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aj 1.interval planting and succession planting are same thing:the term means plant the same crop several times over a period of time to spread out the harvest. example: if plant 4 blocks of same variety of corn. one block ever weekspreads the harvest over 4 weeks.2.succession cropping: is plant two different crops one after the other is finished.
aj don't know since don't use that term
the book title is following" Tactical Vegetable Gardening: A guide to Succession Cropping,Interval Cropping &Companion planting.