CN2295219Y - Soil crop-producing-power detector - Google Patents

Soil crop-producing-power detector Download PDF

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Publication number
CN2295219Y
CN2295219Y CN 97236400 CN97236400U CN2295219Y CN 2295219 Y CN2295219 Y CN 2295219Y CN 97236400 CN97236400 CN 97236400 CN 97236400 U CN97236400 U CN 97236400U CN 2295219 Y CN2295219 Y CN 2295219Y
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China
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circuit
soil
electrode
casing
conductance
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CN 97236400
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Chinese (zh)
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苏渝生
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Institute of Soil Science of CAS
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Institute of Soil Science of CAS
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Abstract

The utility model provides a soil crop-producing-power detector, which is composed of a casing, a combined monolithic circuit and a detector. A data display window, mutual locking item selection keys, and the positioning key and the standard key corresponding to a relative item are opened on the panel of the casing, the sensors is inserted and connected with the relative plug interfaces of the sensor of the back panel of the casing through respectively high insulation shielding plugs, and a reference electrode inserting interface and a power supply socket are arranged on the back panel of the casing simultaneously.

Description

The soil fertility analyzer
The utility model belongs to the Electrochemical Measurement Technology field, relates to a kind of fertility analyzer, particularly a kind of multifunction soil fertility analyzer.
The content of Soil Nitrogen, phosphorus, potassium is the basic index of soil fertility, is the rational application of fertilizer, the important evidence that guarantees agriculture harvest.In the past, the mensuration of Soil Nitrogen, phosphorus, potassium is continued to use the laboratory classical approach always and is measured, as decide nitrogen and adopt the KShi method, survey phosphorus and adopt photoelectric colorimetry, survey potassium and adopt flare photometer etc., except that sample-processing equipment, the general volume bulkiness of these instruments is not suitable for the examination of field or basic agriculture and grinds station, platform mensuration.The researchist has designed the wsoil-nutriment fast analyser based on photoelectric colorimetry for many years, as in the Shanghai Chemical Research Inst of the Ministry of Chemical Industry on October 28th, 1994 " ST-2 type wsoil-nutriment fast analyser is used training seminar's technical information " disclosed " ST-2 type wsoil-nutriment fast analyser "; " the digital direct-reading chemical fertilizer in soil of the TFC-1 type tacheometer " that Beijing prosperous and powerful analytical instrument manufacturing center produced in 1996, these two kinds of instruments are all based on photoelectric colorimetry, require sample (soil extraction or water sample) transparent, limpid, its measurement range of while is narrower, and (general colourimetry is a number order magnitude range, otherwise the typical curve that will prepare different range separately), the soil liquid or water sample muddy, that have suspended particles can not be used in, the mensuration of this several magnitude of concentration change can not be once be used in.
The purpose of this utility model is to provide a kind of multifunction soil fertility analyzer based on electrochemical process, to overcome existing problem in the prior art.
The utility model is realized in the following manner: a kind of soil fertility analyzer, by casing, combined type monolithic integrated circuit and sensor are formed, offer the data presentation window on the panel of described casing, be provided with the positioning key and the aligning key of interlocking-type project choice key and respective item simultaneously, its key is to include the nitrate radical electrode of measuring nitrate nitrogen in the soil in the sensor, measure the potassium electrode of potassium in the soil, measure the ammonia gas-sensing electrode of nitrogen in the soil, measure the pH electrode of soil acidity or alkalinity, measure the platinum electrode and the contrast electrode of oxidation-reduction potential in the soil, include display circuit and potential method circuit in the above-mentioned combined type monolithic integrated circuit, this potential method circuit is made of high input impedance change-over circuit and low-resistance DC voltage amplifying circuit, low-resistance DC voltage amplifying circuit is through transmitting the resistance continued access on the high input impedance change-over circuit, display circuit then continued access on the