Detalle de Cambio

Cambio #4 Cu null dose (Soil-2019)
Descripción Originalmente, the doses of Cu added to the soils were 0, 500 and 1000 mg/kg.
En esta replicación, soils are not artificially contaminated with Cu.
Con el propósito de experiment with the Cu already in the soil.
Dimensión Operacionalización, específicamente, tratamiento.
Efectos sobre la validez
  • Este cambio incrementa moderadamente (+2) la validez interna porque cu levels are those present in the soil, are non-toxic to the plant and better reflects the construct
Comentarios These soils are urban gardens with natural contamination (Cu levels 36 and 206 mg/kg).
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