Wheat inputs experiment


Research organisatons
Funding source
Riverine Plains John Sykes Rural Consulting

Trial details

Researcher(s) John Sykes (John Sykes Rural Consulting)
Year(s) 2009
Contributor Riverine Plains
Trial location(s) Balldale, NSW
Wheat inputs experiment locations

To assess the effect of varying the seed rates and fertiliser inputs on wheat yeilds.

Key messages
  • Trial reveals that 70 plants per square metre (about 35kg seed) and 5-10 kilograms per hectare of phophorus represent the optimal target plant density and phosphorous input level for wheat.
  • Similar yeild results can be obatained using a number of combinations of seed and fertiliser.
  • Low tiller numbers can be recovered by using light amounts of nitrogen.
Lead research organisation John Sykes Rural Consulting
Host research organisation Riverine Plains
Trial funding source GRDC
Related program N/A

Mr C Cay, Mrs S Cay

Other trial partners Not specified
Download the trial report to view additional trial information


Crop type Cereal (Grain): Wheat
Treatment type(s)
  • Fertiliser: Type
  • Sowing: Rate
Trial type Experimental
Trial design Replicated

Balldale 2009

Sow date 23 May 2009
Harvest date Not specified
Plot size 1.5m x 16m
Plot replication 3

Phosphorus applied as triple super split application at sowing and at Z15.

Soil amelioration

pH (CaCl2) 5.2, Phosphate (Collwell) 46mg/kg, Deep soil N 110kg/ha

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Variety
Treatment 1
Treatment 2
Treatment 3
Plant density (plants/m2) Gross margin ($/ha) Grain yield (t/ha)
1 Ventura 70kg seed 0N 0P 156 243 1.9
2 Ventura 70kg seed 0N 5P 163 297 2.4
3 Ventura 70kg seed 0N 10P 141 361 2.9
4 Ventura 70kg seed 0N 20P 154 383 3.2
5 Ventura 70kg seed 20N @ Z31 20P 141 287 2.8
6 Ventura 35kg seed 0N 0P 70 244 1.9
7 Ventura 35kg seed 0N 5P 70 341 2.6
8 Ventura 35kg seed 0N 10P 74 406 3
9 Ventura 35kg seed 0N 20P 74 403 3.2
10 Ventura 35kg seed 20N @ Z15, 20N @ Z31 5P 71 289 2.6
11 Ventura 35kg seed 20N @ Z31 5P 78 310 2.7
12 Ventura 35kg seed 20N @ Z15, 20N @ Z31 10P 64 414 2.4
13 Ventura 35kg seed 40N @ Z31 10P 68 332 3
14 Ventura 35kg seed 20N @ Z15, 20N @ Z31 20P 66 391 3.5
15 Ventura 35kg seed 40N @ Z31 20P 70 410 3.6
16 Ventura 35kg seed 0N 5P sow & 15P @ Z31 70 389 3.5
17 Ventura 35kg seed 20N @ Z15, 20N @ Z31 5P sow & 15P @ Z31 67 387 3.5
18 Ventura 150kg seed 20N @ Z31 20P 258 27 1.4
19 Ventura 15kg seed 20N @ sowing 20P 35 202 2.4
20 Ventura 70kg seed 20N @ Z31 0P 140 267 2.3
21 Ventura 70kg seed 20N @ Z31 10P as SS 143 270 2.5

Grain yield t/ha


Gross margin $/ha


Plant density plants/m2

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Balldale, NSW Red chromosol
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Balldale, NSW Sodosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Balldale NSW
2009 509.8mm
2008 487.3mm
2007 433.2mm
2006 434.0mm
2005 488.1mm
2004 450.6mm
2003 412.0mm
2002 388.0mm
2001 437.6mm
2000 454.4mm
National soil grid Source: CSIRO/TERN
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties



Balldale NSW 2009

Observed climate information

Rainfall trial gsr (mm) 281mm

Derived climate information

Balldale NSW


Some data on this site is sourced from the Bureau of Meteorology

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.

Trial report and links

2009 trial report

Trial last modified: 03-09-2019 13:59pm AEST