Soil and Nutrition, 22 Feb 2023
Anecdotal evidence suggests that the practice of applying sulfate of ammonia in close succession to surface lime is a risk for ammonia volatilisation. The practice is common enough in Western Australia to raise concerns and research is underway to quantify the risks.
Soil and Nutrition, 21 Feb 2023
Denitrification and volatilisation are the two main gaseous loss pathways for nitrogen from cropping systems, but there are still many gaps in our understanding of the mechanisms and importance of these losses across Australian grain growing regions.
Soil and Nutrition, 20 Feb 2023
Growers spend around $1.1 billion on nitrogen fertiliser each year, yet 25 to 70 per cent of applied nitrogen can be lost from the system. A national investment aims to plug the gaps in our understanding of nitrogen loss pathways in Australian cropping systems.
Soil and Nutrition, 19 Feb 2023
Nitrogen fertiliser is the largest source of greenhouse gas emissions in the grains industry. Analysis has found that by improving nitrogen use efficiency, growers stand to increase yields and generate a 10 per cent reduction in the intensity of emissions – including emissions associated with fertiliser manufacture.
Soil and Nutrition, 18 Feb 2023
Commonly used rules of thumb, which advisers and growers use to make fertiliser decisions, are based on a nitrogen fertiliser uptake of around 50 per cent of that applied, but Victorian research undertaken in growers’ paddocks puts that figure at just 35 per cent.
Soil and Nutrition, 17 Feb 2023
Soil organic matter, which is critical for healthy soils and sustainable agricultural production, is declining under continuous cropping. This means more fertiliser, especially nitrogen, and the best management practices are needed to protect soils and maintain grain production levels.
Soil and Nutrition, 14 Feb 2023
The sufficiency approach means that nitrogen mined from soil organic matter is not replenished, causing a long-term decline in the soil nitrogen bank. Once organic matter is lost, it takes a long time to rebuild. However, there are three ways that growers can potentially improve soil organic matter and fertility.
Soil and Nutrition, 12 Feb 2023
Nitrogen banking may provide a suitable long-term approach to calculating nitrogen requirements for cereal and canola crops. The banking approach is simpler and less time-consuming than seasonal risk-based approaches.
Soil and Nutrition, 11 Feb 2023
The burden of choice can rest heavily when making nitrogen fertiliser decisions, and the yield potential of many crops remains limited by nitrogen. GRDC is committed to improving nitrogen use efficiency to help growers improve production and profitability and reduce greenhouse emission intensity.
Soil and Nutrition, 18 Jan 2023
A living legacy of soil quality information has been created under the stewardship of SoilsWest by a broad collective of soil scientists, complemented with grower experiences in a series of multimedia ebooks. They support better resource use, minimising inputs and cost and increasing the productivity and resilience of our soil resource and will be added to as new research comes on stream.