TW201839378A - Planting environment moisture detection method capable of providing accurate measurement of soil moisture - Google Patents

Abstract

The present invention relates to a planting environment moisture detection method, which comprises the steps of first detecting at least one planting environment sample to obtain an initial conductivity of the sample and an initial dielectric constant of the sample, and injecting a fixed amount of moisture into the planting environment sample to change the specific humidity, and then detecting again to obtain variable conductivity of a plurality of samples and variable dielectric constant of the plurality of samples, and then calculating the initial conductivity of the sample, the initial dielectric constant of the sample, the variable conductivity of each sample, and the variable dielectric constant of each sample to generate a plurality pairs of comparison values, extracting a portion of each pair of comparison values having similar values to generate at least one regression value; obtaining and testing at least one sample to be tested corresponding to the planting environment sample to obtain the conductivity to be tested and the dielectric constant to be tested, and calculating the conductivity to be tested, the dielectric constant to be tested, and the regression value to obtain the moisture content of the plant sample to be tested, thereby enabling the present invention to achieve practical advance in accurate measurement of soil moisture.

Description

 Planting environment moisture detection method  

The invention provides a method for detecting planting environment moisture, in particular to a planting environment moisture detecting method capable of accurately measuring soil moisture.

In order to be able to measure the moisture content of the soil for intelligent control, or real-time monitoring, there are various different methods for measuring moisture in the past, and the current technology is more mature with Time Domain Reflectometry (TDR). And Frequency Domain Reflectometry (FDR).

The soil is a mixture of particulate solids, air, and water. The dielectric constant of air is about 1, and the dielectric constant of water is about 80. Therefore, the dielectric constant of soil varies with its water content. ~81 changes; but after actual experimental tests, the soil will affect its conductivity with the difference of fertilization degree, and when its actual water content reaches a certain level, it will have an error with the moisture content measured by the conventional moisture measurement method. And the error value will increase as the water content increases.

For example, the soil dielectric constant measured by FDR is K, which contains the real and imaginary parts. The formula is defined as: K = K'-i(K" + σ _dc /2π f ε ₀ ).

Where K' and K" represent the real and imaginary parts of the dielectric constant; σ _dc is the conductivity; ε ₀ is the dielectric constant in free space (vacuum) = 8.85 × 10 _-12 m _-3 kg _-1 s ⁴ A ² ; f is the frequency of the stimulus signal, which shows that when σ _{dc is} large, it will cause a large measurement error.

The "Topp empirical formula" calculates the equivalent soil volumetric moisture content of a solution with a dielectric constant of ε, calibrates the sensor and evaluates the performance of the sensor. The formula is: Θ _ν =-5.3 x 10 ^-2 +ε x 2.92 x 10 ^-2 - ε ² x 5.5 x 10 ^-4 + ε ³ x 4.3 x 10 ^-6 , and Θ _ν is the equivalent soil volume moisture content of the solution, although the "Topp empirical formula" can be used in a state where the soil is completely non-conductive. The soil moisture is derived from the real part K of the dielectric constant, but the soil fertility of the commonly grown loam cannot be zero (the fertilizer will increase the soil conductivity), so the "Topp empirical formula" cannot be directly applied due to errors. .

In addition, the effect of soil electrical conductivity (fertilization) [EC(dS/m)] on the dielectric constant [K] of FDR measurement is explained and added to the same soil saturated extract (soil: water = 1:5). Different concentrations of sodium chloride (NaCl) are used to regulate the soil σ _dc (conductivity) and will be measured, and the measurement results will be listed and plotted:

It is clear that the dielectric constant [K] and the electrical conductivity [EC(dS/m)] of each saturated soil aqueous solution are measured by FDR, and a regression curve can be generated in the figure. :K(Dielectric Constant)=78.19+1.88*EC(dS/m)+0.35*(EC(dS/m)-2.6)^2 R ² =0.973

As shown in the above table, the larger the [EC(dS/m)] is, the more errors are generated. It can be clearly seen that when [EC(dS/m)] is larger than 1.3dS/m, the error will start to occur, and the maximum is 45% (EC=6.3dS/m).

Therefore, how to solve the above problems and deficiencies in the above-mentioned applications, that is, the inventors of the present invention and those involved in the industry are eager to study the direction of improvement.

Therefore, the inventors of the present invention have collected the relevant materials in view of the above-mentioned deficiencies, and through multi-party evaluation and consideration, and through years of experience accumulated in the industry, through continuous trial and modification, the design of such soils can be accurately measured. Patent inventor of moisture planting environment moisture detection method.

The main purpose of the invention is to improve the accuracy of the moisture measurement of the soil.

