What is different about the changes that occur in the nutrient solution to be recycled within a NFT versus an ebb-and-flood system?
What will be an ideal response?
In the NFT system the solution passes over the plant roots where it is
radically altered in its nutrient content and pH level. In the ebb-and-flood system
the solution to be recycled does not enter the pot or the root substrate. Therefore, it
is for the most part unaltered except for the loss of some water through
evaporation.
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This hardness testing system is performed by placing a known load, using a ball of specified diameter, in contact with the material surface. The diameter of the resulting impression in the material is measured.
a. Brinell b. Rockwell
Food security is where all members of a household have access to enough food and a healthy lifestyle and sufficient financial resources to acquire food as it is needed
Indicate whether this statement is true or false.
In a three-point perspective, the picture plane is situated as closely as possible to the observer.
Answer the following statement true (T) or false (F)
Consider a modulating wave m(t) that consists of a single frequency component and is defined as:
m(t) = Am cos(2? fmt) where Am is the amplitude of the modulating wave and fm is the frequency. The sinusoidal carrier wave has amplitude Ac and frequency fc. The signal is amplitude modulated to produce the signal s(t). Find the average power delivered to a 1-? resistor by s(t).