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Protection Limits

The temperatures in the table below are the minimum temperatures where our machines still had good results. The data in the table below are not “absolute” values. We regularly adapt these values, based upon new experiences from our customers and from some Research Centres.

The critical temperatures also depend on the stage of flowering and the size of the fruits. For example: we had good results at -8 to -9 °C in pears in the stage “white bud”, while the table here shows -5,5 °C for “full flowering”. So in certain flowering stages, the minimum temperatures where we can provide protection are lower.

  FrostbusterFrostGuardWind machine *
Radiation FrostRelative Humidity
Full Flowering> 85 %- 5,5 °C- 5,5 °C- 5 °C
Full Flowering< 85 %- 3,5 °C- 3,5 °C- 3 °C
Fruits> 85 %- 3,5 °C ***- 3,5 °C ***- 3,5 °C ***
Fruits< 85 %no resultno resultno result
Wind FrostRelative Humidity
Full Flowering > 85 -4,5 °C -4,5 °C no result
Full Flowering< 85 %no resultno resultno result
> 85 %-3,5 °C-3,5 °Cno result
Fruits< 85 %no resultno resultno result

* = the capacity of a wind machine depends a lot on the temperature and the eventual use of an extra heating system and of course of the quality of the inversion layer. The protected area varies between 1 to 2 ha (at -5 °C) and 5 to 6 ha (-3 °C).

*** = also depending on the size of the fruits: the bigger the fruits, the more difficult to protect