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water storage

Catalogue: GRDC Final Reports
Experimental data are presented that show that fallow management, in particular that of weeds and residue cover, not only affects the amount of water stored or lost during the summer, but also has an effect on the loss of water past the root zone during the subsequent growing season... Model simulations capture these effects and a scenario analysis indicates that retaining residues past sowing increases the risk of deep water loss relatively rapidly... The effects of different residue management will be greater in wetter summers...
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Catalogue: GRDC Publications
Classifying soil types and measuring plant available water capacity (PAWC); use of fast processes such as EM38; identification of subsoil constraints; crop ability to access deeper soil water... Overall, the most prevalent virus was BWYV and in some locations more than 90% of symptomatic plants were infected with BWYV (Table 1)... GRDC Grains Research Update Nyngan, February 2014 used a PCR forBeet western yellows virus (BWYV),Bean leaf roll virus (BLRV), Phasey bean virus (PhBV) andSoybean dwarf virus (SbDV) to investigate host range of the virus species from a range of locations (Table 2)...
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Catalogue: GRDC Updates
Graph two is for a heavy clay Black Vertosol from Spring Ridge; results show the plant available water capacity (PAWC) is 272mm... Rooting depth should be determined through perusal of physical and chemical data and the physical observation of roots and water extraction through soil coring and/or electronic monitoring... Simulation of water storage using the >100 year climate record shows that a short fallow from wheat (assuming a dry soil profile at harvest in November of the previous year) results in a 50% chance of at least 110mm (range of 0-300mm) of water being available for an April planting at Spring Ridge and 80mm (range of 0-180mm) at Nyngan (Figure 8)...
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Catalogue: GRDC Final Reports
The project has demonstrated that summer fallow management can play an important role in regulating soil moisture storage, either to reduce the risk of deep drainage, or to benefit the crop... The lysimeter experiments showed that a 4 t/ha residue cover past sowing (early and mid June) could reduce evaporation losses by approximately 10 mm in 2005 (see Fig. A2) and 15 mm in 2006... To minimise the risk of deep drainage, residue retention should be avoided as much as possible and residue loads reduced to 1 t/ha or less, unless required for other purposes (e.g. erosion control)...
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Catalogue: GRDC Final Reports
Whilst managing the water balance of crops is one of the most critical issues in Australian dryland agriculture, there has been limited information available to farm managers that allows the productive capacity of soils to be considered when making crop management decisions... Evaluation of project activities showed that whilst growers were interested in soil water management and were prepared to use Yield Prophet as a tool for in-season crop management, they generally relied on their consultants to undertake the pre-season monitoring and input of data... Whilst the project has had a major influence in promoting the value of soil water in management, there is an on-going need for higher level training as well as the development of increased capacity in soil characterisation and monitoring through the exploration and adoption of new technologies...
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Catalogue: GRDC Updates
When left to grow, summer weeds tie up significant amounts of nitrogen... Grain yield was measured with a plot harvester and grain quality analysed (oil content and moisture)... Soil sampling in December 2010 showed that the differences in PAW measured in March between weedy and non-weedy treatments (Table 1) were still present at the clay site (Table 5), but no longer existed at the sand site due to the lower PAWC filling up during the growing season...
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