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| Løes, Anne-Kristin; Henriksen, Trond Maukon; Eltun, Ragnar; Sjursen, Helge. |
| By restricted access to manure, nitrogen (N) supply in organic agriculture relies on biological N-fixation. This study compares grain yields after one full-season green manure (FSGM) to yields with repeated use of a green-manure catch crop. At two sites in south-eastern Norway, in a simple 4-year rotation (oats/wheat/oats/wheat), the repeated use of ryegrass, clover, or a mixture of ryegrass and clover as catch crops was compared with an FSGM established as a catch crop in year 1. The FSGM treatments had no subsequent catch crops. In year 5, the final residual effects were measured in barley. The yield levels were about equal for grains with no catch crop and a ryegrass catch crop. On average, the green-manure catch crops increased subsequent cereal... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Nutrient turnover; Farm nutrient management. |
| Ano: 2011 |
URL: http://orgprints.org/18531/1/Final_version_March_2011_Repeated_use_of_green_manure_catch_crops.pdf |
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| Pommeresche, Reidun; Hansen, Sissel; Eltun, Ragnar; Korsaeth, Audun. |
| Abstract - Six cropping systems, ranging from conventional arable without livestock to organic livestock farming dominated by ley, have been compared since 1990 in SE Norway. Earthworm density (ED), earthworm biomass (EB), channel density (CD) and species of worms were measured in the topsoil (0-25 cm) in 1994 and 2004. Ley in the crop rotation increased EB, ED and CD in both organic and conventional systems, but a ley proportion higher than 25 % only increased CD. Among the arable systems, the organic system hosted more individuals (ED) and a higher biomass (EB) of earthworms as compared to the conventional systems. The conventional arable systems had low values in 2004, and only minor changes in EB and ED during the period compared with the other... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Pasture and forage crops Cereals; Pulses and oilseeds Soil biology. |
| Ano: 2006 |
URL: http://orgprints.org/7372/1/Pommeresche%2C_Hansen_et_al_JOrganicCong_06.doc |
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| Bakken, Anne Kjersti; Henriksen, Trond; Mangerud, Kjell; Eltun, Ragnar; Riley, Hugh; Fjeld, Tori; Selnes, Svein; Wikmark, Thorbjørn. |
| I fleirårige, fastliggande forsøk på Planteforsk Apelsvoll og Kvithamar undersøker ein kva traktortyngde, pløyedjup og køyremåte ved pløying har å seie for jordstruktur og avlingar i økologisk korndyrking. Etter to år er det framleis ikkje store utslag for forsøksfaktorane. Avhengig av vekst og tildels traktortyngde er det sikre utslag for pløyedjup, men avlingsvariasjonen innan felt og delvis mellom år er stort sett større. Djup pløying gav gjennomgåande større kornavlingar enn grunn pløying, men for bygg etter grønngjødsling på Kvithamar, som verken var tilført husdyrgjødsel eller mineralgjødsel, vart avlingane størst med grunn pløying. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds Soil tillage. |
| Ano: 2005 |
URL: http://orgprints.org/6889/1/gk9_2_bakken_362_367.pdf |
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| Riley, Hugh; Pommeresche, Reidun; Eltun, Ragnar; Hansen, Sissel; Korsaeth, Audunk. |
| Abstract In order to assess long-term effects on productivity, environmental impacts and soil fertility of contrasting farming practices, six cropping systems, ranging from conventional arable without livestock to organic mixed dairy farming with few arable crops, have been compared since 1989 on a loam soil. A decline in soil structure quality was found in a conventional arable system with annual ploughing with no rotational grass. This system had higher bulk density and mean aggregate size than other systems, and lower levels of plant available water and aggregate stability. Opposite trends were related to the proportion of grass leys in the other systems and to their levels of soil organic matter. The latter declined markedly over 15 years in the... |
| Tipo: Journal paper |
Palavras-chave: Soil; Farming Systems; Soil biology. |
| Ano: 2008 |
URL: http://orgprints.org/13474/1/Riley_et_al._2008_AGEE3129.pdf |
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| Løes, Anne-Kristin; Henriksen, Trond M.; Eltun, Ragnar. |
| There is a need for better knowledge of the production potential in organic stockless cereal production systems, and especially how legumes may be used most efficiently in the crop rotation. Field experiments were carried out during 2002-2005 to study biomass production, weed regulation effects, nutrient uptake and cereal yields at two experimental sites. Undersowing of clover is a common practice among organic cereal producers. Hence, crop rotations with four years of continuous undersowing (oats + red clover/wheat + white clover) were compared to rotations where the second year was a green manure ley. The average annual grain yields in the four year period were 25% higher with clover undersowing than in treatments without undersowing, but only 5% higher... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Cereals; Pulses and oilseeds Crop combinations and interactions. |
| Ano: 2006 |
URL: http://orgprints.org/8222/1/gronngjabstract_odense_190406.doc |
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