Vol. 38

Title:
A "FOG" PROPAGATION SYSTEM USED AT PLANT GROWERS AUSTRALIA

Author:
Natalie Peate

pp: 82-83

Abstract:
At Plant Growers Australia (PGA) propagation was previously carried out using conventional misting in polythene houses and, as is usually experienced, both media and foliage were alternately too wet or too dry. The effects were particularly noticeable in summer when foliage became leached of nutrients and then prone to fungal attack. The possibility of creating high relative humidity using fog and consequently reducing leaf transpiration seemed a very suitable alternative to misting.

Two such systems were investigated:

1. pressurized water fog,
2. pressurized air/water fog.

The second system was selected for the following reasons:

1. High pressure water lines used in the first system had been known to burst and could be dangerous in human terms. At that time, operating water pressures were quoted at around 900 psi (6200 kpa). In the air/water system, air pressures were quoted at around 60 psi (413 kpa) and water at about 5 psi (35 kpa), thus much safer. The lower pressures also

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