Table 6. Measurement uncertainties (d) relative to measurement ranges (R) of NDVI and LWP (expressed as percentage) observed in different crops/days at Uvalde in 2018.

Crop	Date	Irrigation†	n	${\displaystyle \frac{{\delta }_{NDVI}}{R_{NDVI}}(\mathrm{\%})}$	${\displaystyle \frac{{\delta }_{LWP}}{R_{LWP}}(\mathrm{\%})}$
Wheat	Apr. 12	F	8	–	6.0
Corn	Jun. 7	D	9	10.5	3.8
	Jun. 7	F	9	10.5	3.8
	Jun. 11	D	9	19.8	3.7
Cotton	Aug. 9	D	9	6.6	5.3
	Aug. 9	F	9	6.4	5.9

Notes:

^†“D” and “F” represent “deficit” and “full” irrigation.