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Více informací o knize Nitrogen Enigma in Tropical Soils

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Anotace knihy

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.

Parametry knihy

• Plný název: Nitrogen Enigma in Tropical Soils
• Podnázev: Unravelling the Phenomenon of NH4+ Fixation
• Autor: Gaius Eudoxie
• Jazyk: Angličtina
• Vazba: Brožovaná
• Počet stran: 256
• EAN: 9783639244991
• ID: 06832097
• Nakladatelství: VDM Verlag Dr. Müller
• Hmotnost: 398 g
• Rozměry: 220 × 150 × 15 mm
• Rok vydání: 2010

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