Method and device for accurately obtaining water demand of cut chrysanthemum

Abstract

The invention discloses a method and a device for accurately acquiring water demand of cut-flower chrysanthemum. The method comprises the following steps: calculating a daily crop coefficient of the cut-flower chrysanthemum after field planting according to a field planting date and a formula; acquiring the anti-interference evaporation capacity Epan, namely acquiring the water level height Ht of an inner cylinder of the evaporator according to a set frequency, detecting a water splashing event and an evaporator water replenishing event in real time by adopting a dynamic threshold method, and finally outputting the evaporation capacity Epan according to the water level difference value in a continuous time period and the water level net increment of the water splashing event and the water replenishing event; calculating the evapotranspiration ETc of the cut-flower chrysanthemum in unit area: calculating the evapotranspiration of the cut-flower chrysanthemum according to a formula ETc = Kc * Epan; according to the field planting area A and the formula Q = (ETc-sigma delta Hsplah) * A, the water demand Q of the cut-flower chrysanthemum in the area is calculated, and sigma delta Hsplah is the sum of net increment of water splashing events in adjacent fixed time. According to the invention, based on the time-driven cut-flower chrysanthemum crop coefficient Kc model, the accurate dynamic management of moisture in the whole growth period of cut-flower chrysanthemum is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a method and device for obtaining the water requirement of cut chrysanthemum, and in particular to a method and device for accurately obtaining the water requirement of cut chrysanthemum. BACKGROUND

[0002] As an important economic flower, the growth of cut chrysanthemum is extremely sensitive to water demand, and excessive or insufficient irrigation will lead to quality decline and yield reduction. Therefore, accurate simulation of the water requirement (ETc) of cut chrysanthemum is an important prerequisite for efficient irrigation.

[0003] Currently, the crop water requirement (ETc) is generally calculated using the reference crop evapotranspiration (ET0) recommended by FAO-56 and the crop coefficient (Kc) model (ETc = Kc x ET0), but this model has significant limitations in the practical application of cut chrysanthemum production: on the one hand, ET0 calculation relies on multiple sources of meteorological data such as temperature, humidity, wind speed, solar radiation, etc., which requires the deployment of an expensive weather station with a cost exceeding 20,000 yuan, making it difficult to promote in small and medium-sized greenhouses; on the other hand, the existing Kc values are mostly fixed empirical values recommended by FAO-56, which are suitable for field crops, and often cover the entire growth period with a single fixed value, making it difficult to accurately reflect the actual water demand characteristics of cut chrysanthemum at different growth stages.

[0004] Existing evaporation measurement techniques have low interference resistance, for example, the float-type evaporation measurement device used in patent CN201921234567.X has a mechanical structure that is sensitive to environmental interference, and the measurement accuracy is insufficient; other technical solutions are prone to data distortion when liquid interference events such as pesticide spraying, sprinkling irrigation, rainfall, or evaporator water replenishment occur in the production field.

[0005] In view of the above problems, it is urgent to develop a cut chrysanthemum water requirement simulation method and device based on dynamic Kc matching and weighing-type evaporation monitoring, to realize accurate, real-time, and low-cost calculation of ETc, and to fill the technical transformation gap from environmental evaporation to crop water requirement. SUMMARY

[0006] The purpose of the present application is to provide a method and device for accurately obtaining the water requirement of cut chrysanthemum, which realizes accurate prediction of the water requirement of cut chrysanthemum through dynamic matching of the crop coefficient Kc specific to cut chrysanthemum and weighing-type evaporation monitoring, and provides localized decision support for greenhouse precision irrigation.

