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crop uptake

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Catalogue: GRDC 2014 Research Summaries
" Managing soil microorganisms to unlock the P bank in soil: Taking back what.. Much of the remaining fertiliser P becomes fixed in soil and the P 'bank' in Australian arable soils is estimated to be worth $10 billion, or 100 kg P/ha of arable land (Cornish 2009)... The Australian grains industry needs new strategies to increase plant access to fixed P in soil that don "t compromise productivity, income or soil fertility  Let "s take back what "s ours!This project will identify practical agronomic strategies allowing grain growers to pro-actively manage microbial release of fixed P and P uptake by grain crops...
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Catalogue: GRDC Updates (North)
Oil composition can be compromised and lead to a change in fatty acid profiles if the seed is harvested when too moist, the seed has been excessively thrashed, admixture / moisture and disease levels are too high or the temperatures in your silo reach 35 C plus for more than 3 or 4 days in a row... People in some areas have very low levels of awareness that salinity is a problem, and report a low level of salinity... The chemical fertility of soil is only one group of factors that need to be considered when producing a good crop and a good income...
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Catalogue: GRDC Updates (South)
Oil composition can be compromised and lead to a change in fatty acid profiles if the seed is harvested when too moist, the seed has been excessively thrashed, admixture / moisture and disease levels are too high or the temperatures in your silo reach 35 C plus for more than 3 or 4 days in a row... People in some areas have very low levels of awareness that salinity is a problem, and report a low level of salinity... The chemical fertility of soil is only one group of factors that need to be considered when producing a good crop and a good income...
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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture and Food, Western Australia... Overall, the production and supply of fertiliser accounted for a large proportion (35%) of the GHG produced from wheat production, and occurred in the pre-farm stage (Table 1)... Overall, constraints have a far smaller effect on heavy soils than on sand plain soils...
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Catalogue: GRDC Updates (North)
Precision row placement is likely to have its greatest impact on reducing CR and CRR levels in a no-till farming system with the adoption of GPS guided controlled traffic likely to further benefit this approach... Its main impact on crop productivity has been shown to occur through the disruption of the plants ability to use water efficiently to produce grain (Figure 6)... Plant early in areas of low frost risk, such as higher slopes, and reduce the risk of frost damage by planting more than one variety and by varying planting times...
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Catalogue: GRDC Updates (South)
Precision row placement is likely to have its greatest impact on reducing CR and CRR levels in a no-till farming system with the adoption of GPS guided controlled traffic likely to further benefit this approach... Its main impact on crop productivity has been shown to occur through the disruption of the plants ability to use water efficiently to produce grain (Figure 6)... Plant early in areas of low frost risk, such as higher slopes, and reduce the risk of frost damage by planting more than one variety and by varying planting times...
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Catalogue: GRDC Factsheets
KEY poiNtS A range of soil test values used to determine if a nutrient is deficient or adequate is termed a critical range... recent research has highlighted that nitrogen applications can be wasted, even on cropping soils that have low n availability, if the levels of other nutrients such as potassium (K), phosphorus (P) and sulfur (S) are not adequate... The critical wheat soil S test value measured in the 0 to 30cm soil layer is 4.6 (4 to 5.3) mgS/kg for all soils to achieve 90 per_cent of maximum yield...
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Catalogue: GRDC Factsheets
KEY poiNtS A range of soil test values used to determine if a nutrient is deficient or adequate is termed a critical range... recent research has highlighted that nitrogen applications can be wasted, even on cropping soils that have low n availability, if the levels of other nutrients such as potassium (K), phosphorus (P) and sulfur (S) are not adequate... The critical wheat soil S test value measured in the 0 to 30cm soil layer is 4.6 (4 to 5.3) mgS/kg for all soils to achieve 90 per_cent of maximum yield...
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Catalogue: GRDC Updates
Plot of cumulative crop P uptake against Colwell-P for 15 soils used in the glasshouse depletion experiment... Plot of relative yield against Colwell-P for 15 soils used in the glasshouse depletion experiment... The results in Fig. 2 indicate that the BSES-P (440 mg P/kg) in Soil 9 is not as available as the BSES-P in Soil 8 or Soil 3 (382 mg P/kg and 91 mg P/kg respectively)...
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Catalogue: GRDC Updates
New ways to estimate crop needs and deliver P to improve the return on fertiliser investment.. The implications of this from a productivity perspective are unclear, but early results are suggesting that some significant yield gains may be possible on these soils... While the results suggest that once soils have become depleted in subsoil P significant yield gains can be achieved by improving soil P status, there are a large number of practical issues that need to be resolved...
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