Evaluation method for effect of treating tail water of land-based culture system in paddy field

Abstract

The invention discloses a method for evaluating the effect of treating tail water of a land-based culture system in a paddy field, and relates to the technical field of agro-ecology, and the method is characterized by comprising the following steps: setting a land-based culture system test model in a rice-fish combined cropping mode; repeatedly sampling the paddy field water body, the breeding tail water and the land-based breeding system inlet water according to the preset loci; detecting water quality twice a week; applying fertilizer to the paddy field in the third circumference and the fourth circumference respectively; respectively recording data of a tillering stage, a jointing booting stage, a heading stage and a flowering stage according to the growth stage of the rice; and carrying out statistical analysis on the detection result, and comparing water quality parameter differences among different sampling groups so as to evaluate the treatment effect of the paddy field on the breeding tail water. Through scientific experimental design and comprehensive water quality detection, the treatment effect of the paddy field on the breeding tail water is accurately evaluated, technical support is provided for sustainable development of a rice-fish combined cropping system, and the method has important theoretical and practical significance for reducing agricultural non-point source pollution and protecting the ecological environment.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural ecology, and more specifically, it relates to a method for evaluating the effect of treating the tail water of a land-based aquaculture system in a paddy field. Background Art

[0002] In modern agricultural production, "rice-fish co-culture" is an ecological agriculture model that mainly realizes the recycling of resources and the balance of the ecosystem through the combination of paddy fields and aquaculture. However, in the implementation of this model, the residual baits and excreta in land-based fish ponds, as well as the field management measures such as fertilization and pesticide application in rice production, have had a significant impact on the water quality status, farmland ecological environment, and agricultural non-point source pollution status. These factors not only affect the survival and growth of cultured fish but also pose a threat to the sustainable development of the entire agricultural ecosystem.

[0003] Traditional methods for treating aquaculture tail water have many problems, such as high treatment costs, low efficiency, and secondary pollution to the environment. Therefore, it is particularly important to find an economical, efficient, and environmentally friendly method for treating tail water. As a natural ecological filtration system, paddy fields have the potential to treat aquaculture tail water. However, existing research mainly focuses on the monitoring of single water quality parameters, and there is less comprehensive evaluation of the treatment effect of paddy fields on tail water at different growth stages. At present, the evaluation method for the effect of paddy fields in treating the tail water of land-based aquaculture systems is not perfect, lacking systematic research and a scientific evaluation system.

[0004] Therefore, the present invention aims to provide a method for evaluating the effect of treating the tail water of a land-based aquaculture system in a paddy field to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a method for evaluating the effect of treating the tail water of a land-based aquaculture system in a paddy field. Through scientific experimental design and comprehensive water quality detection, the present invention accurately evaluates the treatment effect of paddy fields on aquaculture tail water, provides technical support for the sustainable development of the rice-fish co-culture system, and has important theoretical and practical significance for reducing agricultural non-point source pollution, achieving the goal of "using one water for multiple purposes and multiple harvests", promoting the "quality improvement and efficiency increase" of the healthy breeding industry of green ecological and efficient rice-fish co-culture, and protecting the ecological environment.

[0006] The above technical object of the present invention is achieved through the following technical solutions: A method for evaluating the effect of treating the tail water of a land-based aquaculture system in a paddy field includes the following steps:

[0007] S1. Set up an experimental model of a land-based aquaculture system under the rice-fish co-culture mode;

[0008] S2. Repeatedly sample the water body of the paddy field, aquaculture tail water, and the influent water of the land-based aquaculture system at predetermined positions;

[0009] S3. Detect the water quality twice a week. The detection parameters include pH, temperature, dissolved oxygen, total ammonia nitrogen, nitrite nitrogen, total nitrogen, total phosphorus, chemical oxygen demand, and suspended solids.

[0010] S4. During the experiment, fertilize the paddy fields in the third week and the fourth week respectively. Use compound fertilizer and urea in the third week, and water-soluble fertilizer in the fourth week.

[0011] S5. According to the growth stages of the rice, record the data of the tillering stage, jointing-booting stage, heading stage, and flowering stage respectively.

[0012] S6. Conduct statistical analysis on the detection results, compare the differences in water quality parameters between different sampling groups, so as to evaluate the treatment effect of the paddy field on the aquaculture tail water.

