FAR-reaching effects of increasing rates of the organic and mineral nitrogen fertilizers on the yield and some quality parameters in spinach

abonos inorgánicos abonos nitrogenados abonos orgánicos aplicación de abonos aplicación foliar application foliaire application rates biomasa biomass biomasse dose d'application dosis de aplicación engrais azoté engrais minéral engrais organique fertilisation fertilizer application foliar application inorganic fertilizers nitrogen fertilizers organic fertilizers pigment pigmentos pigments rendement rendimiento spinacia oleracea yields