When leaves of crop plants show brownish coloration from the tips of the mid-ribs backward, they are showing deficiency symptom of? by Sunday | Jul 11 | Agricultural Science WAEC | 0 comments A. magnesium B. zinc C. nitrogen D. copper E. phosphorus Correct Answer: Option E – phosphorus Users Also Read These:The physiological changes that show up during…The brownish flattened and leaf-like parasite found…Poor growth and yellowing of leaves in plants is due…The deficiency symptom peculiar to vitamin B in…Chlorosis observed along the veins of leaves is a…