[0013] The present invention is further configured as follows: In the experimental model of the land-based aquaculture system in step S1, there are 15 aquaculture barrels. Among them, 6 barrels are stocked with hybrid snakeheads with an average weight range of 240 - 261 g, 25 fish in each barrel. The other 9 barrels are stocked with hybrid snakeheads with an average weight range of 136 - 141 g, 25 fish in each barrel. During the aquaculture process, apparent satiation feeding is carried out, and the fish are fed 1 - 2 times a day.

[0014] The present invention is further configured as follows: The process of repeated sampling in step S2 is as follows: Before discharging the aquaculture tail water, take water samples from the paddy field at predetermined points, mix them and record as sampling 1, repeat 3 times; When discharging the aquaculture tail water, collect water samples from the outlet and record as sampling 2, collect water samples from the inlet and record as sampling 3, each repeat 3 times; Before discharging the aquaculture tail water the next day, take water samples from the paddy field again and record as sampling 4, repeat 3 times, and at the same time collect water samples from the inlet and record as sampling 5, repeat 3 times.

[0015] The present invention is further configured as follows: In step S3, the water quality is detected by using a fully automatic water quality detection device to detect pH, temperature, dissolved oxygen, total ammonia nitrogen, and nitrite nitrogen, and a portable multi-parameter water quality detector is used to detect total nitrogen, total phosphorus, chemical oxygen demand, and suspended solids.

[0016] In summary, the present invention has the following beneficial effects:

[0017] 1. The evaluation method of the present invention not only covers the basic parameters of water quality, such as pH, temperature, dissolved oxygen, etc., but also includes key water quality indicators, such as total ammonia nitrogen, nitrite nitrogen, total nitrogen, total phosphorus, chemical oxygen demand, and suspended solids, etc., and can comprehensively evaluate the treatment effect of the paddy field on the aquaculture tail water.

[0018] 2. The present invention ensures the accuracy and reliability of data by collecting water samples at different time points (before discharge, during discharge, after discharge) and different locations (paddy fields, water outlets, water inlets), and conducting repeated detections. In addition, statistical analysis methods are used to determine the significant differences between different sampling groups, further enhancing the scientific nature of the evaluation results;

[0019] 3. The present invention is applicable to rice-fish co-culture systems of different scales, can provide a scientific basis for the treatment of tail water in actual agricultural production, helps to optimize aquaculture and planting management measures, improve resource utilization efficiency, and reduce agricultural non-point source pollution;

[0020] 4. The evaluation method of the present invention utilizes existing water quality detection equipment and simple sampling methods, without the need for additional expensive equipment or complex operation procedures, reducing the implementation cost and improving the economic efficiency of the method;

[0021] 5. The method of the present invention has simple and clear operation steps and is easy to be popularized and applied in actual agricultural production. By regularly detecting and analyzing water quality data, farmers and agricultural technicians can timely understand the treatment effect of paddy fields on tail water, timely adjust aquaculture and planting management measures, and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the experimental model of the rice-fish co-culture system in the embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the water level sampling points of the experimental model of the rice-fish co-culture system in the embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the water quality detection results in the first week and the second week in the embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the water quality detection results in the third week and the fourth week in the embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of the water quality detection results in the fifth week and the sixth week in the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further describes the present invention in detail with reference to the attached Figures 1-5 drawings.

[0028] Embodiment: An evaluation method for the effect of treating the tail water of a land-based aquaculture system in a paddy field

[0029] The reagents involved in this embodiment are shown in Table 1:

[0030] Table 1 Main reagents

[0031]

[0032]

[0033] The main instruments and equipment involved in this embodiment are shown in Table 2:

[0034] Table 2 Main Instruments and Equipment

[0035]

[0036] The test model of this embodiment is as Figure 1 shown, and the relevant information of the test model is shown in Table 3:

[0037] Table 3 Basic Information of the Test Model

[0038]

[0039] There are a total of 15 breeding barrels in this embodiment. Among them, 6 barrels are stocked with hybrid snakehead with an average weight range of 240 - 261 g, 25 fish in each barrel, and the other 9 barrels are stocked with hybrid snakehead with an average weight range of 136 - 141 g, 25 fish in each barrel. During the breeding process, apparent satiation feeding is carried out, and feeding is carried out 1 - 2 times a day.

