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| Registros recuperados: 882 | |
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| Stefano, Dr. Canali; Alessandra, Dr. Trinchera; Emanuela, Dr. Di Bartolomeo; Luigi, Dr. Nisini; Anna, Dr. Benedetti; Francesco, Dr. Intrigliolo. |
| In recents years, organic farming is expanding in Southern Italy and in the Mediterranean area, due to interest of consumers and EU agricultural policies. Evaluation of organic farming system introduction on soil quality and fertility status should be taken into account in order to define medium-long term environmental and agricultural strategies, on both locol and national scale. Soil physical, chemical and biological parameters represent effective tools to evaluate soil quality and changes in soil fertility status, as a consequence of different agronomic management (i.e. organic vs coventional). The aim of this work was to compare soil fertility of conventional and organic managed citrus Orchards, using specific soil system descriptors. The research was... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Farm nutrient management; Soil quality; Fruit and berries. |
| Ano: 2002 |
URL: http://orgprints.org/7814/1/Canali_et_al_17_WCSS_%2D_Bangkok.pdf |
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| Chirinda, N.; Kracher, D.; Porter, J.R.; Olesen, J.E.; Petersen, B.M.; Doltra, J.; Kiese, R.; Butterbach-Bahl, K.. |
| Modelling of soil emissions of nitrous oxide (N2O) and carbon dioxide (CO2) is complicated by complex interactions between processes and factors influencing their production, consumption and transport. In this study N2O emissions and heterotrophic CO2 respiration were simulated from soils under winter wheat grown in three different organic and one inorganic fertilizer-based cropping system using two different models, i.e., MoBiLE-DNDC and FASSET. The two models were generally capable of simulating most seasonal trends of measured soil heterotrophic CO2 respiration and N2O emissions. Annual soil heterotrophic CO2 respiration was underestimated by both models in all systems (about 10−30% by FASSET and 10−40% by MoBiLE-DNDC). Both models overestimated annual... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Air and water emissions. |
| Ano: 2010 |
URL: http://orgprints.org/18512/1/Chirinda_et_al_(modelling).pdf |
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| Kristensen, H.L.; Thorup-Kristensen, K.. |
| • Deep roots may be important for uptake of NO3- by annual crops. A field experiment with the deep rooted crop curly kale (Brassica oleracea L. convar. acephala (DC.) Alef. var. sabellica L.) was performed to investigate root distribution and N uptake in deep soil layers. • Root distribution was investigated by use of minirhizotrons and root extractions to 2.4 m depth. The capacity for crop N uptake was studied by deep 15NO3- placement followed by analysis of plant 15N content after 3-30 days. • The atom percent 15N excess (APE) of plant samples was of similar size after uptake of 15N placed at depths in the range of 0.4-2 m. Root colonisation and start of 15N uptake were synchronized in 2.4 m depth. • The deep roots had higher inflow of 15N compared... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Soil biology; Farm nutrient management; Air and water emissions. |
| Ano: 2006 |
URL: http://orgprints.org/7918/1/7918.pdf |
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| Cooper, Julia; Reed, Eleanor Y.; Hörtenhuber, Stefan Josef; Lindenthal, Thomas; Løes, Anne-Kristin; Mäder, Paul; Magid, Jakob; Oberson, Astrid; Kolbe, Hartmut; Möller, Kurt. |
| Maintaining sufficient soil phosphorus (P) levels for non-limiting crop growth is challenging in organic systems since off-farm inputs of P are restricted. This study assessed the status of P on organic farms in Europe using soil test results for extractable P. Data was obtained from published literature, unpublished theses, and various national and regional databases of soil test values. Most of the data (15,506 observations) came from field scale soil tests, but in some cases (1272 observations) values had been averaged across a farm. Farm scale and field scale data were analysed separately and the impact of farm type (arable, dairy, grassland, horticulture, mixed, poultry, unknown) was assessed. Soil test results were assigned to P classes from very low... |
| Tipo: Journal paper |
Palavras-chave: Soil quality; Nutrient turnover; Farm nutrient management. |
| Ano: 2018 |
URL: http://orgprints.org/32707/1/Cooper%20et%20al%202017%20NCAES.pdf |
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| Védie, Hélène. |
| La fertilisation en maraîchage biologique est sans aucun doute encore un vaste domaine à explorer. Le manque de références sur les besoins des cultures d’une part, et sur les possibilités de fournitures du sol par minéralisation d’autre part, amène bien souvent les producteurs à « naviguer à vue » en utilisant des doses standards, qui ne reposent pas sur des bases agronomiques éprouvées. Les suivis réalisés par le GRAB sur aubergine en 2003 et melon en 2004 montrent qu’il est possible de diminuer les doses d’engrais azotés, sans perte de rendement. La marge de manœuvre est très importante en bio, où les fournitures par le sol sont sans doute largement sous-estimées. Des essais de fertilisation en maraîchage biologique sont donc encore nécessaires afin de... |
