Read the summary and the most important questions on Soil-plant interactions

• 1 Overview S-P interactions

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• Soil physical variables

  Soil texture, structure and pore size 
  pF curve
  Conductance water, heat & gasses
  Mechanical resistance to root growth

• Chemical physical variables

  Types and concentrations of ions
  pH
  CEC (capacity to for binding H+ or HO-)
  Degree of buffering (Change of pH of one amount of acid)

• soil biological variables

  Composition of soil biota
  Activity of soil biota

• 2 Soil basic concepts

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• Soil forming factors

  Climate: Temerature, humidity. Higher -> reactions goes faster
  Organims: Trees break down rocks due searching to water. Biota are producing organic acid and organic matter. Plant will grow what will reduce erosion.
  Relief: Materials from a high slope will be transported by water to a lower slope.
  Parent material: Difference in parent material will give difference in minerals.
  Time: Time the material is exposed to atmospheric air.

• Soil forming processes

  Transformation: wheatering material or decomposing OM
  Additions: OM and dust
  Deletion: leaching or erosion-> losses
  Transporting: Moving material within the horizon

• What will change pH

  Decreasing:
  Respiration: CO2 + H2O-> H2CO3-> H + HCO3
  Decomposing OM: R-COOH -> R-COO + H
  Nitrification: NH4 + 2O2 -> 2H + H2O + NO3 
  
  Increasing: CaCO3 -> Ca + CO3 -> CO3 + H -> HCO3

• 3 Water

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• Dry bulk density

  Dried bulk/ Volume undried soil or Mass solid/Volume

• Particle density (ps)

  Mass solid/ Volume solid

• Matric potential or pressure potential

  Pressure of water at that spot

• Why is the water flowing to the shoot

  Because the water potential is lower in the atmospheric air