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Novel nitrogen fertiliser
will reduce emissions
13th July 2008
Research showing that each application of nitrogen fertiliser adds to greenhouse emissions has led to development of a fertiliser that reduces losses to the air.
While releasing less of the greenhouse gas nitrous oxide, the new product, called Guardian, also means more nitrogen stays in the soil longer for use by crops.
Agriculturalist, Philip Toy, found the key in his understanding that bacteria reduce nitrate to the bi-products nitrogen gas and nitrous oxide, which are both readily diffused into the atmosphere. By using inhibitors which delay the natural course of the nitrogen cycle, valuable time is bought for the crop and the environment.
“Basic urea rapidly undergoes hydrolysis when in the presence of moisture and the enzyme urease,” he said. “A urease inhibitor that has been incorporated in the make-up of Guardian, however, neutralises the urease enzymes for up to two weeks minimising volatisation and loss above ground, allowing valuable time for rainfall or irrigation to work nitrogen into the soil where it can be absorbed by the roots of plants.”
Guardian also has a powerful nitrification inhibitor which makes Guardian a slow release nitrogen, working over 12 weeks from application. This powerful inhibitor also is very effective in reducing Nitrous Oxide.
The principal greenhouse gases are carbon dioxide, methane, and nitrous oxide. Methane and Nitrous Oxide have higher warming potentials than Carbon dioxide.
It has been stated that one molecule of nitrous oxide is equivalent to 310 molecules of carbon dioxide
The development is a response to calls to cut greenhouse emissions, for which agriculture contributes nearly 20% in the form of nitrous oxide from soils, methane from ruminants and carbon dioxide from fuel and stubble burning.
“Farmers are innovative and keen to do their bit,” Phil Toy said. “They have already made inroads through stubble retention and minimum tillage and I believe Guardian will have a place in their cropping and production programs.”
Philip Toy
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