Xiaojun Qiao

The Design of Wireless Sensor Networks Node for Measuring the Greenhouse's Environment Parameters

Wireless sensor networks are integrated of sensor techniques, embedded system techniques, distributed computation techniques and wireless communication techniques. It’s a hot research area in the world. It will be widely used in agriculture. This paper introduces the hardware and software design of wireless sensor networks node for the measurement of greenhouse environment parameters. These nodes can form networks themselves, measure the environment parameters precisely, transfer data safely, and solve the difficulty of wiring in greenhouse, making the earlier research of wireless sensor networks used in greenhouse

Research and Exploitation of Precise Irrigation-Fertilization Controller

Develops a general structure of a Precise Irrigation-Fertilization Machine. Introduces the designing ideas of the hardware and software structure of Precise Irrigation-Fertilization Controller, which is the hard core of the machine. MSP430F149 is used as the manager and controller of sub-modules of the precise irrigation-fertilization controller, such as time module, memory module, valve control module, EC/PH measurement module and estate detection module, power module and so on. The paper particularly introduces the schematic diagrams and flow charts of the controller and its main sub-modules. The simulation result shows that the controller designed in the paper can realize the intended function accurately, and come up to the design requirement as well.

Monitoring and analysis of electrical signals in water-stressed plants

Abstract A multi‐channel system was developed for simultaneous monitoring of multiple environmental factors and electrical signals in greenhouse grown cucumber plants. Using this system, electrical signals in response to water stress were recorded in the laboratory and in the greenhouse. Application to the roots of a 30% polyethylene glycol 6000 solution (‐0.84 MPa water potential) caused a significant decrease in the amplitude of an electrical signal induced by a dark/light change. The amplitude of the mean value of the signal in the transition from dark to light (40–50 min at dawn) was used to reflect the status of the plant under water stress, at which time the soil water content was reduced to 27%. The system was able to provide a long‐term stable tool to measure and analyse changes in electrical signals in plants in response to environmental changes.

A THEORY MODEL FOR DESCRIPTION OF THE ELECTRICAL SIGNALS IN PLANT PART I

The ion mechanism for membrane potential of higher plant was discussed in this paper. A modified Hodgkin and Huxley model was developed for description of the electrical signals in plant. Three individual components of ionic current were formulated in terms of Hodgkin and Huxley model. It include potassium current IK, calcium current ICa, and anion current ICl-. It model will provide a useful tool to simulate the electrical activity in cell of higher plants, which respond to environmental changes.

Research of Decision Support System (DSS) for Greenhouse Based on Data Mining

Most of expert knowledge in agriculture is descriptive and experiential, so it is difficult to describe in mathematics and build decision support system (DSS) for greenhouse. Therefore, the decision support system (DSS) for greenhouse constructed of data warehouse and date mining technology was introduced in this paper. In the system, data warehouse was founded to memory diversified date, the using of on-line analytical processing and date mining enriches knowledge base with new agriculture information. Implementation of system adopted SQL Server analysis, as a result, tightness coupling of data warehouse, date mining and application, improved efficiency of date mining. Combined data warehouse with on-line analytical processing and date mining to construct a novel DSS.

REVIEW OF APPLICATION OF MATHEMATICAL MORPHOLOGY IN CROP DISEASE RECOGNITION

Mathematical morphology is a non-linear image processing method with twodimensional convolution operation, including binary morphology, gray-level morphology and color morphology. Erosion, dilation, opening operation and closing operation are the basis of mathematical morphology. Mathematical morphology can be used for edge detection, image segmentation, noise elimination, feature extraction and other image processing problems. It has been widely used in the field of image processing. Based on the current progress, this thesis gives a comprehensive expatiation on the mathematical morphology classification and application of crop disease recognition. In the end, open problems and the further research of mathematical morphology are discussed.

Research of Greenhouse Efficient Automatic Irrigation System Based on Evapotranspiration

Traditional water-saving irrigation management turns on water pump in a settled interval decided by grower’s experience. The method just saves water on the back of losing yield. In order to result the problem, a kind of greenhouse efficient irrigation management system based on Evapotranspiration has been developed. The system includes greenhouse environmental monitoring subsystem, irrigation analysis subsystem, control methods, can instruct users to irrigation greenhouse through quantitative calculating greenhouse crop water requirement. The system has been examined in greenhouses of ShengFangYuan Test Station in Beijing, China; the result shows that the system can instruct greenhouse irrigation efficiently, increase yield 18%, and save water 28%.

The Design of Portable Equipment for Greenhouse's Environment Information Acquirement Based on Voice Service

For settling the problem of acquiring environment parameters quickly and responding in time in greenhouse which has low ability of auto-controlling environment. This paper designed a voice service system which was used in greenhouse for environment information collecting. This equipment can acquire and analyze the parameters of temperature, humidity, illumination, dew point temperature, soil temperature, soil humidity. And it offered alarm and environ- ment controlling suggestion by voice. This equipment achieved data acquiring, storage, displaying and voice service by MCU msp430 and voice chip PM50S100. Expert knowledge which had simple decision logic was embedded in this system. This equipment offered simple voice service based on the collecting data in greenhouse. And it had advantages of convenience operation, low power consumption through the test in greenhouse.

The Design of Smart Wireless Carbon Dioxide Measuring Instrument Used in Greenhouse

Different crops, seasons, greenhouse’s structures and planting area need different concentration of carbon dioxide which fertilized in greenhouse. Measuring the concentration of carbon dioxide accurately in greenhouse is very important to fertilize carbon economically and reasonably Concentration of carbon dioxide measuring equipments were often used in chemical industry and environment fields, these equipments are not suitable for greenhouse’s environment and had many disadvantages such as high price, high power consumption and low anti-interference ability. Based on the research of carbon dioxide measuring equipment, this design took part of Non Dispersive Infrared (NDIR) carbon dioxide sensor produced by GSS, embedded Zigbee module provided by Jennic, smart calibration program and solar panel charge system. The results showed that the accuracy was±30ppm, average power consumption was 2mW, high consistency, response fast. This design can change the present of carbon dioxide measuring instrument hard to popularize, and make carbon dioxide fertilization accurately.

Design of Plant Eco-physiology Monitoring System Based on Embedded Technology

A real time system has been developed to collect plant’s growth information comprehensively. Plant eco-physiological signals can be collected and analyzed effectively. The system adopted embedded technology: wireless sensors network collect the eco-physiological information. Touch screen and ARM microprocessor make the system work independently without PC. The system is versatile and all parameters can be set by the touch screen. Sensors’ intelligent compensation can be realized in this system. Information can be displayed by either graphically or in table mode. The ARM microprocessor provides the interface to connect with the internet, so the system support remote monitoring and controlling. The system has advantages of friendly interface, flexible construction and extension. It’s a good tool for plant’s management.