( ( ( ( This system ) ( -LRB- ( RPM -RRB- ) ) ) ( has ( ( accelerated ( ( the growth ) ( of oaks ) ) ) ( to ( ( ( grow ( as fast ) ) ( as ( native trees ) ) ) ( such ( as ( ( ash or ) locust ) ) ) ) ) ) ) ) ( , ( ( plus ( acorn prodution ) ) ( ( has ( been ( observed ( on ( many ( 3-year ( old ( planted trees ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (NP (DT This) (NN system)) (PRN (-LRB- -LRB-) (NP (NNP RPM)) (-RRB- -RRB-))) (VP (VBZ has) (VP (VBN accelerated) (NP (NP (DT the) (NN growth)) (PP (IN of) (NP (NNS oaks)))) (S (VP (TO to) (VP (VB grow) (ADVP (RB as) (RB fast)) (PP (IN as) (NP (JJ native) (NNS trees))) (PP (JJ such) (ADJP (RB as) (JJ ash) (CC or) (JJ locust))))))))) (, ,) (NP (IN plus) (NN acorn) (NN prodution)) (VP (VBZ has) (VP (VBN been) (VP (VBN observed) (PP (IN on) (NP (JJ many) (JJ 3-year) (JJ old) (JJ planted) (NNS trees)))))) (. .)))
This system (RPM) has accelerated the growth of oaks to grow as fast as native trees such as ash or locust, plus acorn prodution has been observed on many 3-year old planted trees.
(ROOT (S (NP (NP (DT An) (NN acorn)) (VP (VBG growing) (PP (IN into) (NP (DT an) (JJ adult) (NN tree))))) (VP (MD will) (VP (VB take) (NP (DT the) (JJS longest) (NN time)) (S (VP (TO to) (VP (VB observe)))))) (. .)))