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soil fertility

Catalogue: GRDC Updates
Sandy, acid soils in high rainfall areas are most prone to potassium deficiency, particularly if cut for hay... Regional nutrient budgets show a progressive drawdown of potassium (K) as it is removed in plant products and, depending on cropping system and soils, there may be a need to consider the role of K. Use of K in Australia declined from 183 kt K in 2003 to 149 kt K in 2011 but did recover somewhat in 2012... Around ten times more K will be removed in hay than grain...
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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... for Crop growth The critical value indicates if nutrient supply Crop growth not limited by nitrogen and sulfur, which are highly mobile is likely to result in a crop yield response limited by deficiency deficiency in the soil, 0 to 60cm is recommended... KCl-40 S soil tests taken from deeper sampling provide a more reliable prediction of S response in canola...
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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... for Crop growth The critical value indicates if nutrient supply Crop growth not limited by nitrogen and sulfur, which are highly mobile is likely to result in a crop yield response limited by deficiency deficiency in the soil, 0 to 60cm is recommended... KCl-40 S soil tests taken from deeper sampling provide a more reliable prediction of S response in canola...
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Catalogue: GRDC Updates
Figure 1: Effects of (a) application of an additional 40-60 kg P/ha to soils prior to planting, relative to normal starter P applications alone; and (b) placing that additional P deeper in the soil profile (15-20cm), compared to surface (5-7cm) bands... half of the soil P removed by cropping comes from below the top 10cm and about 90% of that removed P comes from forms/pools of P not measured in the Colwell (bicarbonate P) soil test; and (ii) when luxury rates of P are applied annually , >95% of the residual P stays in the top 10cm of the profile and the depletion of the subsoils continued unchanged... , we used a bioassay to assess how much of the P in the various pools was actually available for plant uptake, and how well this correlated with what the Colwell test predicted...
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Catalogue: GRDC Updates
Managing nutrition on soils that have been treated for water repellence by cultivation.. A comparison of N uptake at 10 N and 50 N weeks after sowing showed significant increases in N uptake in the nil and banded wetter though not in mouldboard and spading... The results suggest that soil nitrogen is more available in the mouldboard and spading treatments than in the nil and banded wetter...
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Catalogue: Nuffield Scholar Reports
This species of grass was most commonly used in an intensive grazing dairy system where it would run 40 head of cattle on 0.6 ha for three days with a rest period of 28-32 days (Moreira, 2012)... Recent reports would suggest that psyllid damage is sometimes reduced and stocking rates have in places returned to normal... As shown below FTAI has the ability to increase the percentage of cows in calf...
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Catalogue: GRDC Updates
Crop Use of Fertiliser, Topsoil and Subsoil P We had 7 experiments in the field under rain-out shelters where we directly measured the uptake of P fertiliser (using radioisotope) under wet (decile 7-8) and dry (decile 2-3) in-season conditions... We applied P fertiliser containing a radioactive tracer that gives the fertiliser a unique 'fingerprint' so that we could track the uptake of fertiliser into the plant... We are examining the value of information that might support decision making around P management including the value of accurate soil P testing and the value of being able to estimate when soil P fertility will fall below sufficiency using modelling techniques...
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Catalogue: GRDC Updates (North)
Trangie Grains Research Update Precision farming, controlled traffic & farming systems.. Grains Research Update - Trangie August 2002 of weathering of Australian soils, resulting in a lower soluble mineral concentration in the soil water... Other issues Given the above results from our demonstration sites and issues raised concerning direct seeding and controlled traffic in the context of conservation farming, we believe more work still needs to be conducted to enable us and the machinery / adviser industry to more adequately offer advice to farmers on machinery / farming systems options...
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Catalogue: GRDC Updates (South)
Trangie Grains Research Update Precision farming, controlled traffic & farming systems.. Grains Research Update - Trangie August 2002 of weathering of Australian soils, resulting in a lower soluble mineral concentration in the soil water... Other issues Given the above results from our demonstration sites and issues raised concerning direct seeding and controlled traffic in the context of conservation farming, we believe more work still needs to be conducted to enable us and the machinery / adviser industry to more adequately offer advice to farmers on machinery / farming systems options...
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Catalogue: GRDC Updates
Understanding and measuring soil water - GRDC Eastern Farming Systems Project.. Small particles (clays) that occupy the same soil volume as large particles (sands) have a greater surface area and are able to hold more water... As the Na+ ion concentration in the soil increases, clay particles move apart and the soil disperses...
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