71 results about "Soil solution" patented technology

The invention provides an agricultural environment monitoring method and system based on the Internet of Things. According to the method, multi-source data weights are dynamically distributed through a soil sensor array connected with Internet of Things nodes, and a global soil parameter set is generated; deploying a micro-electro-mechanical micro-fluidic chip in the coverage area to carry out soil solution selective permeation, converting the target ion concentration into an electric signal, and synchronously transmitting the electric signal and soil parameters; historical time series data are extracted, coherence is established through time correlation analysis, and undeployed area data are filled in combination with a spatial interpolation algorithm to construct a dynamic prediction model; according to the nutrient space change trend output by the model, crop growth requirements are matched to generate a fertilization amount adjustment instruction, and the fertilization amount adjustment instruction is issued to field fertilization equipment through the Internet of Things to execute dynamic regulation. Space-time precise sensing of soil nutrients and self-adaptive fertilization regulation and control are realized, and the utilization efficiency of agricultural resources and crop growth sustainability are improved.

The invention discloses a method for predicting the irrigation amount of crops in an arid saline-alkali soil area and related equipment. The method comprises the steps that the potential evapotranspiration of a target crop is calculated through a double-source evapotranspiration mechanism model based on key meteorological parameters, obtained through prediction, of a target area, and the leaf area index and the plant height are dynamically updated according to the accumulated temperature process; respectively constructing different stress inhibition functions aiming at the attention salt ions and the pH value in the saline-alkali soil solution, and applying composite inhibition at the stomatal conductance and / or the apparent evapotranspiration resistance site to correct the potential evapotranspiration so as to obtain the ideal crop evapotranspiration corrected by the salinity and the pH value; and based on the corrected ideal crop evapotranspiration, predicting day-by-day irrigation amount and water distribution schedule suggestions in a future preset period. The method can solve the problem that current crop irrigation of saline-alkali soil in an arid inland region depends on experience, influences on different salt types and contents are caused, and quantitative analysis is lacked.

The invention discloses a soil fertility detection device for plum planting, and provides a soil fertility detection device for plum planting, the soil fertility detection device for plum planting comprises a soil fertility detector, a probe tube is fixedly arranged at the bottom of the soil fertility detector, the interior of the probe tube is of a hollow structure, and a main probe is sleeved with the probe tube; a connecting wire connected with a soil fertility detector is fixedly arranged at the top end of the main probe; two positioning assemblies for positioning the main probe are symmetrically arranged at the bottom of the probe tube, and each positioning assembly comprises a fixed plate fixedly arranged at the bottom of the probe tube, a screw threaded in the fixed plate, and a clamping plate which rotates at one end of the screw and is in contact with the outer side of the probe tube. By means of the structure, the main probe makes contact with a soil solution of a target root system layer by stretching the extension length of the main probe, the problem that a traditional probe is not suitable for detection of different depths due to the fixed length is solved according to the main distribution depths of root systems of different tree ages, and the probe is especially suitable for mountainous orchards and other scenes with large root system depth variation and is high in practicability.

The invention discloses a self-adaptive drip irrigation control system and method fused with a soil solution optimal model, and belongs to the field of agricultural irrigation. The system integrates a layered soil and soil solution monitoring module, a weather and crop growth monitoring module, a data acquisition and management module, an irrigation and fertilization execution module and an operation feedback module. Through deep-buried multi-layer soil sensing and solution collection, real-time monitoring of key parameters such as moisture and nutrients of different soil layers is achieved, and a dynamic target is set in combination with crop growth requirements and meteorological data. The system adopts a soil solution optimal model, performs dynamic balance analysis on monitoring data and target parameters, introduces a multi-factor linkage and layered regulation strategy, intelligently generates an optimal water and fertilizer scheme and accurately executes the optimal water and fertilizer scheme. Automatic recording and quality feedback are achieved in the whole process, model self-learning and scheme optimization are supported, the crop nutrient utilization rate is increased, resource waste is reduced, and efficient and intelligent precision agricultural water and fertilizer management is achieved.