[0007] Technical solution: the present application comprises the following steps:

[0008] S1. Obtain the adaptive crop coefficient Kc of cut chrysanthemum: calculate the daily crop coefficient of cut chrysanthemum after planting according to the planting date and formula , where x is the number of days after planting, a, k, and x0 are empirical parameters related to the crop;

[0009] S2. Anti-interference evaporation amount Epan acquisition: collecting the water level height H of the evaporator inner cylinder at a set frequency t , using a dynamic threshold method to detect water splash-in events and evaporator water replenishment events in real time, according to the water level difference in a continuous time period, superimposing the water level net increment of the splash-in event and the water replenishment event, and finally outputting the evaporation amount Epan;

[0010] S3. Calculation of unit area cut flower chrysanthemum evapotranspiration ETc: calculating the evapotranspiration of cut flower chrysanthemum according to the formula ETc=Kc×Epan;

[0011] S4. Calculation of regional area cut flower chrysanthemum water requirement Q: calculating the regional area cut flower chrysanthemum water requirement according to the planting area A and the formula Q=(ETc-∑ΔH splash )×A, ∑ΔH splash is the net increment sum of splash-in events in adjacent fixed time.

[0012] The anti-interference evaporation amount Epan acquisition specifically includes the following steps:

[0013] S21, collecting the water level height H of the evaporator inner cylinder by a weight sensor at a set frequency t ;

[0014] S22, calculating the water level change rate

[0015] S23, event detection and classification: if 0<ΔH rate ≤δ splash , δ splash ∈[3,10]mm / min, it is marked as a splash-in event; if δ refill <ΔH rate ≤200, δ refill ∈[50,150]mm / min, it is marked as an evaporator water replenishment event;

[0016] S24, daily evaporation amount calculation.

[0017] The daily evaporation amount calculation specifically includes:

[0018] Recording the reference water level H at a fixed time T ref every day ref,day ;

[0019] Calculating the net increment sum ∑ΔH splash of splash-in events in adjacent fixed time, and the net increment sum ∑ΔH refill of evaporator water replenishment events;

[0020] Daily evapotranspiration Epan=(H ref,day-1 -H ref,day )+∑ΔHsplash +∑ΔH refill .

[0021] The formula for calculating the net increase sum of the splash water event in the adjacent fixed time is:

[0022] ∑ΔH splash =∑ t∈溅水事件 (H start -H end )

[0023] The change of water level caused by evaporation during the event is not corrected.

[0024] The splash water event includes spraying, sprinkling irrigation, humidification and rainfall.

[0025] The formula for calculating the net increase sum of the evaporation device water replenishment event is:

[0026] ∑ΔH refill =∑ t∈补水事件 (H start -H end )。

[0027] The parameters a, k and x0 adapted to cut chrysanthemum are that the value of a is 4.56-4.65, the value of k is 0.091-0.099, and the value of x0 is 15.41-16.29.

[0028] The parameters adapted to cut chrysanthemum are calibrated through multiple batches of field tests.

[0029] A device for accurately obtaining the water requirement of cut chrysanthemum includes a weighing unit and a control unit, the weighing unit includes an evaporator, the bottom of the evaporator is provided with an upper support and a lower support, and a weight sensor is fixed between the upper support and the lower support; the control unit includes a case, and the case is connected with the weight sensor.

[0030] The evaporator includes an outer cylinder and an inner cylinder, the outer cylinder is fixed above the upper support, and the inner cylinder is coaxially nested in the inner part of the outer cylinder.

[0031] Advantages: the present application has the following advantages:

[0032] 1. The model based on time driving of crop coefficient Kc of cut chrysanthemum is created, the industry pain point that the general crop coefficient cannot accurately reflect the stage water requirement law of cut chrysanthemum is solved, and the water accurate dynamic management of cut chrysanthemum in the whole growth period is significantly improved.

[0033] 2. The evaporator effectively blocks rainwater splashing, wind disturbance and solar radiation heat effect through the double-cylinder nesting design, and ensures the accuracy of evaporation data.

