Across
- 5. The process by which air in the soil is replenished by air from the atmosphere.
- 8. Refers to the extent of voids or openings in the soil that exist between soil particles and soil peds or clods. These pores hold water and air for absorption by plant roots.
- 10. A measure of the amount of matter in an object.
- 11. A porous or spongy form of volcanic glass.
- 12. Soil or soil–like material in which plants are grown.
- 14. A mineral, or minerals, classified with the micas, which with treatment at high temperatures, expands into scales, and becomes a loose, absorbent mass.
- 15. A volcanic glass having numerous concentric cracks that give rise to perlitic structure. Used in synthetic potting media mix.
- 16. Mass per unit volume.
- 17. The tissues outside the vascular tissue overlying a woody stem.
Down
- 1. Fibrous, partly decayed fragments of vascular plants that retain enough structure so that the peat can be identified as originating from certain plants (e.g., sphagnum peat or sedge peat).
- 2. Any organic or inorganic material added to soil or water to provide plant nutrients and to increase the growth, yield, quantity, or nutritive value to the plants grown therein.
- 3. The mineral and organic surface of the earth capable of supporting upland plants.
- 4. A mineral calcium sulfate, combined with water of hydration.
- 6. Calcium oxide, CaO, but, as commonly used in agricultural terminology, calcium carbonate, CaCO3, and calcium hydroxide, Ca(OH)2, are included. Agricultural lime refers to any of these compounds with or without magnesium carbonate, which are used as amendments chiefly for acid soils.
- 7. The quantity of three–dimensional space enclosed by some closed boundary.
- 9. measurement A system for the measurement of volume or space in cubic units.
- 13. The removal of surplus ground or surface water by artificial means.