Method for monitoring and evaluating irrigation uniformity of underground drip irrigation

Abstract

The invention discloses a method for monitoring and evaluating the irrigation uniformity of underground drip irrigation, and relates to the field of irrigation and water conservancy. Comprising the following steps: selecting a branch pipe unit in a branch pipe rotation irrigation group for field underground drip irrigation, and selecting three drip irrigation belts at the front, middle and rear parts of the branch pipe unit at equal intervals; respectively arranging a pressure observation point at the head end and the tail end of each drip irrigation belt, and installing a pressure measuring device to measure the actually measured pressure value Pm; calculating the dripper flow qm at each pressure measuring device according to the actually measured pressure value Pm; the irrigation uniformity CU1 is calculated according to the dripper flow qm; a soil moisture content observation point is arranged at the corresponding position where the pressure measuring device is installed, and a PR2 soil profile moisture tacheometer is installed; after irrigation, adopting a PR2 soil profile moisture tacheometer to observe the soil moisture content of the soil layer in the preset range of each moisture content observation point within the preset time, and measuring once every preset depth interval; calculating the average value of the soil moisture content of each different depth; calculating the average value of the soil moisture content of each observation point; calculating the soil moisture distribution uniformity CU2 by utilizing a Criswensen formula by utilizing the average value of the soil moisture content of each observation point; calculating the irrigation uniformity CU of the underground drip irrigation according to the CU1 and the CU2; and evaluating the uniformity of the underground drip irrigation according to the uniformity CU of the underground drip irrigation, wherein the evaluation grades comprise excellent, good, general and poor. The method is easy and convenient to operate, economical and practical, the irrigation uniformity of subsurface drip irrigation can be accurately evaluated, more accurate irrigation water effective utilization coefficient evaluation can be provided, actual production requirements can be better met, subsurface drip irrigation can be promoted to be applied to production practice, and the water saving efficiency can be further improved.

Description

Technical Field

[0001] The invention relates to the field of farmland water conservancy, and in particular to a method for monitoring and evaluating the uniformity of underground drip irrigation. Background Art

[0002] Field evaluation of irrigation system irrigation uniformity is an important basis for detecting and judging the quality of system design, the basis for system management, and an important reference for diagnosing whether the system facilities are intact. At present, the evaluation methods for irrigation system irrigation uniformity can be divided into two categories. One is the indirect method, which believes that the main factor affecting uniformity is the working pressure of the system. It is usually calculated by monitoring the pressure and flow distribution of the system and the relationship between the outflow and pressure of the emitter. The second category is to directly measure the distribution of irrigation water to evaluate the irrigation uniformity. For irrigation methods that can directly observe irrigation water on the surface, such as surface irrigation, sprinkler irrigation, surface drip irrigation, etc., a certain number of rain gauges can be laid in the field to observe the distribution of irrigation water, or the distribution of soil moisture after irrigation can be observed according to a certain sampling method, so as to evaluate the irrigation uniformity of the irrigation system. Since the capillary tubes and emitters of underground drip irrigation are buried underground, it is inconvenient to directly observe and measure their water output. Even if the method of digging up the underground drip irrigation capillary tube is used to evaluate its uniformity, it is difficult to obtain convincing results. After all, the outflow of the dripper after digging it out is different from the actual situation. Therefore, the observation and evaluation of the irrigation uniformity of the field underground drip irrigation system has become a difficult point.

[0003] There are two main ways to evaluate the uniformity of underground drip irrigation systems: one is to evaluate the uniformity of underground irrigation systems, and evaluate the impact of different technical parameters on irrigation uniformity from aspects such as emitter manufacturing deviation, soil water movement and capillary hydraulics. The other is to evaluate the effectiveness of crops. The real irrigation uniformity should be the uniformity of soil water distribution after irrigation. However, due to soil variability and soil water redistribution, the uniformity of irrigation water distribution is not completely equivalent to the uniformity of soil water distribution. Both of these methods for evaluating the uniformity of underground irrigation systems have their defects and shortcomings. These two evaluation methods can be combined and improved to form a new method for evaluating the uniformity of underground irrigation systems.

