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  • 1
    Electronic Resource
    Electronic Resource
    Assessing energy of phosphate adsorption and desorption using an integrated Gibbs equation
    Amsterdam : Elsevier
    Geoderma 59 (1993), S. 289-310 
    Details
    ISSN: 0016-7061
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0016-7061(93)90075-V
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nitrogen acquisition and competitive ability of Kalmia angustifolia L., paper birch (Betula papyrifera Marsh.) and black spruce (Picea mariana (Mill.) B.S.P.) seedlings grown on different humus forms (1997)
    Springer
    Plant and soil 195 (1997), S. 209-220 
    Details
    ISSN: 1573-5036
    Keywords: boreal forest ; gross immobilization-mineralization rates ; 15N isotope dilution ; nutrient acquisition ; soil-N cycling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two species of boreal tree seedlings, paper birch (Betula papyrifera Marsh.) and black spruce (Picea mariana (Mill.) B.S.P.), and the ericaceous shrub Kalmia angustifolia L. were grown in pots with humus from a birch-dominated site and two spruce-Kalmia sites. Root systems interacted with humus form in controlling soil-N cycling as well as energy and nutritional deficiencies of soil microorganisms. In general, Kalmia seedlings affected microbial dynamics and N cycling differently than birch and spruce seedlings did. Birch and spruce seedlings reduced gross N mineralization and immobilization rates, soil mineral-N pools and the amounts of NH $$_4^ + $$ –N accreted on buried cation exchange resins in all three soils. Compared to birch and spruce seedlings, the growth of Kalmia resulted in significantly higher gross N mineralization rates, soil mineral-N pools and resin-NH $$_4^ + $$ accretion in soil from the fertile birch site. Gross N immobilization rates in all soils were generally higher with Kalmia than with spruce or birch seedlings. All three species of seedlings acquired N from the birch site soil, whereas only Kalmia seedlings acquired N from the two spruce-Kalmia site soils. Relative to control treatments, the amount of N mineralized anaerobically increased in the birch-site soil and decreased in the poor spruce-Kalmia site soil with all three species of seedlings. All seedlings increased the microbial biomass in the birch-site soil. Kalmia humus and Kalmia root systems increased microbial energy-deficiency and decreased microbial nutritional deficiency compared to the other humus and seedlings used. Results are discussed in terms of each species' nutrient acquisition mechanism and its competitive ability during secondary succession.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004263716346
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Seasonal changes of arbuscular mycorrhizal fungi as affected by tillage practices and fertilization : Hyphal density and mycorrhizal root colonization (1997)
    Springer
    Plant and soil 192 (1997), S. 285-293 
    Details
    ISSN: 1573-5036
    Keywords: arbuscular mycorrhizal fungi ; extraradical hyphae ; manure ; root colonization ; seasonality ; tillage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The influence of tillage practices on native arbuscular mycorrhizal fungi (AMF) was studied in two, consecutive years in eastern Canada, in two 11 year-old long-term tillage-fertilizer experimental field soils, a sandy loam and a clay, growing corn in monoculture. The three tillage practices were: 1) conventional tillage (CT; fall plowing plus spring disking), reduced tillage (RT; spring disking) and no-till (NT). The corn crop received either inorganic (N and K) or organic (liquid dairy manure) fertilizers. Mycorrhizal hyphal density was estimated from soil samples obtained in early spring (before disking), at the 12–14 leaf stage, at silking, and at harvest. The percentage of corn root colonization by AMF at the 12–14 leaf stage, at silking and at harvest was also determined. The sandy loam was sampled over two consecutive seasons and the clay soil over one season. Densities of total and metabolically active soil hyphae, and mycorrhizal root colonization were significantly lower in CT soil than in RT and NT soil. Lowest soil hyphal densities were observed in early spring. The levels of intra- and extraradical fungal colonization always increased from spring to silking and decreased thereafter. Spring disking had only a small and transient negative effect on hyphal abundance in soil. Fertilization did not influence mycorrhizal colonization of corn or abundance of soil hyphae in the sandy loam soil, but in the clay soil metabolically active hyphae were more abundant with manure application than with mineral fertilization. In 1992, in both soils different tillage systems had same grain yield, however, in 1993, corn yield was higher in NT compared to CT system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004205828485
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    Paper (German National Licenses)
    Fulltext
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