A solution phase polymerization process to make an ethylene copolymer in a multi-zone reactor system, the multi-zone-reactor system comprising a first, second and third polymerization zone, wherein the first polymerization zone is defined by a first tubular reactor having an inlet and an outlet, the polymerization process comprising: feeding solvent, hydrogen, a Ziegler-Natta polymerization catalyst, ethylene, and at least one alpha olefin having 4 to 8 carbon atoms, to the inlet of the first tubular reactor to initiate a polymerization reaction; feeding hydrogen to at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; wherein at least 80 weight percent of the total amount of hydrogen added to the multi-zone reactor system, is added to the at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; and wherein from 20 to 50 weight percent of the total amount of ethylene copolymer made in the multi-zone reactor system is made in the first tubular reactor. the multi-zone-reactor system comprising a first, second and third polymerization zone, wherein the first polymerization zone is defined by a first tubular reactor having an inlet and an outlet, the polymerization process comprising: feeding solvent, hydrogen, a Ziegler-Natta polymerization catalyst, ethylene, and at least one alpha olefin having 4 to 8 carbon atoms, to the inlet of the first tubular reactor to initiate a polymerization reaction; feeding hydrogen to at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; wherein at least 80 weight percent of the total amount of hydrogen added to the multi-zone reactor system, is added to the at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; and wherein from 20 to 50 weight percent of the total amount of ethylene copolymer made in the multi-zone reactor system is made in the first tubular reactor. feeding solvent, hydrogen, a Ziegler-Natta polymerization catalyst, ethylene, and at least one alpha olefin having 4 to 8 carbon atoms, to the inlet of the first tubular reactor to initiate a polymerization reaction; feeding hydrogen to at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; wherein at least 80 weight percent of the total amount of hydrogen added to the multi-zone reactor system, is added to the at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; and wherein from 20 to 50 weight percent of the total amount of ethylene copolymer made in the multi-zone reactor system is made in the first tubular reactor. wherein at least 80 weight percent of the total amount of hydrogen added to the multi-zone reactor system, is added to the at least one location in the first tubular reactor which is downstream from the inlet of the first tubular reactor; and wherein from 20 to 50 weight percent of the total amount of ethylene copolymer made in the multi-zone reactor system is made in the first tubular reactor.