[0004] Therefore, it is an urgent problem for those skilled in the art to propose a new monitoring system and evaluation method for underground drip irrigation uniformity to achieve accurate and reasonable evaluation of underground drip irrigation uniformity. Summary of the invention

[0005] In view of this, the present invention provides a method for monitoring and evaluating the uniformity of underground drip irrigation, which can solve the problems existing in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A method for monitoring and evaluating the uniformity of underground drip irrigation comprises the following steps:

[0008] S1. Select a branch pipe unit in a branch pipe rotation irrigation group of field underground drip irrigation, and select three drip irrigation belts at equal distances in front, middle and rear of the branch pipe unit;

[0009] S2. Set a pressure observation point at the beginning and end of the three drip irrigation belts and install a pressure measuring device to measure the actual pressure value P. m ;

[0010] S3, according to the measured pressure value P m Calculate the dripper flow rate q at each pressure measuring device m ;

[0011] S4, according to the dripper flow q m Calculate irrigation uniformity CU1;

[0012] S5. Set up a soil moisture observation point at the corresponding position where the pressure measuring device is installed, and install the PR2 soil profile moisture rapid tester;

[0013] S6. After irrigation, use a PR2 soil profile moisture rapid tester to measure the soil moisture content of each soil layer within the preset range of each moisture observation point at a preset time, and measure once at every preset depth interval;

[0014] S7. Calculate the average soil moisture content at each different depth

[0015] S8. Calculate the average soil moisture content at each observation point

[0016] S9. Calculate soil moisture distribution uniformity CU2 using the Christiansen formula;

[0017] S10, calculating the underground drip irrigation uniformity CU based on CU1 and CU2;

[0018] S11. Evaluate the underground drip irrigation uniformity according to the underground drip irrigation uniformity CU, and the evaluation levels include excellent, good, general and poor.

[0019] In the above method, optionally, the branch pipe irrigation group in S1 is composed of one or more branch pipes. Any branch pipe unit is selected, and there is a difference in water flow rate in the front, middle and rear parts of the branch pipe unit. Three drip irrigation belts are selected at equal distances in the front, middle and rear parts of the branch pipe unit, namely drip irrigation belts B9, B10 and B11.

[0020] The above method is optional. In S2, a pressure observation point is set at the beginning and end of each of the three drip irrigation belts and a pressure measuring device is installed, which are pressure measuring devices A3, A4, A5, A3, A7, and A8 respectively. The pressure value P of each pressure measuring device is m Respectively represent P m1 , P m2 , P m3 , P m4 , P m5 , P m6 .

[0021] In the above method, optionally, in S3, according to the measured pressure value P m Calculate the dripper flow rate q at each pressure measuring device m , respectively denoted as q m1 ,q m2 ,q m3 ,q m4 ,q m5 ,q m6 ;

[0022] The pressure-flow formula of the drip irrigation belt is:

[0023]

[0024] Among them, q m is the actual flow rate of the emitter after correction; q0 is the working flow rate of the emitter before correction; P m is the measured pressure; P0 is the working pressure; t is the emitter flow index.

[0025] The above method, optionally, in S4, according to the dripper flow q m Calculate irrigation uniformity CU1:

[0026]

[0027] Among them, qi is the actual flow rate at the i-th observation point; is the mean flow rate of the observation point; N is the number of flow rates at the observation point.

[0028] In the above method, optionally, the Christiansen formula is used in S9 to calculate the soil moisture distribution uniformity CU2:

[0029]

[0030] Among them, θ i is the soil moisture content at the i-th observation point; is the mean soil moisture content of the observation points; N is the number of soil moisture contents at the observation points.

[0031] In the above method, optionally, in S10, the underground drip irrigation uniformity CU is calculated according to CU1 and CU2:

[0032]

[0033] In the above method, optionally, in S11, when 90≤CU≤100, the evaluation level is excellent;

[0034] When 80≤CU<90, the evaluation level is good;

[0035] When 70≤CU<80, the evaluation level is general;

[0036] When CU<70, the evaluation level is poor.

