1. Soil acidity
Yoda Conyers

2. pH and Acidity Acid alkaline pH: 0  7  14 Sour ‘sweet’
Taste Vinegar milk
Lemon, lime
Plants Sorrel lucerne
Oxalis barley

3. How acidity develops: naturally, by carbonic acid
N cycling, by nitrification
C cycling, by product removal

7. N cycle acidification:
Organic matter, or Urine
R- NH2  NH4OH  NH OH-
NH4+  NO3- 2H+
Net: organic N  NO3- H+

8.  NO3- H+
 OH-
Net process: neutral

9. H+ adsorbed onto clay.........NO3- leaches 

10. Clay + H+  Al3+, SiO2, cations
Acid soil  clay breakdown =
Al released, nutrient cations lost
i.e Al toxicity and an infertile soil

11. How does lime work?
CaCO3 + 2H+ 
Ca2+ + (H2CO3  H2O + CO2 )

12. Chemical  biological  ecological
lime imported hay/compost
hay fed back perennial grasses
manure spread
split N applications maximise legume N

13. Simple this is
No questions have you?