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soil reserve

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Catalogue: GRDC Updates
Managing for least cost rather than most profit.. In summary - For the effort of spraying the paddock twice over summer and an investment of $30/ha, a gain could be achieved in the following wheat crop of $105/ha.. P fertiliser should not be broadcast prior to seeding in 2008 because this approach is only justified in situations where soil P reserves are high and dressings are designed to maintain those reserves - in 2008 simply do not broadcast those paddocks and use the money saved on other inputs which will return better profits...
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Catalogue: GRDC Updates
I do believe that we need to develop farming systems which cycle P more efficiently... Both Zn and Cu will remain available to crops and pastures for long periods (up to 10 years for Zn and up to 40 years for Cu) following a recommended rate of application to soil... Due to the increased complexity of management in our current cropping systems and increased costs of fertilisers, there is a greater need for crop monitoring to help make informed nutritional decisions...
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Catalogue: GRDC Publications
The publication has been prepared in good faith on the basis of information available at the date of publication... Products may be identified by proprietary or trade names to help readers identify particular types of products but this is not, and is not intended to be, an endorsement or recommendation of any product or manufacturer referred to... There is huge scope in the available moisture stored in the soil provided the right approaches are taken to issues such as crop nutrition, seeding systems and crop management...
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Catalogue: GRDC Media
Dr Mike McLaughlin, a GRDC Southern Regional Panel member, says having soils tested to assess their P status could save growers significant input costs this year... Lower than normal maintenance rates of fertiliser P will in some instances be sufficient this coming season... Having soils tested to assess their P status could save growers significant input costs, says Grains Research and Development Corporation (GRDC) Southern Regional Panel member Dr Mike McLaughlin...
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Catalogue: GRDC Media
Dr Mike McLaughlin, a GRDC Southern Regional Panel member, says having soils tested to assess their P status could save growers significant input costs this year... Lower than normal maintenance rates of fertiliser P will in some instances be sufficient this coming season... Having soils tested to assess their P status could save growers significant input costs, says Grains Research and Development Corporation (GRDC) Southern Regional Panel member Dr Mike McLaughlin...
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Catalogue: GRDC Factsheets
Applying P at depth (15 to 20cm deep on 50cm bands) can improve yields over a number of cropping seasons (if other nutrients are not limiting)... Limited P is now constraining yields in parts of the northern grains region, particularly in the vertosols (black and grey cracking clays)... The test needs to be done only every four to six years, and is most important in the subsoil layers...
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Catalogue: GRDC Factsheets
Applying P at depth (15 to 20cm deep on 50cm bands) can improve yields over a number of cropping seasons (if other nutrients are not limiting)... Limited P is now constraining yields in parts of the northern grains region, particularly in the vertosols (black and grey cracking clays)... The test needs to be done only every four to six years, and is most important in the subsoil layers...
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Catalogue: GRDC Factsheets
Applying P at depth (15 to 20cm deep on 50cm bands) can improve yields over a number of cropping seasons (if other nutrients are not limiting)... Limited P is now constraining yields in parts of the northern grains region, particularly in the vertosols (black and grey cracking clays)... The test needs to be done only every four to six years, and is most important in the subsoil layers...
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Catalogue: GRDC Media
Subsoil reserves of mineral nutrients such as P have been run down over recent decades, with practices such as direct drill cropping accelerating the loss... The GRDC fact sheet recommends testing subsoil (10 to 30 centimetres) P levels, using both the Colwell-P and BSES-P tests across the farm, as the key to making an informed decision about fertiliser strategy... Soil testing provides an understanding of your fertility profile and is a vital step in making informed fertiliser decisions...
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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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