TAILIEUCHUNG - SUSTAINABLE AGRICULTURE 2nd Edition - Part 9

9 Managing plants – Tree plantings and windbreaks Trees play an important role in ensuring that our agricultural lands remain in good health. Much of Australia’s farmland has been extensively cleared. Many of our remaining trees in agricultural areas are in poor health | .9 Managing plants -Tree plantings and windbreaks Trees play an important role in ensuring that our agricultural lands remain in good health. Much of Australia s farmland has been extensively cleared. Many of our remaining trees in agricultural areas are in poor health many suffering from die-back. Important reasons for having trees on farms Erosion control Trees help control or reduce erosion in several ways including By their roots binding soil particles together By acting as windbreaks decreasing the wind s ability to dislodge and move soil particles Acting as a physical barrier trapping moving soil particles Reducing the erosive potential of rainfall by providing a protective cover over the soil below Intercepting rainfall which then either 1 Evaporates back into the atmosphere without ever reaching the ground 2 Drips slowly from the tree foliage reducing the potential for surface runoff longer time available for water to infiltrate into the soil hence reducing the likelihood of surface erosion 3 Flows down the branches and trunks of the trees eventually reaching the ground with far less erosive power energy than if it had dripped or fallen directly onto the ground surface Lowering watertables Trees help lower watertables reducing waterlogging of surface soils and salinity problems. Clear felling on farm land has resulted in the rising of watertables to the detriment of crops 156 Sustainable Agriculture and other native plants. This has become a major problem for vast areas of Australia. Saline soil hinders roots development and nutrient and water uptake due to high salt content. Sheltering stock Trees provide vital shelter for farm animals. Stock suffering from heat stress are more likely to pollute dams and waterways. Research shows that shelter can improve milk production ram fertility and stock liveweight. Shelter also reduces deaths of lambs and sheep from exposure during cold or wet weather. Windbreaks Windbreaks protect grazing animals and crops from .

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