76 results about "Plant density" patented technology

The invention relates to the technical field of crop disease and insect pest monitoring, and particularly provides a crop disease and insect pest intelligent monitoring system based on image recognition and machine learning, and the system comprises a reference model generation subsystem which obtains a continuous state flow in a crop growth period through a multispectral imaging array; performing micro-variation field comparison on the real-time image of the continuous state flow and the ideal form reference vector, and outputting a biological stress difference chart; the mutual exclusion association engine subsystem purifies a pathological response map, inputs the pathological response map into a pathological characteristic dissociation network, and outputs an environmental immune type disease mark set; and the disease source trajectory deduction subsystem diffuses a power chain through organisms on the basis of the initial infection focus coordinates in combination with a real-time wind direction vector field and a plant density topological graph. According to the method, the problem of high false positive rate in a complex farmland scene is solved through a dual denoising mechanism of growth rhythm decoupling and environmental interference stripping; and finally, monitoring dimension jump from single-point identification to group prevention and control is realized.

The invention discloses a fertilization method and system based on a regional land parcel image, and belongs to the technical field of agricultural fertilization, and the method specifically comprises the steps: collecting a target regional land parcel image through an unmanned aerial vehicle, and after radiation correction and geometric correction, extracting fertilization information containing soil color, vegetation coverage, vegetation index and landform characteristics, integrating to form a fertilization feature data set; according to the fertilization feature data set, dividing regions through a decision tree classification algorithm, identifying and visually displaying by means of a geographic information system; collecting crop variety, planting density and regional division result data, making a fertilization scheme of each region in combination with a fertilization model, and applying fertilization by using automatic equipment; images are collected again after fertilization, the crop growth response evaluation effect is monitored, and the fertilization scheme is adjusted as required, so that the agricultural production benefits are effectively improved, the fertilizer waste is reduced, and the scientificity and rationality of fertilization are optimized.

The invention relates to the technical field of agricultural equipment, and discloses an intelligent traditional Chinese medicine field weeding device with a self-adjusting function. Comprising two supporting plates, a transverse driving assembly used for driving the two supporting plates to move reversely in the horizontal direction, a rotating cylinder rotationally connected with the supporting plates, a power assembly used for driving the rotating cylinder to rotate and a plurality of cutting ropes. By arranging the transverse driving assembly capable of driving the two supporting plates to horizontally and reversely move, the distance between the two supporting plates can be flexibly adjusted, so that the traditional Chinese medicine field planting device is matched with the column spacing, changed due to the planting density difference, of different areas of a traditional Chinese medicine field, and the adjusting assembly drives the adjusting rod to ascend and descend so as to drive the sliding disc to ascend and descend; the cutting rope can stretch out or retract into the rotating cylinder, the stretching length of the cutting rope is adjusted, the cutting path of the cutting rope flexibly covers the gap between two rows of traditional Chinese medicine plants, and the problems that the size of a cutter of an existing weeding device is fixed, and the cutting coverage range cannot be flexibly matched with the row spacing are solved.

The invention discloses a northern corn leaf blight early warning method and system based on data analysis, and relates to the technical field of agricultural disease early warning, and the main scheme is as follows: a data acquisition module acquires meteorological data, planting density data, pathogenic bacteria transmission data and physiological status data of corn growth in real time; the method comprises the following steps that: a data analysis module analyzes various data to obtain a meteorological influence coefficient # imgabs0 #, a planting density influence coefficient # imgabs1 #, a pathogenic bacterium propagation rate # imgabs2 # and a physiological state influence coefficient # imgabs3 #, an early warning issuing module calculates a northern leaf blight influence index # imgabs4 # according to the coefficients, whether risk early warning is triggered or not is judged and a protection instruction is generated, and a user interaction module receives early warning data and sends the early warning data to a control module. Early warning information and a data labeling graph are displayed, an early warning analysis report is generated, related personnel are notified through mails, short messages or systems, comprehensive, accurate and timely corn northern leaf blight early warning is achieved, and powerful guarantee is provided for agricultural production.