The invention discloses a method for evaluating and strengthening interface characteristics of a copper-based composite material, and relates to the technical field of copper-based composite materials. A soil solution and carbon quantum dots are prepared, and the carbon quantum dots are added into the soil solution; the method comprises the following steps: simulating a corrosion process of copper-based composite materials with different aluminum contents in soil solutions with different carbon quantum dot contents, and carrying out polarization curve and electrochemical impedance spectroscopy analysis on the corroded copper-based composite materials by adopting an electrochemical workstation to obtain charge transfer resistance and impedance modulus values of the copper alloy composite materials; meanwhile, SEM, EDS and three-dimensional surface contour analysis are combined, and the surface morphology and roughness of the copper-based composite material are obtained; according to the method, the electrochemical method and the corrosion surface characterization method are combined, the change of the surface and interface characteristics of the copper-based composite material corresponding to different matching materials can be rapidly evaluated, so that the purpose of protecting the alloy material is achieved, and aluminum and carbon quantum dots are found to be capable of synergistically promoting the protection of the copper-based composite material.

The invention discloses a soil column test device and method for plant root zone micro-ecology simulation research. The soil column test device comprises a soil column test model module and a solution collection module. The soil column experimental model module comprises a soil filling container with an upper cover and a lower cover, a plant root simulation device, a simulated root exudate sampling device, a soil oxidation-reduction potential monitoring device and a gas collection device, and the solution collection module is used for collecting liquid in the simulation process. According to the device, the plant root simulating device, the root exudate simulating and sampling device, the soil oxidation-reduction state monitoring device and the gas and soil solution collecting device are integrated, so that comprehensive simulation and monitoring of multiple factors of a plant root zone are realized. The device is low in processing cost, convenient to use and easy to operate, all parts are detachable and reusable, multiple pieces of environmental parameter information can be obtained, and the device has important significance on plant root zone micro-ecology research.

According to the carbonate mineralizing bacteria and the application thereof, firstly, the bacteria C7-12 with the best cadmium removal effect are screened out from the carbonate mineralizing bacteria separated from lead-zinc mining area polluted soil and are preserved in Guangdong Microbial Culture Collection Center (GDMCC) at present, and the preservation number is GDMCC 65568. The carbonate mineralizing bacteria provided by the invention have strong Cd resistance, and the Cd removal rate of 1mg / L Cd solution can reach 85% after the carbonate mineralizing bacteria are cultured for 48 hours under the conditions that the pH is 6, the temperature is 30 DEG C and the urea concentration is 20g / L; the bacterial strain can simultaneously reduce the concentrations of Cu < 2 + >, Pb < 2 + >, Zn < 2 + > and Cd < 2 + > in a soil solution, the removal rates are 33-65% (Cd), 28-32% (Pb), 22-49% (Zn) and 38-44% (Cu) respectively, the heavy metal contaminated soil solution is repaired, and the carbonate mineralized bacteria provided by the invention have the advantages of no secondary pollution, obvious repair effect and easiness in operation, and have wide application prospects in the aspect of soil heavy metal pollution repair.

This invention relates to the field of soil environmental monitoring technology, and in particular discloses a sampling device for simultaneously collecting in-situ soil solutions and gases. The device comprises a support frame unit, a sampling device installed within the support frame unit, a drive device installed on the support frame unit, and a controller for controlling the drive device and the sampling device. The sampling device includes an aperture opener for drilling, a collector for simultaneously collecting soil solutions and gases from the drilled hole, and a gas-liquid separation unit for separating the collected solutions and gases. This device is a complete sampling system that not only reduces equipment costs and improves sampling efficiency, but also ensures the correlation and accuracy of synchronous, in-situ sampling data. By simultaneously, in-situ, and isolatedly collecting soil solutions and soil gases from the same borehole and at the same depth, it avoids cross-contamination and atmospheric interference, significantly improving sampling efficiency and data comparability, and providing a reliable technical means for research on multi-media soil environments.

The invention relates to the technical field of soil environment monitoring, and particularly discloses a sampling device for synchronously collecting solution and gas in in-situ soil, which is provided with a support frame unit, a sampling device arranged in the support frame unit, a driving device arranged on the support frame unit and a controller for controlling and connecting the driving device and the sampling device. The sampling device comprises a tapper used for tapping, a collector used for simultaneously collecting a soil solution and gas from the tapped hole and a gas-liquid separation unit used for separating the collected solution and gas, and the device is a set of sampling system, so that the equipment cost is reduced, the sampling efficiency is improved, and the sampling time is shortened. The relevance and accuracy of synchronous and in-situ sampling data are ensured; through synchronous, in-situ and isolated collection of the soil solution and the soil gas in the same drill hole and the same depth, cross contamination and atmospheric interference are avoided, the sampling efficiency and the data comparability are remarkably improved, and a reliable technical means is provided for soil multi-medium environment research.

