Precision farming for weed management: techniques

Abstract

Site-specific weed control techniques have gained interest in the precision farming community over the last years. Managing weeds on a subfield level requires measuring the varying density of weeds within a field. Decision models aid in the selection and adjustment of the treatments, depending on the weed infestation. The weed control can be done either with herbicides or mechanically. A site-specific herbicide application technology can save large amounts of herbicides. Mechanical weed control techniques adapting to the weed situation in the field are applicable to a wide spectrum of crops.Site-specific techniques for the detection and management of weeds are presented. A system for the discrimination of different weed species and crops from images is described, which generates weed maps automatically. Models for the yield effect of weeds are developed and applied in onfarm-research experimental setups. Economic weed thresholds are derived and used for a herbicide application with a patch sprayer.

Discrimination of herbicide-resistant kochia with hyperspectral imaging

“…This is a site-specific weed control technique 13 designed not only to locate weeds among crop fields, but to also determine the appropriate herbicide(s) to use on each individual plant. The process involves a detailed spectral analysis of different kochia plants in different crops (e.g., wheat, barley, and sugar beet), aimed at differentiating between the herbicide-resistant and susceptible biotypes of the weed.…”

Comparative classification analysis of post-harvest growth detection from terrestrial LiDAR point clouds in precision agriculture

“…For example, the German law ( §12 f. IV PflSchG, BMJV, 2012) prescribes the use of economic weed thresholds based on plants per square meter at which control is economically justified. Such thresholds provide valuable decision aids for weed control, indicating at which weed density pesticides need to be applied (Weis et al, 2008). However, these thresholds discount the nature of weeds growing in patches (Lamb and Brown, 2001).…”

“…Detection and control of post-harvest growth (weed and second growth) are important fields of precision agriculture (PA) (Weis et al, 2008). In most crops, post-harvest growth negatively influences yields because of the additional competition for nutrients, water, and light, or due to insects and diseases settling down within post-harvest growth (Zimdahl, 2013).…”

Sensorik für einen präzisierten Pflanzenschutz

“…Zur teilschlagspezifischen Unkrautbekämpfung sind erste Verfahren bis zur Praxisreife entwickelt worden (vergl. Weis et al 2008). Dabei werden die makroskopisch sichtbaren Unkräuter mittels digitaler Verarbeitung multispektraler Bilder (RGB bzw.…”