Magnesium availability from kieserite and calcined magnesite on five soils of different pH

摘要: Five soils from the South of England were incubated with additions magnesium fertilizers ; two also received magnesian limestone. After years, recovery added by 0.5 h extraction 1 M ammonium nitrate was 75-89% for kieserite granules, 64-84% calcined magnesite powder (<1 mm), but only 20-41% granules (1-3 mm) and 26-32% ground These all much greater than Mg dissolved extracting directly in I nitrate. In calcareous soils, less most this reduction due to its particle size rather soil pH. The four sources are evaluated as agriculture. Kieserite is reliable means raising low status.