why are fertilisers needed in agricultural ecosystems?
crops grown repeatedly on same land. they take up mineral ions. these are not returned to the soil and the low levels can limit photosynthesis. fertilisers replace them increasing photosynthesis and productivity.
1 of 8
nitrogen is an esential component of ...
protein and DNA
2 of 8
natural fertilisers...
consists of dead/decaying animal and plant remains as well as animal wastes like manure and bone meal.
3 of 8
arificial fertiliser...
mined from rocks and deposits then converted into different forms and blended together to give the appropriate balance of minerals in a paticular crop.
4 of 8
what are the detrimental effects of the use of nitrogen fertilisers?
reduced species diversity, leaching and eutrophication.
5 of 8
why reduced species diversity?
high soil-nitrate concentrations favour the growth of fast growing species (nettles,grasses etc). these out compete other species. hy medows can only grow when soil nitrates are sufficiently low.
6 of 8
leaching?
may lead to pollution of watercourses
7 of 8
eutrophication?
caused by leaching of fertiliser into water course
8 of 8
Other cards in this set
Card 2
Front
nitrogen is an esential component of ...
Back
protein and DNA
Card 3
Front
natural fertilisers...
Back
Card 4
Front
arificial fertiliser...
Back
Card 5
Front
what are the detrimental effects of the use of nitrogen fertilisers?
Comments
No comments have yet been made