The invention belongs to the technical field of agricultural intelligent decision support and crop cultivation optimization, and particularly provides a food crop precision cultivation decision method, system and device and a medium, and the method comprises the following steps: obtaining cultivation related data of all sites in a target area; downscaling the meteorological data through a bilinear interpolation method, and merging the meteorological data with the soil data and the management measure data into a grid data set; using a random forest model and a crop growth model to determine a plurality of key variety parameters having the maximum influence on the output and the growth period importance; a random forest model is adopted to construct a mapping relation between the key variety parameters and meteorological data and soil data in the grid data set, and the key variety parameters of each grid in the target area are obtained; and utilizing the random forest model and the crop growth model to obtain the sowing date and the planting density corresponding to the target yield of each grid. According to the method, the precision breakthrough on the decision-making scale is realized, and the simulation effect precision is improved by 20-30%.

The invention belongs to the technical field of intertidal zone ecological restoration, and relates to a scirpus mariqueter corm seedling cultivation method and a muddy coast ecological restoration method, and the method comprises the following steps: accelerating germination of scirpus mariqueter corms; carrying out seedling cultivation by adopting ground seedling cultivation, cup seedling cultivation or vegetation blanket cultivation, and outplanting after reaching outplanting standards to obtain scirpus mariqueter corm seedlings; wherein in the cultivation process, the salinity is controlled to be smaller than or equal to 20% o, and the outplanting standard is that the plant height is controlled to be 10-15 cm; for ground seedling cultivation and cup seedling cultivation, water culture or soil culture is adopted after germination accelerating, corm seedlings are obtained after corms germinate till buds grow to 5 cm or above, and then ground seedling cultivation or cup seedling cultivation is conducted on the corm seedlings; for planting blanket cultivation, the scirpus triqueter corm subjected to germination accelerating treatment is cultivated through a planting blanket, and the outplanting standard further includes that the plant density is larger than or equal to 300 plants / m < 2 >. The scirpus mariqueter corm seedlings can adapt to severe environmental conditions, the survival rate is increased, and the scirpus mariqueter corm seedlings are suitable for ecological restoration of muddy coast.

The invention discloses a garlic harvester automatic row control method and system based on machine vision, and belongs to the field of agricultural machinery automatic control, and the method comprises the steps: employing a deep learning network to generate a plant density distribution diagram based on image data obtained through machine vision; based on the plant density distribution diagram, a density and speed coupling dynamic model is constructed, and the optimal advancing speed of the garlic harvester under the current plant density condition is solved through a nonlinear mapping function and an optimization algorithm; compensating visual perception based on the optimal advancing speed to obtain compensated visual perception information; based on the compensated visual perception information and the optimal advancing speed, constructing a multi-time scale prediction control framework to obtain a control strategy; and based on actual operation data, optimizing a density-speed coupling dynamic model and a control strategy, and realizing automatic row control of the garlic harvester. According to the invention, traditional multiple sets of speed control and path detection strategies are replaced, and the system adaptability is improved while the complexity of the control system is reduced.

The invention relates to the technical field of wetland plant harvesting, in particular to a control method and device of a harvesting robot, electronic equipment and a storage medium. According to the harvesting robot control method provided by the invention, the target cutting position of the harvesting cutter of the harvesting robot is calculated based on the acquisition of the current distance of the harvesting robot relative to the surface of the filler in the modularized wetland; the target cutting speed of the harvesting robot is calculated by combining the type and the density of plants actually filled in the modularized wetland system, and the lifting mechanism and the driving mechanism are synchronously controlled to operate so as to harvest the plants. Thus, through intelligent sensing and cooperative control, precise, efficient and self-adaptive harvesting is achieved, manual intervention is remarkably reduced, the operation quality and the wetland maintenance efficiency are improved, and meanwhile damage to matrixes or plant roots is avoided.

Methods for electroporating plants and electroporation systems are described. The electroporation may be based on one or more of plant species, plant size, plant density, plant health and plant growth. The electroporation may target the basal portion of the plants. The plant characteristics may be sensed by driving electrodes used for electroporation in a sensing phase, preceding the electroporation treatment stage.

The invention relates to the technical field of biological fireproof forests, and discloses a design method for a biological fireproof barrier forest belt, which comprises the following steps of: 1, designing a biological fireproof forest belt based on the canopy density of 0.2-0.5 of a broadleaf mixed forest by taking the existing forest stand type as the broadleaf mixed forest, screening suitable fireproof tree species by integrating site conditions, natural environment and hydrothermal conditions of the biological fireproof forest belt of the broadleaf mixed forest; 2, cleaning and soil preparation are conducted on a biological fireproof forest belt to form a hole belt-shaped area, comprehensive complementary planting is conducted on fireproof tree species, the complementary planting density of a broad-leaf mixed forest is 2520 plants per kilometer as tree planting points, the fireproof tree species are planted in the hole belt-shaped area through the tree planting points, and the fireproof tree species are planted in the hole belt-shaped area; after planting, a compound fertilizer is used for topdressing, so that the fireproof tree seeds absorb fertility to accelerate the growth speed.