[0040] The sample collection plan is as Figure 2 shown:

[0041] ① Before discharging the aquaculture tail water, water samples are taken from the paddy field at the indicated sites (the positions shown by the blue triangles, 5 sites). After taking water samples at each site, they are mixed, and the mixed water sample is recorded as 1 replicate. Three water samples are taken according to the above method (the test results are recorded as sampling 1);

[0042] ② When discharging the aquaculture tail water, 3 water samples are collected from the outlet of the aquaculture tail water (the positions shown by the red triangles, the test results are recorded as sampling 2), and 3 water samples are collected from the inlet (the positions shown by the yellow triangles, the test results are recorded as sampling 3);

[0043] ③ Before discharging the aquaculture tail water the next day, water samples are taken from the paddy field (3 water samples are collected, and the operation method is the same as ① above, recorded as sampling 4), and 3 water samples are collected from the inlet (the positions shown by the yellow triangles, the test results are recorded as sampling 5).

[0044] The water quality is detected 2 times a week, and the detection parameters include parameters such as pH, temperature, dissolved oxygen, total ammonia nitrogen, nitrite nitrogen, total nitrogen, total phosphorus, chemical oxygen demand, and suspended solids. Indicators such as pH, temperature, dissolved oxygen, total ammonia nitrogen, and nitrite nitrogen are detected by the automatic water quality detection equipment of Dinghai Technology Co., Ltd., and total nitrogen, total phosphorus, chemical oxygen demand, and suspended solids are detected by the portable multi-parameter water quality detector of Beijing Lianhua Yongxing Technology Development Co., Ltd.

[0045] During the experiment, fertilizers were applied to the paddy fields in the third and fourth weeks. In the third week, compound fertilizers (Zhengtaikangdi, China) and urea (Beijing Jinmei Taiyangshi Chemical Industry Co., Ltd., China) were used, and in the fourth week, Zhuhe 6+1 water-soluble fertilizers (Zhuhe Fertilizer Group Co., Ltd., China) were used. In the first and second weeks, the rice was in the tillering stage, in the third and fourth weeks, it was in the jointing and booting stage, in the fifth week, it was in the heading stage, and in the sixth week, it was in the flowering stage.

[0046] Experimental data

[0047] The water quality test results in the first and second weeks are as Figure 3 shown (where the temperature unit is °C, the dissolved oxygen unit is mg / L, the total ammonia nitrogen unit is mg / L, the nitrite nitrogen unit is mg / L, the total nitrogen unit is mg / L, the total phosphorus unit is mg / L, the chemical oxygen demand unit is mg / L, and the suspended solids unit is mg / L):

[0048] The results of the first water quality test in the first week showed (A-1) that the total ammonia nitrogen and nitrite nitrogen levels in the two sampling groups were significantly higher than those in other sampling groups (P < 0.05). There was no significant difference in the total ammonia nitrogen and nitrite nitrogen levels between sampling group 1 and sampling group 4 (P > 0.05). There was no significant difference in the nitrite nitrogen levels between sampling groups 3 and 5, but the total ammonia nitrogen level in sampling group 5 was significantly lower than that in sampling group 3 (P < 0.05).

[0049] The results of the second water quality test in the first week showed (A-2) that the total ammonia nitrogen, total nitrogen, and chemical oxygen demand levels in sampling group 2 were significantly higher than those in other sampling groups (P < 0.05). The total ammonia nitrogen, total nitrogen, and chemical oxygen demand levels in sampling group 4 and sampling group 5 were significantly lower than those in sampling group 1 and sampling group 3 respectively (P < 0.05); the nitrite nitrogen level in sampling group 2 was significantly higher than that in other sampling groups (P < 0.05), but there was no significant difference between other groups (P > 0.05); the total phosphorus level in sampling group 2 was significantly higher than that in sampling groups 3 and 4 (P < 0.05), and there was no significant difference in the total phosphorus levels between sampling group 1 and sampling group 4, sampling groups 3 and 5 (P > 0.05); the suspended solids in sampling group 2 were significantly higher than those in sampling groups 1 and 5 (P < 0.05), the suspended solids in sampling group 4 were significantly higher than those in sampling group 1 (P > 0.05), and the suspended solids in sampling group 5 were significantly lower than those in sampling group 3 (P < 0.05).

