062] A2: Then, the soil extractor punching plate 9 together with the first hollow column 901 is inserted into the soil inside the root box body 1 through the insertion hole 4 by pressing, so that the soil inside the area to be studied enters the first hollow column 901;

[0063] A3: Then, the soil extractor punching plate 9 together with the first hollow column 901 is taken out from the root box body 1, and the first hollow column 901 is inserted into the second hollow column 1001;

[0064] A4: Insert the solid column 801 on the perforated plate 8 of the soil guide into the first hollow column 901, and force the soil inside the first hollow column 901 into the corresponding second hollow column 1001 to complete the in-situ collection of the soil;

[0065] A5: After determining the soil nutrient content, the spatial distribution of soil nutrients can be analyzed in conjunction with the contour map.

[0066] The second collection method can be divided into the following steps (such as Figure 6 , Figure 7 as well as Figure 8 shown):

[0067] B1: First, remove the two blocking plates 7 and the front baffle 3 on the root box body 1, and then insert the container punching plate 10 into the position originally belonging to the front baffle 3;

[0068] B2: Insert the first hollow column 901 on the soil extractor punching plate 9 horizontally into the insertion hole 4 from one side of the reverse baffle plate 2, and make it penetrate into the soil inside the root box body 1, with the end just inserted into the end of the second hollow column 1001;

[0069] B3: Insert the solid column 801 on the soil guide perforated plate 8 into the first hollow column 901 from the back of the soil extractor perforated plate 9, and use the solid column 801 to push the soil inside the first hollow column 901 into the corresponding second hollow column 1001 to complete the in-situ collection of the soil;

[0070] B4: Finally, after determining the soil nutrient content, the spatial distribution of soil nutrients can be analyzed in conjunction with the contour map.

[0071] It is worth noting here that: first, since the soil in the root box body 1 is collected by using the first hollow column 901, no matter it is inserted into the soil or pulled out from the soil, the soil will not fall off and contaminate each other. With the help of the reverse baffle 2 and the socket 4 to limit the soil, the soil will not be mixed during the insertion and extraction process, making it less likely that the soil in different areas will contaminate each other, thereby making the measured data more accurate; second, since the first hollow column 901 fits with the solid column 801, when the solid column 801 is inserted When the soil is inside the first hollow column 901, the soil taken out from the first hollow column 901 can be completely pushed into the corresponding second hollow column 1001 for collection, so that the amount of collected soil tends to be consistent and the measured data is more accurate; thirdly, by setting the inner diameter of the second hollow column 1001 to be larger than the inner diameter of the first hollow column 901, it is not only convenient for the inspection personnel to insert the first hollow column 901 into the second hollow column 1001, but also convenient for the inspection personnel to quickly take out the soil from the second hollow column 1001 later, which is more convenient.

[0072] Experiment 1: An experiment was conducted using a root box body 1 with a length of 32 cm, a height of 32 cm, and a thickness of 5 cm. After the experiment, soil was taken using the device of the present invention. The experimental process is as follows:

[0073] The research accuracy of soil nutrient distribution was set at 5 cm, that is, the distance between the cylinders of the soil sampler was 5 cm. A total of 36 points were collected in the root box body 1. By measuring the nitrate nitrogen content of each soil sample, the distribution of nitrate nitrogen content in the root box soil was found as follows: Fig. 9 shown.

[0074] Experiment 2: The experiment was carried out using a root box body 1 with a length of 32 cm, a height of 32 cm, and a thickness of 5 cm. After the experiment, soil was taken using the device of the invention. The experimental process was as follows:

[0075] The research accuracy of soil nutrient distribution was set at 5 cm, that is, the distance between the cylinders of the soil sampler was 5 cm. A total of 36 points were collected in the root box body 1. By measuring the available phosphorus content of each soil sample, the distribution of available phosphorus content in the root box soil was found as follows: Fig.10 shown.

[0076] Experiment 3: The experiment was carried out using a root box with a length of 18 cm, a height of 18 cm, and a thickness of 5 cm. After the experiment, soil was collected using the device of the present invention. The experimental process was as follows:

[0077] The research accuracy of soil nutrient distribution was set at 3 cm, that is, the distance between the cylinders of the soil sampler was 3 cm. A total of 36 points were collected in the root box body 1. By measuring the nitrate nitrogen content of each soil sample, the distribution of ammonium nitrogen content in the root box soil was found as follows: Fig.11 shown.

[0078] Experiment 4: A root box with a length of 32 cm, a height of 32 cm, and a thickness of 5 cm was used to carry out the experiment. After the experiment, soil was taken using the device of the present invention. The experimental process is as follows:

[0079] The research accuracy of soil nutrient distribution was set at 5 cm, that is, the distance between the cylinders of the soil sampler was 5 cm. A total of 36 points were collected in the root box body 1. By measuring the ammonium nitrogen content of each soil sample, the distribution of ammonium nitrogen content in the root box soil was found as follows: Fig.12 shown.