A method for improving saline-alkaline soil using Salvia miltiorrhiza combined with biochar, comprising the following steps: S1. Soil preparation: applying harmless treatment organic fertilizer as a base fertilizer, evenly applying biochar according to a proportion, plowing and tilling the soil, and, according to planting density and topographical conditions, planning ridge spacing and ridge width of double high ridges; S2. Salvia miltiorrhiza planting: performing Salvia miltiorrhiza seedling transplantation using a seedling transplantation method and hole planting means, digging holes on ridge surfaces, trimming overly long parts of seedling roots, planting seedlings vertically, and covering with soil; S3. field management after transplanting: performing fertilization, weeding, and top dressing management. The present method for improving saline-alkaline soil using Salvia miltiorrhiza cultivation combined with biochar application reduces soil pH and total salt content, increases soil sucrose enzyme activity, increases soil alkaline phosphatase activity, and alters soil microbiome structure.

This invention relates to a new and distinct variety of strawberry plant named ‘BG-15.490.061’. This new strawberry plant named ‘BG-15.490.061’ is primarily adapted to the growing conditions of the central coast of California, and is primarily characterized by its orange red to red fruit color, medium fruit size, conical fruit shape, with slight differences between primaries and secondaries; fair fruit flavor, with seeds typically held even the surface; medium to large plant size, with medium plant density; medium yellow green foliage color, with slightly concave to flat cross section; and fruiting trusses typically held even to below the plant, with little to no anthocyanins and weak pubescence.

This invention provides a green cultivation method for improving the quality and efficiency of low-value litchi orchards. The method includes collecting data on the existing variety retention status, planting density, canopy overlap rate, canopy shading rate, number of new shoots per tree, and proportion of diseased and insect-infested branches in the orchard to be renovated. Based on these indicators, the low-value type and renovation intensity level are determined. Renovation paths are matched according to variety renewal, canopy closure renovation, or mixed renovation types, using methods such as top grafting, thinning and pruning, or a combination of both. The planting density after thinning, pruning height, number of grafted branches per tree, and number of new shoots per tree are determined based on the renovation intensity level. After the grafted branches survive or the second batch of new shoots turns green, the number of shoots is counted, and re-grafting, re-pruning, or topdressing to promote shoot growth are performed based on the statistical results. This invention enables the renovation of low-value orchards to shift from experience-based processing to a continuous management approach combining classification, grading, and feedback correction.

To develop a cultivation technique that enables provision of mulberry leaves sufficiently reducing the content of calcium oxalate monohydrate crystals which are associated with food poisoning concerns, from the perspective of provision of safe and reliable food; and to enable complete yellowing of mulberry leaves and enhance the content of a flavonoid pigment.SOLUTION: Since mulberry is a C3 plant and its photosynthetic activity is particularly susceptible to photoinhibition, light receiving posture, such as a leaf angle, has a significant impact on the photosynthetic capacity of the plant community. Therefore, establishment of a cultivation environment (e.g., pruning, planting density) that account for leaf blade inclination angle, regulation of a photosynthetic amount through appropriate shading control, and use reduction of lime to an upper limit for soil management, are actively examined.SELECTED DRAWING: Figure 1, Figure 6

The present invention discloses a garden video acquisition and processing method and system with intelligent perception and dynamic tracking, relating to the garden field. Specifically, the method includes collecting multiple sets of plant and animal density maps, the abnormal behavior and movement paths of historical intrusion objects, and the abnormal behavior and movement paths of current intrusion objects, training a historical intrusion training model; obtaining a predicted movement path of the current intrusion object in the garden video to be tested, and activating a corresponding warning device; determining whether the movement path of each current intrusion object deviates; and, if deviated, tracking the abnormal behavior and real-time movement trajectory of the current intrusion object in real time; collecting multiple sets of abnormal behavior changes and real-time movement trajectory changes of the current intrusion objects, training a real-time intrusion training model, obtaining a predicted trajectory of the intrusion object to be tested, and adjusting the warning device. The present invention can effectively improve the intelligence level and response speed of garden environment monitoring.

