Fig. 1From: Early root development of field-grown poplar: effects of planting material and genotypeArrangement of sampling depths and widths around poplar trees established from cuttings (C), stakes (S), and poles (P). Horizontal bars on central axis represent depth of planting of cuttings (C, 0.3Â m), stakes (S, 0.5Â m) and poles (P, 0.8Â m). Planting materials have different diameters (not shown). Excavations exceeded 1.0-m radius and depth when roots extended beyond shown dimensionsBack to article page