Soil acidity Yoda Conyers.

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Presentation transcript:

Soil acidity Yoda Conyers

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

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

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

 NO3- H+  OH- Net process: neutral

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

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

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

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

Simple this is No questions have you?