ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    An evaluation of the immiscible displacement method for studying the reaction between soil and phosphate (1982)
    Springer
    Nutrient cycling in agroecosystems 3 (1982), S. 423-433 
    Details
    ISSN: 1573-0867
    Keywords: methods ; phophate fertilization ; reaction rate ; soil ; variable charge
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The reaction between soil and phosphate was studied using a method in which a sample of the soil solution was displaced by centrifuging moist soil with a dense, immiscible organic liquid. The soil solution floats on the organic liquid and can be removed for analysis. Phosphate concentrations in the soil solution so displaced were lower than those estimated by the null-point method using 0.01M calcium chloride. The differences were shown to be closely associated with the lower calcium concentration of the soil solution. Adsorption from solutions of monovalent phosphate salts was accompanied by accumulation of cations in the soil solution. It was argued that this occurred because the average charge conveyed to the adsorbing surfaces was less than unity. Calculated values were between 0.90 and 0.96. The remainder of the charge was balanced by release of hydroxide ions and small increases in pH were observed. The immiscible displacement method appeared to be potentially valuable for many studies of the reaction between chemicals and soil. Its main disadvantage is that the volume of solution available for analysis is small and this places limits on the sensitivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048945
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A discussion of the methods for measuring the rate of reaction between soil and phosphate (1983)
    Springer
    Nutrient cycling in agroecosystems 4 (1983), S. 51-61 
    Details
    ISSN: 1573-0867
    Keywords: methods ; phosphate adsorption ; phosphate fertilization ; reaction rate ; soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two approaches have been used in measuring the rate of reaction between soil and phosphate. In one, a large volume of solution has been mixed with a small weight of soil; in the other, the volume of phosphate solution has been limited to that needed to moisten the soil to its field moisture content. Using a small volume of solution requires special techniques to measure the concentration in solution but has the advantage that the amount of phosphate in solution is small. As a result the amount adsorbed does not increase much after the first few minutes. Mathematical functions can then be used directly to relate the change in concentration to time. Using a large volume makes measurement of concentration easy but poses mathematical problems because both the concentration in solution and the amount adsorbed change simultaneously. It is not acceptable to relate concetration (or adsorption) to time without taking this into account. Published evidence indicates that differences between soils in the rate of reaction reflect differences in the kind of adsorbing surfaces present rather than merely differences in the amount of adsorbing surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01049666
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Estimating thermal properties of simulated aquatic soils from their composition (1981)
    Springer
    Hydrobiologia 80 (1981), S. 225-230 
    Details
    ISSN: 1573-5117
    Keywords: aquatic ; temperature ; soil ; composition ; gas ; water ; annual change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Heat penetration and thermal lag in the submersed soil surrounding the roots of aquatic plants depends on two fundamental thermal properties of the substrate, volumetric heat capacity (CV) and thermal conductivity (k). The relationship of these parameters to the fractions of organic and mineral matter, gas and water in natural and simulated aquatic soils was investigated. The gas fraction was found to be insignificant and it was possible to make good estimates of CV and k from a knowledge of substrate water content alone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018361
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Nitrous oxide emissions from fertilized and unfertilized soils in a subtropical region (Andalusia, Spain) (1984)
    Springer
    Journal of atmospheric chemistry 1 (1984), S. 159-169 
    Details
    ISSN: 1573-0662
    Keywords: N2O emission ; nitrogen fertilizer ; soil ; subtropics ; atmospheric budget
