Changes in leaf yield and nutritive quality of the black nightshade (Solanum nigrum) as influenced by nitrogen application

abonos abonos nitrogenados acide ascorbique acido ascorbico ammonitrate ascorbic acid azote calcio calcium calcium ammonium nitrate calidad carotenoide carotenoides carotenoids chemical composition composition chimique corps gras engrais fats fertilizers grasas hortalizas de hoja leaf vegetables magnesio magnesium nitrogen nitrogen fertilizers nutrition des plantes nutritive value oxalate oxalates oxalatos phenolic compounds plant nutrition potasio potassium proteine proteins quality solanum nigrum valeur nutritive valor nutritivo