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| Larsen, T.; Magid, J.; Krogh, P.H.; Gorissen, A.. |
| Experimental data is still lacking for determining the significance of plant uptake of dissolved organic nitrogen (DON) in agricultural soils amended with organic fertilizers. Pulse-injection studies with dual-labelled amino acids have confirmed that non-mycorrhizal crops possess the capacity to take up DON but failed to quantify the uptake relative to total N uptake. In this study, dual-labelled green manure was added to soils with wheat plants. An advantage of using dual-labelled green manure as opposed to pulse injection of dual-labelled amino acids is that the amino acids in the fertilizer are released gradually, thus more naturally, and are therefore less susceptible to immediate microbial immobilization. The plants were harvested on days 27, 56, and... |
| Tipo: Journal paper |
Palavras-chave: Soil biology. |
| Ano: 2005 |
URL: http://orgprints.org/5859/1/5859.doc |
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| Demsar, D.; Dzeroski, S.; Larsen, T.; Struyf, J.; Axelsen, J.; Bruus-Pedersen, M.; Krogh, P.H.. |
| In agricultural soil, a suite of anthropogenic events shape the ecosystem processes and populations. However, the impact from anthropogenic sources on the soil environment is almost exclusively assessed for chemicals, although other factors like crop and tillage practices have an important impact as well. Thus, the farming system as a whole should be evaluated and ranked according to its environmental benefits and impacts. our starting point is a data set describing agricultural events and soil biological parameters. Using machine learning methods for inducing regression and model trees, we produce empirical models able to predict the soil quality from agricultural measures in terms of quantities describing the soil microarthropod community. We are also... |
| Tipo: Journal paper |
Palavras-chave: Soil biology; Biodiversity and ecosystem services. |
| Ano: 2006 |
URL: http://orgprints.org/7992/1/7992.pdf |
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| Axelsen, J.; Bruus-Pedersen, M.; Larsen, T.; Krogh, P.H.. |
| Soil fauna diversity, as well as total mite and springtail numbers was correlated with soil type, tillage intensity and fertiliser use as well as crop and grazing history and duration of the current state of the field. 430 samples taken in 2002 on a wide range of organically farmed fields also showed that soil type interacted with crop type and grazing intensity. A higher number of mites and springtails were found in crops that included clover, almost independently of soil type. Higher numbers of mites were found at high grazing intensity compared to low grazing intensity on the same soil type. In 2003, microarthropods were collected in spring, summer and autumn in Southern Jutland, Mid-Jutland and Sealand. In each region both cereal and vegetable fields... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services; Soil tillage. |
| Ano: 2006 |
URL: http://orgprints.org/7981/2/7981.pdf |
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