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non wetting soils

Catalogue: GRDC Media
A new booklet is available outlining options that Western Australian farmers have adopted to deal with non-wetting soils, and advice on developing strategies to manage these soils... Many of the farmers visited during recent 'non-wetting bus tours' are featured in a new GRDC RCSN booklet Combatting non-wetting soils ... Mr Roberts said that along with frost and weeds, non-wetting soils had been identified by the western regional panel and Regional Cropping Solutions Networks (RCSNs) as one of the top three GRDC research, development and extension (RD&E) priorities in WA...
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Catalogue: Ground Cover
Clay and spading helps rebuild non-wetting soils.. On 19 July 2010, after about 78mm of rain, the nil treatment (Figure 1) had a lower plant density and went on to yield 0.66t/ha, while the 260t/ha of clay incorporated by spading plot (Figure 2) had a high plant density and went on to yield 1.41t/ha... In 2010 Trevor had electromagnetic surveys (EM38), gamma-ray spectrometry (radiometrics) and deep soil analysis done for measuring and mapping the depth to clay and he used these maps in 2011 to strictly apply clay only where it was needed...
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Catalogue: Ground Cover
He estimates 90 per cent of the 2400 hectares he uses for cropping on his farm does not wet-up on the surface (0 to 10-centimetre layer) during the growing season unless there is a major rain event... Benefits of claying "On the treated areas, we have probably doubled our crop yields in favourable seasons - although seasonal variation makes it hard to gauge what the actual gains have been," Clint says... Clint says a major benefit of claying is that weeds germinate in a tighter period in the first year, allowing an effective first knockdown herbicide application...
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Catalogue: Ground Cover
Mouldboard plough outperformed spader for weed suppression.. When the weed population was checked in March 2010 after a wet summer, Andrew says the results showed mouldboard ploughing had outperformed spading... The paddocks nominated for mouldboard ploughing are scheduled for the end of the sowing program, the delay allowing time for the opening rains to have thoroughly wet the soil down to 300mm...
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Catalogue: GRDC Updates
The aim of the study was to determine how mouldboard ploughing (soil inversion), rotary spading and banded wetting agent affect the availability of soil nutrients... Soil moisture and pH were measured on a 5 x 5 cm grid and root maps were taken by marking each root intersection with the pit face on a transparent film... Our results from the first year of the study show that the method used to manage soil water repellence had little impact on soil nutrient supply with the exception of phosphorus...
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Catalogue: GRDC Research Summaries
The project will link and integrate with another project on non-wetting soils 'Delivering agronomic strategies for water repellent soils in Western Australia' led by Dr Stephen Davies at DAFWA... The main focus of this project "Novel solutions for managing non-wetting soils", is to explore managements that promote water infiltration into non-wetting soils and increase crop production and profitability... At the beginning of the project a review will be done of current knowledge on strategies to manage non-wetting soils, including published research reports, grower knowledge and unpublished DAFWA reports...
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Catalogue: GRDC Media
Western Australian grain growers on fact finding bus tours to view systems used by their peers to alleviate non-wetting soils learned that there is no 'single bullet' answer to the soil constraint... "The tours looked at a range of methods that farmers are using to help manage non-wetting soils, which have been identified by the GRDC RCSNs as heavily affecting the profitability and productivity of most WA growers," she said... Non-wetting researchers Margaret Roper, of CSIRO, and Stephen Davies, of DAFWA, said the tours demonstrated that non-wetting soils could be successfully ameliorated by many, often completely different options, ranging from minimum soil disturbance to mouldboard ploughing...
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Catalogue: GRDC Media
Polymers probed in novel non-wetting research.. Image of non-wetting soils in WA. Photo taken by Stephen Davies, DAFWA.. "We're aiming to get a better understanding of how chemical surfactants interact with organic molecules and the soil, and how we can improve these products so water can be absorbed quickly by the soil," he said...
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Catalogue: Ground Cover
Mouldboard ploughing could help lift yields in sandy soils.. Trials in WA show mechanical soil inversion could reduce soil constraints and herbicide-resistant weeds in sandy soils By Nicole Baxter Key points Researchers say inverting sandplain soils using a mouldboard plough or rotary spader once every 10 to 15 years could help manage 'hostile' subsoils, non-wetting sands and herbicide-resistant weeds... Dr Davies says deep-ripping to remove compaction resulted in similar increases in productivity, but the added benefits of mouldboard ploughing include improved weed control, reduced soil water repellence and an opportunity to increase soil pH through lime incorporation...
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Catalogue: GRDC Media
Select a seeding system for your soil.. "When selecting for a higher SBU system, there are many factors to consider including single or double shoot, distinct split-rows or a wide band sowing, integrated opener design or wing attachment for an existing opener, and fertiliser placement relative to the seed zone," Dr Desbiolles said... "The best treatment, reaching over 90 percent emergence, in the Moorlands trial was obtained by adding a shallow operating scooping share ahead of a triple disc seeding system to clear away the top 3-4cm of soil into the inter-row zone and assist with placing seeds into moist soil," Dr Desbiolles said...
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