By applying which of the following practices, contamination of hydroponics plants can be reduced? |
|||
a) |
Change the medium every week |
b) |
Do not use tools from the outdoor garden |
c) |
Complete aeration in hydroponic tank |
d) |
All of the above |
By applying which of the following practices, contamination of hydroponics plants can be reduced? |
|||
a) |
Change the medium every week |
b) |
Do not use tools from the outdoor garden |
c) |
Complete aeration in hydroponic tank |
d) |
All of the above |
An essential element is that which |
|||
a) |
Improves health of the plant |
b) |
Is irreplaceable and indispensable for growth of plants |
c) |
Is found in plant ash |
d) |
Is available in the soil |
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