China will implement an upgrade to the free trade agreement between Beijing and Wellington to eliminate tariffs of 12 wood and paper products imported from New Zealand from April 7, the Ministry of Finance said on Sunday.  The move follows the deal signed by the two governments in January to upgrade their existing free trade pact, allowing 99% of New Zealand's $3 billion wood and paper trade to China to receive tariff-free access over a 10-year implementation period.  Import tariffs for products such as toilet or facial tissue stock and paper used for ...