Table 2 North latitude, east longitude, altitude, mean daily temperature, diurnal temperature variation, solar radiation, and precipitation during the maize growing season at Qitai and Yinchuan in 2016 and 2017.

From: Improving maize grain yield by matching maize growth and solar radiation

Years

Site

North latitude

East longitude

Altitude (m)

Mean daily temperature (°C)

Diurnal temperature variation (°C)

precipitation (mm)

Accumulated solar radiation (MJ m−2)

2016

Qitai

43°50′

89°46′

1020

20.08

14.12

176.3

1571

2017

20.35

15.54

107.8

1592

2016

Yinchuan

38°13′

106°14′

1120

21.53

12.12

198.6

1476

2017

21.78

12.91

142.5

1503