The application belongs to the technical field of saline-alkali soil improvement, and discloses a method for improving saline-alkali soil by using organic acid pretreated straw decomposition liquid. The application uses a mixed organic acid solution combined with fresh soil solution to pretreat straw, breaks the dense crystalline structure of straw fiber, increases the adhesion capacity of straw to salt ions, and the prepared soluble straw decomposition liquid can increase the activity of soil colloid, promote the release of adsorbed salt ions in the soil, improve the migration capacity of salt ions, and realize efficient removal of salt ions. The prepared pretreated straw material and decomposition liquid are environmentally friendly, non-toxic and harmless, and can be applied to saline-alkali soil improvement, promote the dissolution and infiltration of salt ions in saline-alkali soil, and prevent the surface aggregation of salt ions in the soil surface. The method has the characteristics of low cost, simple operation and obvious effect.

The present invention relates to the technical field of soil analysis and detection, and specifically discloses a detection system and a detection method for the analysis of potassium sulfate in soil, including a dilution tank and a detection unit for soil analysis. The detection system further includes: a telescopic stirring mechanism disposed in the dilution tank, which includes an upper stirring mechanism and a lower stirring mechanism, and the upper stirring mechanism and the lower stirring mechanism are connected by a spring; a pressure filtration mechanism for pressure-filtering the diluted soil solution and collecting the filtrate; it includes a collection tank, the top of the collection tank extends outward to form a pressure filtration plate, and the collection tank is connected to the upper stirring mechanism; a rotary telescopic assembly for driving the pressure filtration mechanism to rotate and vertically displace; when performing downward displacement, the pressure filtration mechanism filters and collects the filtrate and can squeeze and filter the filtered soil. The present invention can reduce the residual amount of potassium element in the solid after solid-liquid separation, thereby reducing the measurement error of potassium element in the filtrate, and does not require pouring and transferring the mixed solution.

The utility model relates to the technical field of soil mechanical composition detection, in particular to a multi-station soil mechanical composition stirring and liquid absorbing full-automatic integrated device, which is characterized in that when the device is used, different soil particles are respectively placed in a plurality of groups of measuring cylinders; the stirring and liquid absorbing assembly is matched with the moving assembly to stir the soil solution in the second group of measuring cylinders and absorb the soil solution in the first group of measuring cylinders at the same time; after the stirring and liquid suction assembly stirs the soil solution in the second group of measuring cylinders, the soil solution adsorbed in the first group of measuring cylinders is dropped into the vessel assembly under the cooperation of the moving assembly, sampling is completed, high efficiency and convenience are achieved, and the liquid suction amount error is reduced; comprising a working table, a first supporting frame, a moving assembly and measuring cylinders, the first supporting frame is arranged at the top end of the working table, the moving assembly is arranged on the first supporting frame, multiple sets of measuring cylinders are placed at the top end of the working table, and the stirring and liquid absorbing assembly is arranged on the moving assembly.

The present invention relates to the field of geological survey technology, and in particular to a soil solution sampling device for forestry exploration. The device comprises a drilling frame, the drilling frame being composed of a drill rod, a plurality of connecting members and a cone block, the drill rod being fixedly connected to the cone block by the plurality of connecting members, a control module being provided on the top of the drilling frame, a sliding rod being rotatably and slidably connected inside the drilling frame, a fixed cylinder being fixedly connected to the sliding rod, a sampling cylinder being slidably connected inside the fixed cylinder, a driving module being provided inside the fixed cylinder, a plurality of sampling holes being provided in the sampling cylinder, and a positioning assembly being provided on the drilling frame. The present invention vertically drills holes in the soil layer through the drilling frame, and then the fixed cylinder penetrates into the soil layer from the side to complete the sampling of the soil solution, thereby reducing the probability of the solution in the upper soil layer flowing downward due to gravity and mixing with the soil solution in the sampled soil layer, thereby improving the accuracy of soil layer solution sampling.

The application belongs to the technical field of microorganisms, discloses a strain of Desmodesmus arsenicoxydans with arsenic oxidation function and application thereof in soil remediation, and specifically discloses a strain of Desmodesmus arsenicoxydans B3. The application separates a strain of microalgae B3 with arsenic oxidation function, the strain belongs to the genus Desmodesmus and can oxidize As(III) under day-night alternation conditions. Arsenic forms in a flooded soil solution are determined by using a liquid chromatography-atomic fluorescence spectrometer. Arsenic form analysis shows that As(III) is oxidized into As(V), the concentration of As(III) and total arsenic in soil pore water is reduced, which indicates that the Desmodesmus arsenicoxydans B3 can effectively oxidize As(III) and remove total arsenic in the soil solution under the condition of flooding, reduce the biological availability of arsenic, and play an important role in remediation of arsenic contaminated soil.

