Traits N P N×P W N×W P×W C
Total root length (TRL) ** NS NS * NS NS **
Root surface area (RSA) * * NS *** NS NS **
Root volume (RV) NS * NS *** NS NS **
Root tips (RT) ** ** NS NS NS NS ***
Root biomass (RB) NS NS NS ** NS NS **
SRL ** NS NS ** * ** **
RTD NS NS NS NS NS NS NS