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Catalogue: GRDC Updates (West)
KEYMESSAGES During the crop growing season, there was little difference in soil water under annual crop, perennial pasture, and pasture-cropped plots... In the paper, we concentrate on plots in which neutron moisture meter access tubes were installed... Deep drainage beyond a depth of 3.0 m was calculated from rainfall (measured on-site with a tipping-bucket rain gauge), ET 0(Allen et al. 1998) and change in soil moisture storage...
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Catalogue: Ground Cover
Figure 1. pH indicator highlighting alkaline subsoil, Cadoux, WA, August 2005.. The workshops demonstrated to the growers how knowing the depth of their soil profile, the depth to which crop roots can grow and the presence of barriers to root growth was vital to their understanding of how to manage crops and inputs ... By combining the knowledge gained from soil pits, the information in the soils database and our current knowledge of subsoil constraints, the research team has been able to map and determine the extent of the major subsoil constraints for WA (see Figure 2)...
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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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Catalogue: GRDC Publications
Increasing organic matter (and organic carbon) in soil requires a balance of carbon and nitrogen as well as other nutrients... 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 Updates
We first determined (1) the amount of P applied as fertilisers to crops in WA and (2) the amount of P removed in harvested grains by multiplying grain yield by the P content of the grains... For example, if we removed 5 kg P/ha in the form of P contained in grains and we applied 10 kg P/ha as fertiliser, then the P balance efficiency is 5/10x100 = 50 %. P balance efficiency allows us to assess along with soil test P data if we are building-up, maintaining or depleting soil P... We estimate that about 87% of the wheat paddock soil samples examined are no longer P deficient (exceed their critical values)...
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Catalogue: Broadacre Field Crops DAFF QLD
While chickpeas are considered to have moderately high requirement for P, economic fertiliser responses to P are uncommon... The two exceptions are: soils with critically low P levels (below 6-8 mg P/kg, based on a Colwell test at 0-10cm) and no prior history of P fertiliser long fallow situations with low VAM levels (10 months or longer) even where soil levels are considered adequate... Some situations where N fertiliser may warrant consideration include: late plant situations where the crop can flower as quickly as 60 days, and rapid early growth is critical in achieving adequate height and sufficient biomass to support a reasonable grain yield...
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Catalogue: Broadacre Field Crops DAFF QLD
While chickpeas are considered to have moderately high requirement for P, economic fertiliser responses to P are uncommon... The two exceptions are: soils with critically low P levels (below 6-8 mg P/kg, based on a Colwell test at 0-10cm) and no prior history of P fertiliser long fallow situations with low VAM levels (10 months or longer) even where soil levels are considered adequate... Some situations where N fertiliser may warrant consideration include: late plant situations where the crop can flower as quickly as 60 days, and rapid early growth is critical in achieving adequate height and sufficient biomass to support a reasonable grain yield...
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Catalogue: Broadacre Field Crops DAFF QLD
While chickpeas are considered to have moderately high requirement for P, economic fertiliser responses to P are uncommon... The two exceptions are: soils with critically low P levels (below 6-8 mg P/kg, based on a Colwell test at 0-10cm) and no prior history of P fertiliser long fallow situations with low VAM levels (10 months or longer) even where soil levels are considered adequate... Some situations where N fertiliser may warrant consideration include: late plant situations where the crop can flower as quickly as 60 days, and rapid early growth is critical in achieving adequate height and sufficient biomass to support a reasonable grain yield...
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Catalogue: Nuffield Scholar Reports
The report proposes the idea that saline water, defined as having an electrical conductivity greater than 1.5 deciSiemens per metre (dS/m) (960 parts per million), has a part to play in filling the void of future losses of surface water... The aim of the report is to investigate if saline water can be successfully used without desalination, and what practices are required to reduce the effects of it on the crops and catchments they are applied to... Drip irrigation systems were by far the most common irrigation system using saline water...
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