DOLERITE I T M S R E D S A N D involve the excavation of roots. While they are I l D unrivalled as a means of disclosing the spatial distriI . . ? bution of roots, they present only a static picture of 4 $2 a root system at one instant of time, so in order to study both the distribution of roots at different stages of crop growth and to compensate for soil heterogeneity, which may markedly affe...