[0037] It can be seen from the above technical solution that compared with the prior art, the present invention provides a method for monitoring and evaluating the uniformity of underground drip irrigation, which can more accurately evaluate the uniformity of underground drip irrigation, and the evaluation of the effective utilization coefficient of irrigation water provided is more accurate, more in line with actual production needs, and further improves the water-saving efficiency of drip irrigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0039] Figure 1 A flow chart of a method for monitoring and evaluating the uniformity of underground drip irrigation disclosed in the present invention;

[0040] Figure 2 A schematic diagram of the structure disclosed in an embodiment of the present invention;

[0041] Among them, 1-branch unit; 2-branch; A3-first pressure measuring device, A4-second pressure measuring device, A5-third pressure measuring device, A6-fourth pressure measuring device, A7-fifth pressure measuring device, A8-sixth pressure measuring device; B9-first drip irrigation belt, B10-second drip irrigation belt, B11-third drip irrigation belt; Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ and Ⅵ are the first observation point, second observation point, third observation point, fourth observation point, fifth observation point and sixth observation point of PR2 soil profile moisture rapid tester respectively. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in 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.

[0043] In this application, relational terms such as first and second, etc. are used only 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. 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. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0044] Reference Figure 1 As shown, the present invention discloses a method for monitoring and evaluating the uniformity of underground drip irrigation, comprising the following steps:

[0045] S1. Select a branch pipe unit in a branch pipe rotation irrigation group of field underground drip irrigation, and select three drip irrigation belts at equal distances in front, middle and rear of the branch pipe unit;

[0046] S2. Set a pressure observation point at the beginning and end of the three drip irrigation belts and install a pressure measuring device to measure the actual pressure value P. m (MPa);

[0047] S3, according to the measured pressure value P m (MPa) Calculate the dripper flow rate q at each pressure measuring device m ;

[0048] S4, according to the dripper flow q m Calculate irrigation uniformity CU1 (%);

[0049] S5. Set up a soil moisture observation point at the corresponding position where the pressure measuring device is installed, and install the PR2 soil profile moisture rapid tester;

[0050] S6. 24 hours after irrigation, use the PR2 soil profile moisture rapid tester to observe the soil moisture content of the 0-100 cm soil layer at each moisture observation point, and measure once every 20 cm;

[0051] S7. Calculate the average soil moisture content at 6 different depths

[0052] S8. Calculate the average soil moisture content at 6 observation points

[0053] S9. Calculate soil moisture distribution uniformity CU2 (%) using the Christiansen formula;

[0054] S10, calculating the underground drip irrigation uniformity CU (%) according to CU1 and CU2;

[0055] S11. Evaluate the underground drip irrigation uniformity according to the underground drip irrigation uniformity CU (%), and the evaluation levels include excellent, good, general and poor.

[0056] Furthermore, the branch pipe irrigation group in S1 is composed of one or more branch pipes. When any branch pipe unit is selected, there is a difference in water flow velocity in the front, middle and rear parts of the branch pipe unit. Three drip irrigation belts are selected at equal distances in the front, middle and rear parts of the branch pipe unit, namely the first drip irrigation belt B9, the second drip irrigation belt B10 and the third drip irrigation belt B11.

[0057] Furthermore, in S2, a pressure observation point is set at the head end and the end end of each of the three drip irrigation belts and a pressure measuring device is installed, which are the first pressure measuring device A3, the second pressure measuring device A4, the third pressure measuring device A5, the fourth pressure measuring device A6, the fifth pressure measuring device A7, and the sixth pressure measuring device A8. The measured pressure value P of each pressure measuring device is m Respectively represent P m1 , P m2 , P m3 , P m4 , P m5 , P m6 .

[0058] Further, in S3, according to the measured pressure value P m Calculate the dripper flow rate q at each pressure measuring device m , respectively denoted as q m1 ,q m2 ,q m3 ,q m4 ,q m5 ,q m6 ;

[0059] The pressure-flow formula of the drip irrigation belt is:

[0060]

[0061] Among them, q mis the actual flow rate of the emitter after correction (L / h); q0 is the working flow rate of the emitter before correction (L / h); P m is the measured pressure (MPa); P0 is the working pressure (MPa); t is the emitter flow index.

