Twyford

5, 6, 6G - Twyford - Dominant Soil @ Map Scale 1:50000

Associated Soil/s	14 may also be found within these areas (5, 6, 6g) if a more detailed survey was carried out.
Soil Properties of Dominant Soil/s
Parent material	Hastings age alluvium from greywacke
Characteristics of site	Older levees more than 700 years old, beyond present river flood level
Soil features	Silt loams (5) on lower parts, and sandy loams over sands (6) on higher parts of levees
Natural drainage Depth to gley and hence to water table after wet periods	Good 5, 6 - >90 cm
Potential rooting depth, texture, and limiting layer	5 - >45 cm silt loam on sandy loam on stones or buried topsoil 6 - >45 cm sandy loam on sand on stones or buried topsoil 6g – 30–45 cm sandy loam on stones
Available water capacity (AWC)	5 – >75 mm 6 – >50–75 mm 6g – 25-50 mm
Infiltration rate	5, 6 – moderate 5 – if compacted slow 6g – rapid if sandy
Permeability rate	5, 6 – moderate but slow if on buried topsoil
Susceptibility to pugging and compaction when wet	5 – high 6 – moderate
Susceptibility to wind erosion when dry	6, 6g – high if sandy topsoil
Unfavourable soil characteristics	5 – topsoil easily compacted, causing slow infiltration 5, 6 – slow permeability if on buried topsoil

 

Soil Management of Dominant Soil/s

Artificial drainage - drain spacing	None required
Cultivate when moist to avoid: Compaction Wind erosion	5 6, 6g
Irrigation:- Recommended method Dripper spacing for continuous wetted strip Amount and frequency	6, 6g - sprinklers to prevent water loss If 4 l/hr drippers used 6, 6g - 40cm 5 - 60cm 6g - 15-25mm often to prevent water loss

 

Twyford (5,6,6g) (photo E. Griffiths)