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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture and Food, Western Australia... Overall, the production and supply of fertiliser accounted for a large proportion (35%) of the GHG produced from wheat production, and occurred in the pre-farm stage (Table 1)... Overall, constraints have a far smaller effect on heavy soils than on sand plain soils...
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Catalogue: GRDC Updates (West)
The aim of the following study was to acquire a unique, long-term (> 1 year) data set of N 2O emissions from a rainfed, cropped soil in a semi arid region and to investigate the relationship between N 2O emissions and other soil and environmental parameters... Some ability to make in-season tactical decisions when to graze or continue through to harvest would be valuable... The commodity prices are an important aspect of any decision to graze a cereal crop...
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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture... I was educated by a group of farmers at Varley in 1982, to the importance of Crop Updates is a partnership between the Department of Agriculture, Western Australia and the Grains Research & Development Corporation 22.. Advisers and consultants should highlight the management options available to their clients, do sensitivity analyses which in effect, tell the client 'what happens to production, quality and profitability, if he chooses a certain management option ' and show how that changes with input levels, season, soil type, prices going up/down, etc...
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Catalogue: GRDC Factsheets
Nitrogen fertiliser losses from the soil as nitrous oxide gas can escalate following summer rain post-harvest in Western Australia... JJ In trials at Hamilton, Victoria, between 80 and 90 per cent of applied N was unaccounted for at harvest where urea was deep-banded 10 centimetres below the seed at sowing in soils that became saturated or waterlogged during the growing season... Trials examining legumes and canola in southern NSW found these crops used most of the mineral N available in the soil during the growing season and, as a consequence, N2O emissions mostly occurred following harvest during the summer fallow period when N was mineralised from crop residues...
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Catalogue: GRDC Factsheets
Nitrogen (N) is vital for crop growth up to 600 grams of N per hectare per day can be lost into the atmosphere as nitrous oxide (N2O), a greenhouse gas about 300 times more potent than carbon dioxide... Trials examining legumes and canola in southern NSW found these crops used most of the mineral N available in the soil during the growing season and, as a consequence, N2O emissions mostly occurred following harvest during the summer fallow period when N was mineralised from crop residues... Illustrating a worst-case scenario for N2O emissions, a study at Hamilton, Victoria, showed between 80 and 90 per cent of applied N was unaccounted for at harvest where urea was deep-banded 10cm below the seed at sowing in soils that became saturated or waterlogged during the growing season, and in cropping situations where there was: JJ high labile carbon content in cropping soils following cultivation of legumegrass pasture; JJ high rainfall leading to low soil oxygen and microbial oxidation of nitrate into gaseous N; and JJ high background mineral N content in the soil (resulting from mineralisation before the start of the cropping season)...
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