Commercial use of the electroultrafiltration soil nitrogen test in Ireland on sugar beet and other crops

abonos nitrogenados analyse de sol analytical methods application rates beta vulgaris conduite de la culture crop management cropping systems dose d'application environmental impact fertilisation fertilizer application field experimentation forecasting impact sur l'environnement impacto ambiental ireland irlanda irlande manejo del cultivo measurement mesure muestreo nitrogen fertilizers nutritive value sampling sistemas de cultivo soil testing soil types technique analytique type de sol ultrafiltration valeur nutritive valor nutritivo