Ball milling pretreatment affects the content of fixed ammonium in soils in response to the content of exchangeable ammonium
| Autor: | Naoki Moritsuka, Kaori Matsuoka, Shinya Funakawa |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Ammonium sulfate Inorganic chemistry Soil Science 04 agricultural and veterinary sciences Plant Science Common method 01 natural sciences law.invention chemistry.chemical_compound Sieve chemistry law Soil water 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Paddy soils Ammonium Ball mill 010606 plant biology & botany Nuclear chemistry |
| Zdroj: | Soil Science and Plant Nutrition. 63:321-328 |
| ISSN: | 1747-0765 0038-0768 |
| Popis: | Analysis of fixed ammonium (NH4+) in soils by the most common method requires the subsample to be ground to pass through a 100-mesh sieve. We tested a hypothesis that the ball milling pretreatment for the analysis of fixed NH4+ may influence the analytical results depending on the content of exchangeable NH4+. Five paddy soils collected from the surface layer in Japan were treated with 15N-labeled ammonium sulfate at 0, 100, 500, or 1000 mg N kg−1, incubated aerobically at 30°C for 7 days, and air-dried. Part of each soil was then ground in a vibration ball mill at 1200 rpm for 10 min as a pretreatment (BMP treatment). The samples with and without the BMP treatment were analyzed for exchangeable NH4+ and total fixed NH4+. The samples that received 0 or 1000 mg N kg−1 were also analyzed for nonexchangeable 15N (total fixed 15NH4+ plus organic 15N) and hot KCl-extractable organic N. At 0 mg N kg−1, the BMP treatment significantly decreased total fixed NH4+ in all soils and significantly increased ex... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|