AT THE TOP: Kane Williamson notched Northern Districts' highest total in an innings with his 252 not out against Wellington at Lincoln.

Black Caps batsman Kane Williamson has hit the highest ever score by a Northern Districts player, as he led the Knights to complete control against Wellington on day two of their Plunket Shield match in Lincoln today.

Williamson finished the day unbeaten on 252 to become the highest innings scorer in the province's history and notch just the seventh double century by a Knights player.

The 21-year-old led Northern to 540-6 at stumps on day two at Lincoln No 3, which gave his side a massive 378-run-lead after Wellington were rolled for 162 on Monday.

Resuming at 156-1, ND piled on 384 runs in 97 overs, with Williamson, starting the day on 76, knocking off runs at will, against an all-current-or-former Black Caps attack.

He has hit 28 fours and a six in his 369-ball, 548-minute innings.

Knights captain Brad Wilson was out early in the day for 85, then Williamson got support from James Marshall (62) and Daniel Vettori (48), before Corey Anderson and Peter McGlashan each added 26.

Graeme Aldridge is 16 not out.

Williamson went past Northern's next highest individual score of 241, which was made just last season by Daniel Flynn.

Scoreboard at stumps on day two of Plunket Shield match between Northern Districts and Wellington at Lincoln:

WELLINGTON

First innings 162

NORTHERN DISTRICTS

First Innings

B Wilson c J Austin-Smellie b M Gillespie 85

B Watling c G Elliott b MR Gillespie 4

K Williamson not out 252

J Marshall c M Papps b M Gillespie 62

D Vettori lbw b J Patel 48

C Anderson c & b L Woodcock 26

P McGlashan c J Ryder b A McKay 26

G Aldridge not out 16

Extras (B 2, Lb 9, Wd 0, Nb 10) 21

Total (for 6 wickets in 139.0 overs) 540

Fall of wicket: 1-19 (BJ Watling, 6.1), 2-196 (BS Wilson, 55.2), 3-315 (JAH Marshall, 84.6), 4-399 (DL Vettori, 102.3), 5-476 (CJ Anderson, 123.5), 6-517 (PD McGlashan, 133.1)

Bowling: M Gillespie 29-2-123-3, J Franklin 16-3-53-0, G Elliott 10-3-28-0, A McKay 30-3-137-1, J Patel 41-6-118-1, L Woodcock 13-0-70-1.