The utility model provides a plant hydroponic device with adjustable planting density, which is characterized by comprising a box body, support plates are fixedly arranged on the box body, and the box body is divided into a plurality of hydroponic spaces by the support plates; a plant fixing device is arranged on the supporting plate and composed of two fixers, the fixers are transversely arranged on the supporting plate in a sliding mode, a belt wheel is transversely arranged in the middle of the fixers, a belt is arranged on the belt wheel, one end of the belt is fixedly connected to one side of the supporting plate, and the other end of the belt is connected with the fixers. Rubber strips are arranged at the ends, close to the water culture space, of the fixing devices, and the two fixing devices are correspondingly arranged. The laboratory hydroponic device is used for improving the efficiency and density controllability of laboratory hydroponic, the hydroponic volume is set according to experimental requirements, and experimental operations such as plant material taking, material observation, planting density control and simultaneous cultivation of different types of plants are facilitated.

The utility model discloses an ecological system for deep purification of tail water of a sewage plant, which comprises a wetland purification unit, a vegetable purification unit and a symbiotic ecological unit, the wetland purification unit is arranged on the upstream of the vegetable purification unit, and the symbiotic ecological unit is arranged in the vegetable purification unit. According to the characteristics of water area, water environment conditions and the like, the wetland purification unit, the vegetable purification unit and the symbiotic ecological unit are constructed, the three units promote each other in the water treatment process, ecological treatment, tail water resource utilization and system stability improvement are achieved, and the purification efficiency of the system is kept for a long time; the planting range, the planting density and the planting mode of the aquatic vegetables are comprehensively planned, meanwhile, according to hydrodynamic conditions, combined with the impact resistance of the system, emergent aquatic plants are increased for water body slow flow in a large water body flow rate or large area, the survival rate and growth vigor of the aquatic vegetables can be effectively increased, and the space utilization rate is increased by reasonably arranging the vegetables and the plants, so that the ecological environment is improved. The purification capability of the system is enhanced.

A device for controlling a distance and / or a height of an attachment above the ground and / or above a plant surface. The attachment is attached to an agricultural vehicle. The device includes a scanner, an evaluation unit, and a control unit. The scanner detects a plurality of detections, detects a detection area, the detection area being is narrower in the direction of travel than transverse to the direction of travel, and detects objects via the plurality of detections and to record data on a detected angle, a detected distance to an object, and / or a density of the object or the objects. The evaluation unit reproduces a ground profile and / or the plant surface and / or a location-dependent plant density as evaluation data. The control unit processes the evaluation data into control commands and controls the distance and / or the height of the attachment to a target value.

Methods for electroporating plants and electroporation systems are described. The electroporation may be based on one or more of plant species, plant size, plant density, plant health and plant growth. The electroporation may target the basal portion of the plants. The plant characteristics may be sensed by driving electrodes used for electroporation in a sensing phase, preceding the electroporation treatment stage.

The application provides a kind of ginseng growth monitoring method and system based on image recognition, related to ginseng growth monitoring technical field, the core step of the application includes dividing ginseng planting area into multiple grids, and collecting relevant environmental data through environmental sensor, using convolutional neural network to build growth monitoring model to obtain ginseng growth data, further analyze model output to obtain health index.The method can quickly identify the growth condition and potential disease of ginseng through accurate growth data analysis.The application not only provides a more comprehensive growth monitoring means, but also calculates the comprehensive growth index by comprehensively analyzing the health index, environmental data and planting density to realize the comprehensive and scientific evaluation of ginseng growth status.Through this method, the grower can timely make scientific decisions and optimize management measures to ultimately promote the yield and quality improvement of ginseng.

The invention relates to the technical field of garden irrigation, in particular to a novel garden water conservancy irrigation device and method.The novel garden water conservancy irrigation device comprises a shell, a first rotating shaft is rotationally connected to the inner side wall of the shell, one end of the first rotating shaft penetrates through the shell, and a rotating disc is fixedly connected to the top of the first rotating shaft. Through accurate angle and range adjustment, water flow can be directionally sprayed to a target plant area, water resource waste caused by flood irrigation of a traditional device is avoided, and full-angle coverage of an irrigation area is achieved; compared with a traditional fixed spray head, the horizontal coverage range is enlarged by 3-5 times, the coverage density can be adjusted according to the plant density through the rotating speed controllable design, breakthrough is achieved in irrigation flexibility, uniformity, integration, energy conservation and environmental protection, and the device can be widely applied to various garden water conservancy scenes such as urban parks, residential districts, botanical gardens and irrigation and water conservancy. And the method has remarkable practical value and popularization prospect.

