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Registros recuperados: 31
Primeira ... 12 ... Última
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A method for high accuracy geo-referencing of data from field operations Organic Eprints
Nørremark, Michael; Griepentrog, Hans W..
In this project a Real Time Kinematic Global Position System (RTKGPS) was used to provide high accuracy field operation data. The deviations and errors of the RTKGPS when used in static and dynamic modes were studied as well as the accuracy of RTK GPS in eastern Denmark (55 40 N, 12 18 E) during a 24-hour test. The project introduced a novel real time data acquisition system and post-processing algorithms for improving positioning by merging RTKGPS data with vehicle altitude.
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 2003 URL: http://orgprints.org/4837/1/4837.pdf
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A new concept for the control of Elytrigia repens in organic crop production Organic Eprints
Melander, Bo; Nørremark, Michael; Fløjgaard, Erik.
The control of perennial weeds in organic crop production needs reconsideration to minimise losses of nutrients through leaching. Long post-harvest periods with mechanical weed control hinder a plant cover with the purpose of taking up nutrients not being utilised by the main crop to maintain soil fertility. To meet the interests of nutrient and weed management, we suggest a new concept for the control of perennial weeds with propagules placed within the plough layer. The concept comprises uprooting and immediate removal of Elytrigia repens rhizomes with modified machinery to allow for a quick re-establishment of a plant cover to avoid longer periods of bare soil. Four passes with a modified cultivator where each pass was followed by rhizome removal and...
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 2012 URL: http://orgprints.org/22277/13/22277.pdf
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Advanced Non-Chemical and Close to Plant Weed Control system for Organic Agriculture Organic Eprints
Nørremark, Michael; Swain, Kishore; Melander, Bo.
Use of chemical has been reduced in agriculture for controlling weeds emergence. The use of alternative systems, such as cultural practices (mulching, flame, intercropping etc.) and mechanical system (hoe, tine etc.) has been introduced by various researchers. Automation technique based on sensors controlled system has enhanced the efficiency of the mechanical system for weed control. Mostly, low cost image acquisition sensors and optical sensor to detect the plant ensuring swift operation of vehicles close the crop plants to remove competitive weeds. The available system need to be evaluated to get best possible system for close to plant (CTP) weed removal. In the study various non-chemical weed control measures has been explored and 30 mechanical tools...
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 2009 URL: http://orgprints.org/20656/4/20656.pdf
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Analysis and Definition of the close-to-crop Area in Relation to Robotic Weeding Organic Eprints
Nørremark, Michael; Griepentrog, Hans W..
The objective of this paper is to analyse and define the field conditions close to the crop plants of sugar beet (Beta vulgaris L.). The aim is to use this study for the choice and development of new physical weeding methods to target weeds at individual plant scale level. It was found that the close to crop area is like a ring structure, comprising an area between an inner- and outer-circle around the sugar beet seedling. Physical weeding should not be applied to the area within the inner circle. The radius of the inner circle increases with the appearance of young beet leaves during the growth season. It was also found, that no weeds were germinating within 1 cm around individual sugar beet seedlings. Therefore this distance should be added to the...
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 2004 URL: http://orgprints.org/4834/1/4834.pdf
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Assessment of leaf cover and crop soil cover in weed harrowing research using digital images Organic Eprints
Rasmussen, Jesper; Nørremark, Michael; Bibby, Bo Martin.
Objective assessment of crop soil cover, defined as the percentage of leaf cover that has been buried in soil due to weed harrowing, is crucial to further progress in post-emergence weed harrowing research. Up to now, crop soil cover has been assessed by visual scores, which are biased and context dependent. The aim of this study was to investigate whether digital image analysis is a feasible method to estimate crop soil cover in the early growth stages of cereals. Two main questions were examined: (1) how to capture suitable digital images under field conditions with a standard high-resolution digital camera and (2) how to analyse the images with an automated digital image analysis procedure. The importance of light conditions, camera angle, size of...
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 2007 URL: http://orgprints.org/11007/1/11007.pdf
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Automatic identification of crop and weed species with chlorophyll fluorescence induction curves Organic Eprints
Tyystjärvi, Esa; Nørremark, Michael; Mattila, Heta; Keränen, Mika; Hakala-Yatkin, Marja; Ottosen, Carl-Otto; Rosenqvist, Eva.
Automatic identification of crop and weed species is required for many precision farming practices. The use of chlorophyll fluorescence fingerprinting for identification of maize and barley among six weed species was tested. The plants were grown in outdoor pots and the fluorescence measurements were done in variable natural conditions. The measurement protocol consisted of 1 s of shading followed by two short pulses of strong light photosynthetic photon flux density 1700 lmol m-2 s-1) with 0.2 s of darkness in between. Both illumination pulses caused the fluorescence yield to increase by 30–60% and to display a rapid fluorescence transient resembling transients obtained after long dark incubation. A neural network classifier, working on 17 features...
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 2011 URL: http://orgprints.org/20654/4/20654.pdf
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Automatiske redskaber til ukrudtsbekæmpelse Organic Eprints
Nørremark, Michael; Melander, Bo.
