Table 8.

Relationship between root system architectural traits and grain yield.

Root architecture parameters	Physiology maturity stage
	Equation	R2
Brace root angle	y = 0.0017×2 - 0.0577x + 2.8048	0.65**
Brace root number	y = 0.0287×2 - 1.0313x + 13.628	0.007ns
Brace root branch depth	y = 0.1003×2 - 1.6616x + 8.9689	0.65**
Crown root angle	y = 0.0048×2 - 0.4739x + 13.69	0.74**
Crown root number	y = −0.0018×2 + 0.36x - 2.0552	0.62**
Crown root branch depth	y = 0.0854×2 - 1.3006x + 6.9787	0.71**
Number of lateral root	y = −0.0515×2 + 1.3576x + 0.1385	0.56*