CN113344397A - Facility agriculture underground brackish water and rainwater mixed irrigation method - Google Patents
Facility agriculture underground brackish water and rainwater mixed irrigation method Download PDFInfo
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Abstract
The invention discloses a facility agriculture underground brackish water and rainwater mixed irrigation method, which comprises the following steps: determining the optimal conductivity of irrigation water required by facility crops; measuring the actual conductivity of the underground brackish water; calculating the mixing ratio of the underground brackish water and the rainwater according to the dilution ratio function; mixing the underground brackish water and rainwater according to the calculated mixing ratio to obtain irrigation water; irrigating the facility crop with the mixed irrigation water. By utilizing the irrigation method, irrigation water with determined conductivity can be quickly mixed to irrigate facility crops, and support is provided for efficient and safe irrigation of brackish water.
Description
Technical Field
The invention belongs to the technical field of agricultural irrigation, and particularly relates to a facility agricultural underground brackish water and rainwater mixed irrigation method.
Background
Agricultural water is a large portion of the water resource, with crop production water accounting for approximately 30% of the agricultural water. With the exhaustion of water resources and the increasing problem of water quality deterioration, the shortage of fresh water resources has become a major factor limiting the development of agriculture. The rain collection and supplementary irrigation is one of the ways to solve the problem of agricultural water resource shortage. However, natural rainfall is rich and poor, and alternation is uneven, so that annual variation is large, and rain collection irrigation is difficult to meet the agricultural production requirements.
In recent years, with the shortage of fresh water resources, the utilization of brackish water is receiving more and more attention from people. The earth has abundant brackish water resources, most of the brackish water resources are located 10-100 m underground and easy to extract, so that the development and utilization of the brackish water resources have important significance for relieving water resource contradiction, saving fresh water resources, expanding agricultural water sources and the like, and underground brackish water irrigation becomes one of effective ways for solving the problem of water resource shortage. However, the salt content of the brackish water is generally high, the brackish water is directly used for irrigation, the salt content in the soil can be increased while the soil moisture is increased, unreasonable brackish water is used for irrigation, the soil quality is reduced, the seedling emergence and growth of crops are not facilitated, and the crop yield reduction is caused. Thus, selecting an appropriate brackish water salt concentration (characterized by conductivity) to avoid salt stress on plants from the salt content is a key to rational use of brackish water irrigation. In the prior art, underground brackish water and fresh water or rainwater are subjected to rotational irrigation, on one hand, when brackish water with higher salt content is used for irrigation in the rotational irrigation process, adverse effects can still be generated on facility crops in the growth period, and even if the adverse effects on the brackish water are partially relieved in the rotational irrigation process of using the fresh water or the rainwater, the adverse effects caused by the brackish water irrigation cannot be completely eliminated, and certain effects can also be generated on the final yield of the crops. On the other hand, brackish water and fresh water or rainwater are used for irrigation in a wheel mode, which easily causes poor irrigation uniformity and inconsistent influence of salinity in irrigation water on crops. Therefore, it is of great significance to find an efficient and feasible irrigation method capable of accurately controlling the salinity (conductivity) of the irrigation water.
Disclosure of Invention
In order to solve the problems in the prior art and achieve the purposes of accurately controlling the salt content (conductivity) of irrigation water and realizing high efficiency and feasibility when facility crops are irrigated, the invention provides a method for measuring the actual conductivity of underground brackish water and the optimal conductivity of water required by irrigation, further calculating the mixing ratio of the underground brackish water and rainwater through a dilution ratio function, and mixing the underground brackish water and rainwater according to the mixing ratio to obtain the irrigation water for irrigating the crops.
In order to achieve the purpose, the invention provides the following scheme:
a facility agriculture underground brackish water and rainwater mixed irrigation method comprises the following steps: the method comprises the steps of firstly determining the optimal conductivity of irrigation water required by facility crops, then measuring the actual conductivity of the underground brackish water, then calculating the mixing ratio of the underground brackish water and rainwater according to a dilution ratio function, finally mixing the underground brackish water and the rainwater according to the calculated mixing ratio to obtain irrigation water, and irrigating the facility crops by using the mixed irrigation water.