voltage divider that output terminal connected of low-resistance DC voltage amplifying circuit, in the combined type monolithic integrated circuit, also include simultaneously positioning circuit and calibration circuit, positioning circuit is gone into the input end of high input impedance change-over circuit by the contrast electrode termination, calibration circuit then is connected between the output terminal and reverse input end of low-resistance DC voltage amplifying circuit, under the situation of using direct coupled single-ended input high input impedance change-over circuit, calibration circuit also can be connected on the output terminal of this circuit, the high insulation shielding plug of the sensor by separately is plugged on the casing rear panel on the corresponding sensor interface, also is provided with contrast electrode interface and supply hub on the rear panel of casing simultaneously.
Above-mentioned high input impedance change-over circuit is preferably direct-coupled DC converting circuit, also can be that the ac modulation change-over circuit adds rectification circuit.
Can measure the phosphorus in the soil in order to make this soil fertility analyzer, and can make this soil fertility analyzer be applicable to basic agriculture testing station and field test, can in related sensor, set up a fibre-optical probe of measuring phosphorus in the soil again, while also corresponding photoelectric switching circuit that has additional in the combined type monolithic integrated circuit, this photoelectric switching circuit is made of photoelectric commutator and impedance transformation and amplifying circuit, photoelectric commutator inserts the input end of impedance transformation and amplifying circuit by divider resistance, the output termination display circuit of impedance transformation and amplifying circuit, also be provided with simultaneously on the rear panel of casing and survey phosphorus with fibre-optical probe interface and zeroing turn-knob, fibre-optical probe is plugged on the fibre-optical probe interface on the casing rear panel by oneself plug.
Above-mentioned photoelectric commutator can be light-sensitive cell, photoresistance or photodiode.
Can measure the salt content in the soil in order to make this soil fertility analyzer, can in related sensor, set up a conductance electrode of measuring salt content in the soil again, while also corresponding conductance method circuit that has additional in the combined type monolithic integrated circuit, this conductance method circuit is by the fixed ampllitude oscillatory circuit, impedance transformation amplifying circuit and linear rectification circuit constitute, the output terminal of fixed ampllitude oscillatory circuit is connected to an end of conductance cell by transmission resistance and follower, the input end of another termination impedance transformation amplifying circuit of conductance cell, and the output terminal of impedance transformation amplifying circuit is connected to the input end of linear rectification circuit through coupling capacitance, the output terminal of linear rectification circuit connects display circuit by voltage divider, also be provided with conductance electrode interface and range switch on the rear panel of casing simultaneously, conductance electrode is plugged on the conductance electrode interface on the casing rear panel by oneself plug.
Can measure the content concn of dissolved oxygen DO in the soil liquid in order to make this soil fertility analyzer, can in related sensor, set up a dissolved oxygen electrode of measuring dissolved oxygen DO in the soil liquid again, while also corresponding voltammetry circuit that has additional in the combined type monolithic integrated circuit, this voltammetry circuit is made up of polarizing voltage generation circuit and operational amplification circuit, polarizing voltage generation circuit connects the anode of dissolved oxygen electrode, the negative electrode of dissolved oxygen electrode connects the positive input of operational amplification circuit, the output terminal of operational amplification circuit connects display circuit through voltage divider, simultaneously between the output terminal of operational amplification circuit and its positive input, be serially connected with variable resistor, in order to regulate the enlargement ratio of operational amplification circuit, also be provided with the dissolved oxygen probe interface on the rear panel of casing simultaneously, dissolved oxygen probe is plugged on the dissolved oxygen probe interface on the casing rear panel by oneself plug.
Can measure the soil moisture in order to make this soil fertility analyzer, can in related sensor, set up a temp probe of measuring the soil moisture again, while also corresponding temperature measuring circuit that has additional in the combined type monolithic integrated circuit, also be provided with the temp probe interface on the rear panel of casing simultaneously, temp probe is plugged on the temp probe interface on the casing rear panel by oneself plug.
