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Some Effects of Photoperiod on the Performance of Korean Lespedeza¹

The effect of photoperiod on the performance of Korean lespedeza (Lespedeza stipulacea Maxim.) was investigated under field conditions for 5 years at Fayetteville (north) and for 3 years at Hope (south), Ark. varieties and strains differing widely in maturity were planted at each location on four different dates each year beginning in March and continuing at monthly intervals through June. Floral initiation took place in the earliest maturing variety at Fayetteville and in all four varieties at Hope while the natural photoperiods still were increasing in length. Rate of vegetative growth was reduced when seedlings emerged in the spring before day-lengths were equal to or greater than their critical photoperiod. With one exception, the three earliest maturing varieties produced highest hay yields from the April date of planting at both locations. Conversely, hay yields from the latest maturing variety were highest from the March date of planting at each of the two locations. Seed maturity for all varieties was delayed only one to two days for each month planting was delayed at both locations, but each variety matured earlier at Hope than at Fayetteville for any given date of planting. Seed yields of the three earliest maturing varieties were highest from the June date of planting at Fayetteville and from the May date of planting at Hope, whereas the exact opposite was true for the latest maturing variety.

Key Words: photoperiodism • photoperiodic aftereffect • day-length

² Professor of Agronomy, University of Arkansas.

Received for publication November 3, 1967.