[0062] Further, in S4, according to the dripper flow q m Calculate irrigation uniformity CU1:

[0063]

[0064] Among them, qi is the actual flow rate at the i-th observation point; is the mean flow rate of the observation point; N is the number of flow rates at the observation point.

[0065] Specifically, refer to Figure 2 As shown, it includes: branch pipe unit 1; branch pipe 2; first pressure measuring device A3, second pressure measuring device A4, third pressure measuring device A5, fourth pressure measuring device A6, fifth pressure measuring device A7, sixth pressure measuring device A8; first drip irrigation belt B9, second drip irrigation belt B10, third drip irrigation belt B11; first observation point Ⅰ, second observation point Ⅱ, third observation point Ⅲ, fourth observation point Ⅳ, fifth observation point Ⅴ and sixth observation point Ⅵ of PR2 soil profile moisture rapid tester. Soil moisture observation points are set at the corresponding positions where the pressure measuring devices are installed, and PR2 soil profile moisture rapid tester is installed, which are numbered Ⅰ, Ⅱ, Ⅲ, Ⅳ, Ⅴ, Ⅵ respectively. 24 hours after irrigation, the PR2 soil profile moisture rapid tester is used to observe the soil moisture content of the 0-100cm soil layer of each moisture observation point, and the depth is measured every 20cm. The different moisture contents θ measured at the same depth are recorded as: θ0, θ 20 ,θ 40 ,θ 60 ,θ 80 ,θ 100 .

[0066] Specifically, the average water content at 6 different depths of 0cm, 20cm, 40cm, 60cm, 80cm, and 100cm is calculated. The formula is as follows:

[0067]

[0068] Among them, θ0 represents the soil moisture content at the same observation point as above, at a depth of 0 cm; similarly, θ 20 represents the soil moisture content at a depth of 20 cm at the same observation point mentioned above. Similarly, θ 100 It represents the soil moisture content at a depth of 100 cm at the same observation point mentioned above.

[0069] Furthermore, the Christiansen formula is used in S9 to calculate the soil moisture distribution uniformity CU2:

[0070]

[0071] Among them, θ i is the soil moisture content at the i-th observation point; is the mean soil moisture content of the observation points; N is the number of soil moisture contents at the observation points.

[0072] Furthermore, in S10, the underground drip irrigation uniformity CU (%) is calculated based on CU1 and CU2:

[0073]

[0074] Furthermore, in S11, when 90≤CU≤100, the evaluation level is excellent;

[0075] When 80≤CU<90, the evaluation level is good;

[0076] When 70≤CU<80, the evaluation level is general;

[0077] When CU<70, the evaluation level is poor.

[0078] The specific application examples of the present invention are as follows:

[0079] Example 1

[0080] based on Figure 2 The structure shown, a monitoring system and evaluation method for underground drip irrigation uniformity, includes the following steps:

[0081] S1. An underground drip irrigation experiment was conducted at the No. 2 site of the first station of Shihezi Fruit Company. A branch pipe unit in a branch pipe rotation irrigation group of field underground drip irrigation was selected, and three drip irrigation belts were selected at equal distances in front, middle and rear of the branch pipe unit;

[0082] S2. Set a pressure observation point at the beginning and end of the three drip irrigation belts and install a pressure measuring device to measure the actual pressure values ​​P1 = 0.15MPa, P2 = 0.18MPa, P3 = 0.21MPa, P4 = 0.16MPa, P5 = 0.20MPa, P6 = 0.19MPa;

[0083] S3, according to the measured pressure value P m Calculate the dripper flow rate at each pressure measuring device q1 = 1.25 L / h, q2 = 2.05 L / h, q3 = 3.75 L / h, q4 = 2.15 L / h, q5 = 3.47 L / h, q6 = 3.14 L / h; calculate the average dripper flow rate q i =1.169L / h;

[0084] S4, according to the dripper flow q m Calculate irrigation uniformity

[0085]