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Field measurements of N2O emission rates were carried out from August until October 1982 in a subtropical region in Europe, i.e. in Andalusia, Spain. The measurements were performed by using an automatic sampling and analysis technique allowing the semi-continuous determination of N2O emission rates. The N2O emission rates were positively correlated to the soil surface temperature and exhibited a diurnal rhythm with maximum rates in the afternoon and minimum rates in the early morning with average values of 1 μg N2O−N/m2/h for the grass lawn and 15 μg N2O−N/m2/h for cultivated land. Application of urea and ammonium nitrate resulted in elevated N2O emission rates when compared to the unfertilized control. The loss of fertilizer-nitrogen as N2O was 0.18% for urea and 0.04% for NH4NO3 which compares very well with data obtained in a temperate climate (Germany). The total source strength of fertilizer-derived N2O is estimated to be 0.01–2.2 Tg N2O−N per year. The N2O flux from unfertilized natural soils may be as high as 4.5 Tg N2O−N, indicating that the N2O emission from soils contributes significantly to the global N2O budget.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053838
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Field measurements of NO and NO2 emissions from fertilized and unfertilized soils (1984)
    Springer
    Journal of atmospheric chemistry 2 (1984), S. 1-24 
    Details
    ISSN: 1573-0662
    Keywords: NO ; NO2 ; soil ; decomposition ; production ; global budget ; mineral fertilizer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract Field measurements of NO and NO2 emissions from soils have been performed in Finthen near Mainz (F.R.G.) and in Utrera near Seville (Spain). The applied method employed a flow box coupled with a chemiluminescent NO x detector allowing the determination of minimum flux rates of 2 μg N m-2 h-1 for NO and 3 μg m-2 h-1 for NO2. The NO and NO2 flux rates were found to be strongly dependent on soil surface temperatures and showed strong daily variations with maximum values during the early afternoon and minimum values during the early morning. Between the daily variation patterns of NO and NO2, there was a time lag of about 2 h which seem to be due to the different physico-chemical properties of NO and NO2. The apparent activation energy of NO emission calculated from the Arrhenius equation ranged between 44 and 103 kJ per mole. The NO and NO2 emission rates were positively correlated with soil moisture in the upper soil layer. The measurements carried out in August in Finthen clearly indicate the establishment of NO and NO2 equilibrium mixing ratios which appeared to be on the order of 20 ppbv for NO and 10 ppbv for NO2. The soil acted as a net sink for ambient air NO and NO2 mixing ratios higher than the equilibrium values and a net source for NO and NO2 mixing ratios lower than the equilibrium values. This behaviour as well as the observation of equilibrium mixing ratios clearly indicate that NO and NO2 are formed and destroyed concurrently in the soil. Average flux rates measured on bare unfertilized soils were about 10 μg N m-2 h-1 for NO2 and 8 μg N m-2 h-1 for NO. The NO and NO2 flux rates were significantly reduced on plant covered soil plots. In some cases, the flux rates of both gases became negative indicating that the vegetation may act as a sink for atmospheric NO and NO2. Application of mineral fertilizers increased the NO and NO2 emission rates. Highest emission rates were observed for urea followed by NH4Cl, NH4NO3 and NaNO3. The fertilizer loss rates ranged from 0.1% for NaNO3 to 5.4% for urea. Vegetation cover substantially reduced the fertilizer loss rate. The total NO x emission from soil is estimated to be 11 Tg N yr-1. This figure is an upper limit and includes the emission of 7 Tg N yr-1 from natural unfertilized soils, 2 Tg N yr-1 from fertilized soils as well as 2 Tg N yr-1 from animal excreta. Despite its speculative character, this estimation indicates that NO x emission by soil is important for tropospheric chemistry especially in remote areas where the NO x production by other sources is comparatively small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00127260
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Investigation of keratinophilic fungi from soils in Western Australia a preliminary survey (1980)
    Springer
    Mycopathologia 72 (1980), S. 155-165 
    Details
    ISSN: 1573-0832
    Keywords: Keratinophilic fungi ; dermatophytes ; soil ; Western Australia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In order to determine which species of geophilic dermatophytes were present in Western Australian soils 299 samples were investigated. These samples were collected from a range of locations, 208 from towns throughout the state and 91 samples from the Perth Metropolitan area. Most samples were collected from areas frequented by people and animals, such as home gardens, parks and animal yards. Of the total 299 soils, 271 (90.6 %) yielded keratinophilic fungi. A total of 181 dermatophytes were isolated, and there were 205 isolations of other keratinophilic fungi. Microsporum gypseum (30.7 %) was the most prevalent dermatophyte recovered from soil followed byMicrosporum cookei (21.7 %) and thenTrichophyton ajelloi (8.0 %). No other dermatophytes were recovered.Chrysosporium indicum was the most common of all the keratinophilic fungi and was isolated from 50.1 % of the samples. Mixed growth was obtained from 33.5 % of the soil samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572658
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...