Design And Research Of Main-path Water-fertilizer Integrated Fertilizer Applicato

With the ongoing development of modern agriculture in China,water resources are becoming increasingly scarce.Traditional irrigation and fertilization practices in agriculture lead to the wastage of water resources and soil pollution.The integration of water and fertilizer technology is a new and efficient agricultural approach that aims to facilitate watersaving irrigation and rational fertilization.This innovative technology offers an effective solution to the outdated irrigation and fertilization practices in China,which have resulted in the waste of resources in agricultural production.This study focuses on the design of a mainline water and fertilizer integration fertilization machine that takes into account the requirements of facility agriculture production and equipment performance indicators,and explores the structure and control systems of the machine.The main objectives of this paper are:(1)To analyze the functional requirements of the fertilizer machine and design a suitable scheme.By analyzing the current research situation on water and fertilizer integration equipment both domestically and internationally,and by considering the real needs of water and fertilizer supply to facility agriculture production in China,this study determines the mainline water and fertilizer integration irrigation and fertilization mode,irrigation amount,fertilizer absorption amount,channel number,and other performance indicators,and develops an overall scheme for the fertilization machine accordingly.(2)To design and develop the water and fertilizer integration control system.Based on the actual working needs of the irrigation and fertilization system,this study designs the software workflow and hardware structure of the system.The control program and interface are designed based on the workflow,and sensors,industrial control touch screens,and other major hardware elements are selected to achieve the precise control of the fertilization process parameters.The PLC serves as the core controller to enable effective control of the system.(3)Design and Simulation Analysis of Fertilizer Machine System Structure and Mixed Fertilizer Suction.The fertilizer machine’s structure is designed and modeled in 3D according to the overall plan,and the mixed fertilizer suction system’s fluid characteristics are analyzed using Computational Fluid Dynamics(CFD)methods.A finite element analysis model is established,and the Flo EFD simulation software comprehensively analyzes the differences in the amount of mixed fertilizer sucked by different branch pipe diameters.Ultimately,the optimal branch pipe diameter for the fertilizer machine is determined to be32 mm,corresponding to a single channel suction amount ≥ 775.80L/h,which meets the functional requirements of the machine.(4)Precision Control Strategy of Fertilizer Concentration.To enhance the precision of fertilizer concentration control during the irrigation process,a fuzzy PID control system for liquid fertilizer EC and p H value is developed using MATLAB.This system solves problems such as poor uniformity of fertilizer irrigation due to changes in main pipe pressure,main pipe flow,and fertilizer tank liquid level in the water-fertilizer integration system and low accuracy of fertilizer concentration.The control algorithm is simulated,and results demonstrate that the steady-state time of liquid fertilizer EC and p H value control is approximately 52.6% and 10.9% less,respectively,than with the PID controller.(5)Construction and Performance Test Analysis of a Prototype Main-road Waterfertilizer Integration Fertilizer Machine.The stability test of the entire machine,maximum fertilization test,and EC and p H value control test are designed and conducted.Through the test study,the results demonstrate that the main-road water-fertilizer integration fertilizer machine satisfies the design requirements.This article focuses on research on the main-road water-fertilizer integration fertilizer machine,optimizing its structure and control system.The results effectively address issues such as single functionality of water-fertilizer integration equipment in water-fertilizer control,poor fertilization accuracy,and insufficient equipment stability.The developed main-road water-fertilizer integration fertilizer machine has advanced technology and great potential for promotion and application in China’s facility agriculture development,playing a critical role in the industry’s advancement.