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The Application of Iot Technology in Agriculture.邵清源917106840533 1 IntroductionThe Internet of things is the network of physical devices, vehicles, home appliances and other itemsembedded with electronics, software, sensors, actuators, and connectivity which enables these objects to connect and exchange data. Each thing is uniquely identifiable through its embedded computing system but is able to inter-operate within the existing Internet infrastructure.(from Wikipedia)The application of iot technology in agriculture is the definition of the agricultural Internet of things, which is quite simple to understand. This involves a wide range of aspects of agriculture, including monitoring of agricultural greenhouses, agricultural drip irrigation, freshwater aquaculture water quality monitoring and other aspects. Using a large number of sensors to form an effective monitoring network,which agricultural information feedback is realized through, is necessary. In order to facilitate the timely detection of problems in agricultural production, timely feedback the position of the problem, the agriculture and modern production technology should be combined with, and the application of intelligent and automatic equipment in agricultural production should be realized.the emergence of theagriculture has played an important role in improving agricultural productivity. With the popularity of the Internet of things of agriculture, the traditional inefficient and casual way of agricultural production are also gradually improve, information technology and agricultural development is the inevitable trend of modernization.2 Literature ReviewThe Internet of things technology has great application prospect in agriculture, and it is believed that in the near future, Internet of things technology will be the core technology to assist the development of agricultural technology in China.（Intelligent agricultural design analysis of Internet of things technology，2018/3/21，Sun Hujun). Internet technology can be precisely controlled relative crop growth environment, guarantee the plants grew well, avoid necrosis, especially for growing environment requires higher flowers, can obviously improve the survival rate and quality; It can reduce labor cost and realize scale planting. It can also realize the monitoring and prevention of cordyceps sinensis, the disaster warning, etc. (The application of Internet of things technology in intelligent greenhouse,2015/8/3,Wang Lina).The Internet of things is the third wave after the development of computer and Internet technology. The development of Internet technology to the development of agricultural economy in our country laid a certain foundation, in the application of modern agriculture become more and more widely, can achieve scientific monitoring, planting, to further promote the transformation of modern agricultural development.(The application of Internet of things technology in agriculture,2018/1/16,Dai Lian, Lai yuling).3 HistoryConcept of a network of smart devices was discussed as early as 1982, a modified Coke machine at Carnegie Mellon University became the first Internet-connected appliance. Between 1993 and 1996 several companies proposed solutions likeMicrosoft's at Work or Novell's NEST. However, only in 1999 did the field start gathering momentum. Bill Joy envisioned Device to Device (D2D) communication as part of his "Six Webs" framework, presented at the World Economic Forum at Davos in 1999.The thought-model for future interconnection environment was proposed in 2004.This thought model envisioned the development trend of the Internet of things.4 Potentiality4.1 Full information chain trackingIn recent years, there have been many problems about China's food safety, and people are paying more and more attention to the dangers of food safety. Investigate its reason, the food safety problem is due to the process of agricultural products from production to sales rather than the quality of supervision and management, consumers also did not understand the process, which directly lead to food appear a series of problems. Internet of things technology in the food regulation can play a role in supervision. From food production and processing to transportation and sales, each one links in the real-time tracking and monitoring, to ensure the safety of the agricultural product quality effectively. At present, some places in our country has been applied to the Internet of things technology, such as: chengdu, Qingdao and other regions where restaurant s’ food production and processing and saling, which all are installed electronic chips, to monitor restaurant food safety problems from the production, processing, transportation and sales. Iot technology mainly equip the electronic track scale installation to the farmer's market, then consumers can in a farmers' market buy food at the same time through the phone they can query to the food production, processing, transportation and sales and other related quality information. Such as: to implement “ the Internet of things technology”, “the safety of the food” “RFID” and “GPS”technology which set up during the Olympic Games in Beijing,for the Olympic stadium in catering staff has carried on the tracking and monitoring of food, from the production, processing to sales of each link to tracking and monitoring information. In addition, for the supply of enterprise products supply logistics implementation of GPS real-time positioning in the process of monitoring, including the vehicles, such as temperature, humidity monitoring, once the temperature humidity in excess of the prescribed scope, the administrator will receive monitoring alarm message. In short, the wide application of Internet of things technology has provided a guarantee for the safety of food supply in the agricultural industry.4.2 Intelligent planting and farmingGenerally, the influence factors of planting and breeding are carbon dioxide concentration, air temperature, soil moisture and light. In greenhouse cultivation, breeding, therefore, the use of the Internet of things technology, through real-time monitoring of temperature, humidity, light intensity, PH value and air pressure data, and automatic control fertilization homework, so as to provide a good environment for the growth of crops, also greatly reduce the workload of migrant workers. In addition, the Internet of things not only can monitor the above data, also can analyze