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| Registros recuperados: 40 | |
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| Noe, Egon; Sørensen, Peter; Melander, Bo; Olesen, Jørgen E.; Hermansen, Sven; Bertelsen, Inger; Fog, Erik. |
| I det økologiske forskningsprojekt, HighCrop, under GUDP - går økologiske planteavlere, konsulenter og forskere sammen om at finde ud af, hvordan planteavlen på de økologiske planteavlsbedrifter kan udvikles til at være mere robuste og bæredygtige. Et af indsatsområderne er, via interviewbesøg med 10 økologiske planteavlere, at afdække, hvordan den faglige viden når ud til landmændene og hvilke rådgivningstiltag og redskaber der bedst muligt kan understøtte denne videndeling. Denne rapport beskriver det teoretiske og metodiske grundlag for denne barriere undersøgelse |
| Tipo: Report |
Palavras-chave: Crop husbandry Social aspects Education; Extension and communication Weed management Farm nutrient management. |
| Ano: 2012 |
URL: http://orgprints.org/22116/7/22116.pdf |
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| Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ma, Xiuzhi; Ambus, Per. |
| More efficient use of green manure-derived nitrogen (N) may improve crop yields and reduce environmental impacts in stockless organic arable farming. In this 3-month incubation study, we tested a new strategy where green manure leys are harvested and preserved until the following spring either as compost mixed with straw or as silage of harvested ley biomass. Grass-clover compost or silage was soil-incorporated by either simulated ploughing (green manure placed at 15 cm depth) or harrowing (green manure mixed into the upper 5-cm soil horizon) in order to assess treatment effects on net release of plant-available N, nitrous oxide (N2O) fluxes, and soil respiration. Grass-clover silage provided the highest net N release with similar results for the two... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2014 |
URL: http://orgprints.org/25158/7/25158.pdf |
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| Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ambus, Per. |
| Organic arable farming faces challenges with low crop yields, partly due to inefficient use of green manure-derived nitrogen (N). Under current farming practices, green manure leys are often cut and mulched during the growing season with the associated risk of environmental N losses, leading to eutrophication and global warming. In this 3-month incubation experiment, we tested a new green manure management strategy as part of the ICROFS project HighCrop. With the new strategy, green manure leys are instead harvested and preserved until the following spring either as compost mixed with straw (grass-clover:straw, 4:1, w:w) or as silage of harvested ley biomass. In spring, these two green manure materials can then be used for targeted fertilization of spring... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2013 |
URL: http://orgprints.org/25941/19/25941a.pdf |
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| Thomsen, Ingrid Kaag; Sørensen, Peter. |
| Jordbearbejdning foretages almindeligvis for at klargøre jorden til såning eller for at nedmulde planterester og gødning. Ligeledes kan jordbearbejdning finde sted både i og uden for vækstsæsonen i forbindelse med mekanisk ukrudtsbekæmpelse. Der er en udbredt opfattelse af, at ukrudtsbekæmpelse, foretaget fx ved radrensning af rækkeafgrøder i vækstsæsonen, også øger mineraliseringen af kvælstof. En øget kvælstofmineralisering formodes at finde sted som følge af, at den mekaniske bearbejdning bryder jordknolde, hvorved der blotlægges organisk materiale, som nedbrydes. Samtidigt fremmer jordbearbejdningen luftskiftet i jorden, og betingelserne for omsætning forventes dermed forbedrede. En øget kvælstofmineralisering som følge af jordbearbejdning... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2004 |
URL: http://orgprints.org/4580/1/4580.PDF |
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| Sørensen, Peter; Kristensen, E.; Odokonyero, K.; Petersen, S.O.. |
| The utilization of nitrogen (N) in green manure leys can be improved by harvesting, storage and spreading of the plant material as manure in other crops. By green manure storage as silage, storage losses of N are lower than by composting. Also, a relatively high fertilizer value of silage N is achievable depending on the C/N ratio of the material. Nitrogen availability in green manure leys is higher after storage as silage compared to composting. Use of mobile green manures is mainly relevant in arable cropping systems without livestock where utilization of the roughage for animal feed or biogas production is impossible, as costs for ley/roughage harvest and transport can be relatively high. Our study showed that surface application of green manure silage... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops; Composting and manuring; Farm nutrient management. |
| Ano: 2013 |
URL: http://orgprints.org/24575/1/24575.pdf |
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| Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ma, Xiuzhi; Ambus, Per. |
| More efficient use of green manure-derived nitrogen (N) may improve crop yields and reduce environmental impacts in stockless organic arable farming. In this 3-month incubation study, we tested a new strategy where green manure leys are harvested and preserved until the following spring either as compost mixed with straw (grass-clover:straw, 4:1, w:w) or as silage of harvested ley biomass. Grass-clover compost or silage was soil-incorporated by either simulated ploughing (green manure placed at 15 cm depth) or harrowing (green manure mixed into the upper 5-cm soil horizon) in order to assess treatment effects on net release of plant-available N, nitrous oxide (N2O) fluxes, and soil respiration. Grass-clover silage provided the highest net N release with... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2013 |
URL: http://orgprints.org/24960/7/24960.pdf |
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| Hu, Teng; Sørensen, Peter; Wahlström, E.M.; Chirinda, Ngonidzashe; Sharif, Behzad; Li, Xiaoxi; Olesen, Jørgen E.. |
