Determination of weeds in agrophytocenosis in site-specific agriculture
Repsons, J.(Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Dept. of Soil Management)E-mail:[email protected]
A study has been conducted in cooperation with the University of Bonn. The weed determination and weed control system based on digital photo analysis, GPS and GIS, usable for various farms under the conditions of Latvia, is being worked out. Significant reduction in pesticide usage and environmental preservation have been reached via site specific, selective herbicide application. Digital image analysis is used to identify weed seedlings of the most typical vegetation in cereal sowings in Latvia. The weed species identification is needed to select post emergence herbicides and to assess weed seedlings distribution in the fields. The reduction of herbicide treatments can be realized by selective herbicide application, when weed control is limited to field areas where specific weeds are present. Images were captured in near-to-infrared light with a digital camera. The images were processed with the computer - binarized, weeds contours were extracted, and shapes - analyzed (including parameters of the external contour such as roundness, compactness, area, and 40 Fourier descriptors). The investigations were carried out in cereal sowings in Latvia.
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