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  • 1
    Electronic Resource
    Electronic Resource
    Long-term greenhouse evaluation of partially acidulated phosphate rock fertilizers (1987)
    Springer
    Nutrient cycling in agroecosystems 13 (1987), S. 31-44 
    Details
    ISSN: 1573-0867
    Keywords: Partially acidulated phosphate rock ; P uptake ; lucerne ; phosphoric acid ; sulfuric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Twelve granular partially acidulated phosphate rock (PAPR) fertilizers were compared with unacidulated phosphate rocks (PR) and superphosphate at five rates of total P in the presence and absence of supplementary sulfate and plant residue recycling treatments in a long-term green-house experiment with lucerne (Medicago sativa L., cv. CUF101). The PAPRs were prepared from two PRs (Christmas Is. A grade and Duchess, Queensland) and acidulated at two rates (25% and 50% on an H2SO4 to single superphosphate basis) with either H2SO4 or H3PO4. Six harvests (each bulked from three cuttings) were collected over a 2-year period. It was generally found that lucerne response to PAPRs depended closely on their water-soluble plus citrate-soluble P contents which increased with increased degree of acidulation. The H3PO4 tended to yield more soluble P on acidulation of PR than H2SO4 and acidulation of Christmas Is. PR yielded more soluble P than did acidulation of Duchess PR. There was little evidence for enhanced availability of P due to action of the triple point solution in hydrolyzing granules on residual PR in those granules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049800
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  • 2
    Electronic Resource
    Electronic Resource
    Long-term greenhouse evaluation of partially acidulated phosphate rock fertilizers (1987)
    Springer
    Nutrient cycling in agroecosystems 13 (1987), S. 45-54 
    Details
    ISSN: 1573-0867
    Keywords: Biosuper ; elemental sulfur ; Lucerne ; partially acidulated phosphate rock ; P uptake ; S uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of cogranulation with elemental sulfur (S) on the availability of phosphorus (P) from partially acidulated phosphate rock (PAPR) prepared from Christmas Island or Duchess phosphate rock (PR) was studied as part of a larger experiment examining factors affecting the agronomic effectiveness of PAPR sources. PAPRs cogranulated with (10% w/w) or without elemental S were compared at four rates of P (excluding controls) in the presence and absence of supplementary sulfate (SO4) from gypsum on a P-deficient pasture soil with no previous history of elemental S applications. Lucerne (Medicago sativa L., cv. CUF101) yields and P and S uptake were determined in six bulked harvests collected over a 2-year period. Large responses to P rates were recorded but only minor and inconsistent responses to SO4-S occurred during the experiment. In contrast, elemental S in PAPR granules resulted in greater lucerne yields and P and S uptake by lucerne tops; these effects, which did not appear until 6 months after application, were attributed to the acidulation of residual PR in PAPR granules by action of H2SO4 produced by the oxidation of elemental S. These effects increased with increasing rates of PAPR applied and were greater for the Christmas Island PAPRs and at the 50% acidulation rate. This was attributed to the development of a more prolific root system at the higher P rates and the higher levels of soluble P provided by 50% PAPRs which enabled plants to more fully exploit P solubilized from S-granulated PAPR products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049801
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  • 3
    Electronic Resource
    Electronic Resource
    Nutrient release from decomposing foliar litter of three tree species with spicial reference to calcium, magnesium and potassium dynamics (1988)
    Springer
    Plant and soil 110 (1988), S. 49-55 
    Details
    ISSN: 1573-5036
    Keywords: Acer rubrum ; calcium ; cations ; Cornus florida ; decomposition ; litter ; magnesium ; nitrogen ; nutrient release ; phosphorous ; potassium ; Quercus prinus ; sulfur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Calcium, magnesium and potassium dynamics in decomposing litter of three tree species were measured over a two-year period. The speices studied were flowering dogwood (Cornus florida), red maple (Acer rubrum) and chestnut oak (Quercus prinus). The order of decomposition was:C. florida〉A. rubrum〉Q. prinus. Calcium concentrations increased following any initial leaching losses. However, there were net releases of Ca from all three litter types since mass loss exceeded the increases in concentration. Net release of Ca by the end of two years from all three species combined was 42% of initial inputs in litterfall. Magnesium concentrations increased in the second year, following decreases due to leaching during the first year inC. florida andA. rubrum litter. Net release of Mg by the end of two years was 58% of initial inputs. Potassium concentrations decreased rapidly and continued to decline throughout the study. Net release of K by the end of two years was 91% of initial inputs. These data on cation dynamics, and similar data on N, S and P dynamics from a previous study, were combined with annual litterfall data to estimate the release of selected nutrients from foliar litter of these tree species at the end of one and two years of decomposition. The relative mobility of all six elements examined in relation to mass loss after two years was; K〉Mg〉mass〉Ca〉S〉P〉N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02143538
