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heavier soil

Catalogue: GRDC Updates
If we may accept that S removal in grain is lower than commonly accepted... S requirements of the trial yields could have been satisfied even considering an arbitrary figure of only 50% efficiency, except the Nyngan site... The figure of 50% above has no sound basis the author is aware of...
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Catalogue: GRDC Updates (West)
The relative effectiveness was calculated at the effectiveness of N at a depth compared with the effectiveness of N in the top-soil (0-0.2 m layer)... (A assuming Bulk density of 1.5), B % of sites measured to that depth not of the 474 cores).. The trials necessarily included whatever deep soil N the crops could access and so the responses will be weighted by that contribution from deep N. For tools such as Yield Prophet , the N at depth is usually measured and included in the model the roots for most of the soils in Yield Prophet are set to unconstrained growth...
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Catalogue: GRDC YouTube channel
Summer rainfall in excess of 25-30 mm in a single event is usually stored in the subsoil, so a rainfall event of 100 mm would leave about 70 mm in the soil... Rainfall events smaller than 25 mm are generally completely evaporated prior to sowing... Residue management has little impact on stored soil water at sowing...
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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: GRDC Updates
Previous trials and demonstrations funded through the Department of Environment Water and Natural Resources (DEWNR) and Caring for Our Country have shown large increases in production are possible results have been variable and somewhat unpredictable. '.. The document provides a summary of areas of potential opportunity and also a brief description of the most likely and most beneficial outcomes... While a review of claying trials in South Australia showed an average yield increase of 70 per cent, individual results ranged from 0 to 100 per cent...
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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 Updates
The objective of the paper is to examine the relative contribution of soil biological attributes, including organic carbon to crop production using Western Australian (WA) farming systems as an example... Identifying Soil Constraints to Crop Production Environmental indicators are measures of physical, chemical, biological or socio-economic characteristics which reflect changes in processes, properties or function - with different attributes required for different land uses... In the trial, the microbial biomass (measured to 30 cm depth) contained the equivalent of 192 kg/ha urea (stubble retained) and 146 kg/ha urea (stubble burnt) - a significant source of potentially plant available N. These results illustrate that regular inputs of organic residues promote both a larger but also more active microbial community...
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Catalogue: Ground Cover
Drying climate turns research spotlight onto heavy soils.. While a drying climate and poor crop yields have caused some growers to consign the worst of the soil type to the too-hard basket, preliminary success with a mulching trial aimed at conserving soil moisture has spurred Ian and members of his local grower group to investigate whether Morrell soil can be better managed... Ian says in a good year (200mm growing-season rainfall) Morrell soil can be profitable because its good fertility makes it cheaper to crop and manage than the sandier, acidic soils in the region. "..
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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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