Raws li cov kev xav tau ntawm cov neeg yuav khoom, Lub Hnub Qub Grace tau tsim ib qho kev siv tshuaj chiv tshiab nitrate.Nws yog qhov haum rau daim ntawv thov los ntawm tag nrho cov txheej txheem tsim kev lag luam - hydroponics, dej tsis siv neeg, cov dej ntws pov tseg tsawg, chaw nruab nrab thiab cov khoom siv tshuaj tsuag.
