5.3 understand the use of fertiliser to increase crop yield

5.3 •fertilisers ensure crops have nutrients 

                •plants need the Nitrates, Phosphates, Potassium so they can create proteins

                •their growth would be stunted 

                          •these elements may be missing if the soil had crops before 

                          •farmers use fertilisers to replace missing elements or provide more of them, increasing crop yield  

                                    •gradual leakage prevents leeching and eutrophication