Heavy and pts.

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PROBLEM TO BE SOLVED : To provide a rubber composition for a base tread, capable of highly satisfying both of low fuel consumption and heat deterioration resistance, and to provide a heavy-duty tire having a base tread produced using the same.SOLUTION : The rubber composition for a base tread includes a modified natural rubber having a phosphorus content of ≤200 ppm and a compound represented by formula (1), wherein A represents a 2-10C alkylene group, and Rand Rare the same or different and represent a nitrogen atom-containing monovalent organic group.