( ( ( ( ( A ( chemical element ) ) ( necessary ( in ( ( relatively large ) amounts ) ) ) ) ( -LRB- ( usually ( ( ( ( greater ( than 500 ) ) ppm ) ( in ( the plant ) ) ) -RRB- ) ) ) ) ( for ( ( the growth ) ( of plants ) ) ) ) . )
(ROOT (NP (NP (NP (DT A) (JJ chemical) (NN element)) (ADJP (JJ necessary) (PP (IN in) (NP (ADJP (RB relatively) (JJ large)) (NNS amounts))))) (PRN (-LRB- -LRB-) (ADVP (RB usually)) (NP (NP (QP (JJR greater) (IN than) (CD 500)) (NN ppm)) (PP (IN in) (NP (DT the) (NN plant)))) (-RRB- -RRB-)) (PP (IN for) (NP (NP (DT the) (NN growth)) (PP (IN of) (NP (NNS plants))))) (. .)))
A chemical element necessary in relatively large amounts (usually greater than 500 ppm in the plant) for the growth of plants.
(ROOT (S (NP (NNP Plant) (NNP nutrition)) (VP (VBZ is) (NP (NP (DT the) (NN study)) (PP (IN of) (NP (NP (DT the) (JJ chemical) (NNS elements)) (ADJP (JJ necessary) (PP (IN for) (NP (NN plant) (NN growth)))))))) (. .)))