[0086] S5. Set up a soil moisture observation point at the corresponding position where the pressure measuring device is installed, and install the PR2 soil profile moisture rapid tester;

[0087] S6. 48 hours after irrigation, use the PR2 soil profile moisture rapid tester to observe the soil moisture content of each soil layer within the preset range of the moisture content observation point, and measure once every 20 cm;

[0088] S7. Calculate the average soil moisture content at each different depth

[0089] S8. Calculate the average soil moisture content at each observation point

[0090] S9. Calculate soil moisture distribution uniformity using the Christiansen formula

[0091]

[0092] S10, calculating the underground drip irrigation uniformity CU=91 based on CU1 and CU2; further, because 90≤CU≤100, the evaluation level is excellent;

[0093] Example 2

[0094] based on Figure 2 The structure shown, a monitoring system and evaluation method for underground drip irrigation uniformity, includes the following steps:

[0095] S1. The difference of this embodiment is that the experimental site is located in the Second Horticulture Field of Hongxing Field, the 13th Division of the Production and Construction Corps, and the operation steps are the same as those of Example 1;

[0096] S2, measured pressure values ​​P1 = 0.16MPa, P2 = 0.19MPa, P3 = 0.22MPa, P4 = 0.17MPa, P5 = 0.19MPa, P6 = 0.15MPa;

[0097] S3, according to the measured pressure value P m Calculate the dripper flow rate at each pressure measuring device q1 = 1.25L / h,

[0098] q2 = 2.05 L / h, q3 = 3.75 L / h, q4 = 2.15 L / h, q5 = 3.47 L / h, q6 = 3.14 L / h; calculate the average

[0099] Dripper flow rate q i =1.169L / h;

[0100] S4, according to the dripper flow q m Calculate irrigation uniformity

[0101]

[0102] S5. Set up a soil moisture observation point at the corresponding position where the pressure measuring device is installed, and install the PR2 soil profile moisture rapid tester;

[0103] S6. 48 hours after irrigation, use the PR2 soil profile moisture rapid tester to observe the soil moisture content of each soil layer within the preset range of the moisture content observation point, and measure once every 20 cm;

[0104] S7. Calculate the average soil moisture content at each different depth

[0105] S8. Calculate the average soil moisture content at each observation point

[0106] S9. Calculate soil moisture distribution uniformity using the Christiansen formula

[0107]

[0108] S10, calculating the underground drip irrigation uniformity CU=87.5 based on CU1 and CU2; further, because 80≤CU<90, the evaluation level is good;

[0109] Example 3

[0110] based on Figure 2 The structure shown, a monitoring system and evaluation method for underground drip irrigation uniformity, includes the following steps:

[0111] S1. The difference of this embodiment is that the experimental site is located in the Shihezi Xiayedi reclamation area, and the operation steps are the same as those of embodiment 1;

[0112] S2, measured pressure values ​​P1 = 0.31MPa, P2 = 0.25MPa, P3 = 0.28MPa, P4 = 0.33MPa, P5 = 0.22MPa, P6 = 0.24MPa;

[0113] S3, according to the measured pressure value P m Calculate the dripper flow rate at each pressure measuring device q1 = 5.26L / h,

[0114] q2 = 2.14 L / h, q3 = 3.95 L / h, q4 = 4.59 L / h, q5 = 2.56 L / h, q6 = 1.15 L / h; calculate the average

[0115] Dripper flow rate q i =3.7L / h;

[0116] S4, according to the dripper flow q m Calculate irrigation uniformity

[0117]

[0118] S5. Set up a soil moisture observation point at the corresponding position where the pressure measuring device is installed, and install the PR2 soil profile moisture rapid tester;

[0119] S6. 48 hours after irrigation, use the PR2 soil profile moisture rapid tester to observe the soil moisture content of each soil layer within the preset range of the moisture content observation point, and measure once every 20 cm;

[0120] S7. Calculate the average soil moisture content at each different depth

[0121] S8. Calculate the average soil moisture content at each observation point

[0122] S9. Calculate soil moisture distribution uniformity using the Christiansen formula

[0123]

[0124] S10. Calculate the underground drip irrigation uniformity CU=86.5 based on CU1 and CU2. Furthermore, because 80≤CU<90, the evaluation level is good.