The application provides a soil detection sensor with a measuring needle and a soil layer pollution detection device, and belongs to the technical field of sensors.The soil detection sensor with a measuring needle comprises a measuring needle assembly and a detection device.The measuring needle assembly has a shell, and an inner cavity and an intermediate insulating layer attached to the inner wall of the shell are arranged in the shell.The lower end of the inner cavity is a solution containing space, and the lower end of the shell is used for inserting into soil and is provided with a small pore to allow soil solution to enter the solution containing space.The detection device is arranged in the inner cavity to detect soil.The sensor is of an insertion type, is convenient to use, and has high detection efficiency.

The utility model discloses soil detection dissolving equipment which comprises a shell, a liquid inlet pipe positioned at the upper part of the shell and a liquid outlet pipe positioned at the lower part of the shell, the cover plate is located on the upper portion of a first hole in the upper end of the shell, the motor is fixedly connected to the upper end of the cover plate, the sealing cover is fixedly connected with the output end, stretching into the shell, of the motor, and the first charging barrel is detachably connected with the sealing cover. And a plurality of second holes are uniformly formed in the peripheral wall of the first charging barrel. The device disclosed by the utility model has the advantages that a certain amount of soil to be detected is placed in the cylinder, the first charging barrel and the sealing cover are sealed through the bolt, and the sealing gasket is arranged between the sealing cover and the first charging barrel. The sealing ring is arranged between the sealing cover and the cylinder, so that the sealing performance is effectively ensured; the motor drives the sealing cover and the first charging barrel to rotate, so that the stirring rod rotates to fully dissolve soil in the cylinder, and the cylinder can also separate insoluble stones from a soil solution.

The present invention provides an intelligent proportioning preparation method for a saline-alkali soil conditioner, which relates to the field of soil conditioners. 15-25 parts of desulfurized gypsum are taken and added into 3-8 parts of sodium alginate colloid, and 2-5 parts of Bacillus subtilis and 2-3 parts of lactic acid bacteria are taken and added into the colloid; 20-30 parts of humic acid, 5-10 parts of sodium lignosulfonate, and 5-10 parts of ferrous sulfate are stirred to form a mixed raw material; the mixed colloid is sprayed into the mixed raw material, and finally dried and granulated to form conditioner particles. In order to solve the problem of uneven proportioning of sodium alginate, by clarifying the optimal cross-linking ratio of calcium ions in sodium alginate and desulfurized gypsum, the air permeability and water retention of the soil are enhanced, and it maintains high activity in saline-alkali soil. The soil can adsorb salt ions and reduce the salt concentration in the soil solution.

The utility model discloses a soiling solution tank and scrubber, the soiling solution tank is used for the scrubber and comprises a water tank shell, a dirt suction pipe fitting and an anti-backflow piece, the water tank shell is provided with a containing cavity used for collecting soiling solution, an airflow outlet is formed in the top of the water tank shell, at least part of the dirt suction pipe fitting is located in the containing cavity, the dirt suction pipe fitting is provided with a dirt suction port and a dirt outlet, and the anti-backflow piece is connected with the dirt suction port. The sewage outlet is located in the containing cavity and located below the airflow outlet, the containing cavity communicates with the sewage outlet and the airflow outlet, and the backflow preventing piece is located in the containing cavity and used for opening and closing the sewage outlet. According to the dirty liquid box, the backflow preventing piece used for opening and closing the dirty outlet is arranged, so that when the floor washing machine stops working, for example, the floor washing machine inclines, and particularly the floor washing machine lies flat, the backflow preventing piece can close the dirty outlet; therefore, dirty liquid is effectively prevented from flowing back into the floor brush from the dirt outlet through the dirt suction pipe fitting to pollute the floor brush and even the ground.

The invention relates to a microfluidic nutrient measurement sensor system for the direct automated measurement of nutrients from soil solution, comprising a sensor box having at least one sensor; an energy supply; a controller; a soil solution extraction unit having a first pump; reservoirs for storing solutions; and a second pump, and is characterised in that the sensor is designed as a chip having microfluidics, the energy supply is designed having an internal current source, and the soil solution extraction unit is designed having a first pump and a suction head made of a porous ceramic. The invention additionally relates to a method for the direct automated measurement of nutrients from soil solution in a sensor system, and to a microfluidic nutrient measurement sensor system assembly.