| Reliable information on belowground plant biomass is essential to estimate belowground carbon inputs to soils. Estimations of belowground plant biomass are often based on a fixed allometric relationship of plant biomass between aboveground and belowground parts. However, environmental and management factors may affect this allometric relationship making such estimates uncertain and biased. Therefore, we aimed to explore how root biomass for typical cereal crops, catch crops and weeds could most reliably be estimated. Published and unpublished data on aboveground and root biomass (corrected to 0–25 cm depth) of cereal crops (wheat and barley), catch crops and weeds were collected from studies in Denmark. Leave one out cross validation was used to determine... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2018 |
URL: http://orgprints.org/32991/1/Paper%20Published%20Root%20Estimation.pdf |
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| De Notaris, Chiara; Rasmussen, Jim; Sørensen, Peter; Melander, Bo; Olesen, Jørgen E.. |
| Legume-based cover crop (CC) mixtures can increase nitrogen (N) availability in arable systems, reducing the need for external N inputs, as they retain soil N and fix atmospheric N2. However, they need sufficient biomass accumulation to influence soil N availability. Early establishment through undersowing can improve CC growth and plant N accumulation, but competition with the main crop should be minimized. This study aimed to investigate the effect of main crop inter-row spacing (12, 18, 24 cm), manure application (without, with) and CC undersowing (early, late, no cover crop) on N accumulation in a legume-based CC mixture and the residual N effect on the following crop. We conducted a field experiment in Denmark with spring wheat as main crop and spring... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Farm nutrient management. |
| Ano: 2019 |
URL: http://orgprints.org/35015/1/De%20Notaris%202019_cover%20crop%26row%20spacing.pdf |
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| Sørensen, Peter; Khan, A R; Møller, Henrik B.; Thomsen, Ingrid Kaag. |
| Animal manures and plant-based manures are used for biogas production by anaerobic digestion (AD). After AD the concentration of ammonium-N in manure is increased and the concentration of decomposable C is decreased. Thus, the potential first year fertilizer value of the manure can be increased by the treatment. However, pH is also increased by AD thereby increasing the risk of ammonia losses. The objective of this paper was to compare N turnover in soil after application of digested and corresponding undigested manures, and to compare N fertilizer values of digested manures after direct injection or surface-banding in cereals. After AD of pig and cattle slurry the increase in potential plant availability was equivalent to 10-25% of total manure N. AD of... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Composting and manuring; Nutrient turnover; Farm nutrient management. |
| Ano: 2012 |
URL: http://orgprints.org/21820/1/21820.pdf |
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| Thomsen, Ingrid Kaag; Sørensen, Peter. |
| Soil tillage serves a number of purposes such as control of weeds, incorporation of crop residues and manures, and maintenance or improvement of soil mechanical properties, including seedbed preparations. As a side-effect, soil tillage may affect turnover of organic matter (OM) by changing the particle size and spatial distribution of crop and manure residues in soil and by increasing the intimacy of residue/soil contacts. By breaking soil structural elements, tillage may contribute further to N mineralization by exposing physically protected organic matter to microbial turnover. Therefore, adjusting the time, intensity and frequency of soil tillage operations may enable optimization of synchrony, defined as the matching through time of N availability and... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2004 |
URL: http://orgprints.org/4579/1/4579.PDF |
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| Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ambus, Per. |
| This 3-month incubation study showed that ensiled grass-clover was a better nitrogen (N) source than a composted grass-clover and straw mix (grass-clover:straw, 4:1, w:w), owing to the high content of labile compounds compared to the more degraded compost. Our study also indicated that emissions of the strong greenhouse gas nitrous oxide (N2O) can be reduced by incorporating green manure using harrowing instead of ploughing. The silage-derived N release by the end of the incubation was equivalent to 38-42 kg N ha-1, which corresponded to one third of the N applied in silage, with no difference between ploughing and harrowing. In contrast, no net release of mineral N was detected from the composted grass-clover. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Composting and manuring; Nutrient turnover; Air and water emissions. |
| Ano: 2013 |
URL: http://orgprints.org/24520/1/24520.pdf |
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| Carter, Mette S.; Sørensen, Peter; Petersen, Søren O.; Ma, Xiuzhi; Ambus, Per. |
| More efficient use of green manure-derived nitrogen (N) may improve crop yields and reduce environmental impacts in stockless organic arable farming. In this 3-month incubation study, we tested a new strategy where green manure leys are harvested and preserved until the following spring either as compost mixed with straw or as silage of harvested ley biomass. Grass-clover compost or silage was soil-incorporated by either simulated ploughing (green manure placed at 15 cm depth) or harrowing (green manure mixed into the upper 5-cm soil horizon) in order to assess treatment effects on net release of plant-available N, nitrous oxide (N2O) fluxes, and soil respiration. Grass-clover silage provided the highest net N release with similar results for the two... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2014 |
URL: http://orgprints.org/27643/25/Carter%20et%20al.%202014_BFOS.pdf |
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| Registros recuperados: 40 | |
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