It is common available circuit that said temperature is measured circuit, when temp probe uses semiconductor thermistor or tinsel thermistor, can measure the circuit of resistance with bridge diagram or other, when temp probe uses the PN diode, can measure the small voltage circuit with high input impedance DC voltage amplifying circuit or other.
Because above-mentioned soil fertility analyzer comprises multiple circuit, other circuit and come arrogantly stray current potential method to be measured the problem of the AC and DC common mode interference of circuit when gathering together in order to eliminate different circuit, be preferably between the simulation ground of combined type monolithic integrated circuit and the actual the earth and set up a capacitor, this capacitor should be the non-polarized capacitor of a number microfarad, and the insulation resistance of this capacitor should be greater than 10 10Ohm, it can provide a low impedance path for exchanging the common mode interference electric current, makes it to be unlikely to flow through to produce the series mode interference voltage that exchanges after the internal resistance of contrast electrode, influences the stability of survey measurements.
Certainly, eliminate conductance circuit to the interference of other metering circuit and prevent from arrogantly AC and DC common mode and series mode interference measure also can connect a both-end high input impedance amplifier at the output position.
Below in conjunction with accompanying drawing shown in the embodiment the utility model is described in further detail.
Fig. 1 is the schematic appearance of this soil fertility analyzer;
Fig. 2 is the schematic appearance of casing rear panel;
Fig. 3 is the nitrate radical electrode and the synoptic diagram that cooperates of high insulation shielding plug;
Fig. 4 is the potassium electrode and the synoptic diagram that cooperates of high insulation shielding plug;
Fig. 5 is an ammonia gas-sensing electrode and the synoptic diagram that cooperates of high insulation shielding plug;
Fig. 6 is the pH electrode and the synoptic diagram that cooperates of high insulation shielding plug;
Fig. 7 is a platinum electrode and the synoptic diagram that cooperates of high insulation shielding plug;
Fig. 8 is the cooperate synoptic diagram of the fine probe of survey phosphorescence with dichotomous plug;
Fig. 9 is a conductance electrode and the synoptic diagram that cooperates of plug;
Figure 10 is a dissolved oxygen probe and the synoptic diagram that cooperates of plug;
Figure 11 is a temp probe and the synoptic diagram that cooperates of plug;
Figure 12 is the electric theory diagram of this soil fertility analyzer;
Figure 13 is the potential method electrical block diagram;
Figure 14 is the colourimetry electrical block diagram;
Figure 15 is the conductance method electrical block diagram;
Figure 16 is the voltammetry electrical block diagram;
Figure 17 is the temperature measuring circuit structural representation;
With reference to Fig. 1, on the panel 2 of casing 1, offer data presentation window 3, on panel 2, also be provided with the positioning key 5 and the aligning key 6 of interlocking-type project choice key 4 and respective item simultaneously.In conjunction with Fig. 2, the interface 8 that the rear panel 7 of casing 1 is provided with each sensor (comprises pH electrode interface 8a, nitrate radical electrode interface 8b, potassium electrode interface 8c, ammonia gas-sensing electrode interface 8d, platinum electrode interface 8e, contrast electrode interface 8f, dissolved oxygen probe interface 8g, temp probe interface 8b, conductance electrode interface 8i and the fine probe of survey phosphorescence interface 8j), bottom at conductance electrode interface 8i is provided with range switch 9, and be provided with the turn-knob 10 that returns to zero surveying the bottom of phosphorus with fibre-optical probe interface 8j, also be provided with supply hub 11 (comprising AC power jack 11a and direct current jack 11b) on the rear panel 7 of casing 1, potential method sensor 12 is engaged on its corresponding interface 8 through shielded conductor 13.
With reference to Fig. 3～Figure 11, nitrate radical electrode 12a fuses through shielded conductor 13 and high insulation shielding plug 14, potassium electrode 12b fuses through shielded conductor 13 and high insulation shielding plug 14, ammonia gas-sensing electrode 12c fuses through shielded conductor 13 and high insulation shielding plug 14, pH electrode 12d fuses through shielded conductor 13 and high insulation shielding plug 14, platinum electrode 12e fuses through shielded conductor 13 and high insulation shielding plug 14, surveying the fine probe of phosphorescence 12f fuses through light transmitting fiber 15 and dichotomous plug 16 (comprising 16a and 16b), conductance electrode 12g fuses through shielded conductor 13 and high insulation shielding plug 14, dissolved oxygen probe 12b fuses through Stranded cable 17 and multi-pin connector 18, and temp probe 12i fuses through shielded conductor 13 and plug 19.
