The multi-groove type Liquid cultivation device of this creation,Consist essentially of: at least one for contain solid cultivation medium or plant cultivation receptacle without solid cultivation medium,One pumping,And at least two nutrient solution slot； Wherein,The water inlet system of pumping connect through an irrigation pipeline at least one plant cultivation receptacle； Each nutrient solution slot system for storing different nutrient solutions respectively,Each nutrient solution slot system penetrates an outlet pipeline respectively and connect with the water inlet of pumping,Each nutrient solution slot and respectively through a water return pipeline with plant cultivation receptacle connect； AndHave respectively at the outlet pipeline and water return pipeline of each nutrient solution slot of what one to control piper conducting whether valve member. It is planted in cultivation receptacle in order to the crops for being intended to plant can be set to what, and carries out the period of photosynthesis according to crops, cooperation supplies different nutrient solutions, avoids crops because conversion capability is insufficient and accumulates excessive nitrate； It or is that can be changed to sustainable supply crops concentration or the lower nutrient solution of formula in crops close to a period of time before picking time, allow to relatively more positive means, control the nitrate content of crops, it is ensured that crops edible safety, more increase crops are to human body beneficial to content.本創作之多槽式養液栽培裝置，基本上包括有：至少一供盛裝固形栽培介質或無固形栽培介質的植栽容器、一泵浦，以及至少兩個養液槽；其中，泵浦之入水口係透過一灌溉管路與該至少一植栽容器連接；各養液槽係供分別儲存不同的養液，各養液槽係分別透過一出水管路與泵浦之入水口連接，各養液槽且分別透過一迴水管路與植栽容器連接；以及，於各養液槽之出水管路及迴水管路處分別有一用以控制管路導通與否的閥件。俾可將所欲栽種之農作物置於植栽容器內，且依照農作物進行光合作用之時段，配合供給不同的養液，避免農作物因為轉化能力不足而累積過量的硝酸鹽；抑或是，可在農作物接近採收期之前的一段時間，改為持續供給農作物濃度或配方較低的養液，使能夠以相對更為積極的手段，控制農作物之硝酸鹽含量，確保農作物食用安全，更增加農作物對人體有益含量。
