BOONE — Iowa farm, research and political leaders Tuesday hailed the fifth anniversary of the state’s groundbreaking nutrient reduction strategy designed to improve water quality, but said the demonstration phase has ended and the time for aggressive implementation has begun.”As we look to the next five years and beyond, we know that we need to continue to scale up our efforts to implement practices across the state,” Iowa Agriculture Secretary Mike Naig told a group gathered at the Iowa State University BioCentury Research Farm near Boone to mark the occasion.“We have a lot of work to do.