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clay rate

Catalogue: GRDC Media
DAFWA researcher David Hall said a survey of 30 WA growers who had spread clay on their land found that only a quarter had tested clay pre-application... Mr Hall said there was no doubt that spreading clay or delving sub-soil clay boosted crop production, with long-term trials showing consistent yield increases of more than 30 per cent... "Testing clay sources - using any major soil testing laboratory - will provide a comprehensive analysis that includes PRI, standard nutrients, percentage of clay, boron and particle size," he said...
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Catalogue: GRDC Media
Growers need not use high rates of clay or expensive incorporation methods when claying non-wetting soils to improve yields, new Western Australian research suggests... Dr Davies said that in the latest trials, wheat yields improved by at least 0.2t/ha when growing season rainfall was at least 300mm and low rates of clay were incorporated to a shallow depth at sites including Meckering, Bolgart, Badgingarra, Binnu and Balla... Dr Davies said when moderate (150-300t/ha of clay-rich subsoil) and high rates of clay (300t/ha or more of clay-rich subsoil) were incorporated to a shallow depth, there was little additional yield advantage when compared to the lower clay rates...
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clay (2)
clay rate (2)