| Tipo: Report |
Palavras-chave: Nutrient turnover; Composting and manuring. |
| Ano: 2006 |
URL: http://orgprints.org/8721/1/fertilisation_courge.pdf |
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| Timmermans, B.G.H.; Eekeren, N. van. |
| Worldwide the current reserves of phosphate rock are being exhausted. In The Netherlands many former agricultural soils have been enriched by large quantities of phosphorus as a result of fertilization. It is thought that this phosphorus prevents development of target-nature types. Nature organizations currently seek ways to remove it. We tested grassclover, organically managed by local farmers, as a tool to extract excessive soilphosphate from nature areas and reimport it into the mineral cycle agricultural farms. In a small scale experiment we have shown that grassclover with potassium fertilization can remove more than twice the amount of soil phosphate compared to mowing alone. We tested the methodology on 60 ha of grasslands in nature areas and... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Nutrient turnover; Soil. |
| Ano: 2014 |
URL: http://orgprints.org/28300/1/2936.pdf |
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| Die Humusversorgung acker- und gemüsebaulich genutzter Böden nimmt im ökologischen Landbau eine zentrale Stellung ein. Über die Fruchtfolge und den Stickstoffkreislauf sollte in Betrieben eine optimale Humusreproduktion gewährleistet werden, da ein Absinken der Humusgehalte unterhalb tolerierbarer Werte langfristig eine Abnahme der Bodenfruchtbarkeit und der Ertragspotentiale mit sich bringt. Aus verschiedenen Gründen ist es bisher sehr schwierig, den Humusstatus ackerbaulich genutzter Böden einzuschätzen oder Schlussfolgerungen zur Optimierung des betrieblichen Humusmanagements zu ziehen. Die bisher vorliegenden Instrumente zur Analyse der Humusversorgung (Messverfahren, Bilanzmethoden, Simulationsmodelle) wurden fast ausschließlich für die Bedingungen... |
| Tipo: Project description |
Palavras-chave: Nutrient turnover; Composting and manuring; Soil tillage. |
| Ano: 2023 |
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| McNiel, A.M.; Eriksen, J.; Bergström, L.; Smith, K.S.; Marstorp, H.; Kirschmann, H.; Nilsson, I.. |
| A current global trend towards intensification or specialization of agricultural enterprises has been accompanied by increasing public awareness of associated environmental consequences. Air and water pollution from losses of nutrients, such as nitrogen (N) and sulphur (S), are a major concern. Governments have initiated extensive regulatory frameworks, including various land use policies, in an attempt to control or reduce the losses. This paper presents an overview of critical input and loss processes affecting N and S for temperate climates, and provides some background to the discussion in subsequent papers evaluating specific farming systems. Management effects on potential gaseous and leaching losses, the lack of synchrony between supply of nutrients... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2005 |
URL: http://orgprints.org/5470/1/5470.pdf |
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| Eriksen, J.; Hermansen, J.E.. |
| Ved produktion af svin på friland er det almindeligt at have søerne på græs, mens smågrisene ved fravænning sættes på stald med adgang til et betondækket udeareal. Det kan forekomme paradoksalt at en stor del af det økologiske svinekød stammer fra grise, som hovedparten af deres liv ikke har haft mulighed for naturlig adfærd i form af at rode, grave og græsse. Når producenterne vælger ikke at have slagtesvin på friland hænger det blandt andet sammen med en række forventede negative effekter, såsom et stort arealkrav, stor arbejdsbelastning, stort foderforbrug og stort tab af næringsstof til omgivelserne. Der kan imidlertid stilles spørgsmål ved om den indendørs produktion af slagtesvin svarer til forbrugernes forventninger om dyrevelfærd i økologiske... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2005 |
URL: http://orgprints.org/5481/1/5481.PDF |
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| Rasouli, Mrs. Shabnam; Azizi, Prof. Pirouz; Forghani, Dr. Akbar; Asghar Zade, Dr. Ahmad. |
| Mixtures of Zn salts and organic matter have been used successfully in controlling zinc deficiency in various crops. The aim of the present study was to optimize the effectiveness, on zinc availability in maize, of natural organic substances by enriching them with zinc sulfate. For this purpose pod of Phaseolus vulgaris and inner rice husk, as abundant organic wastes in the north of Iran, were incubated with increasing quantities of zinc sulphate. The effect of these zinc-enriched composts, zinc sulphate, and zinc 14% chelate on zinc availability in maize in a calcareous soil was studied in a greenhouse experiment. DTPA-extractable zinc of the soil, total zinc concentration, and chlorophyll of plant leaves were measured. Soil applications of all... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover. |