Further, the step of determining the optimum conductivity of the irrigation water required for the facility crop comprises: the method is characterized in that the conductivity of irrigation water is used as a unique variable to carry out variable tests on facility crops, water with different conductivities is selected to irrigate the facility crops, and the optimal conductivity of the required irrigation water is determined according to the growth condition, the yield or the quality of the facility crops.
Further, brackish water and rain water are calculated according to dilution proportioning functionThe concrete steps of the mixing ratio are as follows: substituting the actual conductivity value of the underground brackish water into the proportioning function, and calculating to obtain a proportioning value ya(ii) a Substituting the optimal conductivity value of the required irrigation water into the proportioning function, and calculating to obtain the proportioning value yb(ii) a The mixing proportion of the underground brackish water and the rainwater is VBrackish water underground:VRain water＝(1+ya):(yb-ya) The specific flow chart of the calculation steps is shown in fig. 1.
Further, when the actual conductivity of the underground brackish water or the optimal conductivity of the irrigation water required by the facility crops is 11.0mS/cm, x is more than or equal to 5mS/cm, the proportioning function is y1＝－0.0049x3+0.1532x2－1.7192x+6.9048R2＝0.9997。
Further, the actual conductivity of the local brackish water or the optimum conductivity of the irrigation water required for the facility crops is 5mS/cm>When x is more than or equal to 3mS/cm, the proportioning function is y2＝－0.089x3+1.3856x2－7.8365x+17.203R2＝1。
Further, the actual conductivity of the local brackish water or the optimum conductivity of the irrigation water required for the facility crops is 3mS/cm>When x is more than or equal to 2mS/cm, the proportioning function is y3＝－1.5294x3+13.186x2－40.139x+46.792R2＝0.9997。
Further, the actual conductivity of the local brackish water or the optimum conductivity of the irrigation water required for the facility crops is 2mS/cm>When x is more than or equal to 1.5mS/cm, the proportion function is y4＝－4.749x3+31.196x2－73.371x+66.972R2＝1。
Further, the facility crop is a salinity sensitive crop.
Further, salt-sensitive crops are in particular tomatoes, cucumbers and melons.
Further, because certain errors may exist in the dilution proportioning function, the conductivity measurement process and the mixing process of the underground brackish water and the rainwater, the difference between the actual conductivity and the target conductivity of the mixed irrigation water is caused, and the errors are inevitable, the relative error between the actual conductivity and the target conductivity of the mixed irrigation water is set to be-2%, and the relative error between the actual conductivity and the target conductivity of the mixed irrigation water is in the range of-2%, so that the actual conductivity and the target conductivity of the mixed irrigation water are basically consistent, and the dilution proportioning function is accurate and effective.
The actual meaning and the determination process of the optimal conductivity of the irrigation water required by the facility crops are specifically that the conductivity of the irrigation water is set to be several gradients of 0.5-1, 1-1.5, 1.5-2, 2-2.5, 2.5-3, …, 10.5-11.0mS/cm and the like (the conductivity of rainwater is generally about 0.5mS/cm, the scheme of the invention for irrigation by using underground brackish water and rainwater is used for solving the problem that the fresh water resource is in short supply and the rainwater irrigation is difficult to meet the required dilemma by using brackish water irrigation, so the range of the conductivity of 0-0.5mS/cm has no need of tests), the end point values of each gradient are selected from 0.5mS/cm for carrying out the irrigation test on the facility crops (the conductivity of the irrigation water is a unique variable, the irrigation times, the irrigation water consumption and other management measures are the same as the conventional ones), determining an optimal conductivity range of the irrigation water suitable for the crop according to the growth condition, yield or quality of the crop when the conductivity of the irrigation water is at each end value, and taking any determined conductivity value in the conductivity range as the optimal conductivity of the irrigation water required by the facility crop.
