Zhang, Y. and Staab, E.S. and Slaughter, D.C. and Giles, D.K. (2012) Automated weed control in organic row crops using hyperspectral species identification and thermal micro-dosing. Crop Protection, 41. pp. 96-105.
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Abstract
A hyperspectral imaging system was coupled to a precision, pulsed-jet, micro-dosing system to selectively deliver high-temperature, organic, food-grade oil for intra-row weed control in early growth tomatoes. The imaging system, based upon a multispectral Bayesian classifier, successfully discriminated the species of 95.9%, on average, of plant canopy for tomato, Solanum nigrum L. and Amaranthus retroflexus L. using canopy reflectance in the 384–810 nm range. Food-grade oil, heated to approximately 160 °C, was applied to weeds using a pressurized micro-dosing pulsed-jet. The target application rate was approximately 0.85 mg/cm2 in 10-ms-pulsed doses while traveling at a ground speed of 0.04 m/s. In an outdoor test, approximately 95.8% of S. nigrum and 93.8% of A. retroflexus were controlled 15 days post thermal treatment, while only 2.4% of the tomato plants received significant damage. Application coverage assessments of leaf surfaces immediately after the heated oil application found that tomato viability was retained if 50% or less of the leaf surface was inadvertently dosed, while 100% mortality was achieved for S. nigrum and A. retroflexus if more than 90% of their respective leaf surfaces were covered with heated oil.
| Item Type: | Article |
|---|---|
| Additional Information: | Micro-spray; Machine vision; Plant discrimination; Heated oil; Precision agriculture; Tomatoes |
| Uncontrolled Keywords: | Micro-spray; Machine vision; Plant discrimination; Heated oil; Precision agriculture; Tomatoes |
| Author Affiliation: | Department of Biological and Agricultural Engineering, University of California, One Shields Avenue, Davis, CA 95616, United States |
| Subjects: | Plant Protection Crop Improvement |
| Divisions: | Other Crops |
| Depositing User: | Mr. SanatKumar Behera |
| Date Deposited: | 28 Aug 2012 04:07 |
| Last Modified: | 28 Aug 2012 04:08 |
| Official URL: | http://dx.doi.org/10.1016/j.cropro.2012.05.007 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/7538 |
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