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| Registros recuperados: 882 | |
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| Malhi, Sukhdev S.; Brandt, Stewart A.; Zentner, R. P.; Knight, Diane J.; Gill, Kabal S.; Sahota, Tarlok S.; Schoenau, J. J.. |
| Field experiments are underway in Canada to determine the influence of management practices (crop diversity, green manure, legumes) and amendments (Penicillium bilaiae, rock phosphate, elemental S, gypsum, manure, wood ash, alfalfa pellets) on crop yield. In the alternative cropping systems study established in 1995, crop yields for organic system without any chemical input were 30-40% lower than the conventional system with high inputs. But, lower input costs plus price premiums for organic produce normally more than offset lower yields, resulting in favourable economic performance and energy efficiency. Legume, green manure and compost manure helped to replace nutrients lacking in the soil and improved crop yields. In the organic system, amount of P... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover. |
| Ano: 2008 |
URL: http://orgprints.org/11821/1/Malhi_11821_ed |
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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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| Oehl, F.; Frossard, E.; Fliessbach, A.; Dubois, D.; Oberson, A.. |
| Soil organic P (Po) mineralization plays an important role in soil P cycling. Quantitative information on the release of available inorganic P (Pi) by this process is difficult to obtain because any mineralized Pi gets rapidly sorbed. We applied a new approach to quantify basal soil Po mineralization, based on 33PO4 isotopic dilution during 10 days of incubation, in soils differing in microbiological activity. The soils originated from a 20 years old field experiment, including a conventional system receiving exclusively mineral fertilizers (MIN), a bioorganic (ORG) and bio-dynamic (DYN) system. Indicators of soil microbiological activity, such as size and activity of the soil microbial biomass and phosphatase activity, were highest in DYN and lowest in... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Soil biology; Soil quality. |
| Ano: 2004 |
URL: http://orgprints.org/2791/1/Oehl_et_al_2004_SBB_36.pdf |
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| Dresow, Jana F.; Böhm, Herwart. |
| Der vorliegende Beitrag befasst sich mit der Überprüfung der N-Versorgung von Kartoffeln im Ökologischen Landbau mittels zweier Methoden. Zum einen wurde die für den konventionellen Landbau entwickelte Stängelsaftanalyse mittels Nitracheck-Reflektometer angewandt; zum anderen die Blattanalyse mit der Gesamtstickstoffbestimmung mittels CNS-Analysator. Die Messungen zeigen im Verlauf der Vegetationsperiode eine Abnahme sowohl der Nitratgehalte im Stängelsaft als auch der Stickstoffgehalte im Blatt. Diese Abnahme war bei den NO3-Gehalten im Stängelsaft deutlich stärker ausgeprägt als bei den Nt-Gehalten in den Blättern. Es bestehen lineare, aber sortenspezifische Zusammenhänge zwischen den NO3-Gehalten im Stängelsaft und den Nt-Gehalten in den... |
| Tipo: Book chapter |
Palavras-chave: Nutrient turnover; Root crops. |
| Ano: 2010 |
URL: http://orgprints.org/29607/1/Dresow-B%C3%B6hm_2010_LBF-SH335_N-Versorgung-Kartoffel.pdf |
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| Johansen, A.; Pommeresche, R.; Riley, H.; Løes, A.-K.. |
| Anaerobic digestion of animal slurries and plant residues is a valuable technology to produce bioenergy and fertilizers in organic farming systems, while at the same time reducing propagules of weeds and parasites in the input material. However, the digestion changes the quality of the slurry by reducing its content of organic matter and increasing mineral nitrogen (N) levels. This may have profound impact on soil fauna and microorganisms as well as the biogeochemical processes they drive. Organic farmers fear that application of digested materials may have negative implications for soil fertility by reducing the input of organic matter to the soil, compared to fertilizing with traditional animal slurries or green manures. Hence, it is important to gain... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Soil quality; Composting and manuring; Nutrient turnover. |
