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soil nitrate

Catalogue: GRDC Updates
Field trials on northwest NSW cracking clay soils (Vertosols) during 2011-2013 showed that surface application of urea led to ammonia volatilisation averaging 11% N loss when applied to fallow soils, and 5% N loss when applied to tillering wheat crops... Compared to urea, losses from ammonium sulfate were less, except when the soil contained >2% calcium carbonate (lime)... At the conclusion of the month, we sampled soils and plants (at in-crop and pasture sites) and measured soil nitrate and ammonium and plant total N. We did not measure N uptake into grain...
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Catalogue: GRDC Updates (North)
NITROGEN - CATCHING MORE DOLLARS PER UNIT.. Gulargambone Grains Research Update 15 thFebruary, 2006 domestic stock feed industry will see that country emerge over the next two or three years as a significant importer... Gulargambone Grains Research Update 15 thFebruary, 2006 taken in strips that are not limited for nitrogen which are then compared against the rest of the paddock which has been grown under a lower nitrogen environment...
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Catalogue: GRDC Media
Saturating winter rain across parts of southern and central NSW have left some crops waterlogged and growers questioning how to approach nitrogen (N) management over the coming weeks... The challenge facing growers is to determine whether N should be applied to water-affected crops and if so, how much and when... Incitec Pivot Limited (IPL) technical agronomist Jim Laycock said N applications should only be considered in paddocks where water is laying when that water is receding and soil has begun to dry out...
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Catalogue: GRDC Updates
Maximising the nitrogen (N) benefits of rhizobial inoculation.. Inoculation of legumes with rhizobia can deliver substantial N inputs to southern farming systems even when the impact on legume yield is small... Inoculation of legumes with rhizobia is a standard practice...
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Catalogue: Ground Cover
Trials have shown significant denitrification in summer after post-harvest mineralisation of crop residues such as chickpea crops and canola... In 'normal' dry years, losing soil nitrate through denitrification is a relatively small problem - a bigger issue now is the slowly declining soil nitrogen reserves across the region, especially after multiple above-average yields... Wet summers increase the potential to lose nitrogen through the natural process of denitrification, so the potential for losses is higher under those conditions...
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Catalogue: GRDC Media
Understand the factors that affect mineralisation.. The rate of mineralisation varies with soil temperature, water content and, depending on the soil type, it can vary with the amount of organic matter and residues, and pH - mineralisation is slower in acidic soils... During the growing season, the amount of mineralisation is reasonably predictable and models are available that will estimate mineralisation over time periods ranging from days to years...
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Catalogue: GRDC Media
Understand the factors that affect mineralisation.. The rate of mineralisation varies with soil temperature, water content and, depending on the soil type, it can vary with the amount of organic matter and residues, and pH - mineralisation is slower in acidic soils... During the growing season, the amount of mineralisation is reasonably predictable and models are available that will estimate mineralisation over time periods ranging from days to years...
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Catalogue: GRDC Final Reports
Each year, growers in the northern grains belt make decisions about the amount of fertiliser nitrogen (N) they are going to apply to approximately four million hectares of paddock, with the vast majority of decisions made without the benefit of soil testing... From the validation work that has been done, it is clear that 'NBudget' can assist growers and advisers to fine tune N management decisions provided they have adequate records from the previous season, i.e. prior grain yields and proteins and fertiliser N inputs for the particular paddock... The 'NBudget' algorithms are also incorporated into CropChooser on the original CropMate website, thereby providing potential users with a tool to compare the economics of various cropping options (i.e. gross margin analyses) in which N and biological effects have been valued and the value attached to the crop, rather than the cost of production of the following crop...
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Catalogue: GRDC Research Summaries
An improvement in the efficiency of soil nitrogen cycling is expected to reduce nitrous oxide emissions... Existing farmer networks (Southern Farming Systems - Hamilton Branch, Horsham East Top Crop Group and the Birchip Cropping Group) will be used to help develop the key messages, so that they clearly demonstrate their relevance and importance to commercial cropping farms... Key extension messages at field days and fact sheets will focus on efficient nitrogen use by utilising existing tools (ie Yield Prophet, deep soil testing) for more informed nitrogen fertiliser decision making...
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Catalogue: GRDC Final Reports
The treatments included harvesting the stubble for straw, standing vs. flattened stubble, and early or late control of summer weeds... Further testing would be beneficial... We encourage measurements of soil water status as these integrate the effects of all these factors...
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