[0034] 3. Through high-frequency weight collection and dynamic threshold algorithm processing, the interference of splashing water events and water supplement events on the accuracy of evaporation amount is effectively solved, and the accuracy of data is significantly improved;

[0035] 4. Through the localization of RS485 industrial control screen, the evaporation amount collection, Kc matching, ETc calculation, data storage and query closed loop are completed, the decision efficiency is multiplied, and the decision of the front-line managers is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a device structure schematic view of the present application;

[0037] Figure 2 It is a case internal structure schematic view of the present application;

[0038] Figure 3 It is an ETc dynamic change curve graph of cut chrysanthemum from the vegetative growth period to the flower bud differentiation period;

[0039] Figure 4 It is an Epan dynamic change curve graph of cut chrysanthemum from the vegetative growth period to the flower bud differentiation period;

[0040] Figure 5 It is an ETc and Epan dynamic change curve graph of cut chrysanthemum from the flower bud swelling period to the picking period;

[0041] Figure 6 It is a relationship curve graph between the leaf area index LAI and Kc of Nannong Xiaojinxing in the whole growth period;

[0042] Figure 7 It is a mixed data between the leaf area index LAI and Kc of Nannong Xiaojinxing, Ruiduostbai and Nannong Danxin in the whole growth period;

[0043] Figure 8 It is a relationship graph between the days after planting and the crop coefficient Kc of cut chrysanthemum. DETAILED DESCRIPTION

[0044] The present application will be further described below in combination with the drawings.

[0045] Example 1

[0046] The method for accurately obtaining the water requirement of cut chrysanthemum of the present embodiment comprises the following steps:

[0047] S1. Obtaining the adaptive crop coefficient Kc of cut chrysanthemum: according to the planting date and the formula The daily crop coefficient of cut chrysanthemum after planting is calculated, wherein x is the number of days after planting, a, k and x0 are experience parameters related to the crop; the parameters a, k and x0 adapted to the cut chrysanthemum are as follows: the value of a is 4.56-4.65, the value of k is 0.091-0.099, and the value of x0 is 15.41-16.29. The parameters adapted to the cut chrysanthemum are calibrated through multiple batches of field tests.

[0048] S2. Anti-interference evaporation amount Epan acquisition: collecting the water level height H of the inner cylinder of the evaporator at a set frequency t , using a dynamic threshold method to detect water splash-in events and evaporator water replenishment events in real time, according to the water level difference in a continuous time period, superimposing the water level net increment of the splash-in event and the water replenishment event, and finally outputting the evaporation amount Epan. Specifically, the following steps are included:

[0049] S21. Collecting the water level height H of the inner cylinder of the evaporator through a weight sensor at a set frequency t ;

[0050] S22. Calculating the water level change rate of adjacent time points

[0051] S23. Event detection and classification: if 0<ΔH rate ≤δ splash , δ splash ∈[3,10] mm / min, it is marked as a water splash-in event; if δ refill <ΔH rate ≤200, δ refill ∈[50,150] mm / min, it is marked as an evaporator water replenishment event; the water splash-in event includes pesticide spraying, sprinkling irrigation, humidification and rainfall, etc.

[0052] S24. Daily evaporation amount calculation:

[0053] Recording the reference water level H ref at a fixed time T ref,day every day;

[0054] Calculating the net increment sum ∑ΔH splash of the water splash-in event and the net increment sum ∑ΔH refill of the evaporator water replenishment event in adjacent fixed times;

[0055] Daily evapotranspiration Epan=(H ref,day-1 -H ref,day )+∑ΔH splash +∑ΔH refill

[0056] The calculation formula of the net increment sum of the water splash-in event in adjacent fixed times is:

[0057] ∑ΔH splash=∑ t∈溅水事件 (H start -H end )

[0058] Evaporation effect on water level change during the event is not corrected.

[0059] The calculation formula of the total net increment of the evaporator water replenishment event is:

[0060] ∑ΔH refill =∑ t∈补水事件 (H start -H end )。

[0061] S3. Calculate the evapotranspiration ETc of cut chrysanthemum per unit area: calculate the evapotranspiration of cut chrysanthemum according to the formula ETc=Kc×Epan.