The source and mixing proportion method of the brackish water conductivity and rainwater dilution proportion function comprises the following steps:
31 underground brackish water samples from Shaanxi province, Ningxia and other places are collected, the temperature of the brackish water liquid to be detected is kept at 25 +/-0.1 ℃, and conductivity of the collected brackish water is measured by a thunder magnetic DDS-307A conductivity meter. Taking a certain amount of brackish water with the highest conductivity, then adding different amounts of rainwater, and mixing, wherein the brackish water: the proportion of the rainwater (volume ratio) is 0, 0.05, 0.1, 0.15, 0.2, 0.25, …, 13.4, 13.45 and 13.5, the conductivity of the mixed water according to different proportions is measured by adopting a thunder magnetic DDS-307A conductivity meter, the temperature of the mixed liquid is kept at 25 +/-0.1 ℃, and the data is measured and recorded. Repeating the steps for multiple times, and averaging to obtain two groups of data, wherein one group is the mixing proportion of the brackish water and the rainwater, and the other group is the corresponding measured value of the conductivity. A regression curve was fitted to a function image with the measured conductivity value of x and the compounding ratio of y by Excel software, and a specific function image was shown in fig. 2.
And obtaining a regression equation according to the regression curve, namely obtaining the actual brackish water conductivity and the rainwater dilution proportioning function.
When the conductivity is more than or equal to 11.0mS/cm and more than or equal to x is more than or equal to 5mS/cm
Dilution ratio function 1: y is1＝－0.0049x3+0.1532x2－1.7192x+6.9048
R2＝0.9997
When the conductivity is more than 5mS/cm and x is more than or equal to 3mS/cm
Dilution ratio function 2: y is2＝－0.089x3+1.3856x2－7.8365x+17.203
R2＝1
When the conductivity is more than 3mS/cm and x is more than or equal to 2mS/cm
Dilution ratio function 3: y is3＝－1.5294x3+13.186x2－40.139x+46.792
R2＝0.9997
When the conductivity is more than 2mS/cm and x is more than or equal to 1.5mS/cm
Dilution ratio function 4: y is4＝－4.749x3+31.196x2－73.371x+66.972
R2＝1
The actual conductivity of the underground brackish water and the optimal conductivity of irrigation water required by facility crops are measured, and the dilution proportioning function is utilized to further calculate the mixing proportion of the underground brackish water and rainwater, so that support is provided for efficient and safe irrigation of the underground brackish water.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention establishes the functions of brackish water conductivity and rainwater dilution ratio by measuring the conductivity of underground brackish water and rainwater after mixing according to different proportions. The optimal conductivity of irrigation water required by facility crops is determined, the actual conductivity of the underground brackish water is measured, the mixing proportion of the underground brackish water and the rainwater is calculated by using a dilution proportioning function, the irrigation water with the determined conductivity can be quickly mixed according to the mixing proportion, and support is provided for efficient and safe irrigation of the brackish water.
(2) The conductivity of the underground brackish water is generally higher, the underground brackish water is directly utilized for irrigation, so that the soil moisture is increased, meanwhile, the salinity in the soil is also increased, the unreasonable use of the underground brackish water for irrigation can cause the soil quality to be reduced, the seedling emergence and the growth of crops are not facilitated, and the yield reduction of the crops is caused. According to the invention, the underground brackish water and the rainwater are mixed through the dilution proportioning function to obtain irrigation water with controllable conductivity, and the brackish water diluted by the rainwater with lower conductivity is reasonably used for irrigation, so that the crop is not obviously reduced in yield, and even the yield is improved to a certain extent. The facility for irrigating the tomatoes by mixing the brackish water and the rainwater can improve the hardness, color and sweetness of the tomato fruits, and the sugar content of the tomato fruits is obviously higher than that of the tomato fruits by fresh water irrigation, because the sugar content in tomato leaves and fruits can be increased by reasonable-concentration brackish water irrigation, and the activity of sucrose transport protein and invertase is enhanced, so that the sugar content of the tomato fruits is improved; the brackish water with reasonable concentration is used for irrigating crops sensitive to salt, such as cucumbers, melons and the like, so that the utilization efficiency of the irrigation water of the cucumbers and the quality of the melons can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of the steps for calculating compounding ratios using dilution ratio functions.
FIG. 2 is a functional image of a fitted regression curve at a conductivity of 11.0mS/cm ≧ x ≧ 5 mS/cm.
FIG. 3 is a functional image of a fitted regression curve at a conductivity of 5mS/cm > x ≧ 3 mS/cm.