With reference to Figure 12, this is the electric theory diagram of this soil fertility analyzer, 20 is display circuit among the figure, 21 for measuring the potential method circuit of soil acidity or alkalinity, 22 for measuring the potential method circuit of soil nitrate nitrogen, 23 for measuring the potential method circuit of soil potassium, 24 for measuring the potential method circuit of soil ammoniacal nitrogen, 25 for measuring the potential method circuit of redox of soil state, 26 for measuring the colourimetry circuit of soil phosphorus content, 27 for measuring the conductance method circuit of soil salt content, and 28 for measuring the voltammetry circuit of dissolved oxygen content in the soil liquid, and 29 for measuring the temperature measuring circuit of the soil moisture.
With reference to Figure 13, the potential method circuit is by two high input impedance amplifier IC 1-1And IC 1-2Constitute, formation was measured battery after indicator electrode IE (that is: the pH electrode of the nitrate radical electrode of nitrate nitrogen, the potassium electrode of measuring potassium in the soil, the ammonia gas-sensing electrode of measuring nitrogen in the soil or mensuration soil acidity or alkalinity in the mensuration soil) and contrast electrode RE were placed in the testing liquid, this output signal of measuring battery is a high internal resistance current potential, and this high internal resistance current potential is via R 4And C 2The input circuit of forming enters high input impedance amplifier IC 1-1Positive input, R 4And C 2Determined input signal the time ask constant, C 2Also has the effect of disturbing every exchanging, at high input impedance amplifier IC 1-1Output terminal and reverse input end between be serially connected with negative feedback resistor R 5, under degree of depth negative feedback state, high input impedance amplifier IC 1-1Stable working state, zero point drift can be ignored, and the output signal of measuring battery is through high input impedance amplifier IC 1-1Change the low-resistance output voltage signal later on into, through R 3Add to another high input impedance amplifier IC 1-2Positive input, high input impedance amplifier IC 1-2Output through R 10And W 3The bleeder circuit of forming draw one with solution to be measured in nitrate concentration (pNO 3 -), potassium concentration (pK +), the concentration (pNH of ammonia 3), the relevant output voltage V of pH (pH) xAdd to display circuit.R among the figure 6And R 9Be respectively high input impedance amplifier IC 1-1And IC 1-2Duty regulate resistance.Stabilized voltage supply-V is via R in biasing 1, R 2And W 1Provide a kind of bucking voltage (by W 1Regulate) be added to contrast electrode RE, the signal of measuring battery output is finished compensation or regulating action, also promptly locate capacitor C 1In order to eliminate the interference of part AC compounent.By R 7, R 8And W 2The slope adjustment device of forming is used to regulate high input impedance amplifier IC 1-2Anti-phase ratio amplification coefficient, also promptly the calibration.When indicator electrode IE when measuring the platinum electrode of oxidation-reduction potential in the soil, owing to do not relate to the problem of location and calibration, so can be with by high input impedance amplifier IC 1-1The low-resistance voltage signal of output directly adds to display circuit.
With reference to Figure 14, the light source of being launched by luminotron A shines fibre-optical probe through spectroscope or color filter, and then passes to photoelectric commutator C by optical fiber, and photoelectric commutator C just can produce a photocurrent relevant with phosphorus content, by R 11Join high input impedance amplifier IC after the dividing potential drop 2-1Positive input, negative feedback resistor R 16Be used to regulate high input impedance amplifier IC 2-1Stability and sensitivity, R 12, R 13, R 28And R 14Be the bucking voltage regulator, play the zeroing effect, by+V～-the biasing stabilized voltage supply of V is through R 12Take out certain bucking voltage and be added to high input impedance amplifier IC 2-1Reverse input end, high input impedance amplifier IC 2-1Output through R 17Be added to amplifier IC 2-2Reverse input end, power supply+V is through diode D 2, R 21, R 22And adjust pipe T generation galvanic current and press, add both-end input triode D via the N point 1Collector, triode D 1With R 20Formed for amplifier IC 2-2The negative feedback bucking voltage of high stability, its output is added to amplifier IC through the W point 2-3Positive input, R 25, R 26And R 27Be negative feedback resistor, be used to regulate the sensitivity and the degree of stability of instrument, amplifier IC 2-3Output terminal with the output voltage V relevant with phosphorus content μAdd to display circuit, R among the figure 15, R 19And R 24Be respectively amplifier IC 2-1, IC 2-2And IC 2-3The adjusting resistance of duty.