[0062] S4. Calculate the water requirement Q of cut chrysanthemum in the area: calculate the water requirement of cut chrysanthemum in the area according to the planting area A and the formula Q=(ETc-∑ΔH splash )×A.

[0063] Example 2

[0064] As Figure 1 and Figure 2 shown, the device for accurately obtaining the water requirement of cut chrysanthemum of the embodiment comprises a weighing unit and a control unit, the weighing unit comprises an evaporator, the bottom of the evaporator is provided with an upper support 2 and a lower support 3, and a weight sensor 1 (range 0-20 kg, accuracy ±0.1 g) is fixed between the upper support 2 and the lower support 3; the weight sensor 1 is fixed on the aluminum alloy upper support and the lower support through bolts. The evaporator comprises an outer cylinder 6 and an inner cylinder 5, both the outer cylinder 6 and the inner cylinder 5 are made of stainless steel, the outer cylinder 6 is fixed above the upper support 2 and is fixed through the clamping hole 4 on the upper support 2, and the inner cylinder 5 is coaxially nested in the outer cylinder 6. The height of the stainless steel cylindrical outer cylinder is 2-4 cm higher than that of the stainless steel cylindrical inner cylinder, and the distance between the cylinders is 0.5-1.0 cm. The double-cylinder nested design effectively blocks rain splashing, wind disturbance and solar radiation heat effect, and ensures the accuracy of the evaporation data.

[0065] The control unit comprises a case 7, the case 7 is connected with the weight sensor 1 through a core wire 11 for receiving the signal of the weight sensor 1. An RS485 industrial control screen 8 is integrated on the case 7, the RS485 industrial control screen 8 is programmed for executing the above-mentioned method, and has a data interaction interface, supports setting the planting date, the planting area, and querying the historical value by date. A power supply 12 is arranged in the case 7 for providing power for the whole device (industrial control screen, weight sensor); a waterproof wire hole 10 is opened on the side wall of the case 7 for leading in and out of the core wire 11, and ensures a certain waterproof and dustproof performance. A handle 9 is arranged on the upper part of the case 7 for facilitating the staff to move and deploy the device in the greenhouse.

[0066] The device for accurately obtaining the water requirement of cut chrysanthemums in this embodiment can be associated with a greenhouse irrigation control system, and accurate and automatic irrigation control can be performed according to the obtained water requirement of the cut chrysanthemums.

[0067] Example 3

[0068] The test site is located in Yunnan Province, which has an altitude of 1300 m, an average annual temperature of 19.8℃, an average annual precipitation of about 850 mm, and an average annual evaporation of about 2039 mm. The test material is planted in the company's test greenhouse, which is north-south oriented, 16 m long, 9.6 m wide, 5.0 m high at the top, and 4.5 m high at the shoulder.

[0069] In this embodiment, two batches of dynamic measurement experiments of water requirement of cut chrysanthemums during the whole growth period were carried out in a film greenhouse from March 2022 to October 2022, using multi-flower chrysanthemums 'Nannong Xiaojinxing' and 'Ruiduostbai' as test materials. Potted method was used, the top diameter of the flowerpot was 22 cm, the bottom diameter was 18 cm, the pot height was 15 cm, 3 plants were planted in each pot, 6 plants were placed in a tray, and 6 pots were set as one plot, with 3 replicates. The pot soil was configured in a ratio of 2:2:1 of garden soil: grass charcoal: perlite.

[0070] Monitoring of water requirement of cut chrysanthemums during the whole growth period

[0071] An electronic scale was placed under the edge of each tray, and the weight data W of the tray was collected at a fixed time every day i , the daily weight change ΔW = W i-1 -W i without watering and fertilizing. The main reason is the transpiration of cut chrysanthemums and soil evaporation. According to the literature, 100 g of water is transpired by plants, and the fresh weight theoretically increases by 1 g-3 g; therefore, the daily water requirement ETc of cut chrysanthemums == 1.02ΔW / planting area on the tray. From the beginning of planting to the stop of cutting flowers.