New technologies for automatic weed control in row crops are presented
Tipo: Newspaper or magazine article Palavras-chave: Weed management.
Ano: 2009 URL: http://orgprints.org/16221/1/16221.pdf
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Combining mechanical rhizome removal and cover crops for Elytrigia repens control in organic barley systems Organic Eprints
Melander, Bo; Nørremark, Michael; Kristensen, E.F..
Mechanical weed control of perennial weeds in organic crop production over long post-harvest periods is incompatible with the establishment of cover crops for improving soil quality and preventing nutrient leaching. We suggest a new concept that comprises uprooting and immediate removal of vegetative propagules located within the plough layer to allow for quick re-establishment of a plant cover. A field experiment comparing the effects of conventional practices (stubble cultivation) with different combinations of rotary cultivation (1, 2 or 4 passes) and cover crops (none vs rye-vetch-mustard mixture) on Elytrigia repens rhizome removal, shoot growth and suppression of a subsequent barley crop were examined in two growing seasons. Four passes with a...
Tipo: Journal paper Palavras-chave: Crop husbandry; Weed management.
Ano: 2013 URL: http://orgprints.org/25676/7/25676.pdf
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Controlled traffic farming increased crop yield, root growth, and nitrogen supply at two organic vegetable farms Organic Eprints
Hefner, M.; Labouriau, R.; Nørremark, Michael; Kristensen, Hanne Lakkenborg.
Increased farm machinery weight in agricultural production results in soil compaction. Controlled traffic farming (CTF) restricts traffic to permanent lanes, thereby creating traffic free beds for crop production. Field experiments were conducted at two organic vegetable farms in Denmark, on a sandy loam (2013–2016) and on coarse sand (2013–2015) to investigate CTF effects compared with random traffic farming (RTF) on vegetable yield, root growth, and soil mineral nitrogen (N). Root growth was measured using minirhizotrons. White cabbage, potato, and beetroot yield increased by 27%, 70% and 42%, respectively, in CTF compared with RTF in 2015 and winter squash indicated a yield increase of 43% on sandy loam in 2016. White cabbage (2015) and potato, beetroot...
Tipo: Journal paper Palavras-chave: Soil quality; Crop combinations and interactions; Nutrient turnover; Soil tillage; Air and water emissions; Vegetables; Root crops.
Ano: 2019 URL: http://orgprints.org/35456/1/Hefner%20et%20al%202019%20Controlled%20traffic%20farming.pdf
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Das Konzept des "controlled traffic farming" im ökologischen Gemüseanbau Organic Eprints
Hefner, M.; Nørremark, Michael; Kristensen, Hanne L..
Problems of machinery induced soil compaction are evident in organic vegetable production, resulting in stunted root growth and reduced yield. Controlled traffic farming (CTF) provides a possibility to restrict soil compaction to wheel tracks and create traffic-free vegetable beds with improved soil structure. A field experiment was established at a commercial organic vegetable farm in Denmark to investigate the effect of CTF on the growth of cabbage (Brassica oleracea), potato (Solanum tuberosum) and beetroot (Beta vulgaris). Random traffic farming (RTF) served as the control. Preliminary results show that root intensity was higher in the CTF treatment compared to the RTF treatment for cabbage at the end of the growing season, indicating a better soil...
Tipo: Conference paper, poster, etc. Palavras-chave: Vegetables; Buildings and machinery.
Ano: 2017 URL: http://orgprints.org/31850/1/Das%20Konzept%20des%20%E2%80%9Econtrolled%20traffic%20farming%E2%80%9C%20im.pdf
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Den digitale mark Organic Eprints
Nørremark, Michael; Griepentrog, Hans W..
Moderne og yderst præcis teknologi i jordbruget kan på sigt spare landmænd for at bruge unødvendigt store mængder pesticider. Ved hjælp af centimeterpræcis GPS-teknologi kombineret med digitale og optiske sensorer er det nu muligt at kortlægge de såede frø på en hel mark.
Tipo: Newspaper or magazine article Palavras-chave: Weed management.
Ano: 2003 URL: http://orgprints.org/4832/1/4832.pdf
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Development of tools for automated physical weed control Organic Eprints
Nørremark, Michael; Melander, Bo.
Tools are being developed for automated physical weed control in the close to crop area. The most promising weed control concepts are the so-called high precision tillage solutions and thermal weed control by pulsed lasers.
Tipo: Newspaper or magazine article Palavras-chave: Weed management.
Ano: 2009 URL: http://orgprints.org/16206/1/16206.pdf
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Digital image analysis offers new possibilities in weed harrowing research Organic Eprints
Rasmussen, Jesper; Nørremark, Michael.
Two field experiments were carried out in winter wheat to determine the optimal intensity and timing of weed harrowing. Each experiment was designed to create a series of intensities by increasing the number of passes at varying growth stages. Visual assessments and digital image processing were used to assess crop soil cover associated with weed harrowing. The study showed that winter wheat responded differently to weed harrowing at different growth stages. In autumn, the crop was severely damaged due to high degrees of crop soil cover and poor recovery resulting in crop yield losses in the range of 7 % to 22 %. In early spring, the crop showed some variability in the ability to recover from soil cover. The best results in spring were obtained at growth...
