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| Registros recuperados: 13 | |
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| Salonen, Jukka; Hyvönen, Terho; Jalli, Heikki. |
| The composition of the weed flora of dry pea (Pisum sativum L.) fields and cropping practices were investigated in southwestern Finland. Surveys were done in 2002–2003 in 119 conventionally cropped fields and 64 fields under organic cropping. Herbicides were applied to 92% of conventionally cropped fields where they provided relatively good control but were costly. Weeds were controlled mechanically only in five fields under organic production. A total of 76 weed species were recorded, of which 29 exceeded the 10% frequency level of occurrence. The average number of weed species per field was 10 under conventional cropping and 18 under organic cropping. The most frequent weed species in both cropping practices were Chenopodium album, Stellaria media and... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2005 |
URL: http://orgprints.org/16760/1/salonen.pdf |
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| Huusela-Veistola, Erja; Alanen, Eeva-Liisa; Hyvönen, Terho; Kuussaari, Mikko. |
| Short-term rotational fallows, new set-asides and seed mixtures containing specific seed-bearing crops are best alternative to provide seed food for farmland birds (Hyvönen & Huusela-Veistola 2011). The age of set-aside and vegetation structure are more important than seed mixture or plant species richness in supporting insect food for birds, and therefore set asides of various ages are needed (Hyvönen & Huusela-Veistola 2011). Even a short-term fallow sown with a simple seed mixture can encourage populations of generalist predators (Huusela-Veistola & Hyvönen 2006), but longterm set-asides may be even better for natural enemies (Huusela-Veistola 2008). Because of the various species requirements numerous habitats are needed if... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Biodiversity and ecosystem services. |
| Ano: 2011 |
URL: http://orgprints.org/19709/1/huusela.docx |
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| Yli-Viikari, Anja; Risku-Norja, Helmi; Nuutinen, Visa; Heinonen, Esa; Hietala-Koivu, Reija; Huusela-Veistola, Erja; Hyvönen, Terho; Kantanen, Juha; Raussi, Satu; Rikkonen, Pasi; Seppälä, Anu; Vehmasto, Elina. |
| The present work is a proposal of a set of indicators prepared for the Ministry of Agriculture and Forestry. The indicators are to be used in monitoring the implementation of the Ministry's strategy for sustainable use of natural resources. The core of the present work is in setting up an indicator system, which is structured around specific themes. The focus is on the assessment of agricultural and rural development. At the end, an attempt is made to provide a comprehensive picture by considering the mutual inter-linkages between the various indicators. |
| Tipo: Report |
Palavras-chave: Environmental aspects. |
| Ano: 2002 |
URL: http://orgprints.org/11136/1/met5.pdf |
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| Riesinger, Paul; Hyvönen, Terho. |
| Weed communities of organically cropped spring cereal stands in the southern and the northwestern coastal regions of Finland (= south and northwest, respectively) were compared with respect to number of species, frequency of occurrence, density and dry weight. Regional specialization of agricultural production along with differences in climate and soil properties were expected to generate differences in weed communities between south and northwest. Total and average numbers of species were higher in the south than in the northwest (33 vs. 26 and 15.6 vs. 10.0, respectively). Some rare species (e.g. Papaver dubium) were found in the south. Fumaria officinalis and Lamium spp. were found only in the south. The densities and dry weights of Lapsana communis,... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2006 |
URL: http://orgprints.org/17086/1/riesinger.pdf |
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| Salonen, Jukka; Hyvönen, Terho; Jalli, Heikki. |
| The weed flora in conventionally and organically grown spring cereals was investigated in southern and central Finland during 2007–2009. The survey was conducted in 16 regions, 283 farms and 595 fields (72 organically cropped and 523 conventionally cropped fields, of which 503 were treated with herbicides). The occurrence of weeds was assessed in late July–early August. Altogether 148 weed species were identified, of which 128 were broad-leaved and 20 grass species. In organically cropped fields, the average species number per field was 21 and the most frequent species were Chenopodium album 96%, Stellaria media 94%, Viola arvensis 94% and Elymus repens 89%. In conventionally cropped fields, the average species number was 12 and the most frequent weed... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2011 |
URL: http://orgprints.org/19399/1/SALONEN.pdf |
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| Hyvönen, Terho. |
| Elevation in temperatures due to climate change could promote the invasion by C4 weed species of arable fields in the boreal region, which are dominated by C3 crops. The success of Amaranthus retroflexus L. (a C4 weed) in spring barley (a C3 crop) was studied at current and elevated temperatures (3°C difference) in a greenhouse experiment in southern Finland. The competition treatments included no competition and four levels of competition with barley, differing in terms of germination time. The success of A. retroflexus was measured as growth (height and biomass) and seed production (number and biomass). Elevation in temperature enhanced seed production of A. retroflexus, but the impact on growth was minor (only difference in plant height in one... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2011 |
URL: http://orgprints.org/19402/1/hyvonen.pdf |
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| Hyvönen, Terho; Jalli, Heikki. |
| The present study aimed at assessing the invasion of alien weed species in Finland based on a review of their occurrence in the Finnish weed flora. The evaluation was conducted for the three phases of the invasion process, i.e. introduction, naturalization and invasion. The literature review revealed that 815 alien weed species occur in Finland of which 314 are regarded as naturalized. Based on their occurrence in different climate zones, the risk of naturalization of new harmful alien weed species was deemed low for those species not currently found in Finland, but higher for species occurring as casual aliens in Finland. In the latter group, 10 species of concern were detected. Exploration of the distribution patterns of naturalized species within... |
| Tipo: Journal paper |
Palavras-chave: Weed management. |
| Ano: 2011 |
URL: http://orgprints.org/19440/1/hyvonen.pdf |
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| Registros recuperados: 13 | |
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