|
|
|
| Registros recuperados: 77 | |
|
|
| Askegaard, Margrethe; Olesen, Jørgen E.; Rasmussen, Ilse A.; Driessen, Eugene; Nielsen, Erling; Thomsen, Henning C.; Bak, Holger; Lindberg, Julie F.. |
| Hvordan kan sædskiftet indrettes så den økologiske kornproduktion øges uden at bæredygtigheden mindskes? Dette centrale spørgsmål belyses med resultater fra et økologisk sædskifteforsøg, der i 1996/97 blev anlagt på tre lokaliteter i Danmark. Da forsyningen med kvælstof (N) kan være meget kritisk i økologisk kornproduktion blev forsøget designet med fokus på dyrkningsmæssige faktorer der har indflydelse på N-forsyningen. Tre faktorer blev undersøgt: 1) Betydning af andel af N-fikserende afgrøder i sædskiftet 2) Betydning af efterafgrøder 3) Betydning af tilførsel af husdyrgødning. Der blev målt udbytter, udvaskning af næringsstoffer samt forekomst af ukrudt. Forsøget demonstrerer vigtigheden af at undersøge dyrkningsfaktorer i en... |
| Tipo: Journal paper |
Palavras-chave: Cereals; Pulses and oilseeds Weed management Composting and manuring. |
| Ano: 2004 |
URL: http://orgprints.org/7854/1/7854.pdf |
| |
|
| |
|
| |
|
|
| Askegaard, Margrethe. |
| Nyt fra de økologiske sædskifteforsøg. Af Margrethe Askegaard, Danmarks JordbrugsForskning, Afd. for Plantevækst og Jord Aktiviteter i marken lige nu Der kan være langt mellem planer og virkelighed, især hvis vejret driller. Det har været så vådt, at vårsæden først nu, i skrivende stund d. 2. maj, er blevet sået på Flakkebjerg. Gyllen blev kørt ud tidligere på tør overflade, men som følge af vejrforholdene var der desværre en stor fugtighed i pløjelaget. Det gav grimme spor som sandsynligvis vil kunne ses resten af vækstsæsonen. Jorden på Flakkebjerg er i forvejen meget kompakt og vi har tidligere set væksthæmning af afgrøderne fordi rødderne har haft svært ved at udvikle sig i jorden. I dyrkningssystemer med lavt input af næringsstoffer er god... |
| Tipo: Newspaper or magazine article |
Palavras-chave: Farming Systems. |
| Ano: 2001 |
URL: http://orgprints.org/397/1/A2001%2D1.pdf |
| |
|
|
| Olesen, Jørgen E.; Hansen, Elly M.; Askegaard, Margrethe; Rasmussen, Ilse A.. |
| The effect of nitrogen (N) supply and weeds on grain yield of spring barley was investigated in an organic farming crop rotation experiment on three different soil types in Denmark from 1997 to 2001. Three experimental factors were included in the experiment in a factorial design: 1) crop rotation (lupin or pea/barley as previous crop to barley), 2) cover crop (with and without), and 3) manure (with and without). The crop rotations included grass-clover as a green manure crop. Animal manure was applied as slurry in rates corresponding to 40% of the N demand of the cereal crops. Application of 50 kg NH4-N ha-1 in manure (slurry) increased barley grain DM yield by 1.0 to 1.3 Mg DM ha-1, whereas the use of cover crops (primarily perennial ryegrass)... |
| Tipo: Journal paper |
Palavras-chave: Farming Systems. |
| Ano: 2007 |
URL: http://orgprints.org/3852/2/3852.pdf |
| |
|
|
| Askegaard, Margrethe. |
| Optimized application of nitrogen from livestock manure will reduce nitrogen losses and result in higher yields. Practical recommendation Nitrogen application from livestock manure to winter and spring crops has different effects on crop yields depending on the pre-crop and the amount of ammonium-N provided. The results above show that nitrogen availability from livestock manure is limited. Based on the results, the following recommendations can be made: • If the pre-crop is not nitrogen-fixing, apply 20 to 60 kg of ammonium-N from livestock manure prior to sowing of crops. • Livestock manure application to a spring crop after nitrogen-fixing clover-grass is not yield effective and may bear the risk of nitrogen losses. • If livestock manure is... |
| Tipo: Practice tool |
Palavras-chave: Composting and manuring; Farm nutrient management. |
| Ano: 2017 |
URL: http://orgprints.org/31052/1/PA_037_Utilization_of_Nitrogen_QR.pdf |
| |
|
| |
|
|
| Olesen, Jørgen E.; Rasmussen, Ilse Ankær; Askegaard, Margrethe. |
| For at belyse mulighederne for at dyrke mere økologisk korn til modenhed, blev der i 1996/97 anlagt et økologisk sædskifteforsøg på fire lokaliteter i Danmark: · Jyndevad (JB1) i Sønderjylland, · Foulum (JB4) i Midtjylland · Flakkebjerg (JB6) på Sjælland · Holeby (JB7) på Lolland Sædskifterne repræsenterer systemer med forskellige andele af korn og kvælstoffikserende afgrøder. De har været afprøvet med fire forskellige kombinationer af fangafgrøder (uden og med) og husdyrgødning (uden og med). Det giver en bred vifte af informationer om de enkelte systemers produktionsevne og stabilitet. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Farming Systems. |
| Ano: 2002 |
