( Salts ( ( ( interfere ( with ( ( the ( ( uptake and ) transfer ) ) ( of water ) ) ) ) ( through ( ( cell walls ) ( at ( ( heading , ) ( ( a time ) ( when ( ( the plant ) ( has ( a ( high ( water requirement ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Salts)) (VP (VBP interfere) (PP (IN with) (NP (NP (DT the) (NN uptake) (CC and) (NN transfer)) (PP (IN of) (NP (NN water))))) (PP (IN through) (NP (NP (NN cell) (NNS walls)) (PP (IN at) (S (VP (VP (VBG heading)) (, ,) (NP (NP (DT a) (NN time)) (SBAR (WHADVP (WRB when)) (S (NP (DT the) (NN plant)) (VP (VBZ has) (NP (DT a) (JJ high) (NN water) (NN requirement)))))))))))) (. .)))
Salts interfere with the uptake and transfer of water through cell walls at heading, a time when the plant has a high water requirement.
(ROOT (S (NP (RBS Most) (JJ growing) (NN plant) (NNS cells)) (VP (VBP expand) (PP (IN through) (NP (NN water) (NN uptake)))) (. .)))