In order to achieve the above object, the method of the present invention firstly tests at least one dry planting environment sample to obtain initial conductivity of the sample and the initial dielectric constant of the sample, and injects a certain amount of water into the planting environment sample in stages. Sexually change the humidity ratio, and then perform the detection again to obtain the complex conductivity of the plurality of samples, and the dielectric constant of the plurality of samples, and the initial conductivity, the initial dielectric constant of the sample, the conductivity of each sample, and the conductivity of each sample, And varying the dielectric constant of each sample to calculate a complex contrast value, and extracting a portion closer to each comparison value to generate at least one regression value;

Then, at least one sample to be tested conforming to the planting environment sample is taken, and the test is performed to obtain the conductivity to be inspected, and the dielectric constant to be tested, and the conductivity to be tested, the dielectric constant to be tested, and the regression value are calculated. In order to obtain the moisture content of the plant sample to be tested to reduce the error value, the above technology can be used to break through the problem that the error value of the conventional moisture measurement method increases with the increase of the water content, so as to accurately measure the soil. Practical advancement of moisture.

1‧‧‧ planting environment samples

2‧‧‧Oven

3‧‧‧Detection device

4‧‧‧After planting samples

5‧‧‧Electronic equipment

The first figure is a schematic diagram of the steps of a preferred embodiment of the invention.

The second drawing is a schematic view of the drying of the preferred embodiment of the invention.

The third figure is a schematic view of the detection of the preferred embodiment of the present invention.

The fourth figure is a schematic view of the injection of the preferred embodiment of the present invention.

The fifth drawing is a schematic diagram of the calculation of the preferred embodiment of the present invention.

The sixth drawing is a schematic diagram of the extraction of the preferred embodiment of the present invention.

Figure 7 is a schematic diagram of the detection regression of the preferred embodiment of the present invention.

In order to achieve the above objects and effects, the technical means and the structure of the present invention will be described in detail with reference to the preferred embodiments of the present invention.

Please refer to the first to seventh embodiments, which are schematic diagrams of the steps, the drying diagram, the detection diagram, the injection diagram, the calculation diagram, the extraction diagram, and the regression diagram of the preferred embodiment of the present invention, which can be clearly seen from the figure. The steps of the present invention are (a) detecting the initial conductivity of the sample and the initial dielectric constant of the sample, (b) detecting the change conductivity of the sample and the dielectric constant of the sample, (c) generating a contrast value, (d) generating a regression value, (e) detecting the conductivity to be tested and the dielectric constant to be tested, and (f) calculating the water content.

With reference to the second figure, in the present invention, the step (a1) of the step (a) is first carried out: a specific volume of the planting environment sample 1 is taken out, and in the present embodiment, the planting environment sample 1 is used as the soil as an explanation, and the planting environment Sample 1 contains sand, loam, soil, peat soil, peat moss, organic culture soil, coco peat, peat soil, peat, coconut carbon soil, coconut soil, sandy soil, special culture soil for cuttings, field soil, easy soil cultivation, One of the coconut soil, the coconut brick, or the coconut fiber soil is implemented in the present embodiment in five different planting environment samples 1, as exemplified below.

Then proceeding to step (a2): heating the planting environment sample 1 at room temperature for 1 to 24 hours through at least one oven 2 to ensure that it is in a dry state, and referring to the third figure, performing step (a3): at least one detecting device 3 The planting environment sample 1 is tested to obtain a sample initial conductivity [EC (dS/m)], and a sample initial dielectric constant [K], wherein the detecting device 3 is a soil moisture meter.

Then, referring to the fourth figure, step (b) is performed by injecting a certain amount of water into the planting environment sample 1 to change the humidity ratio, and then detecting again by the detecting device 3 to obtain a plurality of sample varying conductivity [EC(dS/m)] And the plural sample changes the dielectric constant [K], and the action of injecting a certain amount of water can be divided into a plurality of stages to gradually inject, to gradually change the humidity ratio of the planting environment sample 1, and refer to the fifth figure to perform the steps ( c): the initial conductivity of the sample [EC (dS / m)], the initial dielectric constant [K] of the sample, the conductivity of each sample [EC (dS / m)], and the dielectric constant of each sample [K] Performing calculations to generate a plurality of comparison values, in the present embodiment, is performed by calculation through at least one electronic device 5 (such as a computer, etc.), wherein it can be clearly seen that when each of the aforementioned electrical conductivities [EC(dS/m)] is When the value is high, the larger the comparison value with each of the above dielectric constants [K], that is, the larger the error value, and then the sixth step, the step (d): extracting the portions where the comparison values are closer to each other {this embodiment Extracting a portion having a conductivity of less than 2 [EC (dS/m)] through at least one electronic device 5 (such as a computer) Explain} to generate at least one regression value, for example, the extraction result is: Soil1: K = 29.76 + 1.66 * EC; Soil2: K = 31.29 + 1.63 * EC; Soil3: K = 32.98 + 1.76 * EC; Soil4: K = 32.65 + 1.67 * EC; Soil 5: K = 32.78 + 1.66 * EC.

