Research Of Precision Control Fertilization System Design And Accomplishment

This study integrated application of information technology,electromechanical integration control,system integration,nutrition diagnosis,and field trials comparing technology thought and method,to design irrigation precision control fertilization device which can realize irrigation fertilizer accurate control,overall fertilizer injection well-distributed,fertilizer injection time can be controlled,and using the information technology,developed the drip irrigation precise fertilization control system,including locale and remote control function.This paper through the analysis of the existing equipment,finally designed the fertigation device that can meet the needs of the current drip fertigation,and accomplished automatic control.Through the device control system monitoring,capacity analysis and fertilization pattern research,completed from the device design idea to the field actual operation of each work.And formed the following results:1.According to the problems of fertigation links put forward the design idea and principle of drip irrigation precise control fertilizing device,and analyzed the fertilizer characteristics of existing device,keep its advantage and improve defect.We put forward the research design of preparation mechanism aim at the fertilizer rate accurately controlled;And we put forward the research design of quantitative repeated small injection mechanism aim at injection evenness.Completed the design and assemblage of the drip fertigation precise control device.Meanwhile,To carry out the test of definition and uniformity distribution fertilizer.Certification the superior application performance of this device.2.We developed irrigation fertilization device control and remote control system based on the PLC and put forward the drip irrigation precise control fertilization system field control technology solutions and remote control technology.Field control adopted the text display to show the equipment operation parameters,and by manual to input application link parameters to control precision fertilization.Meantime we designed and researched the stepper motor and linear motor drive mode.Through programming and software development,finally accomplish the automation control.3.Used independent research and development drip irrigation precise control of fertilizer equipment as the research object,through the best nitrogen application at different development stages,single irrigation time and irrigation area of drip irrigation cotton based on SPAD nutrition diagnosis,we researched the single fertilization time of precise fertilization devices with different specification fat dish,confirmed preparation ability under different irrigation conditions and different growth period of drip irrigation precise fertilization device.Finally it provided theoretical basis for the improvement of fertilizer distribution system agencies and optimization of parameters.Through the research of the design of the device and driving equipment selection study,this study completed the drip precise control fertilizing device independent research and development.Through the irrigation fertilization device control and remote control system based on the PLC accomplish automation precise fertilization,fertigation quantitative control,automation and fertilization time control,significantly improved the injection evenness of fertigation link.Based on the research of the fertilizer ability,we determined the best nitrogen fertilizer rate of cotton ChengLei period,flowering and blooming period are: 63.03 kg/hm~2,64.19 kg/hm~2,60.09 kg/hm~2,62.84 kg/hm~2,providing theoretical basis of variable rate fertilization at different development stages of drip irrigation cotton.And through the research it showed that there is no relation between nitrogen application rate per unit time and head flow qd,but relate to water yield Q and nitrogen application Nd of particular cotton growth period.Finally we acquire the drip irrigation improvement project of precise control fertilization equipment.Through fertilization effect contrast test between independent research and development fertilization equipment and the traditional differential fertilizing device of drip irrigation cotton,based on cotton yields,proved the best fertilization period of the different growth period of cotton according to irrigation precision control system.