the data and processing, and through the sensor nodes send data to a wireless sensor, which can be a large area of data collection, management, analysis and informationprocessing technology, etc. For example, in aquaculture, the quality of the farmers' work is not high if the weather is hot and humid, but the weather affects the growth of the products most. The hot and humid weather will lead to the lack of oxygen in the pond and changes in PH value, and ammonia nitrogen content will also change. And through the use of the Internet of things technology, can 24 hours real-time monitoring of aquaculture water quality situation, including ammonia nitrogen, water PH, temperature and other data, once found that the problem can be through the warning form inform farmers. In addition, farmers can check the temperature, water quality and oxygen content of the pond at any time through Internet and mobile phone terminals, effectively reducing the workload of the farmers. Therefore, the use of Internet of things technology can greatly improve the yield and quality of agricultural products, thus maximizing economic benefits.4.3 Agricultural information pushMany people think that the push of agricultural information mainly refers to the push of weather forecast. But the development of crops now has more to do with weather. Therefore, through the use of the Internet of things technology, the data analysis and processing, and to predict future data changes over a period of time, the farmers can be predicted by these forecast accordingly in advance to prepare, etc., this can be for the growth of crops to reduce unnecessary loss. The amur region, for example, has realized the formula of soil, fertilization data monitoring and analysis, the prediction data and the result was sent to the farmers, provide favorable basis for providing sowing.5 examples about application of IoT in agriculture5.1Application of agricultural iot technology to grape planting.5.1.1The application of agricultural iot technology in improving grape planting environment.In the grape growing area, set up multiple information collector of the Internet, and information collector of grape growth environmental conditions to collect information including grape growing area of temperature, humidity, light conditions, co2 concentration, soil moisture, soil nutrient and so on. Using the Internet to link the information to collect, transmit the information to the terminal through the network management platform. Information collected by computer management center of culture analysis, draw the conclusion: the growth of grape growing environment, and then according to the analysis results will need to deal with matters in the form of the command control cabinet, grapes, irrigation, fertilization, spraying, etc. The Internet of things technology can real-time acquisition, storage, the location of the various soil and environmental parameters, including soil temperature, moisture, air humidity, light. These data directly enter the computer control room, farmers can know the result in time. If the data shows that the humidity is not enough, then the mouse will send commands and automatically start the pump to spray the grapes according to the preset procedure. In addition, mobile video monitoring is installed in the garden, and farmers can see the inside of the plantation at any time if they use a computer or mobile phone at home.5.1.2Application of agricultural Internet of things technology to achieve intelligentgrape irrigation.Apply the agricultural Internet of things technology, introduce the automatic frequency conversion irrigation system, through the Internet of things control box and expert information system, according to the collected information to irrigate the grape precisely. Automatic frequency conversion irrigation system using the frequency conversion technology, can realize the pump automatic start and stop, and it do not need to run for a long time, which can reduce the load of pump. As long as the related parameters set, it can ensure that the pipe water pressure and flow rate to maintain in a reasonable scope, to avoid the damage to pipeline. Reducing the pipeline jam phenomenon happened . Internet of things can get the moisture of the soil through a variety of sensors, when they tested that the soil moisture is less, which will affect the growth of grapes, the sensor will transfer the information to the management center, management center after receiving the information, send instructions will be needed for irrigation area of solenoid valve is opened, automatic watering grapes need irrigation of grapes. After the irrigation to a certain extent, whether to continue the irrigation information system will be judged by experts, information system can be experts knowledge and experience of related plant transformation as the control parameter, sending them to give the control center, provide a reliable basis for judging the current situation.5.2The application of Internet of things technology in soilless culture.5.2.1The perception of environmental conditions of soil without soil.Iot perception layer by all sorts of information and data acquisition and sensor devices, including information collection layer by temperature and humidity sensor, pH sensors, nutrition concentration sensors, cameras and infrared sensors to sense, collect soilless cultivation equipment of environment temperature, humidity, pH, and nutrient concentrations, and the collected data, video, or physical quantities into the physical world of information. Self-organizing sensor network adopting digital link coding, modulation and demodulation technology to realize data transmission between the sensor and the sensor node of the wlan, based on the network, traffic management and routing technology, realize the self organization and coordination between each node. Through the various kinds of sensors installed, the changes of relevant indicators in the soil cultivation facilities are perceived and collected, and the information transmission is carried out through 3G, 4G network technology, wireless network and bluetooth.5.2.2The processing of environmental information of soil without soil.The related index information collected by the sensing layer is transmitted to the network layer through the self-organizing sensor network. Network layer is passed perception send or receive data, through access to physical quantities carry electronic information, identification and information format