With reference to Figure 15, by high input impedance amplifier IC 3-1, C 3, R 29And R 30Formed oscillator (square-wave generator), R 29, C 3Determine time constant, therefore regulated R 29Can regulate the frequency of oscillator, R 31And R 32Be feedback resistance, D 3Be stabilivolt, play the fixed ampllitude effect, they have constituted an amplitude stabilizer oscillator together, and the output terminal of this amplitude stabilizer oscillator is via R 33And R 34The voltage divider that constitutes meets amplifier IC 3-2Positive input, amplifier IC 3-2Constitute a follower, and play the impedance transformation effect, amplifier IC 3-2Output terminal through conductance cell G xOr measuring resistance R xMeet scale operation amplifier IC 3-3Reverse input end, at scale operation amplifier IC 3-3Reverse input end and output terminal between be serially connected with potentiometer W 4, regulator potentiometer W 4Can obtain the signal of required conductance for alternating current, scale operation amplifier IC 3-3Output terminal through coupling capacitance C 4And resistance R 36Meet amplifier IC 3-4Reverse input end, amplifier IC 3-4And D 4, D 5Constitute linear rectifier, its output terminal is via R 40And C 5The wave filter that constitutes inserts by R 41And R 42The branch hydraulic circuit that constitutes, again by this minute hydraulic circuit with d. c. voltage signal V 6Deliver to display circuit.R among the figure 37, R 38And R 39For the bucking voltage regulator of stabilized voltage supply, by R 37The bucking voltage of taking out is added in above-mentioned amplifier IC 3-4Positive input, the output of linear rectifier is played the zeroing effect.R among the figure 43, R 35And R 44Be respectively amplifier IC 3-1, IC 3-2And IC 3-4The adjusting resistance of duty.
With reference to Figure 16, by I D, R 45, R 46The polarizing voltage generator of forming meets the anode of dissolved oxygen electrode EC, thermistor R tIn order to compensation I DThe temperature coefficient of operating voltage, the negative electrode of dissolved oxygen electrode EC connects the positive input of operational amplifier IC, the output terminal of operational amplifier IC is via R 50And R 51The voltage divider of forming connects display circuit.Between the positive input and output terminal of operational amplifier IC, be serially connected with the feedback resistance R of three parallel connections 47, R 48And R 49Range switch S is used to regulate the sensitivity of enlargement ratio or the output voltage of operational amplifier IC.
With reference to Figure 17, temperature measuring circuit constitutes the PN junction diode D that thermometric is used by two high input differential amplifier circuits 6Pass through resistance R 56Power supply, diode D 6With resistance R 56Public termination high input impedance amplifier IC 4-1Positive input, simultaneously by R 57, R 58And R 59The voltage divider of forming takes out a bucking voltage and is added to high input impedance amplifier IC 4-2Positive input, high input impedance amplifier IC 4-1Output terminal through transmitting resistance R 54Meet high input impedance amplifier IC 4-2Reverse input end, by high input impedance amplifier IC 4-1And IC 4-2The output terminal of the two high input differential amplifier circuit that constitutes is via R 60And R 61The voltage divider of forming meets display circuit D.R among the figure 53And R 55Be respectively high input impedance amplifier IC 4-1And IC 4-2Feedback resistance.
The utility model compared with prior art has following advantage:
1) can be used for measuring colored, muddy or with the soil liquid of particle in suspension or water sample Quick-acting ammoniacal nitrogen, nitrate nitrogen, potassium, or the full nitrogen of treated soil sample, full phosphorus and full potassium;
2) this instrument is provided with fibre-optical probe, can directly drop into the soil liquid or water determination, and is easy and simple to handle fast Prompt;
3) measurement range is wide, to the measurement range of ammoniacal nitrogen is: 10-2～10 -6Mol/l (minimum Detection is limited to 0.014ppm), to the measurement range of nitrate nitrogen be; 10-1～5×10 -6Mol/l (minimum detection is limited to 0.07ppm) to the measurement range of potassium is: 10-1～10 -5Mol/l (minimum detection Be limited to 0.4ppm);
4) can be used to measure soil pH and soil salt: the pH index is 0-14pH, ± 0.1pH; Salinity (electricity Lead index) be 0～2 * 104us/cm。

