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Catalogue: Ground Cover
To manage the issues, Andrew and Gina Kenny and Andrew's parents Mike and Sara are using a range of short-term mitigation and longer-term amelioration strategies... Andrew says clay incorporation is the most effective amelioration remedy, producing significant crop yield increases where it has been used on about 300ha... "The paired-row seeder effectively has 50 per cent more seeding row, which increases the chances of seed landing in wet soil, and the wings means it potentially grades the water-repellent soil out of the wider furrow better," Andrew says...
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Catalogue: Ground Cover
While neighbours in WA"s Kellerberrin district began to adopt the slightly less radical "no-till", using knife points, Kit soldiered on, fine-tuning his disc-based system... In his search for answers he began to reconsider the use of discs, and also the continuing presence of sheep and pasture, which he is reluctant to relinquish... Kit"s position illustrates a common dilemma among many wheatbelt farmers who are reluctant to rely solely on crops and abandon sheep...
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Catalogue: GRDC Updates
Soil mixing such as rotary spading often proves an excellent clay incorporation method and offers opportunities for simultaneous incorporation of soil improvers such as lime or gypsum... The paired row seeding boots gave the highest yield response over knife points with nearly a 1t yield increase on the pale deep sand and a 650 kg/ha yield increase on the sandy gravel... Using rounded or 'V'-shaped press-wheels can minimise the risk of furrow collapse and infill and also prevent the furrow side walls being ripped up, which can occur with more rectangular shaped press-wheels creating a tumbling mass of soil behind the press wheel and poor product placement...
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Catalogue: GRDC Updates (West)
KNIFE POINTS KNIFE POINTS.. Fine repellent dry soil 'boils' up in front of the almost vertical point face and runs behind the point into the seed slot.. The small wings behind the point push up the soil beside the point and increase the slope...
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Catalogue: GRDC Updates
Developing and assessing agronomic strategies for water repellent soils davies table 1.. It should be noted that the yield responses measured with paired cuts on water repellent areas were quite large compared to the average grain yield advantage for the winged point-paired row system across the whole paddock (200 kg/ha)... Recent research has shown that a topsoil clay content of 3% is sufficient to overcome topsoil water repellence where the organic carbon content is 1% but higher clay contents of 5-7% are required where the organic carbon content is higher at 1.5% (DAFWA Bulletin 4773, 2009)...
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Catalogue: GRDC Media
Furrow sowing often worsens water repellence.. New research findings confirm grower observations that Western Australia's most common seeding technique - furrow sowing using knife points and press wheels - often exacerbates water repellence on sandplain soils... "But recent evidence shows this technique can in some circumstances actually cause water repellent soil to become concentrated with the seed and fertiliser in the base of the furrow," he said "This may be a result of the flow of dry, water repellent soil around the knife point and into the slot ahead of the closer plate and press wheel...
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