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Catalogue: Ground Cover
Problem soil becomes a surprise bonus.. As the Morrell lime has a lower neutralising value than coastal limesand, the Nixons need to use it at double the rate (4t/ha) to achieve the same pH change... "We've increased yields by 600 to 700 kilograms a hectare by incorporating the lime into some paddocks and I think about half of this yield has come from the improved pH and the other half from the plough effect," Bob says...
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Catalogue: Ground Cover
The introduction of soil moisture probes is helping Tony Hamilton improve irrigation scheduling... Rainfall is unseasonal and unpredictable and has become more so in the 18 years that Tony and wife Katy have been farming west of the Newell Highway between Forbes and Condobolin in New South Wales... Last year the 1100-hectare mixed farm only received 200 millimetres of rainfall in the winter growing season, much of it in showers of two or three millimetres, and no irrigation allocation was received to augment the bore water...
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Catalogue: Ground Cover
CliMate displays data such as stored soil water and nitrogen... CliMate estimates stored soil moisture based on individual paddock data, such as the length of the fallow period, the amount of soil organic matter, stubble load, soil type and rainfall received during the fallow period... Research undertaken over several years by NSW DPI staff such as Col McMaster and Barry Haskins (now a private researcher/consultant) noted that delayed or missed fallow weed control opportunities quickly led to loss of stored soil moisture, as well as loss of more than 40kg/ha of available soil nitrogen...
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Catalogue: Ground Cover
CliMate displays data such as stored soil water and nitrogen... CliMate estimates stored soil moisture based on individual paddock data, such as the length of the fallow period, the amount of soil organic matter, stubble load, soil type and rainfall received during the fallow period... Research undertaken over several years by NSW DPI staff such as Col McMaster and Barry Haskins (now a private researcher/consultant) noted that delayed or missed fallow weed control opportunities quickly led to loss of stored soil moisture, as well as loss of more than 40kg/ha of available soil nitrogen...
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Catalogue: GRDC Publications
GRDC Grains Research Update Coonabarabran, February 2014 most sites achieved those returns within 2 crop seasons after deep P application may at least partly reflect the string of wetter seasonal conditions in recent years, although the results from Jandowae, Capella and Gindie all included dry seasons in at least one of the crops followed... Overall, the performance of the barley grain only varieties showed they are capable of producing around 6 t/ha of dry matter and still yielding between 2.7 and 3.4 t/ha of grain... Overall, the most prevalent virus was BWYV and in some locations more than 90% of symptomatic plants were infected with BWYV (Table 1)...
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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 Updates
Volatilisation is the loss of nitrogen to the atmosphere as ammonia gas (NH3) from soils or from fertiliser applied to soil surfaces... We tested all samples with a pHw>7 for their capacity to buffer changes in pH back to 7 (pHBC) as this is where the risk of nitrogen volatilisation ceases (Figure 1)... Urea coated with an organic complex showed no difference from ordinary urea in N volatilisation loss measured in these incubations...
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Catalogue: GRDC Publications
Tools are now available to better define soils in terms of their productive capacity and for the routine seasonal monitoring of the water resource as it is captured and utilised by crops (or weeds if allowed)... Underpinning the push to improve water use efficiency is the need for farmers and their advisors to have a good understanding of how soils work in relation to water capture and storage and why some soils have the ability to hold more water for crop use than others... Rooting depth should be 101..
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Catalogue: Ground Cover
Problem soil becomes a surprise bonus.. There is increasing focus on removing physical and chemical soil constraints to productivity across the Western Australian wheatbelt as growers strive for more profitable crops with less and less rainfall... "We've increased yields by 600 to 700 kilograms a hectare by incorporating the lime into some paddocks and I think about half of this yield has come from the improved pH and the other half from the plough effect," Bob says...
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Catalogue: GRDC Updates
The experiments are run over 4 years to test the water use efficiency, productivity and riskiness of: (i) a range of continuous cereal systems and the decisions around inputs, timing and agronomy; and (ii) potential break crop systems; across soils of differing potentials... Comparison with the non N-limiting yield potential estimated using the APSIM model of 5.05 t/ha in the swale, 6.06 t/ha in the mid-slope and 5.12 t/ha in the dune, suggests the actual yields are very close to potential yield in the wheat following pasture in the swale but well below for all treatments in the dune and mid-slope (Figure 3)... A build-up of fertility in the swale where fertilizer applications have been uniform across soil types in the past and the swales have under-performed in the dry years has meant that N was not limiting in this soil type and potential yield was attainable in the wheat following pasture where a disease break had been provided...
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