[0125] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0126] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for monitoring and evaluating the uniformity of underground drip irrigation, characterized in that: The following steps are involved: S1. Select a branch pipe unit in a branch pipe rotation irrigation group of field underground drip irrigation, and select three drip irrigation belts at equal distances in front, middle and rear of the branch pipe unit; S2. Set a pressure observation point at the beginning and end of the three drip irrigation belts and install a pressure measuring device to measure the actual pressure value P. m ; S3, according to the measured pressure value P m Calculate the dripper flow rate q at each pressure measuring device m ; S4, according to the dripper flow q m Calculate irrigation uniformity CU1; S5. Set up a soil moisture observation point at the corresponding position where the pressure measuring device is installed, and install the PR2 soil profile moisture rapid tester; S6. After irrigation, use the PR2 soil profile moisture rapid tester to measure the soil moisture content of each soil layer within the preset range of each moisture observation point at a preset time, and measure once at every preset depth interval; S7. Calculate the average soil moisture content at each different depth S8. Calculate the average soil moisture content at each observation point S9. Calculate soil moisture distribution uniformity CU2 using the Christiansen formula; S10, calculating the underground drip irrigation uniformity CU based on CU1 and CU2; S11. Evaluate the underground drip irrigation uniformity according to the underground drip irrigation uniformity CU, and the evaluation levels include excellent, good, general and poor.

2. A method for monitoring and evaluating the uniformity of underground drip irrigation according to claim 1, characterized in that: The branch pipe rotation irrigation group in S1 is composed of one or more branch pipes. When any branch pipe unit is selected, the water flow velocity in the front, middle and rear parts of the branch pipe unit is different. Three drip irrigation belts are selected at equal distances in the front, middle and rear parts of the branch pipe unit, namely drip irrigation belts B9, B10 and B11.

3. The method for monitoring and evaluating the uniformity of underground drip irrigation according to claim 1, characterized in that: In S2, a pressure observation point is set at the beginning and end of each of the three drip irrigation belts and a pressure measuring device is installed, namely pressure measuring devices A3, A4, A5, A3, A7, and A8. The measured pressure value P of each pressure measuring device is m Respectively represent P m1 , P m2 , P m3 , P m4 , P m5 , P m6 .

4. The method for monitoring and evaluating the uniformity of underground drip irrigation according to claim 1, characterized in that: In S3, according to the measured pressure value P m Calculate the dripper flow rate q at each pressure measuring device m , respectively denoted as q m1 ,q m2 ,q m3 ,q m4 ,q m5 ,q m6 ; The pressure-flow formula of the drip irrigation belt is: Among them, q m is the actual flow rate of the emitter after correction; q0 is the working flow rate of the emitter before correction; P m is the measured pressure; P0 is the working pressure; t is the emitter flow index.

5. The method for monitoring and evaluating the uniformity of underground drip irrigation according to claim 1, characterized in that: In S4, according to the dripper flow q m Calculate irrigation uniformity CU1: Among them, qi is the actual flow rate at the i-th observation point; is the mean flow rate of the observation point; N is the number of flow rates at the observation point.

6. The method for monitoring and evaluating the uniformity of underground drip irrigation according to claim 1, characterized in that: In S9, the Christiansen formula is used to calculate the soil moisture distribution uniformity CU2: Among them, θ i is the soil moisture content at the i-th observation point; is the mean soil moisture content of the observation points; N is the number of soil moisture contents at the observation points.

7. The method for monitoring and evaluating the uniformity of underground drip irrigation according to claim 1, characterized in that: In S10, the underground drip irrigation uniformity CU is calculated based on CU1 and CU2:

8. The method for monitoring and evaluating the uniformity of underground drip irrigation according to claim 1, characterized in that: In S11, when 90≤CU≤100, the evaluation level is excellent; When 80≤CU<90, the evaluation level is good; When 70≤CU<80, the evaluation level is general; When CU<70, the evaluation level is poor.

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