?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Quemada+Saenz-Badillos%2C+Miguel&rft.aulast=Quemada+Saenz-Badillos&rft.aufirst=Miguel&rft.date=December+2019&rft.title=Differences+in+Farm+Nitrogen+Indicators+at+Farm+Level+in+European+Case+Studies&rft.btitle=Proceedings+of+the+International+Fertilizer+Society&rft.isbn=978-0-85310-472-8&rft.genre=proceeding