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| Registros recuperados: 15 | |
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| Henriksen, Christian Bugge; Rasmussen, Jesper; Søgaard, Carsten. |
| In the original ridge tillage system as practiced in the US Corn Belt, ridges are formed during the growing season. Several studies have documented that this can reduce leaching of nutrients and improve fertilizer efficiency. This study was conducted to determine whether ridges formed in autumn can be used as an alternative to ploughing to reduce N leaching during autumn and winter, and thereby increase growth and N uptake of a subsequent unfertilized crop. A factorial field experiment with tillage and residues as factors was conducted during 1998-2000. Tillage treatments were autumn ridging and ploughing. Residue treatments were stubble, stubble+straw and stubble+liquid manure in order to create a gradient of C/N ratios. From the time of harvest until... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Farming Systems; Soil tillage. |
| Ano: 2005 |
URL: http://orgprints.org/3952/1/3952.pdf |
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| Henriksen, Christian Bugge; Rasmussen, Jesper; Mølgaard, Jens Peter. |
| Field experiments were conducted on sand and sandy loam from 2000-2002 to determine how timing of ridging affects potato tuber yield and quality depending on soil type and the use of catch crops. On sand, ridging in winter increased nitrogen availability in the 0-50 cm soil layer in spring by 19% from 5.7 to 6.8 mg N/kg soil compared with ridging in autumn (P<0.001) and by 8% from 6.3 to 6.8 mg N/kg soil compared with ploughing in spring (P<0.05). With a total and marketable yield of 27,9 t/ha and 14,2 t/ha respectively, ridging in winter resulted in higher tuber yield than both ridging in autumn and ridging in autumn combined with tilting and re-establishment of ridges in winter. These yield results were comparable to spring ploughing, but because... |
| Tipo: Journal paper |
Palavras-chave: Production systems; Root crops; Soil tillage. |
| Ano: 2005 |
URL: http://orgprints.org/4292/1/4292.pdf |
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| Rasmussen, Jesper; Griepentrog, Hans W.; Nielsen, J.; Henriksen, Christian Bugge. |
| There is much emphasis on technical aspects related to sensor or mapping techniques, which enable so-called intelligent cultivators to target the intra-row spaces within crop rows. This study investigates (i) an expected advantage of an intelligent rotor tine cultivator (the cycloid hoe) in terms of crop-weed selectivity and (ii) an expected synergistic effect between punch planting and post-emergence weed harrowing in terms of improved crop-weed selectivity. Selectivity is defined as the relationship between weed control and associated crop density decline one week after cultivation, and punch planting is a sowing technique where holes are created in the ground with a minimum of soil disturbance and seeds are inserted into them, without soil disturbance... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2012 |
URL: http://orgprints.org/20603/2/20603.pdf |
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| Henriksen, Christian Bugge. |
| Dybe jordløsninger øgede udbyttet af salgbare knolde med 14% i et tre-årigt markforsøg, men der var store forskelle mellem årene. I 2001 var udbyttet af salgbare knolde 49% højere mens det totale udbytte blev øget med 5%. I 2002 var der ikke nogen effekt og i 2003 reducerede dybe jordløsninger det totale knoldudbytte med 7%. Uddybende forsøg vil være nødvendige for at undersøge om det er muligt at opnå vedvarende højere salgbare udbytter ved at time de dybe jordløsninger i forhold til vækststadie og nedbørsmængde. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Farming Systems; Root crops; Soil tillage. |
| Ano: 2004 |
URL: http://orgprints.org/3955/1/3955.pdf |
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| Rasmussen, Jesper; Henriksen, Christian Bugge. |
| Jordløsning - er det svaret? Jesper Rasmussen & Christian Bugge Henriksen, Den Kgl. Veterinær og Landbohøjskole I stort set alle forsøg verden over har planter reageret positivt på en effektiv løsning af jorden i dybden. Når dybe jordløsninger alligevel ikke spiller nogen nævneværdig rolle i økologisk jordbrug, skyldes det, at det dels har vist sig svært at løsne joden effektivt i dybden med de eksisterende traktorredskaber, og dels er vanskeligt at fastholde en løs jord, hvis der fortsat foregår tung trafik på den. I forbindelse med dyrkning af højværdiafgrøder synes der basis for at eksperimentere med en kombination af effektiv løsning i dybden og kontrolleret trafik i faste kørespor. I forsøg er der opnået højere udbytter, lave brændstofforbrug... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil tillage. |
