French to English Science Wine / Oenology / Viticulture Planting of test vineyard

The phrase comes from an article on the planting of a vineyard for testing fertilizers and soil maintenance. The full sentence is: "La parcelle a ete subdivisee en 15 parcelles elementaires de 2,7 ares (8 inter rangs de 7 intermediaires) auxquelles il faut ajouter 10 zones temoins de 8 inter rangs sur 3 intermediaires. I think I can translate "inter rangs" as "inter-rows" but cannot find any references to "intermediaires" in this context.