Improved method of nitrogen application in the vineyards

abonos nitrogenados acide humique ammonium sulphate azote biofertilisant biofertilizantes biofertilizers calidad combinaciones de abonos crop yield engrais organique fertilisation fertilizer application fertilizer combinations grape juice grapevines humic acids jus de raisin levadura levure nitrate nitrates nitratos nitrite nitrites nitritos nitrogen nitrogen fertilizers organic fertilizers quality rendement des cultures rendimiento de cultivos saccharomyces cerevisiae sulfate d'ammonium sulfato de amonio vid vigne vitis vinifera yeasts zumo de uva