| Researcher(s) |
Peter Baines (P Baines Agronomy) Jason Collier (Rand Fertilizers) Nicole Dimos (SPAA) John Sykes (Rural Consulting) Leighton Wilksch (FSG) |
|---|---|
| Year(s) | 2011 |
| Contributor | Society of Precision Agriculture Australia |
| Trial location(s) |
Rand, NSW
|
To compare the effects of using variable rate N and P on the yield of wheat and to determine if PA monitoring using satellite maps could be used to determine the need for N at or near growth stage Z31.
There was a visual response to P applied at sowing which resulted in additional yield at harvest. Responses were obtained to up to 10 kg/ha of P. The added net income was calculated as $44 /ha or a $3 return for every $1 spent. There was no visual response to applying N. This may have been a result of the dry pring and the time of application. There was no response to N at harvest. The co-operator was please that he noted a visual response to applying P that resulted in higher yields. The ack of N response was probably due to the dry weather in early October.
| Lead research organisation |
Society of Precision Agriculture Australia |
|---|---|
| Host research organisation | N/A |
| Trial funding source | GRDC SPA000010 |
| Related program | N/A |
| Acknowledgments | N/A |
| Other trial partners | David Wolfenden (Property owner ) |
| Crop type | Cereal (Grain): Wheat |
|---|---|
| Treatment type(s) |
|
| Trial type | Precision agriculture |
| Trial design | Not applicable |
| Sow date | Not specified |
|---|---|
| Harvest date | Not specified |
| Plot size | Not specified |
| Plot replication | Not specified |
| Fertiliser |
P rates of 0 to 20 kg/ha were applied using MAP at sowing. N rates of 0-80 kg/ha were applied as urea in early August near to growth stage Z32. |
| # | Variety |
Treatment 1
|
Treatment 2
|
Grain yield (t/ha) |
|---|---|---|---|---|
| 1 | █ Ventura | █ P @ 0kg/ha | █ N @ 0kg/ha | 3.1 |
| 2 | █ Ventura | █ P @ 0kg/ha | █ N @ 20kg/ha | 3.1 |
| 3 | █ Ventura | █ P @ 0kg/ha | █ N @ 40kg/ha | 3.2 |
| 4 | █ Ventura | █ P @ 0kg/ha | █ N @ 80kg/ha | 3 |
| 5 | █ Ventura | █ P @ 5kg/ha | █ N @ 0kg/ha | 3.5 |
| 6 | █ Ventura | █ P @ 5kg/ha | █ N @ 20kg/ha | 3.6 |
| 7 | █ Ventura | █ P @ 5kg/ha | █ N @ 40kg/ha | 3.5 |
| 8 | █ Ventura | █ P @ 5kg/ha | █ N @ 80kg/ha | 3.5 |
| 9 | █ Ventura | █ P @ 10kg/ha | █ N @ 0kg/ha | 3.7 |
| 10 | █ Ventura | █ P @ 10kg/ha | █ N @ 20kg/ha | 3.2 |
| 11 | █ Ventura | █ P @ 10kg/ha | █ N @ 40kg/ha | 3.2 |
| 12 | █ Ventura | █ P @ 10kg/ha | █ N @ 80kg/ha | 3.4 |
| 13 | █ Ventura | █ P @ 20kg/ha | █ N @ 0kg/ha | 3.5 |
| 14 | █ Ventura | █ P @ 20kg/ha | █ N @ 20kg/ha | 3.5 |
| 15 | █ Ventura | █ P @ 20kg/ha | █ N @ 40kg/ha | 3.4 |
| 16 | █ Ventura | █ P @ 20kg/ha | █ N @ 80kg/ha | 3.5 |
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to
construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol
16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.