[0050] The results of the first water quality test in the second week showed (B-1) that the total ammonia nitrogen and nitrite nitrogen levels in sampling group 2 were significantly higher than those in other sampling groups (P < 0.05). The total ammonia nitrogen level in sampling group 4 was significantly lower than that in sampling group 1 (P < 0.05), and the total ammonia nitrogen level in sampling group 5 was significantly higher than that in sampling group 3 (P < 0.05). There was no significant difference in the nitrite nitrogen levels between sampling groups 1 and 4 (P > 0.05), and the nitrite nitrogen level in sampling group 5 was significantly higher than that in sampling group 3 (P > 0.05).

[0051] The results of the second water quality test in the second week (B-2) showed that the total ammonia nitrogen levels in the two sampling groups were significantly higher than those in other sampling groups (P>0.05). There was no significant difference in the total ammonia nitrogen levels between sampling groups 1 and 4 (P>0.05). The total ammonia nitrogen level in sampling group 5 was significantly lower than that in sampling group 3 (P<0.05). The nitrite nitrogen level in sampling group 2 was significantly higher than that in other sampling groups (P<0.05), but there was no significant difference among the other groups (P>0.05). The total nitrogen and total phosphorus levels in sampling group 2 were significantly higher than those in other sampling groups (P<0.05). There was no significant difference in the total nitrogen and total phosphorus levels between sampling groups 1 and 4 (P>0.05). The total nitrogen and total phosphorus levels in sampling group 5 were significantly higher than those in sampling group 3 (P<0.05). There was no significant difference in the chemical oxygen demand between sampling groups 1 and 4 (P>0.05). The chemical oxygen demand in sampling group 5 was significantly higher than that in sampling group 3 (P<0.05). The suspended solids in sampling group 2 were significantly higher than those in other sampling groups (P<0.05). There was no significant difference in the suspended solids between sampling groups 1 and 4, and between sampling groups 3 and 5 (P>0.05).

[0052] The water quality test results in the third and fourth weeks are as Figure 4 shown (where the unit of temperature is °C, the unit of dissolved oxygen is mg / L, the unit of total ammonia nitrogen is mg / L, the unit of nitrite nitrogen is mg / L, the unit of total nitrogen is mg / L, the unit of total phosphorus is mg / L, the unit of chemical oxygen demand is mg / L, and the unit of suspended solids is mg / L):

[0053] The results of the first water quality test in the third week (C-1) showed that the total ammonia nitrogen and nitrite nitrogen levels in sampling group 2 were significantly higher than those in other sampling groups (P<0.05), but there was no significant difference among the other groups (P>0.05).

[0054] The results of the second water quality test in the third week (C-2) showed that the total ammonia nitrogen in the two sampled groups was significantly higher than that in the four sampled groups (P>0.05), there was no significant difference between the three sampled groups and the five sampled groups (P>0.05), and the total ammonia nitrogen level in the four sampled groups was significantly lower than that in the one sampled group; the nitrite nitrogen level in the two sampled groups was significantly higher than that in other sampled groups (P<0.05), and the nitrite nitrogen levels in the four sampled groups and the five sampled groups were significantly higher than those in the one sampled group and the three sampled groups respectively (P<0.05); the total nitrogen level in the two sampled groups was significantly higher than that in the four sampled groups and the five sampled groups (P<0.05), the total nitrogen level in the four sampled groups was significantly lower than that in the one sampled group (P<0.05), and there was no significant difference in the total nitrogen levels between the three sampled groups and the five sampled groups (P>0.05); the total phosphorus level in the two sampled groups was significantly higher than that in other sampled groups (P<0.05), the total nitrogen in the four sampled groups was significantly higher than that in the one sampled group (P<0.05), and there was no significant difference in the total nitrogen between the three sampled groups and the five sampled groups (P>0.05); there was no significant difference in the chemical oxygen demand of each group (P>0.05); the suspended solid level in the four sampled groups was significantly higher than that in the one sampled group (P<0.05), and there was no significant difference in the suspended solid levels between the three sampled groups and the five sampled groups (P>0.05).

