Potting soil does not come cheap nowadays and if you have to fill a large raised bed, you will definitely notice the pinch. Using layers of different materials is cheaper and gives your plants more ...

Soil extracellular enzyme activities in the surface (0-5 cm) and subsurface (5-20 cm) layers of alpine meadow (A-F) and swamp meadow (G-L) under different warming treatments.CK: control treatment ...