| Ano: 2000 |
URL: http://orgprints.org/421/1/svaret.pdf |
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| Rasmussen, Jesper; Griepentrog, Hans W.; Nielsen, J.; Henriksen, Christian Bugge. |
| There is much emphasis on technical aspects related to sensor or mapping techniques, which enable so-called intelligent cultivators to target the intra-row spaces within crop rows. This study investigates (i) an expected advantage of an intelligent rotor tine cultivator (the cycloid hoe) in terms of crop-weed selectivity and (ii) an expected synergistic effect between punch planting and post-emergence weed harrowing in terms of improved crop-weed selectivity. Selectivity is defined as the relationship between weed control and associated crop density decline one week after cultivation, and punch planting is a sowing technique where holes are created in the ground with a minimum of soil disturbance and seeds are inserted into them, without soil disturbance... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2012 |
URL: http://orgprints.org/21136/8/21136.pdf |
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| Rasmussen, Jesper; Henriksen, Christian Bugge; Griepentrog, Hans W.. |
| Experiences with a punch planter and an intelligent rotary tine weeder are summarized. The objectives were to investigate (1) to what extent punch planting and pre-emergence flame weeding can reduce intra-row weed emergence in direct sown crops like onion, carrot and sugar beet, (2) to what extent an intelligent intra-row weeder, a cycloid hoe based on RTK-GPS technology, can control intra-row weeds without damaging the crop in direct sown crops, (3) and to what extent there exists synergy between punch planting with pre-emergence flame weeding and mechanical intra-row weeding. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management. |
| Ano: 2011 |
URL: http://orgprints.org/18777/1/18777.pdf |
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| Henriksen, Christian Bugge; Mølgaard, Jens Peter; Rasmussen, Jesper. |
| Autumn ridging is a modified version of the ridge tillage system. Instead of setting up ridges during the growing season, they are established in autumn and left for the winter. Previous studies have documented positive effects of autumn ridging on potato yield and we hypothesize that applying subsoiling could enhance these effects. To determine the effect of autumn ridging and inter-row subsoiling on potato yield and quality a field experiment was conducted on sandy soil from 2001-2003. Autumn ridging showed comparable yields to ploughing and significantly reduced the incidence of black scurf from 2.5% to 2.2%. Inter-row subsoiling in the growing season significantly increased marketable potato tuber yield from 84.4 hkg/ha to 96.3 hkg/ha and reduced the... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Root crops Soil tillage. |
| Ano: 2004 |
URL: http://orgprints.org/4290/1/4290.pdf |
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| Rasmussen, Jesper; Henriksen, Christian Bugge; Griepentrog, Hans W.; Nielsen, Jon. |
| Punch planting has recently been suggested to reduce intra-row weeds in organically grown row crops. In this method holes are punched in the ground with a minimum of soil disturbance and seeds are inserted into them, without soil disturbance outside the hole. The first experiments with a tractor-mounted prototype of a dibber drill (MK III) are presented here. In two years, three plant establishment procedures were compared at five different sowing dates in sugar beet and direct-sown onion. The plant establishment procedures were 1) normal sowing and mechanical control of weeds in the stale seedbed (N), 2) N + pre-emergence flame weeding (N+F), and 3) punch planting and flame weeding to control weeds in the seedbed and prior to crop emergence (P +F). The... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2010 |
URL: http://orgprints.org/17904/1/17904.pdf |
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| Registros recuperados: 15 | |
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