|Table of Contents|

Variable Rate Control and Fertilization System of Liquid Fertilizer Applicator Based on Electronic Control Unit(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2019年01期
Page:
111-117
Research Field:
Publishing date:

Info

Title:
Variable Rate Control and Fertilization System of Liquid Fertilizer Applicator Based on Electronic Control Unit
Author(s):
ZHANG Ji-cheng1;  MENG Fan-feng1;  ZHENG Ping1;  HOU Shou-yin2;  JI Wen-yi2
(1.College of Electrical and Information, Northeast Agricultural University, Harbin 150030, China; 2.Engineering College, Northeast Agricultural University, Harbin 150030, China)
Keywords:
Liquid fertilizer;  Control and fertilization system;  Electronic control unit;  Variable rate fertilization
PACS:
-
DOI:
10.11861/j.issn.1000-9841.2019.01.0111
Abstract:
Fertilization is an important process of agricultural production, which directly affects the yield of crops, and reasonable and effective use of chemical fertilizer can not only improve the yield of crops, but also reduce water and soil contamination. At present, the mechanization level of fertilization according to needs is very low in China, and the utilization rate of fertilizer has to be raised up. Variable rate fertilization (VRF) for crop is an effective way to outperform uniform rate fertilization (URF). A control and fertilization system of fertilizer applicator based on electronic control unit (ECU) was designed and experimented in this paper. It included ECU as the control system, signal collection system and fertilization system. ECU used the Raspberry Pi microcomputer to improve the response and steady performance of system. BeiDou/GPS dual-mode point positioning module was applied in the system to insure the positioning and velocity measurement of applicator and query accuracy of prescription map. ECU was responsible for collecting the signals of theoretical fertilization data from prescription map, the applicator speed, the input rate of fertilization measured and operation state data, and for generating fertilization instructions for fertilization system. The fertilization mechanism adjusted the openness of the pressure valve to response these instructions from ECU. This work flow fulfilled VRF based on the agronomic requirements and quantitatively. The experiment data showed that the control and fertilization system based on ECU could provide a reasonable and real-time control of every component. It generally took no more than 7 s from system open to steady flow. The fertilization precision were more than 97.3% both in experimental bench test and field test. The mean difference of flow rate of every fertilization sprayer was low that benefited from liquid separating and sharing device. The control and fertilization system was feasible and can meet the requirement of variable fertilization precision, and it was suitable for agricultural production in current agricultural production, and provided a means for agricultural precision production and reducing fertilization while increasing efficiency in agriculture in our country.

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Last Update: 2019-01-22