( Hydroponics ( ( ( ( ( ( is ( ( the art ) ( of ( growing plants ) ) ) ) , ) ( usually ( without soil ) ) ) , ) ( ( using ( water-soluble fertilizers ) ) ( as ( ( the ( main ( or ( sole source ) ) ) ) ( of nutrients ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Hydroponics)) (VP (VBZ is) (NP (NP (DT the) (NN art)) (PP (IN of) (NP (VBG growing) (NNS plants)))) (, ,) (PP (ADVP (RB usually)) (IN without) (NP (NN soil))) (, ,) (VP (VBG using) (NP (JJ water-soluble) (NNS fertilizers)) (PP (IN as) (NP (NP (DT the) (JJ main) (CC or) (JJ sole) (NN source)) (PP (IN of) (NP (NNS nutrients))))))) (. .)))
Hydroponics is the art of growing plants, usually without soil, using water-soluble fertilizers as the main or sole source of nutrients.
(ROOT (S (NP (PRP It)) (VP (VBZ is) (ADJP (JJ important) (S (VP (TO to) (VP (VB protect) (NP (NN soil)) (SBAR (IN because) (S (NP (PRP it)) (VP (VBZ has) (ADVP (RB nutrients)) (VP (VBN used) (PP (IN by) (NP (NNS plants))) (S (VP (TO to) (VP (VB grow))))))))))))) (. .)))
It is important to protect soil because it has nutrients used by plants to grow.