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  • 4
    Electronic Resource
    Electronic Resource
    Long-term greenhouse evaluation of partially acidulated phosphate rock fertilizers (1991)
    Springer
    Nutrient cycling in agroecosystems 29 (1991), S. 295-307 
    Details
    ISSN: 1573-0867
    Keywords: Partially acidulated phosphate rock ; P uptake ; relative agronomic effectiveness ; substitution value ; superphosphate ; yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The agronomic effectiveness (yield and P uptake) of twelve granular, partially acidulated phosphate rock fertilizers (PAPR) and two finely ground, unacidulated phosphate rocks (PR) were compared to that of a single superphosphate in a long-term greenhouse experiment with lucerne (Medicago sativa L., cv. CUF101), grown in a low P sorbing, moderately acid, sandy loam soil of moderate P status (Paleustaf). The PAPRs were prepared from two unreactive PRs (Christmas Is. ‘A’ grade and Duchess rock from Queensland) and acidulated at two rates (25% and 50% on a H2SO4 to single superphosphate basis) with either H2SO4 or H3PO4. Additional products included H2SO4 PAPRs cogranulated with elemental S (10% w/w). Superphosphate was consistently superior to all PRs and PAPRs in agronomic effectiveness throughout this two-year study. The most effective of the PAPRs were those that were 50% acidulated with H2SO4 and cogranulated with elemental S; this type of fertilizer from both rocks was approximately 2/3 as effective as superphosphate when relative agronomic effectiveness indices (RAE) were calculated from cumulative yields. The increase in agronomic effectiveness relative to superphosphate (RAE value) by the partial acidulation of the PR could be attributed to its effect of increasing the P solubility in the PAPR. A curvilinear relationship existed between the RAE values of PRs and PAPRs, measured from cumulative yield or P uptake data, and the percentage of the total P in each fertilizer that was in a soluble (water + citrate soluble) form. Cogranulation with elemental S (10% w/w) significantly displaced this relationship upwards by increasing the RAE of H2SO4 PAPRs by more than 50%. The maximum cumulative recovery of applied P by lucerne tops after five bulked harvests (fifteen consecutive harvests) was 61.5%, which occurred at the low application rate of superphosphate. The decline in the substitution value of PRs for superphosphate, that occurred with increasing P rates tended to be offset both by increasing the level of acidulation and by cogranulating the PAPR with elemental S.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052399
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  • 5
    Electronic Resource
    Electronic Resource
    Modelling of sulfur oxidation from elemental sulfur (1993)
    Springer
    Plant and soil 155-156 (1993), S. 379-382 
    Details
    ISSN: 1573-5036
    Keywords: elemental sulfur ; modelling ; oxidation ; sulfur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract An elemental S oxidation model has been developed which combines a maximum S release rate with modifiers for temperature and soil moisture conditions. This model has been combined with a pasture growth and CNSP nutrient cycling model to match S oxidation rate to pasture S demand. In two Southern Australian enviroments, 100μm elemental S was superior to 200μm particles whilst in Northern Australia the 200μm particles were superior. These models can be used to match S release to plant demand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025062
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  • 6
    Electronic Resource
    Electronic Resource
    Sulfur soil testing (1993)
    Springer
    Plant and soil 155-156 (1993), S. 383-386 
    Details
    ISSN: 1573-5036
    Keywords: Soil analysis ; soil testing ; sulfur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A wide range of extractants have been used to extract S from soils but correlations with plant response have generally been poor. Direct evidence that ester sulfates contribute to plant S supply lead to the development of the 0.25 M KCl extract heated at 40°C for 3 hours. Sequential extraction showed that this extractant removed 5.9% of ester sulfates from unfertilised soil. Support of the efficacy of the extract was obtained using specific radioactivity data from plants and soil extract.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025063
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