|
|
|
| Registros recuperados: 30 | |
|
|
| Elmholt, S.. |
| En tung og knoldet jord er vanskelig at bearbejde. Det kan medføre et dårligt såbed og dårlig fremspiring. Og da en sådan jord også har få porer begrænses transporten af vand og ilt til planternes rødder. Herved forringes leveforholdene smådyr og mikroorganismer og der bliver en dårligere forsyning med næringsstoffer til planterne. For at få et godt såbed skal jorden have en god struktur – den skal gerne danne krummer (aggregater). De bygges op af jordens grunddele eller 'primærpartikler' ler og sand. Til at binde primærpartiklerne sammen kræves bindemidler. I danske jorde er biologiske bindemidler de vigtigste. Der findes to slags. Det ene er klisterstoffer, der dannes af planterødder, bakteri-er og svampe. Det andet er svampetråde (hyfer), der... |
| Tipo: Newspaper or magazine article |
Palavras-chave: Soil biology; Soil tillage. |
| Ano: 2005 |
URL: http://orgprints.org/7414/1/7414.pdf |
| |
|
| |
|
| |
|
|
| Schjønning, P.; Elmholt, S.; Christensen, B.T.. |
| The industrialization of agriculture and the concurrent increase in societal concerns on environmental protection and food quality have put focus on agricultural management and its impact on soil quality. Soil quality involves the ability of the soil to maintain an appropriate productivity, while simultaneously reducing the effect on the environment and contributing to human health. This development has changed society’s expectations to science and there is an urgent need to improve the communication among researchers from different scientific disciplines. The interaction of scientists with decision-makers is a topic of utmost relevance for future developments in agriculture. Reflexive objectivity denotes the exercise of raising one’s consciousness of the... |
| Tipo: Book chapter |
Palavras-chave: Research methodology and philosophy; Soil. |
| Ano: 2004 |
URL: http://orgprints.org/1470/1/A4659_Schjonning_Chap01.pdf |
| |
|
| |
|
|
| Elmholt, S.; Schjønning, P.; Munkholm, L.J.; Debosz, K.. |
| In order to improve our understanding of soil aggregation, we have studied the relative importance of bonding and binding mechanisms, especially how they scale according to aggregate size and how they are influenced by farming system and different management options. Topsoil samples were collected from four arable sandy loam soils found as two pairs (FP1 and FP2) of neighbouring fields. One of the fields in FP2 had been grown for decades with annual cash crops without application of organic manures, while the other three fields had been managed with diversified crop rotations and manure dressings. Aggregates were segregated from the bulk soil by promoting brittle failure. The samples of soil structural units were fractionated to 4-8 mm, 0.5-1 mm and... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Soil biology; Soil quality. |
| Ano: 2008 |
URL: http://orgprints.org/14642/1/Geoderma_2008_TwoPairs.pdf |
| |
|
| |
|
| |
|
|
| Köpke, U.; Thiel, B.; Elmholt, S.. |
| Mycotoxins are toxic metabolites formed by specific fungi that grow on living plants and their residues under favourable conditions. They are undesirable ingredients of food and feed. Risks are also posed by the spores and toxin-contaminated raised dusts. Contamination by mycotoxins is a severe problem in food security. More than 300 species of fungi with the ability to form mycotoxins have been identified. More than 400 metabolites are assigned to the group of mycotoxins. Fortunately, only about 20 mycotoxins produced by five genera of fungi (Fusarium, Penicillium, Claviceps, Alternaria and Aspergillus) are found regularly or periodically in food and feed at levels which might have an impact on human and animal health (Gareis, 1999a). Since synthetic... |
| Tipo: Book chapter |
Palavras-chave: Crop health; Quality; Protection Post harvest management and techniques. |
| Ano: 2007 |
URL: http://orgprints.org/7402/1/7402.pdf |
| |
|
| |
|
| |
|
|
| Schjønning, P.; Munkholm, L.J.; Elmholt, S.; Olesen, J.E.. |
| Management-induced depletion in soil organic carbon (SOC) may create critical tilth conditions for arable farming. We investigated the short-term effect of crop rotation and addition of animal manure on SOC fractions, the dispersibility of soil clay, the length of fungal hyphae, wet aggregate stability, tensile strength of dry aggregates, and the pore size distribution, gas diffusivity and permeability of undisturbed bulk soil. SOC fractions were measured in whole-soil samples and in 1-2 mm air-dried aggregates. Plough layer soil was sampled five and six years after the start of a field experiment with different cropping systems at two loamy sand soils (Foulum, ~9% clay and Flakkebjerg, ~14% clay). A soil drop test was performed in the field to evaluate in... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Soil biology; Soil quality; Soil tillage; Composting and manuring. |
| Ano: 2007 |
URL: http://orgprints.org/7750/1/7750.pdf |
| |
|
| |
|
|
| Kristensen, E.F.; Elmholt, S.; Thrane, U.. |
| Mycotoxin producing fungi are natural contaminants of cereals and their toxins are harmful to humans and animals. Ochratoxin A (OTA) is among the most important. Heat treatment by drum drying does not eliminate already formed mycotoxins but the technique can reduce the number of viable fungi on the grain. The aim of this study was to establish a drying regime that kills fungal propagules on rye without reducing its quality for baking. Special attention was paid to some important mycotoxin producing species. As drying temperatures and retention time in the drum are essential, the drum drier must be equipped with an effective control unit. Two different control systems were tested. The results showed that fungi colonising the grain can be much more... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Post harvest management and techniques Cereals; Pulses and oilseeds. |
| Ano: 2005 |
URL: http://orgprints.org/3327/1/3327.pdf |
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Frisvad, J.C.; Lund, F.; Elmholt, S.. |
| Aims: To examine if molecular amplified fragment length polymorphism (AFLP) fingerprinting of the only ochratoxin A-producing species in European cereals, Penicillium verrucosum, can be used as a method in hazard analysis using critical control points (HACCP). Methods and Results: A total of 321 isolates of P. verrucosum were isolated from ochratoxin A contaminated cereals from Denmark (oats), UK (wheat and barley) and Sweden (wheat). Of these, 236 produced ochratoxin A as determined by thin layer chromatography; 185 ochratoxin A-producing isolates were selected for AFLP fingerprinting. A total of 138 isolates had unique AFLP patterns, whereas 52 isolates could be allocated to small groups containing from two to four isolates with similar AFLP patterns.... |
| Tipo: Journal paper |
Palavras-chave: Post harvest management and techniques. |
| Ano: 2005 |
URL: http://orgprints.org/7392/1/7392.pdf |
| |
| Registros recuperados: 30 | |
|
|
|