[0072] Monitoring of water evaporation of cut chrysanthemums during the whole growth period

[0073] The water weight data W of the container was collected by the electronic scale at a fixed time every day (consistent with the tray weight collection time) t , the water level height H t = W t / S, the daily evaporation Epan = (H ref,day-1 -H ref,day )+∑ΔH splash +∑ΔH refill . From the beginning of planting to the stop of cutting flowers.

[0074] Measurement of leaf area index LAI of cut chrysanthemums during the whole growth period

[0075] Single plant leaf area LA measurement: 5 plants were selected for each variety, and the leaf length of each leaf position was measured every 7 days. The leaf area measurement method was as follows: the leaf was placed on A4 paper, a 1 cm scale was drawn, a camera was used to take a picture, and then the leaf area and leaf length of the single leaf were measured by Image J software to determine the linear relationship between the leaf area and the square of the leaf length. The calculation formula of the single plant leaf area and the leaf area index of cut chrysanthemum was as follows: wherein LA was the single plant leaf area (cm 2 / pl), L i was the leaf length of the i-th leaf, and a was the linear regression slope of the leaf area and the square of the leaf length.

[0076] Leaf area index LAI calculation: LAI = LA * planting density.

[0077] Relationship between ETc, water evaporation amount Epan and cut chrysanthemum LAI

[0078] The relationship between ETc, water evaporation amount Epan and cut chrysanthemum LAI was as follows: ETc = Kc * Epan; wherein Kc was the crop coefficient. Kc = a * LAI^b; wherein a and b were fitting parameters.

[0079] Excel software was used for data statistics, arrangement, summary and drawing.

[0080] According to the formula Kc = ETc / Epan, the crop coefficient Kc value of cut chrysanthemum at each week after planting could be obtained, as shown in Table 1. The Kc values of the two varieties were different, with a difference of ±0.1 to ±0.4. With the increase of the rooting weeks, the Kc value gradually increased and tended to be stable after the 7th week to the 8th week. The increase of the Kc value of cut chrysanthemum was mainly due to the increase of the leaf area index, and according to Table 1, the change trend of the Kc value was basically consistent with that of the LAI value.

[0081] Table 1 Leaf area index LAI and crop coefficient Kc of cut chrysanthemum at each week after planting

[0082]

[0083]

[0084] Example 4

[0085] The test site was located in Hufu Chrysanthemum Garden in Jiangning District, Nanjing City, Jiangsu Province, with an altitude of about 15 m, a multi-year average temperature of about 16.0℃, an average annual precipitation of about 1106.5 mm, and a multi-year average evaporation of about 1560 mm. The test was carried out in a continuous glass greenhouse, each greenhouse was 16 m long, 9 m wide and 4.0 m high, and each had a 1 m wide ventilation belt at the top and bottom.

[0086] This example was carried out in Nanjing City, Jiangning District, Hufu Chrysanthemum Garden glass greenhouse from December 2023 to December 2024, with multi-headed cut chrysanthemum 'Nannong Danxin', 'Nannong Xiaojinxing' and 'Ruiduostbai' as experimental materials. Four batches of dynamic measurement experiments of water demand of cut chrysanthemum during the whole growth period were carried out. Potted way was adopted, the top diameter of the flowerpot was 22 cm, the bottom diameter was 18 cm, the pot height was 15 cm, 3 plants were planted in each pot, 6 plants were placed in a tray, 6 pots were set as a small area, and 3 repeats were set. The pot soil was configured in a ratio of 2:2:1 of garden soil:peat:perlite. Small water pump was used for water and fertilizer integrated drip irrigation, and the water and nutrient supply of cut chrysanthemum was ensured according to the enterprise water and fertilizer management mode.

