|Title:||Development and Preliminary Evaluation of a Variable Rate Spraying System||Other Titles:||變率施噴系統之研發與初期評估||Authors:||Jyh-Rong Tsay
|Keywords:||Variable rate spraying;DGPS;Paddy field;Precision farming;變率噴霧;差分全球定位系統;稻田;精準農業||Issue Date:||1-Mar-2003||Publisher:||中華農業機械學會||Journal Volume:||12||Journal Issue:||2||Start page/Pages:||37-48||Source:||農業機械學刊||Abstract:||
A variable rate chemical application system based on prescription maps from an accompanying expert decision system was developed to accommodate in-field spatial variability of paddy fields in Taiwan. A flow-based spraying system using a TASC 6200 console by Mid-Tech®, Inc. was used as the main frame to perform the general automated spraying functions. Preliminary evaluation of the variable rate spraying system was performed by testing Differential Global Positioning Systems (DGPS) receiver static and dynamic signal responses, sprayer flow, and nozzle flow/boom patterns. Main conclusions drawn from this study were stated as follows. With an average static error of approximately 1.6 meters and an average 2-Distance RMS of approximately 2.3 meters, the used RX-400p receiver is accurate enough for navigation, but not sufficient for field work. The trend obtained from dynamic accuracy test does not coincide with that from other researchers. However, the velocity data from the DGPS receiver may be used for providing speed information of the sprayer. The re-verification experiments showed that the tested DGPS receiver moving with a traveling speed varied from 0.2 to 1 m/s behaved almost the same in both longitude and latitude with an average dynamic position error of 2.23 m. The averaged offset time for the tested DGPS receiver moving with a traveling speed varied from 0.4 to 1 m/s was found to be 3.48 seconds. The higher the application rate and traveling speed, the larger the sprayer flow error. Both calibration numbers, 153.1 and 155, with minimal sprayer flow error can be used for calibrating the used flow meter without significant difference. The nozzle flow/boom patterns of four nozzle types with CVs less than 5% were very uniform. The data collected provided valuable information for improving and implementing variable rate application suitable for Taiwan's situations.
|Appears in Collections:||農業工程組|
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