Automated weed control in organic row crops using hyperspectral species identification and thermal micro-dosing
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- 作者：Yun Zhang ; yunzhang@ucdavis.edu ; Erik S. Staab ; David C. Slaughter ; D. Ken Giles ; Daniel Downey
- 关键词：Micro-spray ; Machine vision ; Plant discrimination ; Heated oil ; Precision agriculture ; Tomatoes
- 刊名：Crop Protection
- 出版年：2012
- 出版时间：November, 2012
- 年：2012
- 卷：41
- 期：Complete
- 页码：96-105
- 全文大小：1246 K
文摘
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?¡ãC, 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.