Table 5.

Selected coefficients of correlation between crop traits measured in the field and remote detected canopy cover and NDVI _Plant shown for different times of measurement

Ground plant parameter		Canopy cover
	DAS a	56	75	81	96	103	113	117	147
Plant density	29	0.67***	0.78***	0.73***
Plant vigour rating	47	0.77***	0.58***	0.48***
Leaf length	49	0.67***	0.51***	0.34**
Radiation interception	75	0.77***	0.74***	0.76***
Radiation interception	97			0.82***	0.75***	0.86***
Total plant biomass	81-97			0.34*	0.22 ns	0.3*
LAIb	81-97			0.32*	0.3*	0.38**
Radiation interception	112					0.6***	0.63***	0.71***
Stay green rating	117					−0.22 ns	−0.2 ns	−0.16 ns
Stay green rating	147						−0.33**	−0.12 ns	0.34**
Radiation interception	147						0.2 ns	0.49***	0.41**
		NDVI Plant
Plant density	29	0.37***	0.52***	0.39***
Plant vigour rating	47	0.64***	0.55***	0.34***
Radiation interception	75	0.47***	0.62***	0.40***
SPAD	96			−0.45***	−0.59***	−0.55***
Radiation interception	97			0.49***	0.29*	0.50***
Leaf biomass	81-97			0.39***	0.43***	0.35***
Plant height	81-97			0.41***	0.18 ns	0.37**
LAI	81-97			0.58***	0.44***	0.58***
SPAD	103					−0.54***	−0.50***	−0.50***
Radiation interception	112					0.43***	0.27***	0.38***
Stay green rating	147						0.38**	0.36***	0.53***

^aDays after sowing, see Table 2 for conversion in thermal time, ^bLeaf area index (m² m⁻²).

Significance codes are: ‘***’ p-value < 0.001, ‘**’ p-value < 0.01 and ‘*’p-value < 0.05.