Effects of daylength upon growth and development of spinach (Spinacea oleracea L.) Authors van Oorschot, J.L.P. Publication Date Jan 01, 1960 Source Wageningen University and Researchcenter Publications Keywords Growth Photoperiod Spinach Spinacia Oleracea Fotoperiode Groei Spinacia Oleracea Spinazie Language English License Unknown External links Full record on research.wur.nl