Evaluation of different organic fertilization techniques in floriculture: experimental trial on Calendula officinalis

abonos fosfatados acide nitrique acido nitrico agricoltura biologica agriculture biologique ammonium nitrate analisi istologica analyse de tissus application rates area fogliare azote azoto calcium nitrate calendula chemical composition coltura in vaso colture in serra composition chimique composizione chimica concimazione concimi fosfatici crop yield cultivo en contenedor cultivos de invernadero culture en conteneur diameter diametro dose d'application dosi di applicazione fer ferro fertilisation fertilizer application feuille foglie fosforo greenhouse crops hierro hiver hojas infiorescenze inflorescence inflorescences inflorescencias inverno invierno iron leaf area leaves micorrize mycorrhizae nitrate d'ammonium nitrate de calcium nitrate de potassium nitrato ammonico nitrato de amonio nitrato de calcio nitrato de potasio nitrato di calcio nitric acid nitrogen organic agriculture ornamental plants pepiniere phosphate fertilizers phosphore phosphorus piante ornamentali plant nurseries plantas ornamentales plante de serre plante ornementale pot culture potasio potassio potassio nitrato potassium potassium nitrate primavera printemps racine radici rendement des cultures rendimiento de cultivos roots solfati spring sulfate sulfatos sulphates superficie foliar surface foliaire tissue analysis vivai di piante viveros winter