| Ano: 2013 |
URL: http://orgprints.org/24569/1/24569.pdf |
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| Gebbers, Robin; Kramer, Eckart. |
| Gegenstand war der Erhalt einer optimalen Boden-Acidität im Grünland. Ziele des Vorhabens waren: (i) Entwicklung, Tests und Bewertungen von pH-Sensorsystemen, (ii) Entwicklung von Auswertungsmethoden für die sensorgestützte Bodenkartierung sowie von sen-sorgestützen Entscheidungsunterstützungsalgorithmen zur adaptiven Kalkung, (iii) Ermittlungen der Bodenvariabilität durch Bodensensoren und ihr Zusammenhang mit wesentlichen Eigenschaften des Grünlands. Im Projektverlauf gab es Schwierigkeiten: Budgetkürzungen, Fachkräftemangel, technische Probleme und Schäden, Trockenphasen sowie ein Arbeitsunfall beeinflussten Projektziele und Zeitplanung. Eine Verlängerung und Aufstockung des Projektes kam nicht zustande. Die Ergebnisse wurden nicht voll-ständig... |
| Tipo: Report |
Palavras-chave: Pasture and forage crops; Soil quality; Composting and manuring; Nutrient turnover. |
| Ano: 2017 |
URL: http://orgprints.org/33938/1/33938-12NA031_116-hnee-atb-kramer-2017-hpGreen.pdf |
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| Talgre, Liina; Roostalu, Hugo; Maeorg, Erkki; Lauringson, Enn. |
| In Nordic conditions, soils are frozen during winter, affecting the decomposition rates of crop residues. Hence, the decomposition rates of above- and underground biomass and the dynamics of the N and C released into the soil were studied in trials focused on green manure crops. The decomposition of the residue and N release from the residue varied among the five species of legume tested. There was a marked difference in decomposition rates between shoots and roots, which may also be explained by the differences in the chemical composition of the residue. The shoot residue decomposes rapidly and it serves as a source of N for the subsequent crop. The root residue decomposes more slowly and this had a positive effect in a crop rotation in the second year.... |
| Tipo: Journal paper |
Palavras-chave: Production systems; Nutrient turnover; Farm nutrient management. |
| Ano: 2017 |
URL: http://orgprints.org/35242/1/Talgre_et_al_2017.pdf |
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| Gruber, Harriet; Burmann, Birgit. |
| Die in der vierten Rotation befindliche Fruchtfolge am Standort Gülzow wurde seit 1992 ökologisch bewirtschaftet. Die Fruchtfolge hat sich geringfügig verändert und umfasst derzeit 33 bzw. 50 % Leguminosen und wurde wie ein viehhaltender Betrieb mit 0,6 - 0,8 GV/ha bewirtschaftet. Während des Beobachtungszeitraumes wurden jährlich Grundnährstoffgehalte, pH-Werte und der C- und Nt-Gehalt im Boden bestimmt. Die Effizienz der Nährstoffverwertung liegt zwischen 70 und 90 %. In der Folge bewegen sich die Nährstoffgehalte im Boden auf hohem Niveau im Bereich der Gehaltsklassen C und D. Der pH-Wert nahm in den letzten Jahren kontinuierlich bei zunehmender Differenzierung zwischen den Schlägen ab. Positive Humusbilanzen führten zu steigenden C-Gehalten im Boden.... |
| Tipo: Newspaper or magazine article |
Palavras-chave: Crop combinations and interactions; Nutrient turnover. |
| Ano: 2015 |
URL: http://orgprints.org/29704/1/Entw.%20N%C3%A4hrstoff-%20und%20Humusg._Gruber.pdf |
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| Marchetti, Rosa; Lazzeri, Luca; Malaguti, Lorena; Orsi, Anna; Ponzoni, Gilda. |
| Biofumigant crops used as green manure, in addition to producing a biocidal effect on some soil-borne pathogens and pests, could represent a source of N for crop nutrition. In two laboratory experiments we compared i) the potentially mineralizable N (PMN) of a silty clay soil after incorporation of glucosinolate-containing (GLS+) and non-containing (GLS–) plants, or after incorporation of metam sodium; and ii) the mineralization rate of different types of soils (silty clay, loam and loamy sand) after green manuring with GLS+ crops. After a 3-month incubation, the PMN of the silty clay soil amended with the GLS+ Brassica juncea was significantly higher than the unamended control and the soil amended with Triticum aestivum and Eruca sativa. Metham sodium,... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Composting and manuring. |
| Ano: 2008 |
