( Necessary ( ( Nutrients ( Sixteen elements ) ) ( ( are ( essential ( for ( plant growth ) ) ) ) . ) ) )
(ROOT (S (ADVP (RB Necessary)) (NP (NNP Nutrients) (NNP Sixteen) (NNS elements)) (VP (VBP are) (ADJP (JJ essential) (PP (IN for) (NP (NN plant) (NN growth))))) (. .)))
Necessary Nutrients Sixteen elements are essential for plant growth.
(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)))))))) (. .)))