FIG. 4 is a functional image of a fitted regression curve at a conductivity of 3mS/cm > x ≧ 2 mS/cm.
FIG. 5 is a functional image of a fitted regression curve at a conductivity of 2mS/cm > x ≧ 1.5 mS/cm.
Figure 6 shows tomato growth at different irrigation water conductivity facilities.
FIG. 7 shows the growth of vegetables in different irrigation water conductivity facilities.
FIG. 8 shows the growth of spinach in different irrigation water conductivity facilities.
FIG. 9 shows the growth of garlic sprouts in different irrigation water conductivity facilities.
Fig. 10 shows the growth of cucumbers in different irrigation water conductivity facilities.
Fig. 11 shows the growth of peppers in different irrigation water conductivity facilities.
FIG. 12 is a graph showing the effect of different irrigation water conductivity on plant height of facility tomatoes.
Figure 13 is a graph of the effect of different irrigation water conductivity on tomato stem thickness in a facility.
FIG. 14 is a graph of the effect of different irrigation water conductivity on facility tomato yield per plant.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but as a more detailed description of certain aspects, features and embodiments of the invention. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including, but not limited to.
Example 1
The influence of the conductivity of the irrigation water on the growth condition of the facility crops is verified:
selecting water with the conductivity of 1.56mS/cm, 4.69mS/cm and 9.67mS/cm to irrigate facility tomatoes, facility vegetables, facility spinach and facility garlic sprouts respectively, irrigating the facility cucumbers and facility peppers with water with the conductivity of 0.65mS/cm, 3.34mS/cm and 9.67mS/cm respectively, taking the conductivity of irrigation water as a unique variable, and adopting the irrigation frequency, the irrigation water consumption and other field management measures as conventional, observing the growth conditions of facility crops irrigated with water with different conductivities, respectively showing the growth conditions of facility tomatoes, facility vegetables, facility spinach and facility garlic sprouts with different irrigation water conductivities as shown in figures 6-9, respectively showing the growth conditions of facility cucumbers and facility peppers with different irrigation water conductivities as shown in figures 10 and 11, and measuring the plant height, stem thickness and single plant yield of the tomatoes when the tomatoes are ripe, the effect of different irrigation water conductivities on facility tomato plant height, stem thickness and individual plant yield is shown in figures 12, 13 and 14, respectively. From fig. 6-fig. 14, it is evident that the facility crops irrigated with water of different conductivity have different growth conditions and different fruit or vegetable yields, and the facility crops irrigated with water of too high conductivity (too high salt content) is obviously not beneficial to the growth of the facility crops and affects the yield of the crops, wherein the facility spinach and the facility garlic sprout can not grow at all when irrigated with water of 9.67mS/cm conductivity, which indicates that the conductivity (salt content) of the irrigation water can indeed affect the growth conditions and yield of the crops, and the facility crops can not be directly irrigated with brackish water of higher salt content in actual production.
Example 2
Facility tomatoes are selected as irrigation objects, and underground brackish water of Dali von village is used as underground brackish water for dilution.
(1) Determining the optimum conductivity of irrigation water required for a facility tomato
The test results in example 1 have demonstrated that the growth and yield per plant of facility tomatoes with an irrigation water conductivity in the range of 1.56mS/cm to 4.69mS/cm is significantly better than when the conductivity is in the range of 4.69mS/cm to 9.67mS/cm, so that the conductivity range of 4.69mS/cm to 9.67mS/cm need not be considered again in determining the optimum conductivity of the irrigation water required for the facility tomatoes. Selecting water with the conductivity of 0.5mS/cm, 1.0mS/cm, 1.5mS/cm, 2.0mS/cm, 2.5mS/cm, 3.0mS/cm, 3.5mS/cm, 4.0mS/cm and 4.5mS/cm to irrigate the facility tomatoes respectively, and the irrigation frequency, the irrigation water consumption and other field management measures are the same as the conventional measures. The growth of the tomato plants is monitored during the tomato growth cycle, and the individual plant yield of the facility tomatoes is determined as the tomatoes mature. The optimum conductivity range of the irrigation water required for the tomatoes was determined from the growth of the tomato plants and the individual yield (averaged over multiple measurements) to be in the range of 2.5mS/cm to 3.0mS/cm, and 2.75mS/cm was selected as the optimum conductivity for the irrigation water required for the tomatoes in the facility.
