土壤结冰

permanent frost soil soil in situ Frost frost daughter of the soil son of the soil racy of the soil a son of the soil soil the man in the moon the man in the street the man in the oak lime in the soil moisture in the soil frost-heaving soil reactive aluminium in the vermont soil test accumulation of salt in the surface soil present in the upper 15cm of the soil increase in the water-holding capacity of soil reduce the effect of acid in a soil fertilizer the soil place into the soil enrich the soil