URL: http://orgprints.org/374/1/E0062.pdf |
| |
|
|
| Askegaard, Margrethe. |
| This tool is about growing cover crops in the best way in an organic arable crop rotation. Thus, the tool is for organic farmers and their advisors who want a successful implementation of and increased knowledge on growing cover crops – regardless of experience. Cover crops can if used properly have tremendous effect on soil quality, nutrient leaching/losses, weed pressure, and soil erosion – common challenges in arable farming. The tool helps to identify when to grow cover crops and where to position them in the rotation. Furthermore, it suggests cover crop species suitable for different soil types, degree of crop competition, existing N-pool in the field and how much seed is needed pr. ha. Structured as a factsheet, the tool provides... |
| Tipo: Practice tool |
Palavras-chave: Crop combinations and interactions; Soil; Weed management; Farm nutrient management. |
| Ano: 2016 |
URL: http://orgprints.org/31133/7/31133.png |
| |
|
|
| Olesen, Jørgen E.; Askegaard, Margrethe. |
| The crop rotation is a crucial and integral part of organic farming systems. It must be designed to maintain and exploit soil fertility, and to minimise the impacts on environment, e.g. through nitrate leaching. Crop rotations in organic farming typically include legume crops to provide nitrogen fixation and improve soil fertility. Catch crops are also commonly used, if demands for soil tillage to control perennial weeds allow. This paper presents results on nitrate leaching from a field experiment with comparison of three different crop rotations with and without catch crops designed for organic farming. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farming Systems. |
| Ano: 2003 |
URL: http://orgprints.org/3857/1/3857.pdf |
| |
|
|
| Olesen, Jørgen E.; Askegaard, Margrethe; Rasmussen, Ilse Ankær. |
| Three factors are included in a factorial field experiment: 1) fraction of grass-clover and pulses in the rotation (crop rotation), 2) catch crop (with or without catch crop), and 3) manure (with or without animal manure). Manure is applied as slurry in rates corresponding to 40 % of the nitrogen demand. Grain yields for three sites and three years of the experiment are presented for two four-course rotations. One rotation has a green-manure crop, which is replaced by winter wheat in the other rotation. The use of manure significantly increased grain yield of the cereal crops in most cases. The positive effects of the catch crops were mainly observed in the spring cereals. The largest rotation yields were obtained in the crop rotation without a... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Farming Systems. |
| Ano: 2000 |
URL: http://orgprints.org/357/1/B0048.pdf |
| |
|
|
| Askegaard, Margrethe; Olesen, Jørgen E.; Rasmussen, Ilse A.. |
| A crop rotation experiment was established in 1996/97 at three locations representing different soil types and climates. Three factors were tested: i) crop rotation with different proportions of N2-fixing crops, ii) with and without a catch crop, and iii) with and without animal manure. A green manure crop increased yields in the following cereal crops, but at the rotational level, total yields were larger in crop rotations without a green manure crop. There were positive effects of animal manure and catch crops on yield. However, except for the coarse sandy soil, the yield effects of catch crops and animal manure decreased over time when a grass-clover green manure was included in the rotation. It appeared that the buffering effect of clover can... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Specific methods. |
| Ano: 2005 |
URL: http://orgprints.org/4805/4/Askegaard_etal_4p_revised%2Ded.doc |
| |
|
| |
|
|
| Rasmussen, Ilse A.; Askegaard, Margrethe; Olesen, Jørgen E.. |
| Danish experiments with cereal-based organic crop rotations have shown that the short-term results (the first course, up to four years after conversion) are different from those obtained in the longer-term (the second course, fifth to eighth year after conversion). Yield gain from use of manure increased from the first to the second course on a sandy soil, but decreased on loamier soils. Yield gain from leguminous catch crops increased from the first to the second course in a crop rotation without grass-clover. Some of these effects were caused by buffering effects of the grass-clover, other effects were caused by changes in soil fertility over time. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions. |
| Ano: 2006 |
URL: http://orgprints.org/7680/1/Rasmussen_IA_et_al.doc |
| |
|
|
| Rasmussen, Ilse A.; Askegaard, Margrethe; Olesen, Jørgen E.. |
