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| Registros recuperados: 42 | |
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| Wahid, R; Feng, L; Cong, WF; Ward, A; Møller, HB; Eriksen, J. |
| In the present study, biogas potentials of multispecies swards including grass, lucerne, caraway, ribwort plantain and chicory from two- and four-cut regimes (Mix-2 and Mix-4) for mono-digestion applying batch and continuous modes under lab-scale conditions were investigated. The gas yields in terms of volatile solids (VS)loaded from Mix-2 and Mix-4 were compared with pure stand lucerne from the four cuts regime (Lu-4). The batch test results indicate that methane yield on a VS basis was highest from Mix-4 (295 L kg−1), followed by Mix-2 (281 L kg−1) and Lu-4 (255 L kg−1). The results were confirmed with continuous experiments, during which the reactor digesting Mix-4 was stable throughout the experiment with low ammonia and volatile fatty acid... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Nutrient turnover. |
| Ano: 2018 |
URL: http://orgprints.org/32974/1/Wahid%20et%20al%202018.pdf |
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| Eriksen, J; Askegaard, M; Søegaard, K. |
| Due to increasing size of Danish organic dairy farms uniform grazing of all cropped land becomes inexpedient due to long distance to the milking facilities. We investigated nutrient dynamics and feed production in two dairy crop rotations with internal differences in proportion of grazing and cutting. One six year crop rotation represents close to the farm buildings (barley [Hordeum vulgare L.] undersown with grass-clover [Lolium perenne L.–Trifolium repens L.] - 4 years of grass-clover - spring barley/catch crop) and another represents further away (barley undersown with grass-clover, 2 years of grass-clover -barley/catch crop - maize [Zea mays L.]/catch crop - lupin [Lupinus angustifolius]/catch crop). In each of the crop rotations was made five... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/14641/1/27FA_Eriksen_el_al._final_paper.pdf |
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| Eriksen, J; Thorup-Kristensen, K. |
| Sulphate leaching losses may reduce the long-term possibility of maintaining the S supply of crops in low input farming systems. The ability of catch crops (Italian ryegrass [Lolium multiflorum Lam], winter rape [Brassica napus L.] and fodder radish [Raphanus sativus L.]) to reduce soil sulphate concentrations in autumn and make it available to a succeeding crop was investigated in 1996-98 on sandy loam soil in Denmark. All catch crops reduced soil sulphate concentrations in the autumn compared to bare soil. Especially the cruciferous catch crops had the ability to deplete efficiently soil sulphate levels and thus, reduce the sulphate leaching potential. The S uptake in aboveground catch crop was 8, 22 and 36 kg S ha-1 for ryegrass, winter rape and fodder... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2002 |
URL: http://orgprints.org/168/1/paper.pdf |
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| Eriksen, J; Mogensen, J. |
| I flerårige afgræsningsmarker sker en betydelig ophobning af kvælstof (N), som ved ompløjning kan frigives og resultere i en stor nitratudvaskning. Forsøg på en lerblandet sandjord viser, at når god landbrugspraksis følges (forårspløjning og brug af efterafgrøder) giver de flerårige græsmarker en betydelig forfrugtsværdi i to år efter ompløjning, uden at nitratkoncentrationen i udvaskningsvandet overstiger EU’s grænseværdi for drikkevand på 50 mg pr. liter. |
| Tipo: Report |
Palavras-chave: Nutrient turnover. |
| Ano: 2001 |
URL: http://orgprints.org/232/1/Ompl%C3%B8jning_6si.pdf |
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| Eriksen, J. |
| Outdoor pig production may have benefits in terms of animal welfare but could be undesirable in terms of nutrient losses. In paddocks on sandy soil grazed by lactating sows, nitrate leaching was determined using the suction cup technique from the start of grazing in October to after the following barley/pea wholecrop with perennial ryegrass. The inorganic N concentration in soil was uneven after sow grazing with the highest values found near the feeding area. In contrast to low nitrate leaching in the year of grazing (25-30 kg N ha-1), losses were considerable in the following autumn and winter. Throughout the measuring period of 18 months, nitrate leaching inside paddocks was on average 320 kg N ha-1 with the major part near the feeding area. Ten m from... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2001 |
URL: http://orgprints.org/158/1/GFS2757.doc |
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| Eriksen, J; Petersen, SO; Sommer, SG. |
| There may be a conflict between animal welfare and nitrogen pollution in outdoor pig production. In response to concern about nitrogen being lost to the atmosphere and ground water we quantified spatial variation and temporal dynamics of mineral N, ammonia volatilization, denitrification and nitrate leaching from outdoor pig production at three commercial farms in Denmark. From paddocks containing farrowing sows substantial nitrogen losses were observed, particularly around the feeding areas. Gross ammonia emission rates varied between 0.08 and 1.26 kg N ha–1 d-1 and increased with animal density and N intake. The mean annual loss of ammonia per sow was 4.8 kg N. Denitrification rates averaged 0.52 kg N ha–1 d-1 in autumn following summer grazing with... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2002 |
URL: http://orgprints.org/229/1/MS_01.128_SP_05.doc |
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| Eriksen, J. |
| Det kræver god management at udnytte kvælstof i græsmarken. Det har generationer af forsøg på økologisk værkstedsareal vist. Siden 1997 har man langs en af indfaldsvejene til Forskningscenter Foulum – Burrehøjvej – kunnet se en stribe af de karakteristiske stålskabe, der anvendes til udvaskningsmålinger. Marken har været økologisk værkstedsareal med forsøg rettet imod forfrugtsværdi og udvaskning i græssædskifter. Men nu er det slut. Den sidste måling er lavet, og efter lang og tro tjeneste overgår marken nu til almindelig landbrugsdrift igen. |
