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Książka Nitrogen Enigma in Tropical Soils Gaius Eudoxie

Nitrogen Enigma in Tropical Soils

Unravelling the Phenomenon of NH4+ Fixation

Autor: Gaius Eudoxie
Język: Angielski
Oprawa: Miękka
Wydawca: VDM Verlag Dr. Müller
Dostępność: Na zamówienie
Wysyłamy za 17-27 dni
336.53 zł
Fixed NH4+ has been shown to occupy a significant portion of the total N of some tropical soils, whi...

Informacje o książce

Autor
Gaius Eudoxie
Język
Angielski
Oprawa
Książka - Miękka
Data wydania
2010
strony
256
EAN
9783639244991
Enbook ID
06832097
Wydawca
VDM Verlag Dr. Müller
Waga
398
Wymiary
150 x 220 x 15

Pełny opis

Fixed NH4+ has been shown to occupy a significant portion of the total N of some tropical soils, which may alter and influence the N availability and dynamics in these soils. A series of laboratory investigations and a green house study were conducted to determine the extent and dynamics of fixation of fertiliser N in a range of agricultural soils using 15N techniques. Existing micro-diffusion procedures as a necessary step in the pre-concentration of exchangeable NH4+ and NO3--15N were validated, and new procedures for measuring fixed NH4+-15N fractions (total, strongly and weakly fixed) were developed. Laboratory incubations showed fixation to increase linearly with increasing N application rate. In green house studies cropping resulted in a slow release of a small portion (13.3 %) of the "recently" fixed NH4+ at 42 days after cropping. Potassium (K+) added after N fertilization resulted in the release of "recently" fixed NH4+ being blocked. These findings should provide agronomist and soil fertility researchers with pertinent information regarding alterations to N management tools and systems.

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