The invention discloses a soil solution nitrate nitrogen dynamic prediction method based on sensor data flow, and belongs to the field of soil nitrate nitrogen prediction.The method comprises the following steps that samples are collected to construct original data, and the original data are processed to obtain processed data; and constructing a soil solution nitrate nitrogen prediction model based on the multivariable time sequence data, and inputting the processed data into the soil solution nitrate nitrogen prediction model to realize dynamic monitoring and prediction of the nitrate nitrogen concentration of the soil solution. According to the method, the sensor data flow is combined with the machine learning model, and an important breakthrough is made in the field of time sequence prediction. The combination not only reduces the cost of long-term positioning monitoring, but also improves the efficiency of data acquisition, so that the data excavation potential of agricultural basic long-term work is further exerted.

The present invention relates to the field of soil seepage collection, and specifically discloses a field portable combined quantitative soil seepage collection device, comprising: a seepage collection mechanism, including a soil leaching column assembly, and a seepage collection bottle assembly disposed at the bottom of the soil leaching column assembly; the soil leaching column assembly includes a soil leaching column body, and a seepage liquid conduit is fixedly connected to the lower end of the soil leaching column body; by providing collection holes in different soil layers, the field portable combined quantitative soil seepage collection device exhibits extremely high flexibility and adaptability. It can flexibly adjust the drilling distance of the soil solution collection holes according to specific conditions such as land use types and tillage layer thicknesses to ensure the accuracy and pertinence of monitoring. At the same time, the device can also be adjusted accordingly according to the characteristics of different soil types and land types, so as to realize long-term and effective monitoring of soil seepage.

The application discloses a crop irrigation amount prediction method in arid and saline-alkali regions and related equipment. The method comprises the following steps: calculating the potential evapotranspiration of the target crop based on the predicted key meteorological parameters of the target region through a dual-source evapotranspiration mechanism model, and dynamically updating the leaf area index and plant height according to the accumulated temperature process; constructing different stress inhibition functions for the concerned salt ions and the pH value in the soil solution of the saline-alkali soil, respectively, applying a composite inhibition at the stomatal conductance and / or apparent evapotranspiration resistance site to correct the potential evapotranspiration, and obtaining the ideal crop evapotranspiration corrected by the salt and pH value; and predicting the daily irrigation amount and water distribution schedule suggestion within a future preset period based on the corrected ideal crop evapotranspiration. The method can solve the problem that the current crop irrigation in arid inland saline-alkali areas relies on experience and lacks quantitative analysis of the influence caused by different salt types and contents.

The invention provides an ultra-fast soil DNA extraction method and application thereof. The method comprises the following steps: S1, sample pretreatment: taking 50 mg of a soil sample, putting the soil sample in a 200 [mu] L ultrasonic tube, adding 20 mg of a reagent A and 50 [mu] L of Buffer A, carrying out full and uniform vortex mixing, putting the mixture in an ultrasonic instrument, setting the water temperature at 37 DEG C, and carrying out focused ultrasound for 2 minutes; s2, extraction of soil DNA: transferring the pretreated sample into a 2 mL ultrasonic tube, adding 450 [mu] L of Buffer B, carrying out vortex mixing, adding 20 [mu] L of Buffer C, carrying out uniform mixing, placing the mixture in an ultrasonic instrument, setting the water temperature at 37 DEG C, and carrying out focused ultrasound for 2-5 min; s3, purification of the soil DNA: after the ultrasonic treatment is finished, taking out the ultrasonic tube, transferring all the solution subjected to the ultrasonic treatment into a 2mL centrifugal tube, and centrifuging for 5-10 minutes at the temperature of 4 DEG C and 12000g to obtain supernate, namely a soil DNA solution. The soil DNA extraction method disclosed by the invention is short in time, low in cost, simple in operation steps, suitable for various types of soil samples, and very suitable for popularization, and the whole experiment process does not exceed 30 minutes.

The invention relates to the technical field of soil heavy metal removal, in particular to a method for efficiently removing soil heavy metal based on a magnetic removal technology and application. The invention provides an innovative method for combining soil heavy metal activation and magnetic removal technologies. By applying one of the activating agents EDDS, RLs and CaCl2, insoluble heavy metals in the soil can be converted into soluble heavy metals and transferred into a soil solution, the content of the heavy metals in the soil solution is remarkably increased, and then the heavy metals are efficiently removed through the adsorption effect of the magnetic material on the heavy metals. According to the method, through the pre-activation step, the problem that a traditional magnetic removal technology depends on the form of the heavy metal is solved, and the utilization efficiency of a magnetic material and the overall removal efficiency of the heavy metal are remarkably improved. The method has important practical application value and popularization prospect for rapidly repairing the heavy metal polluted farmland and guaranteeing the safety of the cultivated land and sustainable production of grains.