(2) Determining actual conductivity of underground brackish water in test area
The actual conductivity of the underground brackish water was measured at great litchi village to be 8.64 mS/cm.
(3) Calculating the blending ratio according to the dilution ratio function
Substituting the actual conductivity of the underground brackish water into dilute waterCalculating a ratio value y by releasing the ratio function 1aSubstituting the optimal conductivity of the irrigation water required by the tomatoes obtained in the step (1) to be 2.75mS/cm into a dilution proportioning function 3 to calculate yb4.322. The mixing proportion of the underground brackish water and the rainwater is VBrackish water underground:VRain water＝(1+ya):(yb-ya)＝(1+0.33):(4.322-0.33)＝0.33:1。
(4) Mixing the brackish water and rainwater according to the calculated mixing proportion to obtain irrigation water
Mixing underground brackish water with the conductivity of 8.64mS/cm and rainwater according to the volume ratio of 0.331:1 to obtain irrigation water required by tomato plants with the conductivity of about 2.75mS/cm, keeping the temperature of the irrigation water obtained by mixing at 25 +/-0.1 ℃, and actually measuring the conductivity of the irrigation water obtained by mixing by using a conductivity meter to be 2.73mS/cm, wherein the conductivity is basically consistent with the target conductivity.
(5) And irrigating the facility tomatoes by using the mixed irrigation water according to the conventional field management measures of the tomatoes.
Example 3
Facility cucumbers are selected as irrigation objects, and underground brackish water in a Xian Tong area is used as underground brackish water for dilution.
(1) Determining optimal conductivity of irrigation water required for cucumber plants
The optimum conductivity of the irrigation water required for cucumber was determined to be 1.85mS/cm in the same manner as in step (1) of example 2.
(2) Determining actual conductivity of underground brackish water in test area
The actual conductivity of the underground brackish water measured in the Xian Tong area is 4.38 mS/cm.
(3) Calculating the blending ratio according to the dilution ratio function
Substituting the actual conductivity of the underground brackish water into a dilution proportioning function 2 to calculate a proportioning value yaSubstituting the optimal conductivity of the irrigation water required by the cucumbers obtained in the step (1) to 1.85mS/cm into a dilution ratio function 4 to calculate yb7.936. The mixing ratio of the rainwater to the underground brackish water is VBrackish water underground:VRain water＝(1+ya):(yb-ya)＝(1+1.983):(7.936-1.983)＝0.501:1。
(4) Mixing the brackish water and rainwater according to the calculated mixing proportion to obtain irrigation water
Mixing underground brackish water with the conductivity of 4.38mS/cm and rainwater according to the volume ratio of 0.501:1 to obtain irrigation water required by tomato plants with the conductivity of about 1.85mS/cm, keeping the temperature of the irrigation water obtained by mixing at 25 +/-0.1 ℃, and actually measuring the actual conductivity of the irrigation water obtained by mixing by using a conductivity meter to be 1.86mS/cm and basically consistent with the target conductivity.
(5) And irrigating the facility crops by using the mixed irrigation water according to the conventional field management measures of the cucumbers.
