13.4 use of natural & artificial fertilisers Flashcards
1
Q
why are fertilisers needed?
A
intensive food production puts great demand on soil -> mineral ions are removed & not replaced
2
Q
what are organic fertilisers?
A
dead, decaying remains
- manure, slurry, bone meal
3
Q
what are inorganic fertilisers?
A
mined from rocks & deposits, then converted and blended
- contains nitrogen, phosphorus, potassium
