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Glossary
of terms: IJKL
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| Inert: |
chemically non-reactive, for example inert growing material. Controlling
the nutrient solution is made easy because the growing medium is
inert. |
| Insecticide: |
any
substance that kills insects.
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| Internode: |
the
portion of a stem found between 2 successive nodes. |
| Ion:
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an atom that carries a charge due to loss or gain of electrons. |
| Jiffy-7
pellet: |
compressed
peat moss, wrapped in plastic. When moistened, it expands into a
small pot that is used to start seeds or cuttings. |
| Kelvin: |
an absolute scale temperature where a range of 1 Kelvin (K) is equal
to a range of 1degree Celsius. |
| Leach: |
dissolve or remove nutrients or other substances from growing mediums
by the percolation of water. |
| Leader: |
see
Meristem. |
| Leaf
blade: |
that
part of the leaf where photosynthesis takes place. |
| Leaf
curl: |
leaf
malformation due to over watering, over fertilisation, lack of magnesium,
or insect or fungus damage. |
| Leaflet:
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small
immature leaf. |
| Leaf
Whorls: |
a
circular set ( 2 or more) of leaves arising at the same level on
the plant. |
| Lime:
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used
to raise and stabilise Ph. |
| Litmus
paper: |
paper
used for testing acidity/alkalinity. |
| Lumen: |
measurement
of light output, one lumen is equal to the amount of light emitted
by one candle that falls on one square foot of surface located one
foot away from the candle. |
| Lux: |
measurement
of lumens or light. |
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