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Registros recuperados: 15
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Anaerobically digested green manure is a valuable fertilizer Organic Eprints
De Notaris, C.; Sørensen, P.; Møller, H.B.; Wahid, R.; Eriksen, J..
Anaerobic digestion of green manure increases nitrogen (N)availability. However, the N fertilizer replacement value is affected by the initial quality of the green manure, which is related to plant species composition and cutting frequency.
Tipo: Newspaper or magazine article Palavras-chave: Crop combinations and interactions; Nutrient turnover.
Ano: 2018 URL: http://orgprints.org/34982/1/Anaerobically%20digested%20green%20manure%20is%20a%20valuable%20fertilizer_34982.pdf
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Barriers for developing more robust organic arable farming systems in practice Organic Eprints
Noe, E.; Sørensen, P.; Melander, B.; Olesen, J.E.; Fog, E..
There is a gap between the scientific idea of robust and economically viable organic arable farming systems with optimized crop rotations for nutrient and pest management and how these systems look like in practice. In order to explore this gap, we visited and interviewed ten organic arable farms in Denmark. Our main findings are: 1) Organic arable farming operates in a very dynamic and changing environment in terms of prizing and market opportunities, and the main focus of the farm managements was the coping strategy within this changing environment; 2) The farming systems were continuously changing and developing, buying and renting more land, changing manure agreements and other forms of cooperation and arrangements; 3) Short term profit was paid much...
Tipo: Conference paper, poster, etc. Palavras-chave: Markets and trade; Research communication and quality.
Ano: 2013 URL: http://orgprints.org/24578/1/24578.pdf
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CN-SIM - a model for the turnover of soil organic mattter. II: Short term carbon and nitrogen development Organic Eprints
Petersen, B.M.; Jensen, L.S.; Berntsen, J.; Hansen, S.; Pedersen, A.; Henriksen, T.M.; Sørensen, P.; Trinsoutrot, I..
A computer model is presented, which describes the transformations of C and N in the soil. The development has been divided into two interdependent tasks, the first being development of long-term SOC simulation capabilities, and the second being short-term simulations of C and N, as described in this paper. A number of existing, independent laboratory experiments, covering a range of amendments, have been used for this task. The amendments includes a variety of different crop residues and animal manure. These experiments have included measurements of 13C, 14C and 15N in various pools, and the model facilitates the simulation of these isotopes. Non-linear, automated optimisation procedures were utilised wherever feasible. The model generally yielded good...
Tipo: Journal paper Palavras-chave: Nutrient turnover.
Ano: 2005 URL: http://orgprints.org/88/1/88.pdf
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Contribution of feeds from range in organic broiler production Organic Eprints
Steenfeldt, S.; Horsted, K.; Sørensen, P..
A study with organic broilers with access to a large range area with herbs was performed and the effect of three broiler genotype (JA757, T851, SU51) with different growth rates and different feeding strategies (HP vs LP) on the animals' feed intake, growth and welfare was investigated. The results so far indicate that feed intake from range and animal welfare is dependent on type of allocated feed and growth rate of the broiler genotype. Thus, gait scores and foot and plumage condition showed that the fastest growing broiler genotype had some problems when fed normal broiler feed, whereas this was not the case for the other genotypes. The fastest growing broilers also ate more pelleted broiler feed compared to the slower growing breeds, which in contrast...
Tipo: Journal paper Palavras-chave: Feeding and growth; Breeding and genetics; Health and welfare; Poultry.
Ano: 2015 URL: http://orgprints.org/28908/3/28908.pdf
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Contribution of feeds from range in organic broiler production Organic Eprints
Steenfeldt, S.; Horsted, K.; Sørensen, P..
A study with organic broilers with access to a large range area with herbs was performed and the effect of three broiler genotype (JA757, T851, SU51) with different growth rates and different feeding strategies (HP vs LP) on the animals' feed intake, growth and welfare was investigated. The results so far indicate that feed intake from range and animal welfare is dependent on type of allocated feed and growth rate of the broiler genotype. Thus, gait scores and foot and plumage condition showed that the fastest growing broiler genotype had some problems when fed normal broiler feed, whereas this was not the case for the other genotypes. The fastest growing broilers also ate more pelleted broiler feed compared to the slower growing breeds, which in contrast...
Tipo: Proceedings Palavras-chave: Health and welfare; Poultry.
Ano: 2014 URL: http://orgprints.org/27352/1/Abstract%20EPC2014-final.pdf
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Estimating nitrogen supply and cereal crop yield in organic crop production Organic Eprints
Olesen, Jørgen E.; Sørensen, P..