conversion, and then by the network interface layer perception layer collected information into the application layer,to realize the whole iot structure of three levels of connection.5.2.3The regulation of soil culture environmentAccording to the requirement of the soilless cultivation facilities plants to environmental conditions, set the cultivation in advance environmental indicators,such as temperature, humidity in soilless cultivation facilities, pH, concentration of carbon dioxide, nutrient concentrations, illumination, and cultivation of outdoor climatic conditions and related indicators to monitor, record. Through a variety of sensors and perception layer information acquisition terminal access parameters in time, and then through the network layer transfer and processing, output to the corresponding operation interface, then realize that implementation of soilless cultivation environment related indicators of the real-time monitoring and regulation. In addition, the user according to the requirement of environmental indicators in different periods, set the corresponding warning threshold, network system can be according to the different need of related parameters of plants to the intelligent adjustment5.3The application of iot technology to the quality and safety traceability system of fertilizer.5.3.1The importance of quality and safety of fertilizer production.Short for fertilizer, chemical fertilizer, is made by chemical methods to provide one or more needed to make crops grow in the nutrient fertilizer, nitrogen fertilizer, phosphate fertilizer, potash fertilizer and compound fertilizer, hefei, China is a populous country, and agriculture is very important. Food production in our country agricultural development occupies a pivotal position. Our country's arable land accounts for only 7% of the world's, but China's population22%, therefore, increasing production per unit area of cultivated land is the only way for China's grain production. fertilizer is to improve the soil properties, increase soil fertility, and is the important measures to increase food production. Fertilizer inputs, which is the basis for the most, is closely related to people's healthy diet also, its production quality and safety is very important.5.3.2Chemical fertilizer quality safety traceability system architecture.In chemical fertilizer quality safety traceability system, the hardware layer includes sensors, RFID tag module (to EPC coding of RFID tags, unified distribution and management), read and write, antenna, printer (printing RFID tags and traceability code). Chemical fertilizer quality safety traceability system mainly used in the product information collection and transfer the information to the service layer. Service layer is responsible for data processing and transmission, including rf data with the query, proofreading, storage and management. The data layer is used to store data, including details of products and business. Application layer includes production, storage, transportation, sales and so on each link of the process management, main body involved in the activities of all aspects of the formation of the relevant information, the application layer also provides all kinds of query, regulation and other service functions.5.3.3The realization of quality and safety traceability system of chemical fertilizer.In fertilizer production processing store sales in the link, the operation of the information acquisition process is: when the factory finished fertilizer production work, after inspectors inspection by rf label management functions for all processing fertilizer was distributed with EPC RFID tag encoding information. After Rf reader to the EPC tag information, by the operator for detailed information on school work.When the fertilizer has completed the sales process, the purchaser can check the relevant information of each link in the company's fertilizer quality and safety traceability system through the tracing code on the packaging bag.If the product quality problem is found, the purchaser may report or complain to the relevant quality control department. In this way, the product quality information traceability is realized, and the anti-counterfeiting authentication of chemical fertilizer products and the certification of enterprises' anti-cross products are realized. Traceability links can also record problem product traceability code,when and who buy, contact phone number, thus it is advantageous to the enterprise and the government supervision department in accordance with the relevant information query, to implement supervision and control of products. The fertilizer quality safety traceability system also has a separate management module for data backup and recovery functions to ensure the security of all data in the traceability system.6 The limitations of using the Internet of things in agriculture6.1 higher costAlthough in recent years there has been a massive decline in the cost of the sensor, but the cost is still high. The humidity sensor, soil moisture sensor price is more expensive. The total greenhouse environment parameter sensor price at around $ten thousand. The needs of large investment funds for migrant workers, lead to the application of the Internet of things technology can't realize. It still need to reduce the investment cost.6.2 technical problemsSensor will be measured due to improper installation location, bad stability of inaccurate data. There are some wireless sensor signal transmission distance is limited, and data transmission is not stabl .The maintenance cost is high as well. In addition, using the sensor power supply problem no good solution. if use solar power, power is not enough. If use alternating current (ac) is the most greenhouse without electricity and laying electric power line, which limit the popularization of the internet of thing technology in agriculture.7 conclusionThe Internet of things technology belongs to a kind of new technology, belong to the core of intelligent technology, the typical use of new network technology, however, judging from the actual situation of our country at present stage, the Internet of things technology has not yet formed technology system of the system.Results show that the Internet of things technology has great application prospects in the agriculture, believe in the near future, the Internet of things technology can be a secondary agricultural technology level of the development of the core technology in our country.。