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Книга Nitrogen Enigma in Tropical Soils Gaius Eudoxie

Nitrogen Enigma in Tropical Soils

Unravelling the Phenomenon of NH4+ Fixation

Автор: Gaius Eudoxie
Език: Английски език
Корици: С меки корици
Издател: VDM Verlag Dr. Müller
Наличност: Налично при издателя, по поръчка
Изпращаме след 17-27 дни
81.52 € 159.44 лв
Fixed NH4+ has been shown to occupy a significant portion of the total N of some tropical soils, whi...

Информация за книгата

Автор
Gaius Eudoxie
Език
Английски език
Корици
Книга - С меки корици
Издадена
2010
страници
256
EAN
9783639244991
Enbook ID
06832097
Издател
VDM Verlag Dr. Müller
Теглоt
398
Размери
150 x 220 x 15

Пълно описание

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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