Real-time image processing for crop/weed discrimination in maize fields

This paper presents a computer vision system that successfully discriminates between weed patches and crop rows under uncontrolled lighting in real-time. The system consists of two independent subsystems, a fast image processing delivering results in real-time (Fast Image Processing, FIP), and a slower and more accurate processing (Robust Crop Row Detection, RCRD) that is used to correct the first subsystem's mistakes. This combination produces a system that achieves very good results under a wide variety of conditions. Tested on several maize videos taken of different fields and during different years, the system successfully detects an average of 95% of weeds and 80% of crops under different illumination, soil humidity and weed/crop growth conditions. Moreover, the system has been shown to produce acceptable results even under very difficult conditions, such as in the presence of dramatic sowing errors or abrupt camera movements. The computer vision system has been developed for integration into a treatment system because the ideal setup for any weed sprayer system would include a tool that could provide information on the weeds and crops present at each point in real-time, while the tractor mounting the spraying bar is moving

Noxious Weed Management: A Review of Herbicide Use at Colorado State Parks

Weed control in recreation areas is a complex public land management issue. Colorado State Parks are managed for both recreation and conservation, which often conflict. Noxious weeds affect both recreation and conservation efforts, and Parks often use herbicides to control these weeds. While herbicides are effective, they can be harmful to the environment and human health. Herbicide use at State Parks was reviewed to determine if chemical control is effective, safe, and efficient. The results revealed that many Parks are not using effective herbicides to treat noxious weeds and that some weed management plans lack pertinent information on chemical control. The results and recommendations provided can be used to improve the success of noxious weed control and create healthier Parks.

[Admittatur of Samuel Weed (Harvard AB 1800)], 1796 August 17

Published copy of the 1790 College Laws, bound in modern board binding, with the admittatur of undergraduate Samuel Weed signed by President Joseph Willard on August 17, 1796.

Pike, pickerel and muskalonge / by Alfred C. Weed, Assistant Curator of Fishes.

no.9(1927)

Helena National Forest (N.F.), noxious weed treatment project : environmental impact statement.

Mode of access: Internet.

Weed management guide for commercial vegetable growers, 1984 /

Cover title.

Improving Klamath weed ranges /

Mode of access: Internet.

University of Illinois weed control research report.

Issued 1987- in parts; part II has title: Illinois weed science research report.

WEED, a wonderful equation elimination device.

Thesis--University of Illinois.

General-contact weed killers : water soluble chemicals, oils & fortified oils, emulsions /

Mode of access: Internet.

Weed management guide 1988 for commercial vegetable growers /

"September 1987."

Report of results of national noxious weed questionnaire.

Caption title.

Outline of a proposed national program of weed research and control.

Mode of access: Internet.

Chemical weed-control equipment /

Mode of access: Internet.

Weed control by soil sterilization /

Mode of access: Internet.