Claims (10)

1, a kind of soil fertility analyzer, by casing, combined type monolithic integrated circuit and sensor are formed, offer the data presentation window on the panel of described casing, be provided with the positioning key and the aligning key of interlocking-type project choice key and respective item simultaneously, it is characterized in that including in the sensor nitrate radical electrode of measuring nitrate nitrogen in the soil, measure the potassium electrode of potassium in the soil, measure the ammonia gas-sensing electrode of nitrogen in the soil, measure the pH electrode of soil acidity or alkalinity, measure the platinum electrode and the contrast electrode of oxidation-reduction potential in the soil, include display circuit and potential method circuit in the above-mentioned combined type monolithic integrated circuit, this potential method circuit is made of high input impedance change-over circuit and low-resistance DC voltage amplifying circuit, low-resistance DC voltage amplifying circuit is through transmitting the resistance continued access on the high input impedance change-over circuit, display circuit then continued access on the voltage divider that output terminal connected of low-resistance DC voltage amplifying circuit, in the combined type monolithic integrated circuit, also include simultaneously positioning circuit and calibration circuit, positioning circuit is gone into the input end of high input impedance change-over circuit with crossing the contrast electrode termination, calibration circuit then is connected between the output terminal and reverse input end of low-resistance DC voltage amplifying circuit, the high insulation shielding plug of the sensor by separately is plugged on the casing rear panel on the corresponding sensor interface, also is provided with contrast electrode interface and supply hub on the rear panel of casing simultaneously.
2, according to the soil fertility analyzer of claim 1 regulation, it is characterized in that described high input impedance change-over circuit is that direct-coupled DC converting circuit or ac modulation change-over circuit add rectification circuit.
3, soil fertility analyzer according to claim 1 or 2 regulations, it is characterized in that in sensor, also having a fibre-optical probe of measuring phosphorus in the soil, while also corresponding photoelectric switching circuit that has additional in the combined type monolithic integrated circuit, this photoelectric switching circuit is made of photoelectric commutator and impedance transformation and amplifying circuit, photoelectric commutator inserts the input end of impedance transformation and amplifying circuit by divider resistance, the output termination display circuit of impedance transformation and amplifying circuit, also be provided with simultaneously on the rear panel of casing and survey phosphorus with fibre-optical probe interface and zeroing turn-knob, fibre-optical probe is plugged on the fibre-optical probe interface on the casing rear panel by oneself plug.
4, soil fertility analyzer according to claim 3 regulation, it is characterized in that in sensor, also having a conductance electrode of measuring salt content in the soil, while also corresponding conductance method circuit that has additional in the combined type monolithic integrated circuit, this conductance method circuit is by the fixed ampllitude oscillatory circuit, impedance transformation amplifying circuit and linear rectification circuit constitute, the output terminal of fixed ampllitude oscillatory circuit is connected to an end of conductance cell by transmission resistance and follower, the input end of another termination impedance transformation amplifying circuit of conductance cell, and the output terminal of impedance transformation amplifying circuit is connected to the input end of linear rectification circuit through coupling capacitance, the output terminal of linear rectification circuit connects display circuit by voltage divider, also be provided with conductance electrode interface and range switch on the rear panel of casing simultaneously, conductance electrode is plugged on behind the casing by oneself plug and on the conductance electrode interface on the plate.
