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Catalogue: Ground Cover
Craig Thompson bought a WEEDit precision sprayer seven years ago and says it has become a crucial tool for summer weed control... A stark drop in growing-season rainfall in WA's northern wheatbelt means growers have to get crop roots much deeper into the soil profile to access moisture.. Craig says that wheat-on-wheat, with the aid of Clearfield wheats, has simplified the system and allowed him to concentrate on the single most important element - holding on to every drop of rain that falls...
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Catalogue: GRDC Updates (North)
Until such varieties are released, northern growers and advisers need to select varieties firstly on the basis of crown rot risk and then manage for stripe rust ... There is a risk of WSMV being spread through infected seed into new areas... We have not been able to determine an economic threshold for RGB in sorghum from these trials...
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Catalogue: GRDC Updates (South)
Until such varieties are released, northern growers and advisers need to select varieties firstly on the basis of crown rot risk and then manage for stripe rust ... There is a risk of WSMV being spread through infected seed into new areas... We have not been able to determine an economic threshold for RGB in sorghum from these trials...
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Catalogue: GRDC Updates (North)
GRDC values the contributions made by its research partners during the 2004 series of Grains Research Updates.. Overall, there were 50 comparisons, 45 showing a positive yield increase with fluid and 5 with no yield difference... Overall, there were 11 comparisons, with 4 yield decreases due to fluids and 7 with no yield differences...
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Catalogue: Ground Cover
Figure 1: Mean yuield (t/ha) of 20 years (1983 - 2003) cropping comparing tillage systems.. When land has been cropped for many years with multiple cultivations per crop, research is showing that it can take at least three years before the advantages of no or reduced tillage show up in extra yield or more organic soils... Reduced tillage treatments - no-till, reduced-till (one to three passes per fallow of a chisel plough, blade plough and rod weeder) and stubble mulch (two to five passes per fallow of a chisel plough, blade plough and rod weeder) - convincingly out-yielded the conventional aggressive tillage system (involving two to five passes per fallow of a disc plough, scarifier and cultivator) by an average of 24 to 30 per cent per crop over the first 20 years...
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Catalogue: Ground Cover
The shift to direct-drill tillage systems is also concentrating the remaining potassium in surface soil that is often dry, reducing availability to plants... Current soil tests are not detecting emerging problems because they do not measure all the plant-available potassium pools in the soil, and soil samples are generally taken only from the top 10 cm of the profile... The shallow nutrients are regularly detected in the soil analyses of the standard (0-10 cm) soil sample, but are often not available for plant uptake for long periods during the growing season...
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Catalogue: GRDC 2014 Research Summaries
" Soil Acidity and pH Management for Central West Farming Districts.. Central West Farming Systems (CWFS) has identified (Acid soil action initiative, 2000) that the growing incidence, in certain districts, of low pH in the surface (0-10cm) and subsoil (10-30 cm) as a long term trend will limit crop yield in particular districts of low rainfall areas... Current and future decision support tools regarding lime application developed for irrigation and high to safer medium rainfall production regions will not produce management change in marginal medium to low rainfall districts as they fail to address the risk management focus of these lower yield expectation producers ( Mudge 2011)...
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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 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
Overall, soil CEC and SOC content was greatest in the 0.2 and 0.2-2 m fraction, indicating that size, and probably type, of SOM influenced CEC... Kaiser et al. (2003) found that soils with a high content of black carbon showed increased sorption ability compared with plant- and microbial-derived SOM... Addition of organic amendments can increase P availability to plants by decreasing the P adsorption capacity of soils...
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