Abstract
Fertiliser savings after drought or failed crop are possible with phosphorus (P) where there has been an extensive P fertiliser history and Colwell P values are at or above crop critical requirements. As a guide, one third of average crop P replacement can be applied down to a base level of 3-4kg P/ha.
Savings in nitrogen (N) are likely to be less substantial than savings in P. Nitrogen savings are likely a result of higher spared N (mineral N carryover from last season), lower immobilisation due to lower crop residues and higher mineralisation rates assuming adequate late summer and early autumn rains.
To better assess spared and mineralised N, deep soil cores should be taken to 60cm and split at 30cm to determine the amount and timing of mineral N availability.
Savings in nitrogen (N) are likely to be less substantial than savings in P. Nitrogen savings are likely a result of higher spared N (mineral N carryover from last season), lower immobilisation due to lower crop residues and higher mineralisation rates assuming adequate late summer and early autumn rains.
To better assess spared and mineralised N, deep soil cores should be taken to 60cm and split at 30cm to determine the amount and timing of mineral N availability.
| Original language | English |
|---|---|
| Title of host publication | GRDC update papers |
| Place of Publication | Australia |
| Publisher | Grains Research and Development Corporation |
| Pages | 49 |
| Publication status | Published - 19 Feb 2019 |
| Event | GRDC Grains Research Update (Wagga Wagga) - Joyes Hall, Charles Sturt University, Wagga Wagga, Australia Duration: 19 Feb 2019 → 20 Feb 2019 https://grdc.com.au/events/list/2019/02/grdc-grains-research-update-wagga-wagga (Conference website) https://grdc.com.au/resources-and-publications/grdc-update-papers/tab-content/past-update-proceedings/2019/grdc-grains-research-update-wagga-wagga-2019?result_296215_result_page=2 (Proceedings link) |
Conference
| Conference | GRDC Grains Research Update (Wagga Wagga) |
|---|---|
| Abbreviated title | Boosting Profitability - Resilient Solutions |
| Country/Territory | Australia |
| City | Wagga Wagga |
| Period | 19/02/19 → 20/02/19 |
| Other | The GRDC Grains Research Update events are for agronomists, consultants, researchers and growers to see and discuss the latest in research and to network with their peers about how to apply new and relevant information to the latest farming systems. |
| Internet address |