Key issues which the NPSI Board requested should be addressed in the document were: Comment on the place that oxygenation may have in reducing the effects of water logging on production for various irrigation systems and secondary issues such as disease and pathogens at higher water temperatures. How much is understood on the impacts of soil structure on water use efficiency, and in particular, managing the leaching fraction requirements of various soilsΓ Comment on the proposed work by Schrale to investigate issues associated with soil structure decline Other than leaching efficiency and leaching fraction, are there other issues we do not understand that limit plants' water use efficiency and salt disposal within the root zoneΓ