Hitherto it has been difficult for farmers to predict the effects of various sources of nitrogen (N) supply in organic farming, since these vary greatly in quality and thus in effect on crop yield. This has limited the planning of organic farming crop rotations and the application of manure and other mobile N sources to the crops, since the effect on crop yield would not easily be estimated. Here we used data from long-term organic crop rotation experiments in Denmark to determine the contribution of various N sources to yield of winter wheat and spring barley. The results showed consistent effects of N in soil organic matter, in organic matter applied to soils, in catch crops, in applied manure and of weed pressure. This opens the possibility for building...
Tipo: Conference paper, poster, etc. Palavras-chave: Crop combinations and interactions Cereals; Pulses and oilseeds Farm nutrient management.
Ano: 2013 URL: http://orgprints.org/24548/1/24548.pdf
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Genetic Improvement of Livestock for Organic Farming Systems Organic Eprints
Boelling, D.; Groen, A.F.; Sørensen, P.; Madsen, P.; Jensen, J..
Organic farming which experienced a constant rise over the last two decades is a system based on sustainability and on a concept tending towards functional integrity. Legislation as well as the wish to produce separately from conventional farming raise the question whether organic farming should be conducted completely apart from conventional farming or not. This paper discusses the aspects that affect animal breeding under these circumstances, e.g., maintaining genetic diversity by using local breeds and possible G×E interactions which might occur when breeds adapted to conventional farming systems are used in organic farming. Ways of modelling G×E are presented, moreover examples of G×E in dairy cattle, swine, and poultry are given. Trends in selection...
Tipo: Journal paper Palavras-chave: Breeding and genetics.
Ano: 2003 URL: http://orgprints.org/1343/1/livestock_Boelling.pdf
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Integrated nitrogen input systems in Denmark Organic Eprints
Olesen, J.E.; Sørensen, P.; Thomsen, I.K.; Eriksen, J.; Thomsen, A.G.; Berntsen, J..
Cycling of N in agriculture through the use of mineral fertilizers, manures and N-fixing crops gives rise to many forms of N emissions to the environment, including nitrate (NO3) leaching, ammonia (NH3) volatilization and nitrous oxide (N2O) emissions, resulting in ground water pollution, eutrophication of surface waters, soil acidification and contributions to global warming. The high rates of N input in intensive North European agricultural systems have given rise to high loss rates, and the focus in Danish agriculture during the past two decades has been on increasing the N use efficiency with the aim of reducing losses. The N use efficiency at the system level can be increased by improved handling of manure, targeted application of fertilizers and...
Tipo: Book chapter Palavras-chave: Nutrient turnover.
Ano: 2004 URL: http://orgprints.org/4668/3/4668.pdf
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Interactions between soil organic matter level and soil tillage in a growing crop: N mineralization and yield response Organic Eprints
Thomsen, I.K.; Sørensen, P..
Effects of organic matter management and soil loosening on the synchrony between soil N mineralization and crop N demand were studied in a field experiment. Four different levels of organic matter (OM) were applied to a crop rotation during 12 years by various applications of animal manure, straw incorporation and catch crop growing. A spring barley crop was grown to test the influence of the previous OM applications. Soil loosening with a row cultivator was carried out one, two or three times in the first part of the growth season to examine the potential for adjusting soil N mineralization by soil tillage in cropping systems with different OM input. Immediately before each of the soil loosenings and again after one, two and three weeks, plant biomass and...
Tipo: Journal paper Palavras-chave: Nutrient turnover.
Ano: 2006 URL: http://orgprints.org/4585/1/4585.doc
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Legume-based catch crops inprove N-supply without increasing the N2O emission Organic Eprints
Li, X.; Sørensen, P.; Petersen, S.O.; Olesen, J.E..
Legume-based catch crops (LBCCs) may be an important source of nitrogen (N) in organic crop rotations since they are capable of taking up N both from the soil and from the atmosphere via biological N fixation (BNF). Consequently, they may help improve the crop yield through enhancing soil fertility and crop N supply. On the other hand, the legume-based catch crops may also have a negative impact on the climate as they may enhance the emissions of nitrous oxide (N2O), which is a powerful greenhouse gas. Therefore, the findings from two research projects HighCrop (Organic RDD 2) and Legume Future (EU-FP7) are promising, as they show that a higher level of N2O emission is not necessarily the consequence of growing LBCC.
Tipo: Web product Palavras-chave: Composting and manuring; Nutrient turnover.
Ano: 2015 URL: http://orgprints.org/28938/1/28938.pdf
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Nitrogen fertilizer replacement value of digestates from three green manures Organic Eprints
De Notaris, C.; Sørensen, P.; Møller, H.B.; Wahid, R.; Eriksen, J..
