Factor

5 days after heading

10 days after heading

15 days after heading

20 days after heading

Maximum temperature

0.246

0.140

0.166

0.339

Minimum temperature

0.386*

0.478**

0.392*

0.383*

Average temperature

0.323

0.321

0.272

0.391*

Daily temperature difference

0.137

−0.075

0.132

0.034

Rainfall capacity

0.017

0.110

0.190

−0.081

Air humidity

−0.080

0.051

−0.006

−0.214

solar radiation

0.378*

0.015

−0.093

0.222