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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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| Wahid, R; Ward, AJ; Møller, HB; Søegaard, K; Eriksen, J. |
| This study investigated the potentials of forbs; caraway, chicory, red clover and ribwort plantain as substrates for biogas production. One-, two- and four-cut systems were implemented and the influence on dry matter yields, chemical compositions and methane yields were examined. The two- and four-cut systems resulted in higher dry matter yields (kg [total solid, TS] ha-1) compared to the one-cut system. The effect of plant compositions on biogas potentials was not evident. Cumulative methane yields (LCH4 kg-1 [volatile solid, VS]) were varied from 279 to 321 (chicory), 279 to 323 (caraway), 273 to 296 (ribwort plantain), 263 to 328 (red clover) and 320 to 352 (grass-clover mixture), respectively. Methane yield was modelled by modified Gompertz equation... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions. |
| Ano: 2015 |
URL: http://orgprints.org/31783/1/1-s2.0-S0960852415012791-main.pdf |
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| Cong, W-F; Søegaard, K; Eriksen, J. |
| Highly productive temporary grasslands in Europe are usually composed of only a few plant species, and are typically dominated by perennial ryegrass-clover mixtures. Including additional competitive forb species holds potential for enhancing productivity in temporary grasslands, but requires further demonstration. In a grassland biodiversity experiment, one or all of the three forb species: chicory (Cichorium intybus L.), caraway (Carum carvi L.) and plantain (Plantago lanceolata L.), were grown in different proportions with the perennial ryegrass (Lolium perenne L.)-red clover (Trifolium pratense L.)mixture under two slurry application levels (0 and 250 kg total N ha-1 year-1). Dry matter (DM) yield and botanical composition were determined in 2014 and... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop combinations and interactions; Farm nutrient management. |
| Ano: 2016 |
URL: http://orgprints.org/31333/1/Cong%20et%20al.%202016%20EGF.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, 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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| 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; Mogensen, J. |
| Undersøgelsens formål var at forbedre kvælstofudnyttelsen og mindske uønskede miljømæssige konsekvenser af sædskiftet på intensive malkekvægsbedrifter. Eftervirkningen af seks forskellige græsmarkstyper (1994-96) på udbytte og nitratudvaskning i de efterfølgende kornafgrøder (1997-99) blev undersøgt på lerblandet sandjord ved Forskningscenter Foulum. Græsmarkerne var ugødet kløvergræs og gødet rajgræs enten til slæt eller afgræsset med malkekøer fodret med to niveauer af N i suppleringsfoder. I det første år efter ompløjning var der tilstrækkeligt eftervirkning af afgræsningsmarkerne til at overflødiggøre yderligere gødningstilførsel, men i de følgende år var der gradvist behov for mere N-gødning for at opnå optimale udbytter. Jordbehandling blev... |
| Tipo: Report |
Palavras-chave: Nutrient turnover. |
| Ano: 2001 |
URL: http://orgprints.org/230/1/rapport.doc |
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| Dhamala, NR; Eriksen, J; Carlsson, G; Søegaard, K; Rasmussen, J. |
| Background and aims While N2-fixation in diversified grasslands including forage legumes and non-legumes has been widely studied, N2-fixation in swards containing only forage legumes remains unclear. In this study, we investigated N2-fixation in pure stands and mixtures of three forage legumes. Methodology N2-fixation, dry matter (DM) and nitrogen (N) yields were quantified in a field experiment for red clover (Trifolium pratense L.), white clover (Trifolium repens L.) and lucerne (Medicago sativa L.) pure stands and mixtures using the isotope dilution method. Results All three forage legume species derived most (around 85%) of their N from atmospheric N2-fixation (%Ndfa). However, no positive effect of species diversity was found in any of the mixtures.... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Nutrient turnover; Soil. |
| Ano: 2017 |
URL: http://orgprints.org/31784/1/Dhamala%20et%20al%202017%20Plant%20and%20Soil.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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| Rasmussen, J; Eriksen, J; Jensen, E S; Høgh-Jensen, H. |
| Two field experiments investigating dynamics in grass-clover mixtures were conducted, using 15N- and 14C-labelling to trace carbon (C) and nitrogen (N) from grass (Lolium perenne L.) and clover (Trifolium repens L. and Trifolium pratense L.). The leaching of dissolved inorganic nitrogen (DIN), as measured in pore water sampled by suction cups, increased during the autumn and winter, whereas the leaching of dissolved organic nitrogen (DON) was fairly constant during this period. Leaching of 15N from the sward indicated that ryegrass was the direct source of less than 1-2 percent of the total N leaching measured, whereas N dynamics pointed to clover as an important contributor to N leaching. Sampling of roots indicates that the dynamics in smaller roots were... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2008 |
URL: http://orgprints.org/14647/1/Full_length_paper_Jim_Rasmussen.pdf |
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| Registros recuperados: 42 | |
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