[Influence of cultivation measures in silage maize production on the yield and nitrate content in soil profiles. I. Layout of the experiment, methods and preliminary results]

agua del suelo band placement cover plants crop yield cultivation cultivo cultivo intercalado culture intercalaire eau du sol esparcimiento en fajas essai fertilidad del suelo intercropping nitrate nitrates nitratos plantas de cobertura plante de couverture pratique culturale pruebas rendement des cultures rendimiento de cultivos soil fertility soil water trials zea mays