Underperforming sandy soils - targeting constraints for cost effective amelioration
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(Published version)
Date
2019
Authors
MacDonald, L.
McBeath, T.
Llewellyn, R.
Moodie, M.
Desbiolles, J.
Saunders, C.
Ucgul, M.
Fraser, M.
Wilhelm, N.
Davenport, D.
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Conference paper
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Proceedings from the Grains Research and Development Corporation (GRDC), 2019, pp.79-84
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2019 Adelaide GRDC Grains Research Updates (12 Feb 2019 - 13 Feb 2019 : Adelaide, Australia)
Abstract
Know the water limited yield potential and target the soil constraints to crop water-use: Assessing the yield gap relative to expected gains and seasonal risks, alongside identifying the key soil constraints, are important in developing an amelioration plan with cost effective outcomes.
Yield responses to physical disruption are common but not guaranteed: Considering the depth and severity of compaction, any co-occurring constraints, and machinery specific impacts on soil strength offer an opportunity to optimise decisions for cost effective outcomes.
Yield responses to increasing fertility at depth (i.e. deep placement/incorporation) are highly dependent on seasonal conditions with risks of neutral or negative yield responses in dry years. Depth of placement and form of nutrition (fertiliser, chicken litter, plant biomass) offer potential to manage nutrient carryover and crop growth responses over multiple years.
Long term effects are essential for cost effective amelioration outcomes. Economic analysis of long-term trials (five years) has highlighted the importance of seasonal and crop sequence response effects on the cost benefit outcomes.
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Copyright 2019 GRDC