[0087] Monitoring of water requirement of cut chrysanthemum during the whole growth period

[0088] A weight sensor (range 30 Kg, accuracy 0.1 g; manufacturer: Bengbu Hengyuan Sensor) was placed under the edge of each tray, as shown in Figure 3 , the weight data W i of the tray was collected at a fixed time every day without watering and fertilizing, and the daily weight change ΔW=W i-1 -W i . It is mainly due to transpiration and soil evaporation of cut chrysanthemum. According to the literature, the fresh weight of plant transpiration is theoretically increased by 1g-3g per 100g of water; therefore, the daily water requirement ETc of cut chrysanthemum is equal to 1.02ΔW / planting area on the tray. From the beginning of planting to the stop of cutting chrysanthemum.

[0089] Monitoring of water evaporation of cut chrysanthemum during the whole growth period

[0090] The weight data W t and water level height H t of the water evaporation measuring device were collected at a fixed time (consistent with the tray weight collection time) every day, the water level height H t was equal to W ref,day-1 / S, and the daily evaporation Epan was equal to (H ref,day -H splash )+∑ΔH refill . From the beginning of planting to the stop of cutting chrysanthemum.

[0091] Measurement of leaf area index LAI of cut chrysanthemum during the whole growth period

[0092] The same as example 3.

[0093] Relationship among ETc, water evaporation Epan and LAI of cut chrysanthemum

[0094] The same as example 3.

[0095] Data statistics and analysis

[0096] The same as example 3.

[0097] Figure 3 and Figure 4 The dynamic changes of ETc and Epan of cut chrysanthemum from the vegetative growth stage to the flower bud differentiation stage are shown in the figure. As the cut chrysanthemum grows, the water requirement ETc of the cut chrysanthemum gradually increases, which is the same as the rule in example 3. Epan is only driven by the greenhouse environment, and its value fluctuates in the range of 1mm to 4mm. ETc is affected by the increase of leaf area index of cut chrysanthemum in addition to the environment. The greater the leaf area index, the greater the area that can be transpired by the cut chrysanthemum. Moreover, the value of ETc / Epan is getting larger and larger.

[0098] Figure 5 The dynamic changes of ETc and Epan of cut chrysanthemum from the flower bud swelling stage to the flower picking stage are shown in the figure. At this time, the fluctuations between ETc and Epan are basically the same, and the value of ETc / Epan tends to be stable, which is consistent with the rule in example 3. The average value of ETc / Epan obtained by the cut chrysanthemum every week is taken as the Kc value and the corresponding LAI value of each week after planting, which is shown in table 2. The change rule of Kc and LAI in the table is consistent with the rule in example 1.

[0099] Table 2 Leaf area index LAI and crop coefficient Kc of cut chrysanthemum in each week after planting

[0100]

[0101]

[0102] The relationship between crop parameters Kc and leaf area index LAI in the tests in Yunnan and Jiangsu is fitted by a power function curve, as shown in Figure 6 and Figure 7 Based on these relationships, the dynamic crop parameters of cut chrysanthemum can be inferred according to the leaf area index of cut chrysanthemum.

[0103] Based on the results of example 3 and example 4, a prediction model is established by the time after planting of cut chrysanthemum and the crop coefficient Kc value, as shown in Figure 8 The model result is The daily crop coefficient of cut chrysanthemum after planting is calculated; in the formula, x is the number of days after planting, a, k and x0 are empirical parameters related to crops, and the parameters a of cut chrysanthemum are 4.56-4.65, the value of k is 0.091-0.099, and the value of x0 is 15.41-16.29.

