General Nutrient Principles

General Nutrient Principles

1. soil supply + fert

   • plant nutrient requirement

2. crop requirement - soil supply

   • fert required

3. potential yield x nutrient content

   • crop requirement

4. 80% of OSR received sulphur last year

   • E-on state that desulphurisation towers reduce SO2 emissions by 92%
     • hence reduce natural soil levels

5. RB209 not enforced but states best practice

6. assess crop requirements

7. assess nutrient supply from soil

   • every 4 years
   • SNS annually
   • allow for nutrients from FYM

8. only apply what is needed

9. ensure nutrient losses are minimised

   • lost profit
   • more pollution

10. difference between maximum and optimum

11. FACTS

    • learn RB209
    • FQA - professionally liable

12. sustainable use directive

13. Fert use survey every march

    • British Survey of Fertiliser practice 2011
    • Approx 100kg/ha of N
      • N use in grass has decreased
        • economic
        • more efficient
        • area reduction
        • increase in manure use
    • P and K decrease
      • on grassland and arable