The application discloses a kind of triaxial sample preparation device and method based on underwater deposition method, including saturator, support, water base, vacuum pump and three membrane mechanism, saturator is used for the container of underwater sand soil vacuum saturation, saturator top cover is equipped with the pipeline of connecting pressure tube, and is equipped with first valve to control on-off, pressure tube other end is connected with vacuum pump.Saturator below is equipped with the pipeline of connecting rubber tube, and is equipped with second valve to control on-off.The three membrane mechanism is the mold of triaxial sample, and water base is installed on top.Saturator is fixed on the three membrane mechanism and water base by support.The device simplifies the process of preparing triaxial sample of conventional underwater deposition method, eliminates sample heating, injects airless water, overnight cooling, sand soil solution is transferred between flask and funnel and other processes, greatly shorten the time of sample preparation, reduce test operation threshold, improve test reliability.

The present disclosure relates to the field of a soil analysis apparatus. The apparatus comprises an enclosure, a provision for introducing a soil solution to be analyse, reservoir, a plurality of storage containers to store reagent solution, a frame member having a plurality of apertures to support a plurality of dispensing pipes, at least one pump coupled to a control unit and in fluid communication with the storage containers and the reservoir to dispense a predetermined quantity of the reagent and the soil solution into a receptacle. Further, at least one robotic arm assembly coupled with a control unit, traverses within the enclosure to receive the soil solution and reagents solution and to perform a mixing operation to obtain a mixture of soil solution and reagent solution. Further, an image capturing unit is present to capture images of the mixture to analyse the soil properties and nutrient content.

The invention relates to a sodium chloride salinized soil unfrozen water model based on a multi-cation phase change mechanism, which comprises the following steps: S1, collecting a NaCl salinized soil sample, and measuring the specific surface area of the soil; s2, preparing a soil saturated leaching solution, and determining the solution concentration of the saturated leaching solution by using an ion chromatograph or a conductivity method; multiplying the solution concentration of the saturated leaching solution by 5 to obtain the soil solution concentration; s3, the required temperature is determined; s4, substituting the measured soil solution concentration into a parameter expression in the salinized soil unfrozen water model, and calculating key parameters, namely a salinized soil freezing point, a salinized soil freezing point reduction coefficient and values of fitting parameters of five different soils; and S5, establishing an unfrozen water content model, and calculating the unfrozen water content of the saline soil. According to the method, calculation is convenient, the number of input parameters is small, the result of the parameterized model is matched with the actually-measured unfrozen water content, and the unfrozen water content under different concentrations can be accurately calculated.

The application discloses a banana precise fertilization method based on nitrate nitrogen concentration in soil solution, and specific steps are as follows: collecting soil solution, immediately determining the concentration of nitrate nitrogen in the soil solution on site by ion meter, or carrying out cold storage treatment, and determining the concentration of nitrate nitrogen in the laboratory; comparing the determined concentration of nitrate nitrogen with the range of the concentration of nitrate nitrogen in the soil solution suitable for banana growth; and determining a fertilization scheme according to the comparison result. The application determines the content of nitrate nitrogen in the soil solution, takes the nitrogen level in the soil solution as a reference index for banana nitrogen fertilizer application, accurately judges the nitrogen level of banana plants, and precisely adjusts fertilization, so that the problems of large workload, serious lag and poor precision of the traditional fertilization method are solved. The application also accurately gives the range of the concentration of nitrate nitrogen in the soil solution suitable for banana growth, i.e. 70-280 mg / L ‑1 , which provides a clear basis for banana nitrogen fertilizer application.

The invention provides a probe type soil detection sensor and a soil layer pollution detection device, and belongs to the technical field of sensors. Comprising a probe assembly and a detection device, the probe assembly is provided with a shell, and an inner cavity and a middle insulating layer attached to the inner wall of the shell are arranged in the shell; the lower end of the inner cavity is a solution containing space, and the lower end of the shell is used for being inserted into soil and provided with tiny holes to allow a soil solution to enter the solution containing space. The detection devices are arranged in the inner cavity and are used for detecting soil; the sensor is in a plug-in type and is convenient to use and high in detection efficiency.