The water tower at Weilmoringle,catches all available rain |
Farming in Australia takes place on the more dry land inland, because urban development has built up on the coast and near the harbours. Farmers are used to these challenging environments and have become very adept at coping with them. They grow crops that suit the environment, use irrigation to overcome that environment and have industralised farming to be able to maximise their production.
Irrigating wheat in Hillston NSW |
As Rural Agronomist from Moree, Bruce Crosby,* explains-
" In all cases the further inland,the less reliable the rainfall and hence the type of agricultural production.Farmers understand the peculiarities of their local environment and adjust their operations accordingly to give the most economic returns for that environment.
The Australian
climate has always been variable in the extremes and following cycles short and
long.
We can roughly divide
Eastern Australia into three regions:-
Southern - South
Australia, Victoria and Southern New South Wales -
Viewing irrigation channels at Merriwagga ,near Hillston. |
A Mediterranean zone with predominantly winter rainfall, mainly
during a period of low evaporation, making small falls of rain
effective for winter crop growth.This zone relies on
rainfall in crop for a good result - fallow moisture is of less significance depending on soil type.
Depending on actual
location, in any five years, you would expect to get 2 or 3 years average or above and a couple below.A total
failure is rare, although 2001 to 2010 was an extra dry period which I will come back to.
Mid zone - From Dubbo and north to say Condamine in Queensland.
Mid zone - From Dubbo and north to say Condamine in Queensland.
We used to call this "the
Doldrums zone" where the centres of the highs pass over - generally light winds, extremely variable rainfall
periods, usually consisting of wet periods followed by long dry
periods at any time of the year, although most bigger falls will be summer or
winter. Fallow moisture is critical for good crops
and these areas generally have soils that will hold large amounts of moisture
for in crop use. Individual falls of less than 20mm are not usually effective This zone can successfully
grow summer and winter crops because of this rainfall and soil configuration, making it one of the most
reliable farming zones in Australia.
Northern zone- rest of Queensland - summer rainfall - rely on monsoon rainfall. Away from the coastal fringe mostly livestock production based on perennial summer grasses.
Northern zone- rest of Queensland - summer rainfall - rely on monsoon rainfall. Away from the coastal fringe mostly livestock production based on perennial summer grasses.
An example of
rainfall pattern variability are Hamilton in Victoria and Armidale in NSW. Both
have a 36 inch (approx 900mm) rainfall but the predictably of when it rains is
approx 90% for Hamilton and 36% for Armidale. Hamilton is a very Mediterranean
winter rainfall and Armidale anytime, any season.
On top of these zones
of weather behaviour we then have to add large time climate shifts. For example
the early part of the 1900's up to 1947 is considered by the Bureau of Meteorology
to be a much drier period than the fifty years from 1947 to 2002, which is
classified as being wetter than average.
So are we now entering 50 years of a
period drier than the past a period, which the current farmers have not experienced
in their working lifetime?
This may see a shift in the type of production in an area or a change in techniques that will enable better performance under those conditions - conservation farming techniques used today have made great changes to the reliability of cropping in the more marginal areas already. Many people are not aware of how much farmers have already adapted to conservation farming techniques.
Farmers supplement their income by mustering and harvesting feral goats.. |
This may see a shift in the type of production in an area or a change in techniques that will enable better performance under those conditions - conservation farming techniques used today have made great changes to the reliability of cropping in the more marginal areas already. Many people are not aware of how much farmers have already adapted to conservation farming techniques.
As we can see farmers are very capable at adapting to changing environments but there is another major factor over which they have very little control - Terms of Trade.
We will investigate this aspect of the farming life next week.
* Blog information, this week and next, is largely quoted, or summarised, from an article by-
Bruce Crosby, Agricultural Consultant for Dupont Pioneer Hi-Bred Seeds and Soil and Tissue Sampling and Testing and a member of Moree-Narribri Uniting Church, in response to a request from the Rural Chaplains for information on this topic.