Deficiency of ______ causes the leaves to develop a dark green colouration.A. Phosphorous B. PotassiumC. SodiumD. None of the above 0 0 votesArticle Rating Subscribe LoginNotify of new follow-up commentsnew replies to my comments Label {} [+] Name* Email* Website Label {} [+] Name* Email* Website 0 Comments Oldest Newest Most Voted Inline FeedbacksView all comments