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acidity

Catalogue: GRDC Updates
The practice has corrected surface acidity but values of subsurface (typically 10-20 cm) pHCa< 4.5 are now common, leading to development of an acid throttle, sandwiched between the limed surface and the naturally neutral or alkaline subsoil... On the basis of three experiments in 2007, where we injected lime into acid (pHCa 4.0 - 4.3) subsurface layers, apparently not much... The uniformity of the effect of lime injection was measured at Milvale and found to be uneven across the rip-lines, with an increase of pHCa from 4.3 to >6 in the rip lines, but little change between the rips...
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Catalogue: GRDC Media
A new report outlines actions taken by the Grains Research and Development Corporation (GRDC) in response to local priority issues identified by Western Australian grain growers... The GRDC's 2014-15 Regional Cropping Solutions Networks (RCSNs) Annual Report provides a summary of recent activities initiated by WA's five RCSNs, and an overview of the GRDC's investment planning process for grains research, development and extension (RD&E)... High priority issues identified in 2014-15 by WA RCSNs include profitable rotations; subsoil constraints; acidity; herbicide resistance; nematodes and soil-borne diseases; canola and the need for better agronomic packages for this crop; frost; non-wetting soils; management of seasonal and soil variability; and business management...
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Catalogue: GRDC Media
A new report outlines actions taken by the Grains Research and Development Corporation (GRDC) in response to local priority issues identified by Western Australian grain growers... The GRDC's 2014-15 Regional Cropping Solutions Networks (RCSNs) Annual Report provides a summary of recent activities initiated by WA's five RCSNs, and an overview of the GRDC's investment planning process for grains research, development and extension (RD&E)... High priority issues identified in 2014-15 by WA RCSNs include profitable rotations; subsoil constraints; acidity; herbicide resistance; nematodes and soil-borne diseases; canola and the need for better agronomic packages for this crop; frost; non-wetting soils; management of seasonal and soil variability; and business management...
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Catalogue: GRDC YouTube channel
3.74: GCTV Ep#8 Liming Acid Soils 4.08: Narrator: Soil acidity is wide spread throughout Western 6.51: Australia 9.29: 4 to 500 million dollar loss in annual production... Its why the Grains Research and Development 14.49: Corporation has previously supported soil acidity 17.39: research in the state, and why currently the federal government 21.99: program is contributing funding to a joint state government 25.599: and private enterprise project... 252.67: Narrator: WA has a number of lime pits along the coast 256.63: and this one at Lancelin about an hour and half 259.079: drive north of Perth has one of the largest marketing footprints, supplying lime to farms 264.05: up to 600 kilometres away...
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Catalogue: Ground Cover
Wet conditions can cause headaches for growers at harvest time, but a silver lining may be the opportunity to use deep cultivation to alleviate compacted sands... Research has also shown that the use of CTF techniques on deep-ripped soils can save fuel and deliver crop yields about 10 per cent higher compared with those from cultivated areas where CTF is not used... Dr Blackwell said some growers were finding they could conserve fuel and reduce soil clod size by using deep rippers with 'shallow leading tynes' at the front of the machine and deeper tynes at the back, when they needed to rip to 500 millimetres...
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Catalogue: GRDC Media
The GRDC has called for tenders for a five-year soil acidity project in the two regions... " WA surveys in 2012 by the Department of Agriculture and Food (DAFWA), Liebe Group and Farmanco indicate that current lime application falls well below that needed to maintain soil pH levels at the critical minimum levels of 5.5 in the soil surface (0-10cm) or 4.8 in the sub-surface (10-30cm)," he said... Mr Roberts said the soil acidity investment, outlined in the GRDC 2013-14 Investment Plan , aimed to increase grower and adviser confidence in diagnosing acidity limitations to crop growth, as well as increasing lime use...
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Catalogue: GRDC Final Reports
The cost of soil acidity to agriculture is recognised as being great, especially in Western Australia where the most recent analysis estimates 30% of dryland agricultural soils have subsurface acidity - or are at high risk of developing subsurface acidity - which causes a decline in wheat yield of between 20 and 40% (GRDC Project UWA00081)... The most recent analysis estimates that 30% or 5-6 million hectares of dryland agricultural soils have subsurface acidity or are at high risk of developing subsurface acidity which causes a decline in wheat yield of between 20 and 40% (GRDC Project UWA00081)... The experience and machinery developed as a result of this work is currently being passed on and used by the SIP08 project UWA00081 and will be used where applicable by Wal Anderson's new GRDC project 'Enhancing paddock profitability - a collaborative diagnostic approach to cropping systems research'...
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Catalogue: GRDC Media
Subsurface acidity is a major constraint to crop and pasture productivity across Western Australia's grainbelt and is estimated to erode potential crop yields by 9 to 12 per cent, worth $500 million annually... About 14.25 million hectares of WA grainbelt soils are acidic or at risk of becoming acidic to the point of restricting crop yields, and lime use has increased in recent years to address acidic soils with low pH levels... Useful information for grain growers about subsurface acidity and liming is available in a Grains Research and Development Corporation (GRDC) Soil Acidity in WA Hot Topic, available at www.grdc.com.au/SoilAcidityWA ...
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Catalogue: Ground Cover
DAFWA estimates more than 70 per cent of surface soils and half of subsoils across the WA wheatbelt - about 14 million hectares - are affected by soil acidity that can reduce wheat yields by up to 13 per cent... Part of the project involves extensive glasshouse trials at UWA to evaluate the effectiveness of alternative lime products, such as finer granulated limes, liquid limes and calcium nitrate as a fertiliser, based on grower interest... "We aim to establish a further three trial sites this year and by 2018 there will be six sites set up as part of this project," Mr Gazey says...
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Catalogue: Ground Cover
DAFWA estimates more than 70 per cent of surface soils and half of subsoils across the WA wheatbelt - about 14 million hectares - are affected by soil acidity that can reduce wheat yields by up to 13 per cent... Part of the project involves extensive glasshouse trials at UWA to evaluate the effectiveness of alternative lime products, such as finer granulated limes, liquid limes and calcium nitrate as a fertiliser, based on grower interest... "We aim to establish a further three trial sites this year and by 2018 there will be six sites set up as part of this project," Mr Gazey says...
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