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  • 1
    Electronic Resource
    Electronic Resource
    Use of soil solarization to improve growth of eucalyptus forest nursery seedlings in Argentina (2000)
    Springer
    New forests 20 (2000), S. 235-248 
    Details
    ISSN: 1573-5095
    Keywords: damping-off ; inoculum potential ; native ectomycorrhizae population ; soil nitrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Damping-off and root rot are major diseases affectingseedlings of Eucalyptus species in forestnurseries in temperate regions in Argentina. The mostcommon fungi associated with these diseases andaffecting the vigor of the root system are Fusarium and Pythium species. Two forestnursery experiments were conducted in the province ofBuenos Aires, Argentina, to determine the effect ofsoil solarization on growth of Eucalyptusviminalis seedlings and relate this effect to thepresence of pathogenic and native ectomycorrhizaepopulations in roots and nutrient availability insoil. Changes in populations of soilborne pathogenswere determined by a bioassay that relates theirpotential to induce disease. Changes in nativeectomycorrhizae were assesed by measuring colonizationlevels in roots. Nutrient availability was determinedby the amount of nitrates released by solarization.Solar heating decreased pathogenic and ectomycorrhizalinoculum potential and increased soil nitrates.Seedling growth in solarized seedbeds may be relatedto a low initial pathogenic population and/or toincreases in nitrate availability. Solarization mayinduce soil suppressiveness against re-establishmentof major seedling pathogens in treated soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006779308611
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  • 2
    Electronic Resource
    Electronic Resource
    Use of Brooks-Corey Parameters to Improve Estimates of Saturated Conductivity from Effective Porosity (1999)
    Springer
    Soil Science Society of America journal 63 (1999), S. 1086-1092 
    Details
    ISSN: 1435-0661
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: K s) using a modified Kozeny-Carman equation. This equation is of the form of a coefficient (B) multiplied by effective porosity raised to a power (n). The purpose of this study was to improve the predictive capability of the modified Kozeny-Carman equation by including information from moisture release curves (soil water content vs. matric potential relation). We fitted the Brooks-Corey (B-C) equation parameters (pore size distribution index and air entry potential) to moisture release data from a large database (〉500 samples). Values of K s were also available from the same source. Inclusion of the pore size distribution index into the Kozeny-Carman equation improved the K s estimation over using only effective porosity, but only slightly. The improvement came through a better estimation of large values of K s. We also fit a relationship for the coefficient (B) of the Kozeny-Carman equation as a function of the two B-C parameters with a constant value of n = 2.5 for the exponent. Overall the use of Brooks-Corey parameters from moisture retention data improved estimates of K s over using effective porosity (φe) alone. There is still considerable error in predicting individual K s values, however. The best forms of the equation was when λ was included in the term for the coefficient for the modified Kozeny-Carman equation. The next best form was when λ was included in the exponent for φe The two best models appeared to better preserve the mean, standard deviation and range of the original data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of night temperature and photoperiod on growth, nodulation and nitrogen fixation inLotus tenuis (1989)
    Springer
    World journal of microbiology and biotechnology 5 (1989), S. 161-167 
    Details
    ISSN: 1573-0972
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Résumé Lotus tenuis a été inoculé avecRhizobium spp. et mis à croître aux trois températures nocturnes, de 17, 21, et 27°C et à deux photo-périodes pour chaque température: des jours courts (SD) de 8 heures de lumière et des jours longs (LD) de 16 heures de lumière. La température nocturne exerce un effet davantage marqué sur la répartition de la matière sèche que sur l'accumulation totale de la matière sèche. La surface foliaire augmente dans le cas des LD bien que l'on trouve moins d'azote par unité de surface foliaire. Dans le cas des SD, de plus grands nombres de feuilles pourraient être liés à un effet de longueur de jours sous dominance apicale, c'est-à-dire en banchement, résultant donc dans la croissance d'une plus grande couronne. La nodulation et la fixation d'azote sont plus grandes dans le cas des SD bien que l'activité spécifique des nodules soit la même, indépendamment des conditions environnementales de croissance. On peut en conclure que le meileur moment de plantation pourLotus tenuis serait l'automne lorsque les jours raccourcissent et que la température est plus basse.
    Notes: Summary Lotus tenuis was inoculated withRhizobium spp. and grown at three different night temperatures (17, 21 and 27°C) and at two different photoperiods for each temperature: short days (SD) of 8-h light and long days (LD) of 16-h light. Night temperature exerted a stronger effect on dry-matter partitioning than of total dry-matter accumulation. Leaf area increased under LD though less N per leaf area was found. A greater number of leaves under SD might be linked to a day-length effect upon apical dominance and hence on branching, thus resulting in a greater crown growth. Nodulation and nitrogen fixation was greater under SD though specific nodule activity was the same regardless of the environmental conditions of growth. It can be concluded that the best planting time forLotus tenuis would be in the autumn when the days are shortening and the temperature is lower.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01741839
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    Paper (German National Licenses)
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