URL: http://orgprints.org/11969/1/Marchetti_11969_ed.rtf |
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| Raupp, Dr Joachim; Oltmanns, Meike. |
| In a long-term fertilization trial particulate organic matter (POM) was investigated after 20 years of farmyard manure vs. mineral fertilization at different levels with the method of Meijboom et al. (1995). The organic matter was separated with sodium polytungstate (Magid et al., 1996; Six et al., 1999) into a light (p <1.13 g cm-3), medium (1.13-1.37 g cm-3) and heavy (p >1.37 g cm-3) fraction. The organically fertilized plots had lower contents of the light fraction (0.73 - 0.78 g kg-1 dry matter on average of all fields) compared to the mineral treatment (0.95 g kg-1 TS). This gives a hint that organic residues are decomposed faster in the manure fertilized soil, according to the higher biological activity found earlier in this treatment. The... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Nutrient turnover; Soil biology; Composting and manuring. |
| Ano: 2002 |
URL: http://orgprints.org/770/1/rai02po.pdf |
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| Das Forschungsvorhaben hat zum Ziel, den Effekt der Phosphorversorgung auf die Zusammensetzung von Pflanzenbeständen des ökologisch bewirtschafteten Grünlandes unter besonderer Berücksichtigung der Grünlandleguminosen, deren Funktionalität und der Phytodiversität zu bemessen. Zu diesem Zweck werden auf artenreichen Grünlandflächen ausgewählter Standorttypen (Salzgrasland, Niedermoorgrünland, Moränengrünland) Felderhebungen durchgeführt, welche auf die Bemessung des skalenabhängigen Einflusses unterschiedlicher P-Trophiezustände auf die Präsenz der Grünlandleguminosen (insb. Trifolium repens) sowie die der weiteren Bestandesbildner ausgerichtet sind. Auf Grundlage dieser sowie weiterer Daten soll versucht werden, Schwellenwerte für die Versorgung der... |
| Tipo: Project description |
Palavras-chave: Pasture and forage crops; Nutrient turnover; Biodiversity and ecosystem services. |
| Ano: 2023 |
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| Uusitalo, Risto; Turtola, Eila; Grönroos, Juha; Kivistö, Juhani; Mäntylahti, Väinö; Turtola, Ari; Lemola, Riitta; Salo, Tapio. |
| Soil test phosphorus (P) concentration has a major influence on the dissolved P concentration in runoff from agricultural soils. Thus, trends in soil test P partly determine the development of pollution potential of agricultural activities. We reviewed the changes of soil test P and P balances in Finnish agriculture, and assessed the current setting of P loss potential after two Agri-Environmental Programs. Phosphorus balance of the Finnish agriculture has decreased from +35 kg ha–1 of the 1980’s to about +8 kg P ha–1 today. As a consequence, the 50-yr upward trend in soil test P concentrations has probably levelled out in the late 1990’s, as suggested by sampling of about 1600 fields and by a modelling exercise. For the majority of our agricultural soils,... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover. |
| Ano: 2007 |
URL: http://orgprints.org/17083/1/uusitalo.pdf |
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| Zhao, Jin; De Notaris, Chiara; Olesen, Jørgen E.. |
| Nitrate leaching losses from arable cropping systems cause severe damages to the environmental services worldwide. There is a considerable need for methods that allow rapid, easy and area covering detection of nitrate leaching to guide N management. We used three years of data from the 5th cycle of a long-term crop rotation experiment in Denmark to quantify the relationships between nitrate leaching in autumn and winter and field conditions in autumn as defined by three vegetation indices [VIs; Ratio Vegetation Index (RVI), Normalized Difference Vegetation Index (NDVI), Ratio Red Edge (RRE)] in autumn. Following cereal crops, catch crops significantly reduced nitrate leaching in autumn and winter, whereas this was only the case for one out of the three... |
| Tipo: Journal paper |
Palavras-chave: Nutrient turnover; Air and water emissions; Farm nutrient management. |
| Ano: 2019 |
URL: http://orgprints.org/35137/1/Manuscript-20190324.pdf |
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| Registros recuperados: 882 | |
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