Green manure mixtures including legumes and forbs can help to increase N availability in organic arable systems. Anaerobic digestion of green manures may provide ammonium rich digestate, which can be redistributed as fertilizer. The aim of this study was to investigate the effect of plant species composition, cutting strategy and anaerobic digestion on the N fertilizer replacement value (NFRV) of different green manures. Digestates obtained from silages of pure stand lucerne (four cuts/year) and a mixture including lucerne, grass and forbs (two or four cuts/year) were used to fertilize winter wheat (surface banding) and spring barley (injection). In general, NFRV was 46–173% higher in spring barley than winter wheat, due to the different application method...
Tipo: Journal paper Palavras-chave: Crop combinations and interactions; Nutrient turnover.
Ano: 2018 URL: http://orgprints.org/34971/1/10.1007_s10705-018-9951-5.pdf
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Nitrogen use efficiency of 15N-labelled sheep manure and mineral fertiliser applied to microplots in long-term organic and conventional cropping systems Organic Eprints
Bosshard, C.; Sørensen, P.; Frossard, E.; Mayer, J.; Mäder, P.; Nanzer, S.; Oberson, A..
Nitrogen (N) utilisation by crops has to be improved to minimize losses to the environment. We investigated N use efficiency of animal manure and mineral fertiliser and fate of fertiliser N not taken up by crops in a conventional (CONMIN) and a bioorganic (BIOORG) cropping system of a long-term field experiment over three vegetation periods (winter wheat–soybean–maize). Microplots planted with wheat received a single application of 15N-labelled slurries (either urine or faeces labelled) or mineral fertiliser. At the end of each vegetation period we tested whether higher microbial activity and larger microbial biomass in BIOORG than CONMIN soils, and lower long-term N input level in BIOORG, affected use efficiency and fate of fertiliser N not taken up by...
Tipo: Journal paper Palavras-chave: Soil.
Ano: 2009 URL: http://orgprints.org/26369/1/Bosshard_etal_2009_NCA83.pdf
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Radrensninger i efterafgrøder kan begrænse rodukrudt Organic Eprints
Bertelsen, I.; Nielsen, E.E.; Sørensen, P..
Nyt dyrkningssystem til korn og bælgsæd gør det muligt både at radrense og etablere kvælstofsamlende efterafgrøder i vækstsæsonen og at stoppe rodkrudt med radrenser efter høst uden at skade efterafgrøden.
Tipo: Newspaper or magazine article Palavras-chave: Cereals; Pulses and oilseeds Buildings and machinery Weed management.
Ano: 2015 URL: http://orgprints.org/28972/1/28972.pdf
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Starfish (Asterias rubens) as feed ingredient for piglets Organic Eprints
Sørensen, P.; Nørgaard, J.V..
tThe effects of including starfish meal (SM) as an alternative protein source in diets for pigletson performance, faeces characteristics and plasma parameters were investigated. Four dietswere formulated to contain different protein sources: fish meal (FM), extruded soybeanmeal (ESBM) and two levels of SM (SM50 and SM100). All diets contained 174.4 g soybeanmeal/kg feed and were supplemented by up to 166-172 g standardised ileal digestible crudeprotein/kg feed with either FM, ESBM, SM or a combination giving rise to two SM + ESBMdiets with different levels of SM and ESBM. One wk after weaning, 96 pigs with a bodyweight of 9.6 ± 0.4 kg were housed individually and allocated to one of the four diets (n = 24)and fed ad libitum for a 14 d period. Average daily...
Tipo: Journal paper Palavras-chave: Feeding and growth.
Ano: 2016 URL: http://orgprints.org/32388/1/ANIFEE%202016%20starfish%20for%20pigs%20211%20p181-188.pdf
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Tillage-induced N mineralization and N uptake in winter wheat on a coarse sandy loam Organic Eprints
Thomsen, I.K.; Sørensen, P..
The potential of adjusting soil N mineralization by soil tillage in the growing season was investigated in winter wheat on a coarse sandy loam. In two succeeding years, wheat was sown at 25 cm row spacing on plots where four different organic matter (OM) management strategies regarding pig slurry application, straw incorporation and catch crop growing had been applied for the previous 13 years. Soil tillage was carried out in spring with a row cultivator, a PTO-driven row rotovator or a brushweeder. Soil inorganic N content was determined in tilled and undisturbed soil during four weeks after tillage. In the first experimental year, gross nitrogen transformation rates were measured by 15N pool dilution techniques in row rotovated soil and in undisturbed...
Tipo: Journal paper Palavras-chave: Nutrient turnover.
Ano: 2006 URL: http://orgprints.org/4578/1/4578.doc
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