Claims

1. A method for accurately obtaining the water requirement of cut chrysanthemum, characterized in that, The method comprises the following steps: S1. Obtain the cut chrysanthemum adaptive crop coefficient Kc: According to the planting date and formula The daily crop coefficient of cut chrysanthemum after planting is calculated, wherein x is the number of days after planting, and a, k and x0 are empirical parameters related to the crop. S2. Anti-interference evaporation amount Epan acquisition: collect the water level height H in the evaporator inner cylinder at a set frequency t , adopt dynamic threshold method to detect water splash event and evaporator water replenishment event in real time, according to the water level difference in the continuous time period, superimpose the water level net increment of splash event and water replenishment event compensation, and finally output the evaporation amount Epan; S3. Calculating the evapotranspiration ETc of the cut chrysanthemum per unit area: calculating the evapotranspiration of the cut chrysanthemum according to the formula ETc=Kc×Epan; S4. Cut Chrysanthemum Water Requirement Q Calculation of Area: According to the planting area A and the formula Q = (ETc-∑ΔH splash ) × A, the water requirement of cut chrysanthemum in the area is calculated, ∑ΔH splash is the total sum of net increments of splash events in adjacent fixed time.

2. The method for accurately obtaining water requirement of cut chrysanthemum according to claim 1, characterized in that, The anti-interference evaporation Epan is obtained, specifically The method comprises the following steps: S21, collect the water level height H in the inner cylinder of the evaporator by the weight sensor at a set frequency t ; S22, calculate the water level change rate at the adjacent time S23, event detection and classification: if 0 < ΔH rate ≤ δ splash splash ∈ [3, 10] mm / min, then mark as a splash event; if δ refill < ΔH rate ≤ 200, δ refill ∈ [50, 150] mm / min, then mark as an evaporator top-up event;​ S24, calculating the daily evaporation.

3. The method for accurately obtaining water requirement of cut chrysanthemum according to claim 2, characterized in that, The daily evaporation is calculated, specifically comprising: Fixed time T per day ref Record reference water level H ref,day ; Sum of net increments of splash events in adjacent fixed times ∑ΔH splash and the net increment sum of evaporator water replenishment events ∑ΔH refill ; Daily evapotranspiration Epan = (H ref,day-1 - H ref,day +∑ΔH splash +∑ΔH refill .

4. The method for accurately obtaining water requirement of cut chrysanthemum according to claim 3, characterized in that, The calculation formula of the total sum of the net increment of the splash event in the adjacent fixed time is: ∑ΔH splash =∑ t∈溅水事件 (H start -H end ) The change of the water level caused by the evaporation during the event is not corrected.

5. The method for accurately obtaining water requirement of cut chrysanthemum according to claim 4, characterized in that, The splash event includes spraying, sprinkling irrigation, humidifying and raining.

6. The method for accurately obtaining water requirement of cut chrysanthemum according to claim 3, characterized in that, The calculation formula of the total sum of the net increment of the water replenishment event of the evaporator is: ∑ΔH refill =∑ t∈补水事件 (H start -H end ).

7. The method for accurately obtaining water requirement of cut chrysanthemum according to claim 1, characterized in that, The parameters a, k and x0 adapted to the cut chrysanthemum are as follows: the value of a is 4.56-4.65, the value of k is 0.091-0.099, and the value of x0 is 15.41-16.

29.

8. The method for accurately obtaining water requirement of cut chrysanthemum according to claim 7, characterized in that, The parameters adapted to the cut chrysanthemum are calibrated through multiple batches of field tests.

9. An apparatus for accurately obtaining water requirement of cut chrysanthemum, characterized in that, The device is suitable for the method for accurately obtaining the water requirement of the cut chrysanthemum according to any one of claims 1-8, comprising a weighing unit and a control unit, the weighing unit comprising an evaporator, the bottom of the evaporator being provided with an upper support and a lower support, and a weight sensor being fixed between the upper support and the lower support; the control unit comprising a machine box, the machine box being connected with the weight sensor.

10. The apparatus for accurately obtaining water requirement of cut chrysanthemum according to claim 9, wherein, The evaporator comprises an outer cylinder and an inner cylinder, the outer cylinder being fixed above the upper support, and the inner cylinder being coaxially nested in the inner part of the outer cylinder.

Images