Across
- 2. a type of animal that pen manure is collected from
- 4. the acronym for P in NPK
- 9. organic manure
- 10. fresh manure will do this to a plant
- 11. urine collected from farm animals
- 12. the downward movement of nutrients in the soil
Down
- 1. organic manure collected from wild birds
- 3. a cycle that deals with the decomposition of plants and animals
- 5. a cycle that regulate oxygen in the atmosphere
- 6. the acronym for K in NPK
- 7. another name for pen manure
- 8. inorganic fertilizer
- 11. provide nitrogen for the soil