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  • sulfur  (3)
  • Rhodes grass  (2)
  • Springer  (5)
  • 1
    Electronic Resource
    Electronic Resource
    The growth and nitrogen uptake of Rhodes grass grown on soils with varying histories of legume cropping (1980)
    Springer
    Plant and soil 57 (1980), S. 249-255 
    Details
    ISSN: 1573-5036
    Keywords: Legumes ; Nitrogen ; Rhodes grass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Rhodes grass (Chloris gayana) was grown under glasshouse conditions on soils that had previously grown from 1 to 6 soybean (Glycine max) or Siratro (Macroptillium atropurpureum) crops. Soil mineral N contents at sowing were higher in Siratro-cropped than soybean-cropped soils and increased with cropping history. Yields of Rhodes grass at the first harvest (14 weeks) were related to soil mineral N levels at sowing by the relationship Y=138.7 (1−0.917e−0.012x). Grass grown on all soybean soils was responsive to N at both harvests (14 and 28 weeks). Grass grown on soil that had grown three or more Siratro crops was non-responsive to N at the first harvest but responses to N were recorded on all Siratro soils at the second harvest. The amount of N removed by the grass crops was small in relation to the total amount present in the soil system. This resulted in no change in soil total N levels over the two crop periods. These results highlight the need to study N dynamics in crop systems rather than continue to measure N pool sizes when evaluating the contribution of biologically fixed N to the nutrition of subsequent non-legume crops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211685
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  • 2
    Electronic Resource
    Electronic Resource
    Mineralization of15N-labelled legume residues in soils with different nitrogen contents and its uptake by Rhodes grass (1980)
    Springer
    Plant and soil 57 (1980), S. 237-248 
    Details
    ISSN: 1573-5036
    Keywords: Mineralization ; Nitrogen ; Residues ; Rhodes grass ; Soil N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Soil was collected from pots that had grown 1,3 or 6 soybean (Glycine max) or Siratro (Macroptillium atropurpureum) crops that had received organic residue returns from each crop.15N-labelled residues were added to half the pots in the experiment and the other half left unamended. Half of each group was then sown to Rhodes grass (Chloris gayana) which was grown, under glasshouse conditions, for 12 weeks. Ten grams of organic matter residues were added to each pot (1.5 kg soil) and the pots subjected to two wetting and drying cycles. At the end of the second wet cycle, soil mineral N values ranged from 6 to 64 ppm in unamended soils and from 19 to 177 ppm in amended soils. These levels generally declined over a 12 week period both in the presence and absence of sown grass. Nitrogen uptake by the grass increased with the number of previous cycles and was higher in Siratro than soybean soils. Recovery of15N by plant growth from the incorporated soybean residues was little effected by previous crop history and averaged 15.4%. On the other hand, Siratro recoveries were 13.7, 42.4 and 55.5% from soils that had grown 1, 3 and 6 previous Siratro crops, respectively. The addition of organic residues stimulated the release of native organic N (positive priming effect) on all soils. These results show that the turnover rate of nitrogen from organic residues can be high and the net result of these additions depends on the nature of the organic residues and the soil system to which they are added. These data emphasise the need to consider the rate of nutrient turnover from organic sources rather than concentrate on the nature and size of the resident nutrient pools.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211684
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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
    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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  • 5
    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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