[Temporary model for forecasting mineral nitrogen content in soil in spring]

abonos nitrogenados aplicaciones del ordenador application des ordinateurs azote cereales cereals chimie du sol computer applications computer software crop yield cultivos de invierno culture d'hiver fertilisation fertilizer application field experimentation forecasting latvia letonia lettonie linear models loam soils logiciel modelos lineales nitrogen nitrogen content nitrogen fertilizers podzol podzoles podzols programas de ordenador recherche rendement des cultures rendimiento de cultivos research soil chemistry soil types sol sablolimoneux statistical methods suelo franco teneur en azote tipos de suelos type de sol winter crops