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  • 1
    Electronic Resource
    Electronic Resource
    Surveys of cereal diseases and pests in the Netherlands. 2. Stem-base diseases of winter wheat (1990)
    Springer
    European journal of plant pathology 96 (1990), S. 251-260 
    Details
    ISSN: 1573-8469
    Keywords: Triticum aestivum ; Pseudocercosporella herpotrichoides ; Rhizoctonia cerealis ; Gaeumannomyces graminis ; epidemiology ; weather ; forecasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Samenvatting Een honderdtal percelen wintertarwe werd in 1974–86 jaarlijks op voetziekten geïnventariseerd. In het voorjaar, tijdens het, eerste en tweede knoopstadium van het gewas, was gemiddeld 6% van de spruiten aangetast door oogvlekkenziekte. De intensiteit van de ziekte was hoog in jaren met een hoge gemiddelde wintertemperatuur. Tijdens het melkrijpe stadium, in juli was gemiddeld 13% van de halmen aangetast door oogvlekkenziekte. De aantasting in juli was hoog in jaren met een hoge temperatuur in april en veel neerslag in de maanden maart, april en mei. Met deze gegevens kunnen adviessystemen worden verbeterd. Scherpe oogvlekkenziekte was op gemiddeld 2% van de halmen in juli aanwezig. De ziekte nam geleidelijk met de jaren toe. De jaarlijkse intensiteit was niet gecorreleerd met droge perioden in de herfst, voorjaar of zomer. Symptomen van halmdoder waren op gemiddeld 0.2% van de halmen aanwezig. De intensiteit van de ziekte was hoog in jaren met weinig neerslag in maart, april, mei en juni en met een lage temperatuur in mei en juni.
    Notes: Abstract In the period 1974–1986, ca. 100 commercial winter wheat fields were surveyed annually for stembase diseases. In these years, on average 6% of the tillers was infected with eyespot in spring at the first-second, node stage. Eyespot intensity in spring was high in years with high temperature during winter. Eyespot, intensity in the milky-ripe stage in July, averaged 13% of the culms and was high in years with high temperature in April and high precipitation in March, April and May. These data may improve forecasts. In the milky-ripe stage, 2% of the culms were infected with sharp eyespot, but its intensity has gradually increased during the survey years. No significant correlation of sharp eyespot intensity with dry periods in autumn, spring or summer was found. Symptoms of take-all were found on 0.2% of the stem-bases during ripening. Its intensity was low in years with high precipitation in March, April, May and June and high temperature in May and June.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02000167
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  • 2
    Electronic Resource
    Electronic Resource
    Application of a crop growth model (SUCROS-87) to assess the effect of moisture stress on yield potential of durum wheat in Ethiopia
    Amsterdam : Elsevier
    Agricultural Systems 44 (1994), S. 337-353 
    Details
    ISSN: 0308-521X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0308-521X(94)90226-6
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative aspects of nitrogen nutrition in crops (1991)
    Springer
    Nutrient cycling in agroecosystems 27 (1991), S. 151-160 
    Details
    ISSN: 1573-0867
    Keywords: Nitrogen nutrition ; simulation models ; fertilizer response ; light use efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The processes affecting the response of crops to nitrogen fertilizers are reviewed, with special emphasis on quantitative relationships that enable the development of deterministic models. Total dry matter production is described in terms of length of the growing period and average growth rate, and the effect of nitrogen status of the vegetation on both is discussed. Attention is paid to nitrogen influence on stomatal response and crop water use. It is shown that the effect of differential nitrogen nutrition can in some cases be described in terms of light interception, but not always. It is concluded that the present insight in the relevant processes is insufficient to use deterministic models directly for application in fertilizer practices at the farm level, but that further development of such models is an important aid in structuring thinking about the system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051123
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  • 4
    Electronic Resource
    Electronic Resource
    Surveys of cereal diseases and pests in the Netherlands. 3. Monographella nivalis and Fusarium spp. in winter wheat fields and seed lots (1991)
    Springer
    European journal of plant pathology 97 (1991), S. 105-114 
    Details
    ISSN: 1573-8469
