Table 11.

Regression coefficients and their standardized values of space components for crop yield changes during 2003–2017 national summer maize trials.

Regression	Item	Canopy volume gap	Yield per unit volume gap	R2
Coefficient	Min	2803	1709	0.73
Coefficient	Max	3551	1804	0.78
Coefficient	Mean	3283	1752	0.75
Standard coeff.	Mean	0.87	1.31