[Growing technique. Fertilizing with nitrogen and covering with fibre cloth in the early potato variety Rutt]

abonos nitrogenados azote calcium nitrate cobertura seca contenido de materia seca crop yield cubrimiento del suelo dry matter content dry mulches fertilisation fertilizer application harvesting date mulch sec mulching nitrate de calcium nitrato de calcio nitrogen nitrogen fertilizers noruega norway paillage rendement des cultures rendimiento de cultivos solanum tuberosum stems tallo tige tubercule tubers