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 2006 URL: http://orgprints.org/10474/1/10474.pdf
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Digital images for assessing soil cover of crop plants Organic Eprints
Rasmussen, Jesper; Nørremark, Michael.
The main drawback by using crop soil cover in weed harrowing research is that it is assessed by visual scores, which are biased and context dependent. This problem may be solved by using digital image analysis. In this paper a new image capture standard and digital image analysis procedure was used to illustrate three key issues in relation to weed harrowing; selectivity, resistance and recovery. All issues require reliable assessments of crop soil cover. Crop soil cover was deduced from assessments of leaf cover, which is defined as the proportion of pixels in digital images determined to be green. Objective assessments of leaf cover and crop soil cover showed that the selectivity of weed harrowing in winter wheat and spring barley was unaffected by...
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 2007 URL: http://orgprints.org/10759/1/10759.pdf
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Digital images for assessing soil cover of crop plants Organic Eprints
Rasmussen, Jesper; Nørremark, Michael.
The main drawback by using crop soil cover in weed harrowing research is that it is assessed by visual scores, which are biased and context dependent. This problem may be solved by using digital image analysis. In this paper a new image capture standard and digital image analysis procedure was used to illustrate three key issues in relation to weed harrowing; selectivity, resistance and recovery. All issues require reliable assessments of crop soil cover. Crop soil cover was deduced from assessments of leaf cover, which is defined as the proportion of pixels in digital images determined to be green. Objective assessments of leaf cover and crop soil cover showed that the selectivity of weed harrowing in winter wheat and spring barley was unaffected by...
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 2007 URL: http://orgprints.org/10758/1/10758.pdf
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Exposure and destruction of Elymus repens rhizomes and Rumex crispus rootstocks Organic Eprints
Melander, Bo; Nørremark, Michael; Fløjgaard, Erik.
The paper summaries the latest achievements with the development of new technologies for uprooting and destroying vegetative propagules of Elytrigia repens and Rumex crispus
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 2008 URL: http://orgprints.org/16209/1/16209.pdf
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Forskning i ukrudtsharvning får nyt liv med digital billedbehandling Organic Eprints
Rasmussen, Jesper; Nørremark, Michael.
Digital billedbehandling udfylder et metodemæssigt tomrum i forhold til ukrudtsharvning. Med udvikling af en ny billedbehandlingsprocedure er det ikke længere nødvendigt at anvende visuelle bedømmelser af afgrødetildækningen ved ukrudtsharvning. Artiklen giver eksempler på hvordan digital billedbehandling kan anvnedes.
Tipo: Journal paper Palavras-chave: Weed management.
Ano: 2007 URL: http://orgprints.org/10694/1/10694.pdf
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Hortibot: Feasibility study of a plant nursing robot performing weeding operations – part IV Organic Eprints
Sørensen, Claus G.; Nørremark, Michael; Jørgensen, Rasmus N.; Jensen, Kjeld; Maagaard, Jørgen; Jensen, Lars Aa..
Based on the development of a robotic tool carrier (Hortibot) equipped with weeding tools, a feasibility study was carried out to evaluate the viability of this innovative technology. The feasibility was demonstrated through a targeted evaluation adapted to the obtainable knowledge on the system performance in horticulture. A usage scenario was designed to set the implementation of the robotic system in a row crop of seeded bulb onions considering operational and functional constraints in organic crop, production. This usage scenario together with the technical specifications of the implemented system provided the basis for the feasibility analysis, including a comparison with a conventional weeding system. Preliminary results show that the automation...
Tipo: Conference paper, poster, etc. Palavras-chave: Buildings and machinery.
Ano: 2007 URL: http://orgprints.org/11263/1/ASABE_paper_(2007)_%2DS%C3%B8rensen.pdf
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Individual plant care in cropping systems Organic Eprints
Griepentrog, Hans W.; Nørremark, Michael; Nielsen, Henning; Blackmore, Simon.
Individual plant care cropping systems, embodied in precision farming, may lead to new opportunities in agricultural crop management. The objective of the project was to provide high accuracy seed position mapping of a field of sugar beet. An RTK GPS was retrofitted on to a precision seeder to map the seeds as they were planted. The average error between the seed map and the actual plant map was about 32 mm to 59 mm. The results showed that the overall accuracy of the estimated plant positions is acceptable for the guidance of vehicles and implements. For subsequent individual plant care, the deviations were not, in all cases, small enough to ensure accurate individual plant targeting.
Tipo: Conference paper, poster, etc. Palavras-chave: Weed management.
Ano: 2003 URL: http://orgprints.org/4836/1/4836.pdf
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Kvik skal op og væk Organic Eprints
Melander, Bo; Nørremark, Michael; Kristensen, Erik Fløjgaard.
The article deals with previous results with the ability of different implements to uproot Elytrigia repens rhizomes.
Tipo: Newspaper or magazine article Palavras-chave: Weed management.
Ano: 2008 URL: http://orgprints.org/16213/1/16213.pdf
Registros recuperados: 31
Primeira ... 12 ... Última
 

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