London, May 21
England collapsed to 30 for four in the morning after being sent into bat but Stokes and Root shared a fluent fifth-wicket partnership of 161 to lift the gloom at a sun-kissed home of cricket.
Stokes was out for a sparkling 92, including a six and 15 fours, and Root fell for 98 in the final session after another innings of great maturity and class.
Jos Buttler (67) was out lbw from the final ball of the day but Moeen Ali remained unbeaten on 49.
The first hour had belonged to New Zealand as England, reeling from weeks of controversy off the pitch, failed to cope with a rampant Kiwi pace attack.
Adam Lyth, on his debut, nicked Tim Southee to wicketkeeper BJ Watling for seven, Gary Ballance (1) edged Trent Boult to third slip, captain Alastair Cook was caught by Watling, hooking at Matt Henry, for 16 and Ian Bell (1) was bowled by debutant Henry.
Thoughts around the ground may have turned to discarded batsman Kevin Pietersen, who was told last week he would not be selected by England this summer despite scoring a career-best 355 not out for Surrey.
The mercurial right-hander was attending golf's PGA Championship at Wentworth as the top order melted away but the efforts of Stokes and Root at least provided breathing space for beleaguered new England cricket director Andrew Strauss. — Reuters
Brief scores: England 354 for 7 (Stokes 92, Root 98, M Ali 49 no).