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available soil nitrogen

Catalogue: GRDC Media
Central Queensland wheat growers have seen low protein levels in this season's crop with the likely causes stemming from the long wet season of 2010-11... These include: low starting soil nitrogen as a consequence of low organic carbon (less mineralised nitrogen) and denitrification; applied bag nitrogen still being close to the surface and not located in moisture where the wheat plant roots could easily access it; crops growing poorly and unable to exploit all the available soil nitrogen; leaching; and soil erosion losses... Log in or register to leave a comment...
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Catalogue: Ground Cover
Studies are continuing to show that grain growers can get much more from their fertiliser budgets by checking their soils' phosphorus levels before sowing and more directly targeting inputs to crops that are clearly nutrient-limited... Mr Speirs, of MS&A, says at an Australian Premium White (APW) wheat price of $280 a tonne for a cost of $6 per unit of phosphorus, the return is 4:1 or 400 per cent... According to Mr Speirs, profitable nutrient management starts with knowing how many kilograms of grain will buy one kilogram of phosphorus...
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Catalogue: GRDC Updates
Have a well thought out plan in regard to nitrogen application and amend it as the season unfolds... With the ability to measure starting soil moisture and nitrogen levels and a variety of ways in which we can apply nitrogen to a crop, planning for nitrogen input can start before a seed has hit the ground... A crop should be assessed for disease or other nutrient deficiencies prior to spreading additional nitrogen...
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Catalogue: GRDC Updates
Using Crop Sensors In the US, Europe and Australia there is increasing interest in using crop sensors mounted on farm machinery (boom mounted) to monitor crop canopy performance... Influence of nitrogen timing and rate on yield t/ha - Lubeck cv Annuello 2007 NDVI correlation with Green Area Index (GAI) There are, as outlined below, a number of issues that would need to be clarified before NDVI readings could be used to calculate nitrogen inputs for cereal crops... Strength of correlation between growth stage and NDVI readings recorded with the Greenseeker assessed at the Inverleigh SFS trial site, Southern Victoria in 2007 - cv Mackellar...
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Catalogue: Ground Cover
CliMate displays data such as stored soil water and nitrogen... CliMate estimates stored soil moisture based on individual paddock data, such as the length of the fallow period, the amount of soil organic matter, stubble load, soil type and rainfall received during the fallow period... Research undertaken over several years by NSW DPI staff such as Col McMaster and Barry Haskins (now a private researcher/consultant) noted that delayed or missed fallow weed control opportunities quickly led to loss of stored soil moisture, as well as loss of more than 40kg/ha of available soil nitrogen...
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Catalogue: Ground Cover
CliMate displays data such as stored soil water and nitrogen... CliMate estimates stored soil moisture based on individual paddock data, such as the length of the fallow period, the amount of soil organic matter, stubble load, soil type and rainfall received during the fallow period... Research undertaken over several years by NSW DPI staff such as Col McMaster and Barry Haskins (now a private researcher/consultant) noted that delayed or missed fallow weed control opportunities quickly led to loss of stored soil moisture, as well as loss of more than 40kg/ha of available soil nitrogen...
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