Evaluation of a variable rate controller for aldicarb application around buffer zones in citrus groves
| dc.contributor.author | Tumbo, S. D. | |
| dc.contributor.author | Miller, W. M. | |
| dc.contributor.author | Salyani, M. | |
| dc.contributor.author | Sweeb, R. | |
| dc.contributor.author | Buchanon, S. | |
| dc.date.accessioned | 2017-06-23T04:31:05Z | |
| dc.date.available | 2017-06-23T04:31:05Z | |
| dc.date.issued | 2007-01-25 | |
| dc.description | Computers and Electronics in Agriculture, 2007; 56:147–160 | en_US |
| dc.description.abstract | Advances in precision farming technologies have facilitated controlled application of agrochemicals and documentation procedures to follow environmental regulations. This paper details evaluation of a commercial variable rate (VR) controller for preventing aldicarb applications in the buffer zones around potablewater wells of citrus groves. The controllerwas coupled to two common drive mechanisms, a ground-driven electric clutch-engaged (GDEC) and pulse-width-modulation motor-driven (PWMM). The evaluation involved determination of dynamic performance of the VR application system through quantification of reaction times and rate transition distances and determination of appropriate “look-ahead” times for each of the drive mechanisms. Without a look-ahead (zero) setting, the mean midpoint reaction distances were about 1.8 and 3.6m for the GDEC and PWMM mechanisms, respectively, at 7.0-km/h ground speed. For the GDEC, a look-ahead time of 1 s gave the mean midpoint reaction distances of −0.06 and 0.04m during step-up and step-down of the rate, respectively. For PWMM, the best look-ahead times were 1 and 2 s during step-up and step-down of the rate, respectively.However, since the prototype unit could not accommodate two look-ahead times, the compromise look-ahead time for both step-up and -down was 2 s. Validation in the actual buffer zone showed that, at 95% confidence level, the buffer zone should be increased by 2.5 or 3.3m in commercial applications using GDEC or PWMM systems, respectively. | en_US |
| dc.identifier.issn | 0168-1699 | |
| dc.identifier.uri | https://www.suaire.sua.ac.tz/handle/123456789/1666 | |
| dc.language.iso | en | en_US |
| dc.subject | Granular applicator | en_US |
| dc.subject | Variable rate application | en_US |
| dc.subject | Controller | en_US |
| dc.subject | Prescription map | en_US |
| dc.title | Evaluation of a variable rate controller for aldicarb application around buffer zones in citrus groves | en_US |
| dc.type | Article | en_US |