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negative yield response

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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