Hon DAMIEN O'CONNOR: Nitrogen is a critical part of plant growth and has played a big part in the success of the New Zealand agricultural sector. Previously, we've used legumes and clovers to fixate the nitrogen from the atmosphere into the ground. I believe that's a good, sustainable way forward. We have used increasing levels of synthetic nitrogen. We have now put a cap on that and I think farmers are winding back their systems to be more sustainable into the future.