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Thermal weed control by flaming

biological and technical aspects

Ascard, Johan (1995). Thermal weed control by flaming. Technical Report. Alnarp: (NL, NJ) > Dept. of Energy and Technology, Sveriges lantbruksuniversitet. Rapport - Sveriges lantbruksuniversitet, Institutionen för lantbruksteknik ; 200
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Abstract

The aim of this work was to study the influence of biological and technical factors on the effect of flame weeding, as a basis for reducing the energy consumption and increasing the effective ground speed required for good weed control Responses of weeds and test plants were evaluated in the field. Effects of propane dose and ground speed were described by logistic models. The sigmoidal dose-response and speed-response curves imply that propane dose and the ground speed can be adjusted to the required control effect, the weed flora and the developmental stage of the plants, A 95% reduction in susceptible annual weed species, with 0-4 true leaves, was achieved at propane doses of 10-20 kg ha^-1, and the weeds were completely killed at 20-50 kg ha^-1 (900-2300 MJ ha^-1). Considerably higher doses were needed at later stages and for more tolerant species. The most tolerant species could not be controlled with one treatment, regardless of dose. Flamers with different characteristics were studied Flamers with covered burners were generally more effective than an open flamer, especially on larger plants and tolerant species. The effective ground speed was generally higher for flamers with a higher fuel input, but only up to a certain level, A flamer with a relatively high propane consumption of 34 kg h^-1 per metre working width (440 kW m^-1) allowed an effective ground speed of 8 km h^-1 when smaller plants were treated, whereas the effective ground speed was 2,6 km h^-1 for a flamer with the more usual burner power of 12 kg h^-1 m^-1 (150 kW m^-1). Temperatures from the flamers were measured above the ground under weed-free conditions in the laboratory. There was generally a high correlation between different thermal parameters, e. g. the maximum temperature and the temperature sum, measured from the flamers in the laboratory, and the weed reduction in the field, although discrepancies were found, Flame weeding is useful although the method could be further improved.

Authors/Creators:Ascard, Johan
Title:Thermal weed control by flaming
Subtitle:biological and technical aspects
Series/Journal:Rapport - Sveriges lantbruksuniversitet, Institutionen för lantbruksteknik (0283-0086)
Year of publishing :1995
Number:200
Number of Pages:61
Place of Publication:Alnarp
Publisher:Institutionen för lantbruksteknik, Sveriges lantbruksuniversitet
ISSN:0283-0086
Language:English
Publication Type:Report
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Agronomy
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Plant production > Plant and forest protection
Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Area technology > Agricultural engineering
Keywords:dose-response, energy use, temperature, flame cover, burner power, weed species, speed-response, effective dose, effective ground speed, propane
URN:NBN:urn:nbn:se:slu:epsilon-8-274
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-8-274
ID Code:3853
Department:(NL, NJ) > Dept. of Energy and Technology
Deposited By: Erica Lövgren
Deposited On:26 Oct 2009 00:00
Metadata Last Modified:02 Dec 2014 10:25

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