为什么大规模营养液栽培中要进行营养液的循环流动？
Why the cycling of nutrient solution is needed in large scale nutrient solution culture?
请简要说明营养液栽培与土壤栽培在植物养分供应上的不同点。
Please show the brief differentia between hydroponics and soil culture.
对于火星，他们已经建立了所有的永久性基地驻地的元素模型(有的是数字模型，有的是实体模型)——居住地、研究实验室、营养液栽培花园、甚至还有地面探测车。
And for Mars, they've built models (some digital, some physical) for all the elements of a permanent base-living quarters, research LABS, hydroponic gardens, even the ground-exploration vehicles.
采用回归分析法，通过盆栽试验，研究莴笋无土栽培营养液中大量元素的最优配方。
Pot experiments were carried out to study the optimal prescription of macroelements in nutrient solution for lettuce hydroponics.
目前生产上采用的主要方式有袋培、槽培和少数营养液膜系统栽培。
The main soilless system for commercial production are bag and trough substrate culture, only alittlearea using NFT system.
介绍了营养液膜（NFT）栽培设施的贮液池、供液装置、栽培床等的设计要求和方法。
The designing requirements and methods for tank , solution supplying-device and culture bed of NFT system were fully described in this paper.
营养液配制是无土栽培一个关键的技术问题。
The confection of the nutritious liquid is a important technical problem in the hydroponics.
本发明涉及无土栽培营养液领域。
The present invention relates to the field of nutrient liquor for soilless culture.
通过产液系统、供液系统及栽培系统的协同工作从生活污水中制取营养液在屋顶和壁上水栽培作物。
It extracts the nutrient solution from domestic sewage through the co-operation of solution-generating system, feeding system and cultivating system to success tray agriculture.
通过产液系统、供液系统及栽培系统的协同工作从生活污水中制取营养液在屋顶和壁上水栽培作物。
It extracts the nutrient solution from domestic sewage through the co-operation of solution-generating system, feeding system and cultivating system to success tray agriculture.
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