Parts per million (ppm): a ratio figure that represents the amount of one substance that is in one million parts of another substance; commonly used to describe the relative concentrations of nutrient solutions.
Chlorine: 1-3 parts per million
After this, make sure you remove any deck equipment that may be attached.
Researchers exposed soybeans to normal (380 parts per million) and high (550 parts per million) levels of CO2 in the field. This high level of CO2 is expected to be the norm in our atmosphere by 2050.
0 parts per million of dissolved oxygen in 90 degree F. water. Koi and goldfish start showing signs of stress at oxygen levels of 4.0 ppm and will start dying at 3.0 ppm. The higher the water temperature goes the less oxygen that's available.
In order to kill soil microorganisms to 6 inch soil depth, water containing 65 parts per million of chlorine was required in one study. Drinking water usually contains much lower chlorine levels.
Soils naturally contain copper in some form or other, ranging anywhere from 2-100 parts per million (ppm) and averaging at about 30 ppm. Most plants contain about 8-20 ppm. Without adequate copper, plants will fail to grow properly.
If fluorides are present in just a few parts per million (ppm), they can 'burn' sensitive houseplants, like zebra plant (Aphelandra).
TRACE ELEMENTS - Chemical elements present in exceedingly small quantities. (PPM - parts per million).
TRANSPIRATION - The release of moisture through the leaves of a plant.
While pH and other levels will vary naturally, aim for a pH of between 6.8 and 9 and an alkalinity level of between 100 and 300 parts per million. You can add substances to adjust the pH, but only use chemicals approved for use with live fish.
The ingredient in peppers that makes the "hot" sensation is called Capsaicin. A sweet green pepper is devoid of this chemical. The hotter the pepper, the more the level of Capsaicin. It is measured in parts per million (ppm).
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Although the explanatory pamphlet emphasized that nitrogen "is essential" to plant growth, there was no indication whether our 10 ppm (parts per million) was low, medium or high.
In Adelaide the existing salt levels from the River Murray are already high, and combined with reused water the salt levels can be between 600 and 1200 parts per million of salts, so in the Adelaide area this is a particular local challenge.
 See also: Plant, Level, Carbon, Water, Soil
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