Ball milling pretreatment affects the content of fixed ammonium …
ABSTRACT 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 …
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