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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Nutrient cycling in agroecosystems 16 (1988), S. 3-13 
    ISSN: 1573-0867
    Keywords: dicalcium orthosilicate ; calcium metasilicate ; mini-granulation ; extractable Si ; Si in saturation extract ; Oxisol ; Andept
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Silicate materials, dicalcium orthosilicate (Ca2SiO4), calcium metasilicate (CaSiO3), and mini-granulated CaSiO3, were incorporated into three highly weathered, low-Si soils. The mixtures were moistened to field moisture-holding capacity and incubated in plastic bags for 60 days at approximately 25°C, after which Si was extracted. Application rates of silicate materials were 0, 460, 920, and 1380 mg Si per kg soil. Two ranges of particles sizes, 0.25 to 0.84 mm and 0.074 to 0.15 mm CaSiO3 and Ca2SiO4 were compared. The soils were a Typic Gibbsiorthox, pH 4.6; a Humoxic Tropohumult, pH 4.2; and a Typic Hydrandept, pH 5.0. Materials were evaluated by four extraction procedures: shaking in water, water displacement from saturated soil, shaking in ammonium acetate solution, and biologically by roots of sugarcane (Saccharum Spp. hybrid). Silicate from the CaSiO3 materials were generally more readily extracted chemically and biologically than silicate from the Ca2SiO4. Solubility and availability of Si usually increased as primary particle size of the silicate materials decreased. The exceptions were associated with the most acid (pH 4.2) Ultisol. Mini-granulation did not reduce the effectiveness of CaSiO3 thus confirming agronomic feasibility of mini-granulation. Plant uptake of Si was most closely related to water-extractable soil Si, followed by Si in saturation extracts and then by NH4 OAc-extractable Si.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 81 (1984), S. 165-176 
    ISSN: 1573-5036
    Keywords: Avocado ; Ca ; Mn ; Oxisol ; P ; pH ; Phytophthora root rot ; Soil water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary This experiment employed a factorial design combining 4 soil pH levels, 3 soil moisture levels, with and without the addition ofPhytophthora cinnamomi to the soil to evaluate the conditions that lead to Phytophthora root rot of avocado. An inverse relation between soil pH and leaf production (and root-weight) was observed in nondiseased plants. In soil infested withP. cinnamomi, plant growth and root weights were much depressed by low soil pH, and especially by low soil pH coupled with high soil moisture contents. These interactions were statistically highly significant. Root weights in pots withP. cinnamomi were closely related to the incidence of disease. A disease index was used to visually assess the conditions of roots. Isolation of the pathogen from diseased plant roots confirmed the accuracy of the disease index. A process of elimination suggsts that favorable soil Ca level and not high pHper se was responsible for disease suppression and that the devastating effects of low soil pH was produced by high Mn (and possibly Al) and associated low levels of Ca and P in soil solutions, which led to breakdown of biological control mechanisms.
    Type of Medium: Electronic Resource
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