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Effects of defoliation on the cultivated strawberry (Fragaria X ananassa Duch.)
Using 'Redchief' (Junebearer) and 'Tribute' (dayneutral)
cultivars, greenhouse and field studies were conducted
to determine the effects of defoliation on photosynthesis,
growth and yield of the strawberry. From preliminary
photosynthesis experiments it was found that both
'Redchief' and 'Tribute' strawberry leaves reached maximum
net photosynthesis (Pn) concurrently with full leaf expansion
at approximately 8 to l0 days and 4 to 5 days, respectively,
after unfolding. By exposing the plants to
increasing irradiance it was determined that these cultivars
were light saturated at 600 to 700)Ï molâ ¢m-2s-1.
Neither cultivar showed a consistent diurnal pattern when
Pn was monitored hourly over two consecutive days.