Among them, Soil1 has a regression value of (K-1.66*EC) when each conductivity is less than 2 [EC(dS/m)].

Referring to the seventh figure, step (e) is further performed: at least one sample 4 to be tested corresponding to the planting environment sample 1 is taken, and detected by the detecting device 3 to obtain the conductivity to be detected [EC (dS/) m)], and the dielectric constant [K] to be tested, and performing step (f): calculating the conductivity and the regression value to obtain the correct moisture content of the plant sample 4 to be inspected, and calculating through at least one electron Equipment 5 (such as a computer) is assisted, and the calculation method is: Soil1 correct moisture content = -5.3 x 10 ^-2 + (K-1.66*EC) x 2.92 x 10 ^-2 -(K-1.66*EC) ² x 5.5 x 10 ^-4 +(K-1.66*EC) ³ x 4.3 x 10 ^-6 .

In addition, the type of planting environment sample 1 and the corresponding regression values are used in conjunction with the establishment of at least one soil data for subsequent use.

Therefore, the key to improving the conventional application of the planting environment moisture detecting method of the present invention is to: by detecting and calculating the regression value corresponding to the planting environment sample 1, and bringing the regression value into (corresponding to the planting environment sample 1) The conductivity [EC(dS/m)] and the dielectric constant [K] of the plant sample 4 to be tested are calculated to calculate the correct moisture content, and the practical progress of accurately measuring the soil moisture is achieved.

However, the above description is only the preferred embodiment of the present invention, and thus it is not intended to limit the scope of the present invention. Therefore, the simple modification and equivalent structural changes of the present specification and the drawings should be treated similarly. It is included in the scope of the patent of the present invention and is combined with Chen Ming.

In summary, the planting environment moisture detecting method of the present invention can achieve its efficacy and purpose when used, so the invention is an invention with excellent practicability, and is an application for conforming to the invention patent, and submits an application according to law. I hope that the trial committee will grant the invention as soon as possible to protect the inventor's hard work. If there is any doubt in the audit committee, please do not hesitate to give instructions, the inventor will try his best to cooperate and feel polite.

Claims (7)

 A method for detecting environmental moisture in a plant, the steps of which are: (a) detecting at least one planting environment sample to obtain initial conductivity of the sample and initial dielectric constant of the sample; (b) injecting a certain amount of moisture into the planting environment sample Changing the humidity ratio, and then performing the detection again to obtain the complex sample change conductivity and the complex sample change dielectric constant; (c) the initial conductivity of the sample, the change conductivity of each sample, the initial sample dielectric constant, and the foregoing Calculating the dielectric constant of each sample to generate a complex comparison value; (d) extracting a portion closer to each of the aforementioned comparison values to generate at least one regression value; (e) at least one plant to be tested conforming to the planting environment sample The sample is tested to obtain the conductivity to be tested and the dielectric constant to be tested; and (f) calculating the conductivity to be detected, the dielectric constant to be tested, and the regression value to obtain the water content of the sample to be tested. rate.    The planting environment moisture detecting method according to claim 1, wherein the step (a) comprises the step (a1): taking out a specific volume of the planting environment sample; and the step (a2): passing at least one oven at 105 degrees C Heating the planting environment sample for twenty-four hours; and step (a3): detecting the planting environment sample with at least one detecting device.    The planting environment moisture detecting method according to claim 2, wherein the detecting device described in the step (a3) is a soil moisture meter.    The planting environment moisture detecting method according to Item 1 of the patent application, wherein the planting environment sample described in the step (a) comprises sand, loam, soil, peat soil, peat moss, organic culture soil, coco peat, peat soil. , peat, coconut carbon soil, coconut soil, sandy soil, special culture soil for cutting, soil, easy to grow soil, coconut soil, coconut brick, or coconut fiber soil.    The method for detecting a planting environment moisture according to claim 1, wherein the action of injecting a certain amount of water in the step (b) can be divided into a plurality of stages to gradually inject to gradually change the humidity ratio.    The planting environment moisture detecting method according to claim 1, wherein the calculating of the steps (c), (d), and (f) is performed by at least one electronic device.    The planting environment moisture detecting method according to claim 1, wherein the type of the planting environment sample described in the step (a) and the regression value described in the corresponding step (d) are combined to establish at least one soil data. .