5, soil fertility analyzer according to claim 4 regulation, it is characterized in that in sensor, also having a dissolved oxygen electrode of measuring dissolved oxygen DO in the soil liquid, while also corresponding voltammetry circuit that has additional in the combined type monolithic integrated circuit, this voltammetry circuit is made up of polarizing voltage generation circuit and operational amplification circuit, polarizing voltage generation circuit connects the anode of dissolved oxygen electrode, the negative electrode of dissolved oxygen electrode connects the positive input of operational amplification circuit, the output terminal of operational amplification circuit connects display circuit through voltage divider, simultaneously between the output terminal of operational amplification circuit and its positive input, be serially connected with variable resistor, also be provided with the dissolved oxygen probe interface on the rear panel of casing simultaneously, dissolved oxygen probe is plugged on the dissolved oxygen probe interface on the casing rear panel by oneself plug.
6, the soil fertility analyzer of stipulating according to claim 5, it is characterized in that in sensor, also having a temp probe of measuring the soil moisture, while also corresponding temperature measuring circuit that has additional in the combined type monolithic integrated circuit, also be provided with the temp probe interface on the rear panel of casing simultaneously, temp probe is plugged on the temp probe interface on the casing rear panel by oneself plug.
7, the soil fertility analyzer of stipulating according to claim 3, it is characterized in that between the simulation of combined type monolithic integrated circuit ground and actual the earth, setting up a capacitor, this capacitor should be the non-polarized capacitor of a number microfarad, and the insulation resistance of this capacitor should be greater than 10 10Ohm.
8, according to claim 4, the 5 or 6 soil fertility analyzers of stipulating, it is characterized in that between the simulation of combined type monolithic integrated circuit ground and actual the earth, setting up a capacitor, this capacitor should be the non-polarized capacitor of a number microfarad, and the insulation resistance of this capacitor should be greater than 10 10Ohm.
9, according to the soil fertility analyzer of claim 3 regulation, it is characterized in that being connected to a both-end high input impedance amplifier at the output position of conductance method circuit.
10, according to the soil fertility analyzer of claim 4,5 or 6 regulations, it is characterized in that being connected to a both-end high input impedance amplifier at the output position of conductance method circuit.
CN 97236400 1997-06-24 1997-06-24 Soil crop-producing-power detector Expired - Fee Related CN2295219Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 97236400 CN2295219Y (en) 1997-06-24 1997-06-24 Soil crop-producing-power detector

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Application Number Priority Date Filing Date Title
CN 97236400 CN2295219Y (en) 1997-06-24 1997-06-24 Soil crop-producing-power detector

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CN2295219Y true CN2295219Y (en) 1998-10-21

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CN 97236400 Expired - Fee Related CN2295219Y (en) 1997-06-24 1997-06-24 Soil crop-producing-power detector

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106990145A (en) * 2017-04-11 2017-07-28 北京农业智能装备技术研究中心 A kind of portable soil available nutrient detection means

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106990145A (en) * 2017-04-11 2017-07-28 北京农业智能装备技术研究中心 A kind of portable soil available nutrient detection means

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