Example 4
Selecting underground brackish water of Dali Von village with the conductivity of 8.64mS/cm as underground brackish water for mixing, setting a target conductivity, calculating a mixing proportion according to the target conductivity through a dilution proportion function, mixing according to the mixing proportion to obtain irrigation water, actually measuring the conductivity of the irrigation water obtained by mixing (the measurement conditions of the underground brackish water and the irrigation water obtained by mixing are consistent, and the measured temperature conditions are all 25 +/-0.1 ℃), and comparing the measured conductivity with the target conductivity, wherein the results are shown in Table 1:
TABLE 1
Example 5
Selecting underground brackish water of a west safety Tong area with the conductivity of 4.48mS/cm as underground brackish water for mixing, setting a target conductivity, calculating a mixing proportion according to the target conductivity through a dilution proportioning function, mixing according to the mixing proportion to obtain irrigation water, actually measuring the conductivity of the irrigation water obtained by mixing (the measurement conditions of the underground brackish water and the irrigation water obtained by mixing are consistent, and the measured temperature conditions are all 25 +/-0.1 ℃), and comparing the measured conductivity with the target conductivity, wherein the results are shown in table 2:
TABLE 2
| Target conductivity/(mS/cm) | Measured conductivity/(mS/cm) | Target conductivity/(mS/cm) | Measured conductivity/(mS/cm) |
| 1.50 | 1.51 | 3.00 | 3.02 |
| 1.80 | 1.79 | 3.50 | 3.51 |
| 2.00 | 2.03 | 4.00 | 4.02 |
| 2.50 | 2.48 | 4.20 | 4.21 |
As can be seen from the data in tables 1 and 2, the actual conductivity of the irrigation water mixed according to the mixing ratio calculated by the mixing function is substantially consistent with the target conductivity, which indicates that the method for calculating the mixing ratio by the dilution ratio function and further mixing irrigation water with a certain target conductivity provided by the invention has accuracy, effectiveness, universality and practicability.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A facility agriculture underground brackish water and rainwater mixed irrigation method is characterized by comprising the following steps:
determining the optimal conductivity of irrigation water required by facility crops;
measuring the actual conductivity of the underground brackish water;
calculating the mixing ratio of the underground brackish water and the rainwater according to the dilution ratio function;
mixing the underground brackish water and the rainwater according to the calculated mixing ratio to obtain irrigation water;
irrigating the facility crop with the mixed irrigation water.
2. The facility agricultural mixed groundwater and rainwater irrigation method as claimed in claim 1, wherein the specific step of determining the optimal conductivity of the irrigation water required for the facility crop comprises: the method is characterized in that the conductivity of irrigation water is used as a unique variable to carry out variable tests on facility crops, water with different conductivities is selected to irrigate the facility crops, and the optimal conductivity of the required irrigation water is determined according to the growth condition, the yield or the quality of the facility crops.
3. The facility agricultural underground brackish and rain water of claim 1The mixed irrigation method is characterized in that the concrete steps of calculating the mixing ratio of the underground brackish water and the rainwater according to the dilution ratio function are as follows: substituting the actual conductivity value of the underground brackish water into the proportioning function, and calculating to obtain a proportioning value ya(ii) a Substituting the optimal conductivity value of the required irrigation water into the proportioning function, and calculating to obtain the proportioning value yb(ii) a The mixing proportion of the underground brackish water and the rainwater is VBrackish water underground:VRain water＝(1+ya):(yb-ya)。
4. The facility agricultural mixed irrigation method of underground brackish water and rainwater according to claim 3, wherein the proportioning function is y when the actual conductivity of underground brackish water or the optimum conductivity of irrigation water required for facility crops is 11.0mS/cm ≧ x ≧ 5mS/cm1＝－0.0049x3+0.1532x2－1.7192x+6.9048R2＝0.9997。
5. The facility agricultural mixed groundwater irrigation method of claim 3, wherein the actual conductivity of the local brackish water or the optimal conductivity of the irrigation water required for the facility crop is 5mS/cm>When x is more than or equal to 3mS/cm, the proportioning function is y2＝－0.089x3+1.3856x2－7.8365x+17.203R2＝1。
6. The facility agricultural mixed groundwater irrigation method of claim 3, wherein the actual conductivity of the local brackish water or the optimal conductivity of the irrigation water required for the facility crop is 3mS/cm>When x is more than or equal to 2mS/cm, the proportioning function is y3＝－1.5294x3+13.186x2－40.139x+46.792R2＝0.9997。
7. The facility agricultural mixed groundwater irrigation method of claim 3, wherein the actual conductivity of the local brackish water or the optimal conductivity of the irrigation water required for the facility crop is 2mS/cm>When x is more than or equal to 1.5mS/cm, the proportion function is y4＝－4.749x3+31.196x2－73.371x+66.972R2＝1。
8. The facility agricultural mixed groundwater and rainwater irrigation method as claimed in claim 1, wherein the facility crop is a salinity-sensitive crop.
9. The facility agricultural mixed groundwater and rainwater irrigation method as claimed in claim 8, wherein the salt-sensitive crop is specifically tomato, cucumber or melon.
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