Library

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
    Effect of mild drying on the mineralization of soil nitrogen (1985)
    Springer
    Plant and soil 84 (1985), S. 175-179 
    Details
    ISSN: 1573-5036
    Keywords: Biomas ; Drying ; Mineralization ; Nitrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Drying soil to −100 kPa increased the subsequent mineralization of nitrogen under optimal moisture conditions. The effect was greater when the soils were dried to −1500 Pa. Mineralization was greater after four cycles of wetting and drying than after one. Depending on the drying conditions, the amount of nitrogen mineralized after drying to −1500 Pa was between 6.8 and 18.2% of that mineralized after chloroform fumigation. After drying the soils the average ratio of ΔCO2-C respired to Δmin N was 21.1–22.3 depending on the drying conditions, whereas after chloroform treatment and autoclaving the ratio was 6.0 and 9.9 respectively. The effect of drying on nitrogen mineralization is attributed to two causes: the death and subsequent lysis of a small proportion of the soil organisms, and to the desorption of organic substances with a wide C/N ratio. Because of the stimulation of even mild drying conditions, marked differences in mineralization rates of soil nitrogen between cropping seasons must be expected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02143181
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Direct use of low grade phosphate rock from Brazil as fertilizer (1982)
    Springer
    Plant and soil 65 (1982), S. 351-362 
    Details
    ISSN: 1573-5036
    Keywords: Labile phosphate ; Phosphate rock ; Sorghum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A low-soluble phosphate rock from Patos (Brazil) was compared with monocalcium phosphate, and Gafsa and Morocco phosphate rocks as a source of phosphate for sorghum growing in three acid soils from Southern Bahia (Brazil). Before the test period with sorghum the four phosphates were allowed to react with the soils for 0,90, 180 and 270 days. The effectiveness of each source was assessed as the monocalcium phosphate (MCP) equivalent at zero reaction time. The MCP equivalent of the low-soluble phosphate rock was poor in all three soils; it increased with reaction time in an ultisol with comparatively high buffer capacities for calcium and phosphate, but did not change with reaction time in the other two soils. With increased reaction time in an oxisol there was a rapid decrease in availability of the monocalcium phosphate, and a less rapid decrease in availability of Gafsa and Morocco phosphate rocks. The results support the hypothesis that the rate of solubilization of phosphate rock is high in soils of low pH, and with high buffer capacities for calcium and phosphate. Soils with these properties should be selected for field experiments with low grade phosphate rock such as Patos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375056
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Direct use of low grade phosphate rock from Brazil as fertilizer (1982)
    Springer
    Plant and soil 65 (1982), S. 363-373 
    Details
    ISSN: 1573-5036
    Keywords: Cenchrus ; Desmodium ; Mycorrhiza ; N source ; Paspalum ; Phosphate rock ; Stylosanthes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The response of plant dry matter to addition of a low grade Brazillian (Patos) phosphate rock was increased by mycorrhizal inoculation (strain E3) ofStylosanthes guianensis andDesmodium intortum, but less so by inoculation ofCenchrus ciliaris andPaspalum plicatulum. The effect was related partly to the extent of root development. In the presence of a nitrification inhibitor the utilisation of Potos rock phosphate by Paspalum was higher with NH 4 + -N than with NO3-N. This effect was attributed to acidification which in turn was related to the organic anion content of the plants. The results indicate the potential for improving the utilization of the low grade phosphate rock on an acid oxisol by mycorrhizal inoculation of herbage legumes and by soil acidification when growing grasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375057
    Library Location Call Number Volume/Issue/Year 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...