Table 2.

Broad-sense heritability for 19 root traits on different nitrogen and phosphorus conditions.

trait	control	low N	low P
average root width	0.65	0.22	0.93
bushiness	0.02	0.07	0.74
depth	0.14	0.50	0.55
ellipse axes aspect ratio	0.25	0.09	0.68
length distribution	0.15	0.35	0.62
major ellipse axes	0.39	0.52	0.90
maximum number of roots	0.73	0.23	0.90
max. width	0.48	0.03	0.65
median number of roots	0.71	0.26	0.67
minor ellipse axes	0.05	0.07	0.13
network area	0.61	0.54	0.78
network convex area	0.09	0.32	0.12
perimeter	0.66	0.46	0.85
solidity	0.50	0.00	0.75
specific root length	0.66	0.22	0.91
surface area	0.59	0.56	0.76
total length	0.64	0.51	0.84
volume	0.51	0.59	0.64
width depth ratio	0.35	0.06	0.72