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| Østergård, H.; Kristensen, K.; Pinnschmidt, H.O.; Hansen, P.K.; Hovmøller, M.S.. |
| Abstract For low-input crop production, well-characterised varieties increase the possibilities of managing diseases and weeds. This analysis aims at developing a framework for analyzing grain yield using external varietal information about disease resistance, weed competitiveness and yield potential and quantifying the impact of susceptibility grouping and straw length scores (as a measure for weed competitiveness) for predicting spring barley grain yield under variable biotic stress levels. The study comprised 52 spring barley varieties and 17 environments, i.e., combinations of location, growing system and year. Individual varieties and their interactions with environments were analysed by factorial regression of grain yield on external variety... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Weed management Breeding; Genetics and propagation. |
| Ano: 2008 |
URL: http://orgprints.org/14957/1/14957.pdf |
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| Askegaard, M.; Thomsen, I.K.; Berntsen, J.; Hovmøller, M.S.; Kristensen, K.. |
| In order to obtain a high and stable yield of organic spring barley, production should be optimized according to the specific environment. To test the performance of spring barley varieties under varying cropping conditions, a field experiment was carried out in 2003 and 2004 in a six-field mixed organic crop rotation. We investigated the choice of variety, the order in a rotation,and the application of manure (slurry and farm yard manure; 0 to 120 total-Nha�1) on grain yields of six selected varieties with different characteristics grown in either pure stands or in two spring barley mixtures, each consisting of three varieties. Average grain yield of the barley varieties varied between 3.3 t DM ha-�1 and 4.1 t DM ha-�1. Grain yields of the two... |
| Tipo: Journal paper |
Palavras-chave: Cereals; Pulses and oilseeds. |
| Ano: 2011 |
URL: http://orgprints.org/7853/2/7853.pdf |
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| Østergård, H.; Kristensen, K.; Hovmøller, M.S.; Jensen, J.W.. |
| Despite quite intensive testing of varieties, predictions of future performance of varieties, when grown on specific locations, are known to be nearly impossible; this especially within organic growing systems, where no pesticides and fertilizers can help stabilize yield. Therefore, using mixtures of appropriate varieties might be a way to obtain more stable and acceptable yields. Variety mixtures have so far been studied mostly under conventional farming conditions and focus has often been to characterize disease progress of one pathogen. Here we consider simultaneously four important foliar diseases on spring barley grown in organic as well as conventional growing systems. Further, we study the changes in disease severity of variety mixtures when... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Crop combinations and interactions Breeding; Genetics and propagation Biodiversity and ecosystem services. |
| Ano: 2004 |
URL: http://orgprints.org/8145/1/8145.pdf |
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| Hovmøller, M.S.; Berntsen, J.; Thomsen, I.. |
| Plantesygdomme i økologisk planteproduktion har stor indflydelse på produktkvalitet og udbytte. Specielt i korn er der gode muligheder for at forebygge svampesygdomme ved hjælp af sortsresistens, idet mange års planteforædling har bidraget til at øge niveauet af resistens mod de mest betydende svampesygdomme. Dette gælder bl.a. resistens mod bladsvampe som meldug, bygrust, skoldplet og forskellige bladpletsvampe. En sorts resistensniveau mod en given svampesygdom er imidlertid ikke konstant, men kan ændre sig over tid og have forskellig effekt i forskellige dele af landet. Det skyldes primært forskelle og dynamik i de patogenpopulationer, som forårsager de pågældende sygdomme. Derudover er sygdomsniveauet i den enkelte mark afhængig af det lokale... |
| Tipo: Newspaper or magazine article |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2005 |
URL: http://orgprints.org/7913/1/7913.pdf |
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| Hovmøller, M.S.; Pinnschmidt, H.; Willas, J.; Østergård, H.. |
| Disease assessment is the basis for describing disease resistance characteristics of commercial varieties in national variety lists for all crops where disease is considered a problem. It is well known that ‘disease’ in a specific situation depends on a whole range of interacting hosts, pathogens and environmental conditions. However, the biological complexity conflicts with the wish to express disease resistance characteristics of a variety as a single score per disease. This problem will be illustrated by basic dynamics of growth and senescence of both host and pathogen over time. Disease expressed in terms of absolute diseased leaf area, disease relative to total leaf area or green leaf area will be discussed in general. Two particular problems in... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection Breeding; Genetics and propagation. |
| Ano: 2005 |
URL: http://orgprints.org/8229/1/8229.pdf |
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| Pinnschmidt, H.O.; Hovmøller, M.S.; Østergård, H.. |
| The resistance of spring barley varieties to powdery mildew, leaf rust, leaf scald and net blotch was characterized by using results from inoculated small-plot nurseries and larger survey plots subject to natural infection. The experiments were conducted in different environments. Both trial types often yielded complementary results with respect to the ranking of varieties suggesting that a recommended variety characterization should include both naturally infected survey-type trials and nursery trials in which the most relevant pathogen isolates and/or isolate mixtures or populations are used for inoculation. Average and median values of the diseased leaf area of a variety were highly correlated with each other and with the genotype main effect determined... |
| Tipo: Journal paper |
Palavras-chave: Crop health; Quality; Protection Breeding; Genetics and propagation. |
| Ano: 2006 |
URL: http://orgprints.org/8203/1/8203.pdf |
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| Hovmøller, M.S.; Berntsen, J.; Kristensen, K.. |
| Significant increase in severity of powdery mildew,leaf rust and net blotch with increasing N-content in plant leaves 30 days after germination (all years where the relevant diseases were present at a substantial level). This may explain: · Most of the environmental main effects (field) on disease. · Effect of treatments, i.e., treament 4 resulted in reduced N/increased K content in leaves, which coincided with reduced levels of disease. We observed no clear effect of P, Ca, S, and Zn content in leaves on disease. Micronutrients as Cu, Mo and Mn showed significant effects on powdery mildew in one year but not the other; further interpretation may not be possible due to inter-correlation among the effect of micro-nutrients. The diseases had a... |
| Tipo: Working paper |
Palavras-chave: Crop health; Quality; Protection Farm nutrient management. |
| Ano: 2006 |
URL: http://orgprints.org/7914/1/7914.pdf |
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| Hovmøller, M.S.; Thomsen, I.; Kristensen, K.; Østergård, H.. |
| Bladsygdomme kan være et væsentligt problem både i konventionel og økologisk dyrkning af vårbyg. Der er gode muligheder for at forebygge bladsygdomme ved korrekt sortsvalg, såfremt man lægger vægt på sortens (eller sortsblandingens) resistensegenskaber. Det er således afgørende at kende sortens resistens mod specielt de sygdomme, som har størst sandsynlighed for, baseret på den enkeltes erfaringer, at kunne blive et problem. Udover sortsegenskaber vil sygdomsniveauet for den enkelte sygdom i den enkelte mark afhænge af det lokale smittetryk i begyndelsen af vækstsæsonen, jordens næringsstofbalance- og frigivelse, mikrobiel aktivitet samt vind og vejr. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Crop health; Quality; Protection. |
| Ano: 2006 |
URL: http://orgprints.org/7910/1/7910.pdf |
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