An independent valuation by KordaMentha found the DLF offer was fair to minority shareholders. Wrightson's board, chaired by Agria's Alan Lai, recommended investors support the transaction as the best option to emerge from the firm's strategic review.
If shareholders opt to reject the transaction, that may prompt Agria and the board to take a broader view of the interests of all shareholders, the NZ Shareholders' Association said.
The transaction also needs Commerce Commission and Overseas Investment Office approvals, which aren't a given.
As well as the risk the transaction could leave Wrightson "a shadow of its former self" NZSA chief executive Michael Midgley said there may also be concern as to whether the sale would be in the broader strategic interest of New Zealand.
Similar arguments were mounted when Agria mounted its partial takeover in 2011, however, no local investors were willing to match that price. While the latest review of the Overseas Investment Act will likely allow ministerial discretion to reject transactions based on national interests, no specific power currently exists.
The NZ Shareholders' Association will also vote against re-appointing Agria's Kean Seng U, saying he's acted in Agria's interests rather than those of Wrightson. It will support independent director Ronald Seah's appointment.
Wrightson shares were unchanged at 60 cents.