Effects of various concentration ratios of HN4-N to NO3-N on the root development of trifoliate orange seedlings (Poncirus trifoliata Raf.) under high or low calcium level in solution culture

alkaline earth metals amendement du sol anatomia anatomie anatomy arbustos ornamentales azote biological development calcio calcium crecimiento croissance crops cultivos developmental stages dicotiledoneas dicotyledons economic plants elements enmiendas del suelo etapas de desarrollo etapas de desarrollo de la planta fisiologia fonction physiologique gases gaz geraniales growing media growth medio de cultivo metal metales metales alcalinoterreos metals nitrogen no metales nonmetals nutrient solutions ornamental plants ornamental shrubs physical states physiological functions physiologie physiology plant anatomy plant developmental stages plantas plantas ornamentales plante plante de culture plante ornementale plants plantule poncirus trifoliata racine roots rootstock crops rutaceae seedlings soil amendments soluciones nutritivas solution nutritive storage organs substrat de culture