Relationship of Maize Yield to Climatic and Environmental Factors under Deficit Irrigation: A Quantitative Review

Table 3

Results of the best regression model of GY_V and IWUE_V for different growth stages.

Sources of variation	GYV		IWUEV
	Estimates	Standard error	Estimates	Standard error
Vegetative stage
Intercept	9.61	2.00^∗∗∗	−14.63	3.76^∗∗∗
Water deficit percentage			1.21	0.20^∗∗∗
Dry-subhumid	−8.82	3.61^∗	16.14	5.01^∗∗
Humid	59.5	4.01^∗∗∗
Semiarid	−2.83	2.4	7.39	3.07^∗
Adjusted R^2	0.89		0.68
Multiple R^2	0.90		0.71
P value	<0.001		<0.001
Reproductive stage
Water deficit percentage	0.42	0.11^∗∗∗	0.32	0.17
Dry-subhumid	6.08	6.52	23.98	10.45^∗
Humid	39.33	9.14^∗∗∗	−45.54	14.66^∗∗
Semiarid	5.56	5.2	−9.66	8.33
Adjusted R^2	0.39		0.46
Multiple R^2	0.44		0.50
P value	<0.001		<0.001
Vegetative and reproductive stage
Intercept	18.76	6.84^∗∗	91.9	64.83
Water deficit percentage	0.29	0.13^∗	0.56	0.42
Dry-subhumid	0.41	5.36	16.44	23.27
Humid	−17.28	6.75^∗	51.05	17.98^∗∗
Semiarid	−2.55	5.55	14.35	14.33
Nitrogen level			0.08	0.05
Cultivar cycle			−1.06	0.51^∗
Adjusted R^2	0.18		0.28
Multiple R^2	0.23		0.36
P value	0.004		<0.001

^∗∗∗p<0.001, ^∗∗p<0.01, and ^∗p<0.05.