What is the primary difference between a static or standing solution hydroponic system and a flowing solution hydroponic system?
the nutrient solution is slowly re-circulated in the flowing system
the nutrient solution in slowly re-circulated in the static system
the solution pH must be kept higher in a static system
the solution must be kept lower in a static system
none of the above
What is the name of the hydroponic system in which a thin layer of nutrient solution is allowed to flow over the roots that are inside of a trough?
intermittent subirrigation system
bag culture system
static nutrient system
root misting system
nutrient film system
At what approximate interval is the root system of the plants misted or sprayed with a nutrient solution in a root misting hydroponic system?
2 to 3 minutes
30 minutes
60 minutes
120 minutes
180 minutes
Which substrates may be used in a bad culture hydroponic system?
perlite
sand
rockwool
coir
all of the above
Nutrient solution to be reused in rockwool slab hydroponic system may be passed through large container of sand before reuse. What purpose does this serve?
to remove bacteria
to remove viruses
to remove debris such as roots and leaves
none of the above
all of the above
Nutrient solution to be reused in rockwool slab hydroponic system may be passed over ultraviolet lights or treated with ozone before reuse. What purpose does this serve?
to kill bacteria and fungi
to oxidize debris such as roots and leaves
to reduce the pH of the nutrient solution
all of the above
none of the above
If the electrical conductivity of the drain water (nutrient solution draining ffrom the rockwool slab) in a rockwool slab hydroponic system is significantly lower than the desired level, what action is likely to be taken by the manager?
fresh water will be blended with the drain water
concentrated fertilizer solution will be added
the drain water will be passed through a sand filter to increase the E.C.
none of the above
all of the above
If the electrical conductivity of the drain water (nutrient solution draining from the rockwool slab) in a rockwool slab hydroponic system is significantly higher than the desired level, what action is likely to be taken by the manager?
fresh water will be blended with the drain water
concentrated fertilizer solution will be added
irrigate the crop with fresh water for a few cycles