Across
- 4. Plant and animal manure is broken down by these in the soil
- 5. The area around the root where the soil is influenced by the plant root
- 6. An important macroorganism in the soil
- 9. When usable nitrates are converted to atmospheric nitrogen
- 13. The type of relationship where two organisms live in close association and both benefit
- 14. Carbon dioxide in the atmosphere is taken in by the plants through this process
Down
- 1. The form of nitrogen that can be used by the plant
- 2. Where bacteria live in the clover plant
- 3. This process releases carbon dioxide into the soil during the carbon cycle
- 7. The conversion of organic matter to humus
- 8. A plant added to swards because of its ability to fix nitrogen
- 10. A community of microorganisms that inhabit a particular environment
- 11. Soil _______ is the total mass of living organisms in a soil
- 12. Bacteria that has a symbiotic relationship with clover