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soil disturbance

Catalogue: Ground Cover
"Farmers have embraced conservation agriculture because it makes good sense to protect the soil, conserve water and save time, labour and fuel," he said... Factors that detracted from the benefits of conservation agriculture in Australia included weeds, root disease and inhibitory soil organisms that could slow early crop growth and reduce yields... Dr Kirkegaard said soil disturbance could be required to incorporate these inorganic nutrients below the soil surface where they can stabilise carbon, allowing it to build up in the soil...
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Catalogue: GRDC Updates
Growers are increasingly moving towards a zero-till system using a disc seeder, which is changing some aspects of the farming system and the recommendations advisers provide to their clients... Disc seeders also allow higher levels of stubble to be retained, particularly at narrow row spacings, which has been a key driver of their adoption... It is important to plan your fertiliser strategy carefully, in many cases separating fertiliser from seed, or top dressing a portion of it in a separate operation...
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Catalogue: GRDC Publications
The benefits improve crop health and crop competitive ability against weeds and the effectiveness of pre-emergent herbicides... When used as a post-emergent product, little of the herbicide gets to the roots and the control of established weeds is often very poor... benefits arise when the weed is prevented from setting seed as there are no increases to the seedbank and, as a consequence, fewer weeds in the future...
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Catalogue: Ground Cover
Long-term trial shows the benefits of soil carbon.. Western Australian researchers and grower groups are investigating the benefits and pitfalls of a range of strategies to boost soil organic carbon (SOC) across the state's cropping areas... Dr Hoyle says the long-term trials indicate that by increasing organic matter inputs, retaining stubble, minimising soil disturbance and optimising plant productivity, the loss of SOC from cropping systems can be slowed or SOC can slowly increase (but this is likely to occur over many decades)...
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Catalogue: Ground Cover
Long-term trial shows the benefits of soil carbon.. Western Australian researchers and grower groups are investigating the benefits and pitfalls of a range of strategies to boost soil organic carbon (SOC) across the state's cropping areas... Dr Hoyle says the long-term trials indicate that by increasing organic matter inputs, retaining stubble, minimising soil disturbance and optimising plant productivity, the loss of SOC from cropping systems can be slowed or SOC can slowly increase (but this is likely to occur over many decades)...
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Catalogue: Ground Cover
Trials demonstrate manuring without the risk.. The sheer size and scale of subsoil manuring can make the technology seem out of reach to many growers, but using small-scale test strips has helped growers observe its benefits at high-rainfall sites with subsoil issues... Some sites have contributed data to the GRDC, La Trobe University and Victorian Department of Environment and Primary Industries' subsoil manuring project (see Subsoil manuring drives up HRZ profits )...
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Catalogue: GRDC Publications
Soil organic matter contributes to a range of biological, chemical and physical properties of soil and is essential for soil health... Soils rarely reach their theoretical potential for organic matter storage (see Figure 1.7)... In soils with low clay content the amount of humus and resistant soil organic matter is increasingly important to nutrient exchange because its large surface area gathers (adsorbs) cations from the soil solution, holding nutrients that would otherwise leach...
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Catalogue: GRDC Publications
Increasing organic matter (and organic carbon) in soil requires a balance of carbon and nitrogen as well as other nutrients... Soils rarely reach their theoretical potential for organic matter storage (see Figure 1.7)... In soils with low clay content the amount of humus and resistant soil organic matter is increasingly important to nutrient exchange because its large surface area gathers (adsorbs) cations from the soil solution, holding nutrients that would otherwise leach...
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Catalogue: Nuffield Scholar Reports
Investigation of Zero-Till Farming Systems (ZT) in high rainfall cropping zones (HRZ), and its impact on soil biology and nutrient cycling.. Over time the farmer can achieve an increase in yields, with a decrease in some inputs such as fertiliser and chemicals... The other problem is that when soil is cultivated respiration and oxidisation occurs and lot of valuable plant nutrients are burnt off and not be available later when the plant needs them as discussed earlier...
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Catalogue: Ground Cover
Photo of blue dye seeping into soil.. Dr Roper says the trials indicate that the yield gains zero-tillage and stubble retention provid in canola, barley and wheat result from improved water infiltration in the soil... "In our experiments, crops were seeded with discs on the previous year's inter-row, which resulted in no disturbance of remnant root systems from the previous year," Dr Roper says, adding that using this approach with knife points is also unlikely to disturb remnant root systems...
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