| Tipo: Newspaper or magazine article |
Palavras-chave: Nutrient turnover; Dairy cattle; Air and water emissions. |
| Ano: 2007 |
URL: http://orgprints.org/11225/1/Klumme_JE_jan_07.doc |
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| Eriksen, J. |
| Det er i stigende grad store bedrifter med mange køer, som præger billedet i økologisk mælkeproduktion. Konsekvensen er, at afstandene bliver for store til afgræsning af markerne langt fra stalden. Derfor er der meget græs i sædskiftet tæt på stalden og det bliver intensivt afgræsset. Den udvikling har konsekvenser: Langvarige græsmarker er ofte mindre produktive og af dårligere kvalitet, det er sværere at udnytte kvælstof opsamlet i græsmarken og der kan være problemer med etablering af kløvergræs efter omlægning. Et nyt forskningsprojekt, som skal belyse disse problemstillinger, er netop startet ved Det Jordbrugsvidenskabelige Fakultet. I et markforsøg i Foulum undersøges strategier for sammensætning af sædskifter og management i græsmarker. Helt... |
| Tipo: Newspaper or magazine article |
Palavras-chave: Nutrient turnover; Dairy cattle; Air and water emissions. |
| Ano: 2007 |
URL: http://orgprints.org/11226/1/OrgGrass_landbrugsavisen.doc |
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| Cong, WF; Eriksen, J. |
| Increasing plant diversity in agroecosystems is proposed to enhance multiple ecosystem services. Adding selected forbs such as caraway (Carum carvi L.) and plantain (Plantago lanceolata L.) to productive grass-clover mixtures can further enhance forage yields, root biomass, uptake of mineral nutrients and improve animal performance. Yet, it remains unclear whether and how adding these forbs to grass-clover mixtures can influence soil microbial communities and associated soil carbon (C) and nitrogen (N) cycling. Based on a three-year grassland experiment varying in species diversity and composition with and without fertilizer application, we determined soil microbial community composition and functions related to C and N cycling under laboratory... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Nutrient turnover. |
| Ano: 2018 |
URL: http://orgprints.org/32975/1/Cong%20and%20Eriksen%202018.pdf |
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| Eriksen, J. |
| The effect of S and N application on the redistribution of S and the effect of N application and time of S application (from sowing to the middle of heading) on yield and quality of spring barley (Hordeum vulgare L.) was investigated in pot experiments. Nitrogen and sulphur had a clear interactive effect on the yield of all plant parts with little or no effect of S at low N application rates and similar low effect of N without S application. About 70% of leaf N was redistributed to the ears in plants growing at adequate S supply compared with about 35% of leaf N in S-deficient plants. The proportion of ear N and S originating from the redistribution of leaf N and S was 49% and 23%, respectively. Deficiency symptoms were observed already at the beginning... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover. |
| Ano: 2001 |
URL: http://orgprints.org/234/1/J_Eriksen_abstract.doc |
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| Cong, W-F; Jing, J; Rasmussen, J; Søegaard, K; Eriksen, J. |
| Intensively managed grasslands are dominated by highly productive grass-clover mixtures. Increasing crop diversity by inclusion of competitive forbs may enhance biomass production and sustainable biofuel production. Here we examined if one or all of three forbs (chicory, Cichorium intybus L.; caraway, Carum carvi L.; plantain, Plantago lanceolata L.) included in ryegrass-red clover mixtures enhanced above- and below-ground productivity, and assessed their biofuel potentials, based on a three-year experiment with and without fertilisation as cattle slurry. We determined herbage yield, standing root biomass, and estimated methane energy output and greenhouse gas (GHG) emissions per energy unit using life cycle assessment. Results showed that... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions. |
| Ano: 2017 |
URL: http://orgprints.org/31785/1/Cong_et_al-2017-Scientific_Reports.pdf |
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| Eriksen, J; Askegaard, M. |
| Sulphate leaching losses may reduce the long-term possibility of maintaining the S supply of crops in low input farming systems. Sulphate leaching and S balances were investigated in an organic dairy/crop rotation (barley [Hordeum vulgare] grass-clover [Lolium perenne/Trifolium repens] grass-clover barley/pea [Pisum arvénse] winter wheat [Tritucum aestivum] fodder beet [Beta vulgaris]) from 1994 until 1998. The importance of climatic conditions and use of different organic manure types at different application rates for sulphate leaching were investigated and related to the concurrent nitrate leaching. As an average of years, sulphate leaching from the crop rotation was 20 kg S ha-1, which was equivalent to 60% of the total input to the rotation.... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2000 |
URL: http://orgprints.org/144/1/text.doc |
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| Eriksen, J; Nielsen, M; Mortensen, JV; Schjørring, JK. |
| The effect of S and N application on the distribution and redistribution of S compounds in spring barley (Hordeum vulgare L.) was investigated in pot experiments by determination of changes in the content of total-, sulphate- and thiol-S in leaves, ears and stems during the grain-filling period. Nitrogen and sulphur had a clear interactive effect on the yield of all plant parts with little or no effect of S at low N application rates and similar low effect of N without S application. The sulphate concentration in the different plant parts was markedly affected by the S application rate. This effect was most pronounced in leaves, less in stems and least in ears. In S-replete plants leaf S decreased during grain development by an average of 28%, while in... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2001 |
URL: http://orgprints.org/154/1/paper.pdf |
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| Registros recuperados: 42 | |
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