[0080] Based on the distribution of available phosphorus or ammonium nitrogen in the root box soil in the above experiment, the following conclusions can be drawn:

[0081] 1. By using the root box body 1, the soil sampler punching plate 9, the soil guide punching plate 8 and the container punching plate 10 to take samples from the root box body 1, the problem of errors in data detection results caused by soil contamination in different areas during the sampling process is effectively avoided;

[0082] 2. By setting the distances between the first hollow columns 901, the second hollow columns 1001, and the solid columns 801 to different distances, the research accuracy of the soil nutrient distribution in the root box body 1 can be changed. When the distances between the first hollow columns 901, the second hollow columns 1001, and the solid columns 801 are larger, the research accuracy is lower; when the distances between the first hollow columns 901, the second hollow columns 1001, and the solid columns 801 are smaller, the research accuracy is higher.

[0083] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for conveniently analyzing soil nutrient distribution in a root box, characterized in that: It comprises a root box body (1), a soil extractor perforated plate (9), a soil guide perforated plate (8) and a container perforated plate (10); The root box body (1) is of a U-shaped structure; a rear baffle (2) and a front baffle (3) are respectively provided on the front and rear sides of the root box body (1); protrusions (5) are fixedly connected to the outer sides of both sides of the front baffle (3) and the rear baffle (2); a plurality of clamping blocks (6) are slidably connected between the corresponding protrusions (5), and the clamping blocks (6) are of a U-shaped structure; and limiting blocks (61) are fixedly connected to both ends of the clamping blocks (6); The front baffle plate (3) and the back baffle plate (2) are provided with corresponding insertion holes (4); a sealing plate (7) is detachably provided between the front baffle plate (3) and the clamping block (6) and between the back baffle plate (2) and the clamping block (6); The soil extractor perforated plate (9) is fixedly connected to a first hollow column (901) at a position corresponding to the mesh hole; the soil guide perforated plate (8) is fixedly connected to a solid column (801); and the container perforated plate (10) is fixedly connected to a second hollow column (1001); The upper and lower ends of the first hollow column (901) are of a through-type structure; the solid column (801) and the first hollow column (901) fit together; the upper and lower ends of the second hollow column (1001) are of a through-type structure; one end of the second hollow column (1001) away from the container perforated plate (10) is threadedly connected to a sealing head (1002); The inner diameter of the second hollow column (1001) is greater than the inner diameter of the first hollow column (901); The soil extractor perforated plate (9), soil guide perforated plate (8) and container perforated plate (10) are composed of plates with a flat mesh surface and uniform mesh holes, and the mesh holes correspond to the insertion holes (4) one by one; The spacing between the first hollow columns (901), between the second hollow columns (1001), and between the solid columns (801) can be changed; and the positions of the insertion holes (4), the first hollow columns (901), the second hollow columns (1001), and the solid columns (801) correspond one to one.

2. A device for conveniently analyzing soil nutrient distribution in a root box according to claim 1, characterized in that: The length of the first hollow column (901) is equal to or slightly greater than the thickness of the root box body (1).

3. A device for conveniently analyzing soil nutrient distribution in a root box according to claim 1, characterized in that: The width of the soil guide perforated plate (8) and the soil extractor perforated plate (9) is equal to the distance between the protrusions (5) on the same side.

4. A device for conveniently analyzing soil nutrient distribution in a root box according to claim 1, characterized in that: The sum of the thicknesses of the blocking plate (7) and the limiting block (61) is equal to the thickness of the protrusion (5).

5. A method for using a device for conveniently analyzing soil nutrient distribution in a root box, using a device for conveniently analyzing soil nutrient distribution in a root box as claimed in any one of claims 1 to 4, characterized in that: The soil collection step in the root box body (1) comprises the following steps: A1: Slide the blocking plate (7) on one side of the reverse baffle (2) on the root box body (1) vertically in the opposite direction to expose the insertion hole (4) on the reverse baffle (2); A2: inserting the soil sampler punching plate (9) together with the first hollow column (901) from the insertion hole (4) into the soil inside the root box body (1) by pressing, so that the soil inside the area to be studied enters the first hollow column (901); A3: Take the soil extractor punching plate (9) together with the first hollow column (901) out of the root box body (1), and insert the first hollow column (901) into the second hollow column (1001); A4: Insert the solid column (801) on the perforated plate (8) of the soil guide into the first hollow column (901), forcing the soil inside the first hollow column (901) to enter the corresponding second hollow column (1001), thereby completing the in-situ collection of the soil; A5: After determining the soil nutrient content, analyze the spatial distribution of soil nutrients in combination with contour maps.

6. A method for using a device for conveniently analyzing soil nutrient distribution in a root box, using a device for conveniently analyzing soil nutrient distribution in a root box as claimed in any one of claims 1 to 4, characterized in that: The soil collection step in the root box body (1) comprises the following steps: B1: Remove the two blocking plates (7) and the front baffle (3) on the root box body (1), and then insert the container punching plate (10) into the position originally belonging to the front baffle (3); B2: Insert the first hollow column (901) on the soil extractor punching plate (9) horizontally into the insertion hole (4) from one side of the reverse baffle plate (2), and allow it to penetrate into the soil inside the root box body (1), with the end portion just inserted into the end portion of the second hollow column (1001); B3: inserting the solid column (801) on the perforated plate (8) of the soil guide into the first hollow column (901) from the back side of the perforated plate (9) of the soil extractor, and using the solid column (801) to push the soil inside the first hollow column (901) into the corresponding second hollow column (1001), thereby completing the in-situ collection of the soil; B4: After determining the soil nutrient content, analyze the spatial distribution of soil nutrients in combination with contour maps.

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