[0055] The results of the first water quality test in the fourth week (D-1) showed that the total ammonia nitrogen level in the two sampled groups was significantly higher than that in the four sampled groups and the five sampled groups (P<0.05), and the total ammonia nitrogen levels in the four sampled groups and the five sampled groups were significantly lower than those in the one sampled group and the three sampled groups respectively (P<0.05); the nitrite nitrogen level in the two sampled groups was significantly higher than that in other sampled groups (P<0.05), and the nitrite nitrogen levels in the four sampled groups and the five sampled groups were significantly lower than those in the one sampled group and the three sampled groups respectively (P<0.05).

[0056] The results of the second water quality test in the fourth week (D-2) showed that the total ammonia nitrogen and nitrite nitrogen levels in the two sampled groups were significantly higher than those in other sampled groups (P<0.05), and there was no significant difference between the remaining groups (P>0.05); the total nitrogen and total phosphorus levels in the two sampled groups were significantly higher than those in other sampled groups (P<0.05), the total nitrogen levels in the four sampled groups and the five sampled groups were significantly higher than those in the one sampled group and the three sampled groups respectively (P<0.05), there was no significant difference in the total phosphorus levels between the four sampled groups and the one sampled group (P>0.05), and the total phosphorus level in the five sampled groups was significantly higher than that in the three sampled groups (P<0.05); the chemical oxygen demand in the two sampled groups was significantly higher than that in the one sampled group and the three sampled groups (P<0.05), there was no significant difference in the chemical oxygen demand between the four sampled groups and the one sampled group (P>0.05), and the chemical oxygen demand in the five sampled groups was significantly higher than that in the three sampled groups (P<0.05); the suspended solids in the two sampled groups were significantly lower than those in the one, four and five sampled groups (P<0.05), there was no significant difference in the suspended solids between the four sampled groups and the one sampled group (P>0.05), and the suspended solids in the five sampled groups were significantly higher than those in the three sampled groups (P>0.05).

[0057] The water quality test results in the fifth and sixth weeks are asFigure 5 as shown (where the temperature unit is °C, the dissolved oxygen unit is mg / L, the total ammonia nitrogen unit is mg / L, the nitrite nitrogen unit is mg / L, the total nitrogen unit is mg / L, the total phosphorus unit is mg / L, the chemical oxygen demand unit is mg / L, and the suspended solid unit is mg / L):

[0058] The results of the first water quality test in the fifth week showed (E-1) that the total ammonia nitrogen and nitrite nitrogen levels in the two sampled groups were significantly higher than those in other sampled groups (P < 0.05). The total ammonia nitrogen levels in the sampled groups 4 and 5 were significantly lower than those in the sampled groups 1 and 3 respectively (P < 0.05). There was no significant difference in the nitrite nitrogen levels between the sampled group 3 and the sampled group 5 (P > 0.05), and the nitrite nitrogen level in the sampled group 4 was significantly lower than that in the sampled group 1 (P < 0.05).

[0059] The results of the second water quality test in the fifth week showed (E-2) that the total ammonia nitrogen level in the sampled group 2 was significantly higher than those in the sampled groups 4 and 5 (P < 0.05), and the total ammonia nitrogen levels in the sampled groups 4 and 5 were significantly lower than those in the sampled groups 1 and 3 respectively (P < 0.05); the nitrite nitrogen level in the sampled group 2 was significantly higher than those in other sampled groups (P < 0.05), and there was no significant difference among the other groups (P > 0.05); the total nitrogen level in the sampled group 2 was significantly higher than those in other sampled groups (P < 0.05), and there was no significant difference in the total nitrogen levels between the sampled group 1 and the sampled group 4, and between the sampled group 3 and the sampled group 5 (P > 0.05); the total phosphorus and chemical oxygen demand levels in the sampled group 2 were significantly higher than those in other sampled groups (P < 0.05), the suspended solids in the sampled group 2 were significantly higher than those in the sampled groups 1, 3, and 5 (P < 0.05), and the chemical oxygen demand and suspended solids in the sampled groups 4 and 5 were significantly higher than those in the sampled group 1 and the sampled group 3 respectively (P < 0.05).