| Ano: 2008 |
URL: http://orgprints.org/12318/1/Rasouli_12318_ed.doc |
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| Munkholm, Lars J.; Olesen, Jørgen E.. |
| Pakning af underjorden forekommer på en stor del af den dyrkede jord. Særligt er en rodhæmmende pløjesål et udbredt problem. Pakning af underjorden forringer kvantitet og kvalitet af afgrøderne, kan give problemer med færdsel på jorden under våde forhold og har negativ effekt på miljøet fx i form af øget risiko for N udvaskning. Danmarks JordbrugsForskning har i et FØJO-projekt undersøgt effekten af at løsne den rodhæmmende pløjesål i de økologiske sædskifteforsøg på Flakkebjerg og Foulum. |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Soil; Soil quality. |
| Ano: 2004 |
URL: http://orgprints.org/7819/1/7819.PDF |
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| Müller, Torsten; Riehle, Judith; Schlegel, Isabel; Li, Zhifang; von Schenck zu Schweinsberg - Mickan, Mario; Sabahi, Hossein; Schulz, Rudolf. |
| The potential of different plant based organic fertilisers (PBOF) to substitute animal based organic fertilisers (ABOF) in organic vegetable production were investigated in incubation, pot and field experiments. PBOFs have the potential to replace ABOFs. Particularly legume seed meals show fast net N-release even at low soil temperatures. Considerable differences in nitrate contents of vegetables can be found between the different fertilisers although fresh matter and N yields are nearly identical. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Vegetables; Composting and manuring. |
| Ano: 2007 |
URL: http://orgprints.org/9607/1/9607_M%C3%BCller_Vortrag.pdf |
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| van der Burgt, Geert-Jan. |
| Organic agriculture as system approach gains strength if it can produce its own nitrogen, more than what is now realized. This could be done by increased nitrogen fixation on both cattle farms and arable farms, combined with an increased nitrogen use efficiency. Because of these and other reasons, arable farmers can decide to reduce or stop the purchase of manure. Instead of this, cut-and-carry fertilizers could be used. Cut-and-carry fertilizers are alfalfa and grassclover, not sold but used on the farm as fertilizer. This text reports on the design of an arable farm based on the use of alfalfa and grassclover as cut-and-carry fertilizer. This causes a shortage in the P-balance, which is compensated by the purchase of local available compost. The design... |
| Tipo: Report |
Palavras-chave: Nutrient turnover; Farm nutrient management. |
| Ano: 2012 |
URL: http://orgprints.org/21701/1/Stikstofvoorziening_uit_maaimeststoffen__bedrijfsontwerp.pdf |
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| van Eekeren, N.; Murray, P.J.; Smeding, F.W.. |
| In the search for sustainable grassland systems, self-regulating processes in the soil become increasingly important. Soil biota play an important role in these processes and in the provision of various ecosystem services. For grassland systems important ecosystem services are supply of nutrients, soil structure maintenance and water retention. For developing and optimising sustainable grassland systems, insight is needed into the mechanisms by which soil biota are influenced by management and what it means for the functioning of the soil-plant system. Interactions between soil and plants can be represented by a cyclic conceptual framework including plant/roots, soil biota and soil properties. The challenge for sustainable grassland is to allow this cycle... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Soil biology. |
| Ano: 2007 |
URL: http://orgprints.org/11112/1/1931_2.pdf |
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| Timmermans, B.G.H.; Sukkel, Wijnand; Bokhorst, J.G.. |
| Fosfor bevindt zich in anorganische en organische vorm in de bodem. Beide lijken van belang voor plantenvoeding, maar over de verhouding waarin deze bronnen een rol spelen voor akkerbouw op kalkhoudende klei en zavelgronden is nog onvoldoende bekend. De huidige bodemanalyses worden verbeterd, maar er wordt vooral anorganisch fosfaat geanalyseerd. Planten hebben veel mechanismen om fosfaat op te nemen, maar het speelt zich allemaal heel dicht bij de wortel af en de meeste potentieel beschikbare fosfaat is daarom toch niet effectief beschikbaar. De bodemstructuur en beworteling bepalen het deel van de bodem dat toegankelijk is. Verzorging van de bodemstructuur en stimulering van het bodemleven zijn belangrijke maatregelen om bij lage fosfaatniveau ’s te... |
| Tipo: Report |
Palavras-chave: Soil quality; Nutrient turnover; Soil. |
| Ano: 2012 |
URL: http://orgprints.org/26454/1/2760.pdf |
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| Registros recuperados: 882 | |
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