Experiments were conducted with the field investigation,pot and field experiments to study the magnesium supply status of main soil types and effects of Mg fertilizer on yield and quality of crops in Shanxi province.The results showed that the average content of exchangeable Mg in top soils(0-20 cm) of main types of soils in Shanxi province was 255.1 mg/kg,varied from 78.1 to 641.8 mg/kg.The order of exchangeable Mg content in different type soils was fluvo-aquic soil >cinnamon soil >chestnut-cinnamon soil ...