| Автор | Kristensen, S. P. |
| Автор | Mathiasen, J. |
| Автор | Lassen, J. |
| Автор | Madsen, H. B. |
| Автор | Reenberg, A. |
| Дата выпуска | 1994 |
| dc.description | AbstractSoil samples collected from 26 organic and 550 conventional farms during autumn 1990 through the national Grid Net Survey (GNS) and a simultaneous supplementary survey on 8 organic farms have been analyzed in order to estimate the risk of nitrogen leaching. The average nitrate N (nitrogen) content in the soil (0–75 cm) was very similar in samples from organic farms (31kg/ha) and conventional farms using manure (29 kg/ha), but superior to that of conventional farms not using manure (22 kg/ha). Samples collected from fields on organic farms cultivated with grass with clover or alfalfa were very small (12 kg/ha) compared to samples from fields cultivated with cereals (57 kg/ha) and samples from bare fields following cereals (48 kg/ha). The average nitrate N content was higher in samples from clayey soil (40 kg/ha) than from sandy soils (15 kg/ha). The nitrate N content in samples from regions with a high percolation level during the autumn (August to December 1990) was lower than in samples from regions with a low percolation level. |
| Формат | application.pdf |
| Издатель | Taylor & Francis Group |
| Копирайт | Copyright Taylor and Francis Group, LLC |
| Тема | soil type |
| Тема | percolation level |
| Тема | crop succession |
| Название | A Comparison of the Leachable Inorganic Nitrogen Content in Organic and Conventional Farming Systems |
| Тип | research-article |
| DOI | 10.1080/09064719409411253 |
| Electronic ISSN | 1651-1913 |
| Print ISSN | 0906-4710 |
| Журнал | Acta Agriculturae Scandinavica, Section B – Soil & Plant Science |
| Том | 44 |
| Первая страница | 19 |
| Последняя страница | 27 |
| Аффилиация | Kristensen, S. P.; Institute of Geography, University of Copenhagen |
| Аффилиация | Mathiasen, J.; Institute of Geography, University of Copenhagen |
| Аффилиация | Lassen, J.; Institute of Geography, University of Copenhagen |
| Аффилиация | Madsen, H. B.; Institute of Geography, University of Copenhagen |
| Аффилиация | Reenberg, A.; Institute of Geography, University of Copenhagen |
| Выпуск | 1 |
| Библиографическая ссылка | Andersen, S. 1988. Landbrugsplanterne, Copenhagen: DSR Publ. Co. |
| Библиографическая ссылка | Granstedt, A. 1990. Fallstudier av kväveförsorjning i alternativ odling. Case studies on nitrogen supply in alternative farming (English summary), Alternative Agriculture no. 4 Uppsala: Sveriges Lantbruksuniversitet. |
| Библиографическая ссылка | Hedeselskabet. 1988. Map of annual average percolation in Denmark |
| Библиографическая ссылка | Jensen, K. M. and Reenberg, A. 1986. Landbrugsatlas Danmark, Atlas over Danmark, Serie 11 Vol 4, Copenhagen: C. A. Reitzel Publ. Co. |
| Библиографическая ссылка | Kristensen, I. and Kristensen, E. S. 1992. Analyse af kvælstofoverskud og -effektivitet på okologiske og konventionelle kvægbrug. Analysis of nitrogen surplus and efficiency on organic and conventional dairy farms (English summary), National Institute of Animal Science. Ministry of Agriculture. Report no. 710 |
| Библиографическая ссылка | Kristensen, S. P., Lassen, J. and Mathiasen, J. 1992. Potentialet for kvælstofudvaskning i okologisk jordbrug, M. Sc Thesis Institute of Geography, University of Copenhagen. |
| Библиографическая ссылка | Lampkin, N. 1990. Organic farming, Ipswich, , UK: Farming Press Books. |
| Библиографическая ссылка | Landbrugsministeriet. 1972. Fælles arbejdsmetoder for jordbundsanalyser, Copenhagen: Ministry of Agriculture. |
| Библиографическая ссылка | Landsforeningen økologisk jordbrug. 1991. Økologisk jordbrug - den bæredygtige losning, Århus: Landsforeningen økologisk jordbrug. |
| Библиографическая ссылка | Madsen, H. B. and Platou, S. W. 1983. Land Use Planning in Denmark: The Use of Soil Physical Data in Irrigation Planning. Nordic Hydrology, : 267–276. 1983 |
| Библиографическая ссылка | Simmelsgaard, S. 1985. Kvælstofkoncentration, -udvaskning og -balance. National Institute of Plant and Soil Science, Ministry of Agriculture. Report no. 1774 |
| Библиографическая ссылка | Smilde, K. W. 1989. “Nutrient supply and soil fertility”. In Development of farming systems Edited by: Zadocks, J. C. Wageningen, , The Netherlands |
| Библиографическая ссылка | Statens forurensningstilsyn. 1990. Miljøeffekter av økologisk jordbrug Oslo SFT-rapport nr. 101/1990 |
| Библиографическая ссылка | Søegaard, K. 1988. Sædskiftets og vandforsyningens indflydelse på næringstofudvaskning og -balance (English summary), National Institute of Plant and Soil Science, Ministry of Agriculture. Report no. 1926 |
| Библиографическая ссылка | Østergaard, H. S. and Hvelplund, E. 1983. Rapport fra ekskursion til Tyskland Holland, England (not published) |
| Библиографическая ссылка | Østergaard, H. S. and Mamsen, P. 1990. Kvadratnet for nitratundersøgelser i Danmark. Oversigt 1986–1989, Danish Agricultural Advisory Service. |
