Selecting Soybean Varieties for Maturity

Selecting Soybean Varieties for Maturity

Bill Wiebold Plant Sciences University of Missouri

Earth is tilted on its axis

23.5?

As the earth revolves around the sun, length of photoperiod changes each day. Length of photoperiod is related to latitude.

Length of Photoperiods as Affected by Date

16

15

14

13

12

Vernal Equinox

11

10

Winter Solstice

9

8

0

73

New Orleans

Summer Solstice

Autumnal Equinox

Winter Solstice

146

219

Columbia

292

365

Minneapolis

Length of Photoperiods as Affected by Latitude

16 15 14 13 12 11 10

9 8

0

73

146

219

New Orleans Columbia

292

365

Minneapolis

Photoperiod Length in Missouri

16

23 minutes

15 14 13 12 11 10

9 8

Sikeston Maryville

Number of hours

1 9 17 25 33 41 49 57 65 73 81 89 97 105 113 121 129 137 145 153 161 169 177 185 193 201 209 217 225 233 241 249 257 265 273 281 289 297 305 313 321 329 337 345 353 361

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