( It ( ( is ( ( a ( primary cause ) ) ( of ( eutrophication ( of ( ( ( surface waters ) , ) ( ( in which ) ( ( ( ( ( excess nutrients ) , ) ( usually ( ( nitrogen or ) phosphorus ) ) ) , ) ( stimulate ( algae growth ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ is) (NP (NP (DT a) (JJ primary) (NN cause)) (PP (IN of) (NP (NP (NN eutrophication)) (PP (IN of) (NP (NP (NN surface) (NNS waters)) (, ,) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NP (JJ excess) (NNS nutrients)) (, ,) (NP (RB usually) (NN nitrogen) (CC or) (NN phosphorus)) (, ,)) (VP (VB stimulate) (NP (JJ algae) (NN growth))))))))))) (. .)))
It is a primary cause of eutrophication of surface waters, in which excess nutrients, usually nitrogen or phosphorus, stimulate algae growth.
(ROOT (S (NP (NP (DT An) (NN excess)) (PP (IN of) (NP (NP (NNS fertilizers)) (CC and) (NP (JJ other) (NNS nutrients))))) (VP (VBZ causes) (ADJP (JJ eutrophication) (S (VP (TO to) (VP (VB occur)))))) (. .)))