The utility model discloses an auxiliary device for crop field seeding. The auxiliary device comprises a marking rod, a node ring, an inserting rod and a telescopic rod, the marking rod is sleeved with a plurality of node rings; inserting rods are arranged at the lower ends of the node rings; the middle of the inserting rod is rotationally connected with a telescopic rod; a plurality of limiting holes are formed in the top of the marking rod in an array mode, limiting grooves are symmetrically formed in the two sides and slidably connected with node rings, and pipe clamps are symmetrically arranged at the two ends; the telescopic sleeve is arranged at the top of the joint ring; the pipe clamp is arranged on one side of the joint ring; the inserting rod is rotationally connected to the bottom of the joint ring; a hole is formed in the middle of the telescopic sleeve and movably connected with a limiting rod; the plant spacing can be accurately determined according to different crop types and planting densities; therefore, the seed sowing position is uniform, and the problem of non-uniform seed density in a traditional sowing mode is avoided.

The invention discloses a multi-crop line spacing identification and wheat and corn interplanting sowing width regulation and control method, relates to the technical field of interplanting sowing width regulation and control, and aims to solve the problems that the rationality of corn planting density is reduced, and the risk of group structure imbalance is increased. Generating a corn sowing channel, detecting the gradient to calculate the soil body flatness characteristic, detecting the soil body penetration resistance of the channel, evaluating the sowing level by combining the flatness characteristic, and collecting wheat growth data; the method comprises the following steps: calling a corn variety planting density reference, calculating a crop interference coefficient by utilizing wheat growth data, analyzing a target seeding density of a channel in combination with the planting density reference, evaluating the advancing speed of a seeding machine by utilizing a soil body seeding level, generating a seeding amplitude characteristic value in combination with the target seeding density, and regulating and controlling the seeding machine to complete interplanting based on the characteristic value. Differentiated sowing width regulation and control aiming at different soil conditions and wheat growth states are realized, and the group structure coordination of interplanting field parcels is improved.

The present invention relates to the technical field of crop disease and insect pest monitoring, and in particular provides an intelligent crop disease and insect pest monitoring system based on image recognition and machine learning. The system comprises: a benchmark model generation subsystem for acquiring a continuous state stream within the crop growth cycle through a multispectral imaging array; a micro-field comparison of the real-time image of the continuous state stream with an ideal morphological benchmark vector, outputting a biological stress difference map; a mutually exclusive association engine subsystem for purifying the pathological response map, inputting it into a pathological feature dissociation network, and outputting a set of environmental immune disease markers; and a pathogen source trajectory deduction subsystem for analyzing the initial infection focus coordinates, combined with a real-time wind direction vector field and a plant density topology map, through a biological diffusion dynamic chain. The present invention solves the problem of high false positive rates in complex farmland scenarios through a dual denoising mechanism of growth rhythm decoupling and environmental interference stripping, ultimately achieving a leap in monitoring dimensions from single-point identification to group prevention and control.

The application provides an intelligent pesticide spraying vehicle with a dynamic profiling pesticide application function, comprising a vehicle frame, guide wheels and drive wheels, and foldable side wings are hinged to the two sides of the vehicle frame; through the foldable side wing design with a projection overlap rate of greater than or equal to 85%, the transportation width is reduced to 52% of that of a traditional device, the bottleneck of passing through a narrow orchard path (less than or equal to 1.5 m) is broken, multivariate collaborative control is realized, the speed is automatically reduced and the amount is increased in a high-density area, the height is adjusted in real time in a crown layer mutation area, liquid pesticide splashing is avoided, the utilization rate of liquid pesticide is increased by 40%, the guide rail mobile sprayer realizes dynamic matching of the plant density D of the transverse position L, and the boundary missing spraying problem of a traditional fixed spray rod is eliminated.

