Field experiments concerning the effect of magnesium fertilizers on the growth and yield of soybean,peanut,rice and milk vetch (Astragalus Sinicus) were carried out on some upland and paddy soils derived from red clay and red sandstone in Kiangsi Province.Results revealed that an application of MgS0₄ (at a rate of 15 Kg Mg/hectare) to upland soils could increase the yield of soybean and peanut to about 20%.In paddy soils,a better response to magnesium fertilizer was found in milk vetch than in the succeeding rice plants.