It is sulfate: nitrate (Na2SO4) --- the surface is white, fluffy powdery fluffy saline soil, people step on it has a soft into the feeling, the masses said "water alkali" "white not salty" "Maura alkali". It has a cool feeling when tasted with the tip of tongue. NaCl mixed with Na2SO4 chloride - sulfate crusted fluffy salty soil, the masses called "Puffing alkali" people step on the sound of "Puffing - Puffing", tasted with the tip of the tongue with a salty, cool feeling.