NEED

• WHY ARE FERTILISERS NEEDED?

  • in farming, dead remains/ urine/ faeces are rarely returned to the soil
  • concentration of mineral ions in soil falls
  • decreasing productivity
• TWO TYPES OF FERTILISERS?

  NATURAL/ ORGANIC: dead decaying remains of animals/ plants and animal wastes

  ARTIFICIAL/ INORGANIC: mined from rocks and deposits before being converted into different forms and blended
• HOW TO HAVE THE GREATEST PRODUCTIVITY INCREASE?

  combination of both types of fertiliser
• HOW DO FERTILISERS INCREASE PRODUCTIVITY?

  • nitrogen found in AAs, ATP, DNA nucleotides
  • needed for growth
  • more nitrates in soil
  • lead to earlier development, taller plants, greater leaf area
  • increase photosynthesis