| The plant protection carried out in the Danish crop rotation experiment is described. These measures can be quite different in the different systems. While mechanical weed control can be carried out in systems without catch crops, it is not possible to do so in systems with catch crops without affecting the establishment of the catch crop. The occurrence of weeds, pests and diseases is recorded, and the results are described. Since the results are only from the two first years of the experiments, it is not possible to conclude anything about the crop rotations as such. There are however differences related to the other experimental treatments in the experiment: the presence or absence of catch crops and manure. Only in very few cases are the differences... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Weed management Crop health; Quality; Protection Cereals; Pulses and oilseeds. |
| Ano: 1999 |
URL: http://orgprints.org/247/1/DARCOF1.PDF |
| |
|
|
| Olesen, Jørgen E.; Rasmussen, Ilse A.; Askegaard, Margrethe. |
| For at belyse mulighederne for at dyrke mere økologisk korn til modenhed, blev der i 1996/97 anlagt et økologisk sædskifteforsøg på fire lokaliteter i Danmark: · Jyndevad (JB1) i Sønderjylland, · Foulum (JB4) i Midtjylland · Flakkebjerg (JB6) på Sjælland · Holeby (JB7) på Lolland Sædskifterne repræsenterer systemer med forskellige andele af korn og kvælstoffikserende afgrøder. De har været afprøvet med fire forskellige kombinationer af fangafgrøder (uden og med) og husdyrgødning (uden og med). Det giver en bred vifte af informationer om de enkelte systemers produktionsevne og stabilitet. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Cereals; Pulses and oilseeds. |
| Ano: 2003 |
URL: http://orgprints.org/1812/1/E0070.doc |
| |
|
| |
|
|
| Askegaard, Margrethe; Olesen, Jørgen E.; Kristensen, Kristian. |
| Nitrate leaching from crop rotations supporting organic grain production was investigated from 1997 to 2000 in a field experiment at three locations in Denmark on different soil types. Three experimental factors were included in the experiment in a factorial design: (1) proportion of N2-fixing crops in the rotation (crop rotation), (2) catch crop (with and without), and (3) manure (with and without). Three, four-course rotations were compared, two at each location. The nitrate leaching was measured using ceramic suction cells. Leaching losses from the crop rotation with grass–clover green manure and without catch crops were 104, 54 and 35 kgNha21 yr21 on the coarse sand, the loamy sand, and the sandy loam, respectively. There was no effect of manure... |
| Tipo: Journal paper |
Palavras-chave: Production systems Crop combinations and interactions Composting and manuring Recycling; Balancing and resource management Nutrient turnover Farm nutrient management. |
| Ano: 2005 |
URL: http://orgprints.org/18726/1/18726.pdf |
| |
|
|
| Askegaard, Margrethe. |
| Nyt fra sædskifteforsøg. Af Margrethe Askegaard, forsker ved Danmarks JordbrugsForskning Marken nu I skrivende stund er høsten i hus på Foulum og Holeby og på Jyndevad mangler kun lupin. Udbytterne er ikke gjort op, men meget tyder på at niveauet i Foulum og Jyndevad bliver det samme som sidste år mens Holeby melder om høje udbytter, i vinterhvede op over 80 hkg kerne/ha. De nye udlæg af kløvergræs og efterafgrøder står generelt pænt. På Foulum ligger den snittede halm visse steder i et tykt lag over udlægget. Det bliver derfor nødvendigt med en ekstra overkørsel med snitter for undgå kvælning af udlægget. Problemer med kløveren Sidste års udlæg af kløvergræs i vårbyggen på Foulum resulterede i meget forskellig udvikling af afgrøden, fra meget... |
| Tipo: Newspaper or magazine article |
Palavras-chave: Farming Systems. |
| Ano: 2000 |
URL: http://orgprints.org/395/1/A2000%2D2.pdf |
| |
|
|
| Olesen, Jørgen E.; Askegaard, Margrethe; Rasmussen, Ilse A.. |
| A crop rotation experiment was established in 1996/97 at three locations representing differ-ent soil types and climates. Three factors were tested: i) crop rotation with different propor-tions of N2-fixing crops, ii) with and without a catch crop, and iii) with and without animal manure. A green manure crop increased yields in the following cereal crops, but at the rota-tional level, total yields were larger in crop rotations without a green manure crop. There were positive effects of animal manure and catch crops on yield. However, except for the coarse sandy soil, the yield effects of catch crops and animal manure decreased over time when a grass-clover green manure was included in the rotation. The problems with perennial weeds increased over time... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover Cereals; Pulses and oilseeds Weed management. |
| Ano: 2005 |
URL: http://orgprints.org/7873/1/7873.pdf |
| |
| Registros recuperados: 77 | |
|
|
|
