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Key Knowledge: techniques for the prevention of environmental degradation and the rehabilitation of land, soil, water and air
Key Knowledge: techniques for the prevention of environmental degradation and the rehabilitation of land, soil, water and air
To protect our food and fibre industries, it is not enough for producers to just understand degradation; they must actively prevent it and know how to fix it when it occurs.
To protect our food and fibre industries, it is not enough for producers to just understand degradation; they must actively prevent it and know how to fix it when it occurs.
Here we will explore the practical techniques used to protect and restore vulnerable or damaged land.
Here we will explore the practical techniques used to protect and restore vulnerable or damaged land.
Prevention and Rehabilitation Techniques
Prevention and Rehabilitation Techniques
Prevention is always cheaper and more effective than rehabilitation. However, if land has already been damaged, specific rehabilitation techniques can restore its productive capacity.
Have a look at the table on the right, showing some Land and Soil Amelioration Techniques
Land and Soil Amelioration Techniques
Land and Soil Amelioration Techniques
Waterlogging Prevention: Installing raised beds in vegetable or grain systems to elevate plant roots above the saturated zone, allowing excess water to drain into furrows.
Salinity Rehabilitation: Planting salt-tolerant vegetation (halophytes) like saltbush in damaged zones to lower the local water table, combined with strategic reforestation higher up in the landscape catchment.
Dust Mitigation: Planting multi-row native shelterbelts (windbreaks) perpendicular to prevailing winds to reduce wind velocity and prevent fine topsoil from becoming airborne dust.
Emissions Reduction: Adding dietary supplements like specific seaweeds or oils to ruminant livestock feed to reduce the generation of methane gas from enteric fermentation.
Just to get you thinking, your task today is to solve a land management puzzle backwards.
Below is a list of tools currently sitting in a farmer's shed. You need to write a short scenario where the farmer was forced to buy exactly two of these items because they failed to prevent degradation in the past.
The Shed Inventory: One tonne of agricultural lime, a drone with an NDVI camera, a deep-ripper attachment, 500 native tree tube-stocks, and a laser-guided raised bed former.
Example Answer: > A beef producer in Gippsland constantly grazed heavy cattle on wet pastures during winter. This caused severe soil compaction and blocked water drainage. To rehabilitate the land, the producer had to buy a deep-ripper attachment to break up the hardpan soil and a laser-guided raised bed former to lift the next crop's roots out of the stagnant water.
Question 1 (2 Marks)
Question 1 (2 Marks)
Describe how controlled traffic farming acts as a preventative strategy against soil compaction.
Question 2 (4 Marks)
Question 2 (4 Marks)
A farm catchment in northern Victoria is suffering from severe dryland salinity. Analyse how planting deep-rooted native trees on the hillsides can rehabilitate the water and soil quality in the valley below.
Interactive Task: The Six-Word Management Plan
Interactive Task: The Six-Word Management Plan
To practice your ability to summarise complex strategies tightly for exams, complete this challenge. NOTE: Please do NOT do this as your answer in an exam!
The Task: Review the prevention and rehabilitation techniques on this page. Choose one specific degradation issue and write a six-word summary that captures both the problem and the sustainable solution.
Example (Erosion): Bare soil blows away; keep stubble.
Example (Acidity): Sour soil stalls growth; add lime.
Write your six-word pitch in your workbook and explain the biological mechanism behind your choice to a peer.
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