The hottest variable input technology VRT and inte

2022-07-31
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Variable rate technology VRT (variable rate technology) refers to a technology that automatically adjusts the input rate of certain agricultural materials in the material box according to the position of the cultivated land where the agricultural machines and tools installed with computers, DGPS and other advanced equipment are located. The VRT system can be applied to a variety of different substances, such as small granular or liquid fertilizers, pesticides, seeds, irrigation water, or chemicals mixed with up to 10 kinds of chemicals. Variable input system usually mainly includes mobile work tools, controllers to adjust the actual logistics rate, positioning system and the ideal material application description diagram of the corresponding cultivated land. On traditional machines and tools, the operator usually controls the input rate of materials by observing the dashboard. On the machines and tools integrated with GPS and GIS, this input rate can be automatically changed with the movement of the machines and tools

intelligent agricultural implements

the purpose of "precision agriculture" technology is to scientifically manage field plots, reduce investment and improve production efficiency. As the agricultural machinery equipment supporting the "precision agriculture" technology, in addition to the combine harvester with positioning system and yield measurement, the agricultural machinery operating according to the prescription map also includes: the grain precision seeder with positioning system and prescription map reading equipment that may cause the loss of test scheme and data after reinstallation, and the grain precision seeder that controls the sowing depth and amount; Fertilizer applicator for controlling the amount of fertilizer; Dose controlled sprayer; Sprinkler irrigation machine for controlling water spray amount, etc

1. Combine harvester

for example, mf40 combine harvester of messey Ferguson company in Britain adopts DGPS system with dynamic positioning accuracy better than 5m, and its grain flow sensor is γ Ray type, with measurement accuracy of ± 0.5%, the software system is the "field star" developed by the company for odor testing of VDA 270, and the operation monitoring system is Datavision II. In the harvest project, the AgGPS132 parallel navigation option can be adopted for accurate navigation. The output is the output distribution map

2. Variable rate fertilizer applicator

according to the different requirements of the field, apply different formulas and different amounts of mixed fertilizers. The specific work is as follows: the ratio of fertilizer required by each plot in the field and the application amount per unit area have been programmed and stored in the computer in advance; Obtain the current position information of the field; Control the amount of sowing and fertilization

3. Variable spraying machine

adjust the dosage and droplet size according to the prescription map and DGPS positioning. For example, when driving the tractor to spray pesticides in the field, the monitor installed in the cab displays the spray prescription map and the location of the tractor. While the driver monitors the walking track, the data processor automatically sends commands to the sprayer to control the spraying according to the spraying amount on the prescription chart

4. Variable irrigation machine

is controlled by master-slave microprocessor, with arm length of 392m. It can adjust the spraying flow at any time to meet the different water requirements of different soil texture, plough layer depth, terrain and yield potential in each community

5. Variable seeder

according to the different actual needs of the plot (fertility, soil moisture and soil quality differences), the seeding amount and depth are adjusted at any time during the seeding operation, hoping to achieve the purpose of neat and robust emergence of the whole farmland

in a word, the intelligent machinery is easy to use. It can automatically identify the agricultural machines and tools attached to the tractor, automatically activate the relevant stored programs and the data Zener guide communication, and automatically give the input rate (fertilizer, agricultural medicine, etc.) that is compatible with the driving speed and meets the requirements of economy and environmental protection. The input rate can be adjusted manually, and can be changed by 10% each time. Users can input data according to the prompts, and display text and graphics clearly and easily. The common monitoring items of various agricultural machinery include: input (kg or L), operating area (M2), driving distance (km), tractor operating time (H), agricultural machinery operating time (H), driver operating time (H), average productivity (m2/h), power take-off shaft speed (RPM), unit time input (kg/min or l/min)

precision agriculture system integration is one of the key technologies to achieve the overall goal of the project. It refers to the coordination, synthesis and overall optimization of various components of the system. It is the overall integration of hardware system and software system. At the same time, it is also an important part of the overall design of the project. The system integration is divided into two steps. First, the computer control system and the "intelligent agricultural machinery system" are integrated respectively, and then the total integration of the above two systems is realized. The computer control system includes "precision agriculture GPS system", "farmland information collection system", "Farmland Geographic Information System" and "crop management expert system". The implementation contents of the two steps of total system integration are as follows, so the cost is significantly reduced by 50%:

1. The integration of precision agriculture computer control system includes the spatial positioning of soil information and yield information, the coupling of GIS and crop expert system to generate spatial positioning farming prescriptions, and the accumulation of soil and yield information and the updating of farming prescriptions

2. The integration of intelligent agricultural machinery system includes the matching, performance price optimization and intelligence of agricultural machinery suitable for wheat and corn farming, sowing, spraying, irrigation, harvesting, etc

3. The integration of the above two systems includes the interface between the soil and yield information collector carried by agricultural machinery and GPS and GIS, and the positioning and real-time control of agricultural machinery operation by farming prescriptions

example of precision agriculture system integration: RDS model

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