( It ( ( ( ( 's ( ( caused ( by ( ( a deficiency ) ( of iron ) ) ) ) ( in ( the soil ) ) ) ) and ) ( ( is easily ) ( corrected ( by ( ( adding ( an ( iron supplement ) ) ) ( to ( ( the soil ) ( around ( the plant ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VP (VBZ 's) (VP (VBN caused) (PP (IN by) (NP (NP (DT a) (NN deficiency)) (PP (IN of) (NP (NN iron))))) (PP (IN in) (NP (DT the) (NN soil))))) (CC and) (VP (VBZ is) (ADVP (RB easily)) (VP (VBN corrected) (PP (IN by) (S (VP (VBG adding) (NP (DT an) (NN iron) (NN supplement)) (PP (TO to) (NP (NP (DT the) (NN soil)) (PP (IN around) (NP (DT the) (NN plant))))))))))) (. .)))
It's caused by a deficiency of iron in the soil and is easily corrected by adding an iron supplement to the soil around the plant.
(ROOT (S (NP (NP (NNP Iron)) (PP (IN in) (NP (DT the) (NN soil)))) (VP (VBZ causes) (S (NP (NNS mars)) (VP (TO to) (VP (VB look) (ADJP (JJ red)))))) (. .)))