Use of a Digital Camera to Monitor the Growth and Nitrogen Status of Cotton

Table 2

Description of experiments for the calibration (experiment 1) and validation (experimentation) of the models.

Year	Location	Cultivar	Sowing date	Treatment	Irrigation	Sample collection
Calibration
2010	Shihezi University	XLZ 43; XLZ 48	20 April	5 N prates × 3 replications	5400 m^3 hm^−2	9 plants per treatment/every twelve days
2011			18 April
Validation
2012	105th Corps	XLZ 45	23 April	375 kg N hm^−2	5400 m^3 hm^−2	15 plants per site/every ten days
	149th Corps	BZ A1
	150th Corps	SZ 2