    Keywords: Triticum aestivum ; Microdochium nivale ; Fusarium culmorum ; Fusarium avenaceum ; Fusarium graminearum ; epidemiology ; weather ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Data from surveys of winter wheat fields in the period 1974–1986 and of seed lots in the period 1962–1986 and identifications of diseases on plant samples were compiled to describe the occurrence of snow mould (Monographella nivalis) andFusarium spp. On average,M. nivalis dominated overFusarium spp. The complex ofFusarium spp. constituted mainly ofF. culmorum, followed byF. avenaceum andF. graminearum. M. nivalis was dominant in May on stem-bases and in July on leaves and leaf sheaths. On seedsM. nivalis predominated only in years with low temperatures in July and August. Average brown footrot infection in the field was 4% tillers in May and 5% culms in July. Brown footrot intensity in July was high in cropping seasons with high precipitation in October and with low temperatures in October, November and December. In July during the early eighties, an average of 8% of leaves and 6% of flag leaf sheaths were infected byM. nivalis. Average ear blight incidence was 1.2% glumes infected. Seed contamination by these pathogens averaged 16% in the years 1962–1986. The contamination was high in years with high precipitation in June, July and August. Aspects of cv. resistance and yield loss are illustrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01974274
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  • 5
    Electronic Resource
    Electronic Resource
    Survey of cereal diseases and petts in the Netherlands. 5. Occurrence of Septoria spp. in winter wheat (1992)
    Springer
    European journal of plant pathology 98 (1992), S. 369-376 
    Details
    ISSN: 1573-8469
    Keywords: Triticum aestivum ; Mycosphaerella graminicola ; Phaeosphaeria nodorum ; Stagonospora nodorum ; epidemiology ; weather
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Data of the annual surveys of circa 100 commerical winter wheat fields were compiled to describe epidemics ofSeptoria spp. in the Netherlands during 1974–1986. In May, during the first node stage,S. tritici was dominant whileS. nodorum was virtually absent. In July, during ripening,S. tritici on average dominated overS. nodorum, though in the most continental districts of the countryS. nodorum predominated. In May between 1974 and 1984, on average 56% of the fields showed leaf infections bySeptoria spp., while in July between 1975 and 1986, on average 83% of the fields showed leaf infections. Prevalence ofSeptoria spp. has increased during the surveys. Annual intensity ofSeptoria spp. in winter wheat crops was positively correlated with precipitation and negatively with average monthly sunshine duration during the harvest-month August of the previous growing season. The correlation with sunshine during August could indicate that ascospores play a major role in subsequent epidemics; but whether it is a causal relation remains to be answered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01974464
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  • 6
    Electronic Resource
    Electronic Resource
    Surveys of cereal diseases and pests in the Netherlands. 4. Occurrence of powdery mildew and rusts in winter wheat (1992)
    Springer
    European journal of plant pathology 98 (1992), S. 301-312 
    Details
    ISSN: 1573-8469
    Keywords: Triticum aestivum ; Erysiphe graminis ; Blumeria graminis ; Puccinia striiformis ; P. recondita ; P. graminis ; disease surveys ; epidemiology ; weather ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Results of annual surveys of winter wheat fields from 1974 to 1986 were compiled to describe epidemics of powdery mildew and rusts in relation to weather and cultivar resistance. An average of 29 and 70% of fields were infected by powdery mildew in May and July, respectively. Mildew prevalence in May was positively correlated with average temperature in October and with average temperature over the months December, January, February and March. In addition, it was correlated negatively with the average grade of mildew resistance of the cultivars sown each year. Prevalence of mildew in July did not show consistent correlations with weather characteristics nor with mildew prevalence in May. Yellow rust was usually not detected in May and on average 18% of the fields was infected in July. The occurrence of yellow rust decreased after 1977, when the farmers adopted cultivars resistant or moderately resistant to yellow rust. Brown rust was usually not detected in May, while in July on average 48% of the fields was infected. Brown rust intensity in July was high in years with a high March temperature and high precipitation during April and May. Black rust was rare in the Netherlands, with 3 and 1% of the fields infected in July 1977 and 1981, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01974388
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  • 7
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    Quantitative aspects of nitrogen nutrition in crops (1991)
    Springer
    Details
    Publication Date: 1991-03-01
    Print ISSN: 1385-1314
    Electronic ISSN: 1573-0867
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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  • 8
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    An Agroecological Modeling Approach to Explain ERS SAR Radar Backscatter of Agricultural Crops (1999)
    Elsevier
    Details
    Publication Date: 1999-02-01
    Print ISSN: 0034-4257
    Electronic ISSN: 1879-0704
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Elsevier
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