The invention relates to a plant spacing setting method, system and device of a rice transplanter and a medium, and the method comprises the steps: obtaining meteorological prediction data, a water demand interval of a growth cycle of a to-be-planted crop in a preset time period, soil humidity, terrain elevation data and historical environment data of each sampling region, and a historical crop remote sensing index of the crop under the historical environment data; calculating an environmental influence coefficient of each sampling area; determining a moisture convergence path network of the target planting area; determining a soil humidity change sequence of each sampling area in a preset time period according to the meteorological prediction data and the moisture convergence path network; performing numerical value superposition on the soil humidity change values in the soil humidity change sequence and the corresponding soil humidity to obtain a soil humidity sequence; and calculating a water stress risk value of the growth cycle, and determining the planting distance of each sampling area. The rationality of the planting density is improved by setting the plant spacing of the rice transplanter.

This invention belongs to the field of maize planting technology, and discloses a high-yield maize planting method based on a combination of density and fertilization, comprising the following steps: S1, planting maize using a wide-narrow row planting method; S2, planting maize in wide rows... 2 Calculate the planting spacing for wide-narrow row planting method using formula s. 1 =(1 / ax) 1 )*666.7, calculate the original corn planting spacing x 1 , will x 1 and y 2 Substitute the value into x 2 y 2 / 2=x 1 Given a / 2, calculate the planting spacing x when using the wide-narrow row planting method. 2 S3. Based on the narrow row y in step S1 1 、wide line y 2 Plant spacing x 2 Plant corn; S4, apply base fertilizer and top-dress with nitrogen fertilizer. This invention can ensure that the space occupied by individual corn plants remains unchanged by adjusting the spacing between wide and narrow rows, thus overcoming the technical bottleneck of increasing plant density without reducing yield, realizing the logic and formula of plant spacing optimization, and thereby achieving an overall yield increase.

The application provides a vibrating comb brush type seed harvesting system of a shrub seed, determines a basic vibration amplitude of a vibrating unit in a seed harvester based on a plant density per unit area in a scanning area and a main branch diameter of a main branch of a shrub canopy; when a real-time torque value of a comb brush driving motor in the seed harvester exceeds a preset load threshold value, proportionally adjusts a current vibration frequency in the vibrating unit according to the real-time torque value, simultaneously reversely compensates the current vibration frequency in the vibrating unit according to a current working speed of the comb brush driving motor, and further determines a target vibration frequency of the comb brush driving motor in the seed harvester; generates a control instruction of the seed harvester based on the target vibration frequency and the basic vibration amplitude, drives an eccentric shaft servo driver in the seed harvester, and makes the vibration frequency and the vibration amplitude of the vibrating unit work cooperatively. Based on the above scheme, the vibration amplitude and the vibration frequency in the vibrating unit of the seed harvester can be cooperatively regulated.

The invention relates to the technical field of farming equipment, and discloses a soybean wide and narrow ridge staggered type double-grain seeder which comprises a rack with a suspension bracket, the rotary tillage assembly is used for rotationally crushing soil and straw, the shaping plate is used for extruding, shaping and ridging crushed soil, the pressing assembly is used for compacting ridge surfaces, the seeding assembly is provided with two circles of staggered duckbilled seeding ports, and the shallow burying assembly can be used for laying and shallowly burying drip irrigation belts. According to the staggered type double-grain seeder on the soybean wide and narrow ridges, through the integrated design of rotary tillage crushing, shaping and ridging, pressing and compacting, staggered seeding and drip irrigation tape laying, the defects of a traditional seeder in the aspects of straw treatment, soil adaptability, seeding precision, water and fertilizer field management and the like are comprehensively overcome; organic unification of soil physical and chemical property improvement, planting density optimization and field environment regulation and control is achieved, and reliable equipment technical support is provided for high and stable yield of soybeans in the north of Anhui province.

The application discloses an underwater plant density automatic measuring mechanism and method, and belongs to the field of plant density measurement. The measuring mechanism comprises a depth finder, a depth adjusting rod, a scanning device, a measuring ship and a central processing unit. The depth finder is installed on the measuring ship and is used for measuring the water depth of plants in real time. The depth adjusting rod is used for automatically adjusting the length according to the measured water depth, so as to ensure the best measuring position. The scanning device is located at the end of the depth adjusting rod and comprises multiple measuring groups. Each measuring group comprises a transmitting module and a receiving module. The transmitting module is used for transmitting red light, and the receiving module is used for receiving the red light by a CCD device. The central processing unit is used for judging whether the light intensity attenuation time is caused by plants, impurities in water or branches of plants. The number of underwater plants is counted by moving the measuring ship along the cross section of a river. The application has the advantages of high automation degree, small error, multiple applicable objects and the like, and truly realizes large-range and high-precision underwater plant density measurement.