[0060] The results of the first water quality test in the sixth week showed (F-1) that the total ammonia nitrogen level in the sampled group 2 was significantly higher than those in other sampled groups (P < 0.05), and the total ammonia nitrogen levels in the sampled groups 4 and 5 were significantly lower than those in the sampled group 1 and the sampled group 3 respectively (P < 0.05); the nitrite nitrogen level in the sampled group 2 was significantly higher than that in the sampled group 3 (P < 0.05), and there was no significant difference in the nitrite nitrogen levels between the sampled group 4 and the sampled group 1, and between the sampled group 5 and the sampled group 3 (P > 0.05).

[0061] The results of the second water quality test in the sixth week (F-2) showed that the levels of total ammonia nitrogen, nitrite nitrogen, and total phosphorus in the two sampling groups were significantly higher than those in other sampling groups (P < 0.05). The levels of total ammonia nitrogen, nitrite nitrogen, and total phosphorus in sampling groups 4 and 5 were significantly higher than those in sampling group 1 and sampling group 3 respectively (P < 0.05). The total nitrogen level in sampling group 2 was significantly higher than that in sampling group 3 (P > 0.05), and there was no significant difference among the other groups (P > 0.05). The chemical oxygen demand level in sampling group 2 was significantly higher than that in other sampling groups (P < 0.05), and there was no significant difference among the other groups (P > 0.05). The suspended solids in sampling group 2 were significantly higher than those in sampling groups 1, 3, and 5 (P < 0.05), the suspended solids in sampling group 4 were significantly higher than those in sampling group 1 (P < 0.05), and there was no significant difference between sampling group 3 and sampling group 5 (P > 0.05). In summary, based on the water quality test results in this embodiment, the paddy field has a certain purification effect on the aquaculture tail water.

[0062] This specific embodiment is only an interpretation of the present invention and is not a limitation thereof. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A method for evaluating the effect of treating tailwater of a land-based aquaculture system in a rice field, characterized by: The following steps are involved: S1. Set up a land-based aquaculture system test model under rice-fish integrated farming mode; S2. Repeated sampling of rice field water, aquaculture tailwater and influent of land-based aquaculture systems according to predetermined locations; S3. Test water quality twice a week. Test parameters include pH, temperature, dissolved oxygen, total ammonia nitrogen, nitrite nitrogen, total nitrogen, total phosphorus, chemical oxygen demand and suspended solids. S4. During the experiment, fertilizers were applied to the rice fields in the third and fourth weeks, with compound fertilizers and urea used in the third week and water-soluble fertilizers used in the fourth week. S5. According to the growth stage of rice, record the data of tillering stage, jointing and booting stage, heading stage and flowering stage respectively; S6. Conduct statistical analysis on the test results and compare the differences in water quality parameters between different sampling groups to evaluate the treatment effect of rice fields on aquaculture tail water.

2. The method for evaluating the effect of treating tailwater of a land-based aquaculture system in a rice field according to claim 1, characterized in that: The land-based aquaculture system test model in step S1 includes 15 aquaculture barrels, 6 of which are stocked with hybrid snakeheads with an average weight range of 240-261 g, with 25 fish in each barrel, and the other 9 barrels are stocked with hybrid snakeheads with an average weight range of 136-141 g, with 25 fish in each barrel. During the aquaculture process, the fish are fed 1-2 times per day in apparent satiation.

3. The method for evaluating the effect of treating tailwater of a land-based aquaculture system in a rice field according to claim 1, characterized in that: The process of repeated sampling in step S2 is as follows: before discharging aquaculture tail water, water samples are taken from the rice field at predetermined locations, and after mixing, they are recorded as sampling 1, which is repeated 3 times; when discharging aquaculture tail water, water samples are collected from the outlet as sampling 2, and water samples are collected from the water inlet as sampling 3, which are repeated 3 times respectively; before discharging aquaculture tail water on the second day, water samples are taken from the rice field again as sampling 4, which is repeated 3 times, and water samples are collected from the water inlet as sampling 5, which is repeated 3 times.

4. The method for evaluating the effect of treating tailwater of a land-based aquaculture system in a rice field according to claim 1, characterized in that: The water quality in step S3 is detected by using a fully automatic water quality detection device to detect pH, temperature, dissolved oxygen, total ammonia nitrogen and nitrite nitrogen, and using a portable multi-parameter water quality meter to detect total nitrogen, total phosphorus, chemical oxygen demand and suspended solids.

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