Tropical and subtropical vegetables (2+1)

Photoperiod

VI. Photoperiod:

Short day vegetables: Soybean, Sweet potato

Long day vegetables: Flowering is induced by period longer than critical units.
                   eg; Spinach, beet, Chinese cabbage, Lettuce, Radish etc.

Day neutral vegetables: Flowerings induced by a period of 10-18 hours of even continuous illumination.
                  eg: Tomato, Squash, Pumpkin, Asparagus, Pepper etc.