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Plant and Soil (2006) 283:323-337

C.F. Scagel
USDA-ARS
Horticultural Crops Research Laboratory
3420 NW Orchard Avenue
Corvallis, OR 97330

R.P. Schreiner
USDA-ARS
Horticultural Crops Research Laboratory
3420 NW Orchard Avenue
Corvallis, OR 97330