Response of mace wheat to potassium and nitrogen - Binnu


Research organisaton

Trial details

Researcher(s) N/A
Year(s) 2014
Contributor Northern Agri Group
Trial location(s) Site 9, Binnu, WA
Response of mace wheat to potassium and nitrogen - Binnu locations

To investigate responses to potassium and nitrogen in wheat. Wheat yeild and grain quality can be limited if either of these macro nutrients is in short supply.

Key messages

Potassium levels are low in this soil and this site should have been responsive to applied potassium, however due to seasonal and soil conditions there where no differences between treatments in this trial. The very dry June-August had a marked impact on crop growth, particularly tillering. This can be seen by the lack of differences in the head counts taken in September. Very hot conditions in early August also affected flowering in wheat and limited any response in grain yeild with later rains. Soil penetrometer readings in the paddock near the trial site showed hard pan and this in conjunction with the pH and Aluminium levels below 10cm would have restricted root growth and limited the wheat plants ability to access soil miosture at depth during the dry winter period. Without yield responses to applied treatments, crop return decreased as fertiliser rates increased.

Lead research organisation N/A
Host research organisation N/A
Related program N/A
Acknowledgments N/A
Other trial partners Not specified
Download the trial report to view additional trial information


Crop type Cereal: Wheat
Treatment type(s)
  • Fertiliser: Rate
Trial type Experimental
Trial design Blocked, randomised and replicated
Sow rate or Target density 75kg/ha
Sowing machinery Not specified
Sow date 8 May 2014
Plot size 20m x 2.05m
Plot replication 3
Plot blocking Not specified
Plot randomisation Not specified
Paddock history Not specified

At seeding 75kg/ha mapszc banded


8th May 2L/ha Triflurin 26th May 800ml/ha Velocity and Hasten @ 1%vv


200ml.ha dominex & 200ml/ha Lorsban

Fungicide Not specified
Pesticide Not specified
Soil amelioration Not specified
Seed treatment Not specified
Inoculant Not specified
Tillage Not specified
Other trial notes

Soil tests at the beginning of the trial show that potassium levels are low in this soil and this site should be responsive to applied potassium. pH was reasonable in the 0-10cm, however the pH and aluminum levels below 10cm could limit root growth at this site. Total rainfall in Binnu in 2014 was 281mm compared to an average of 341mm. The growing season rainfall was 262mm which was below the average 289mm, June, July and August rainfall was well below average. Very hot conditions were experienced in early August. Unfortunately grain samples were not retained at harvest so grain quality cannot be reported on or used in the calculation of wheat returns. Grain protein and screenings may have increased at higher nitrogen rates. Returns have been calculated using APW1 as the delivery grade.

Download the trial report to view additional method/treatment information

Trial results Table 1

# Variety
Treatment 1
Treatment 2
Head abundance (heads/m2) Fertiliser cost ($/ha) Grain yield (t/ha) Return on investment ($/ha)
1 Mace 0N 0K 119 66.68 1.48 408.41
2 Mace 0N 10K 115 79.44 1.57 424.54
3 Mace 0N 20K 117 92.2 1.62 427.83
4 Mace 0N 40K 113 117.72 1.6 395.89
5 Mace 30N 0K 110 102.15 1.69 440.34
6 Mace 30N 10K 122 114.91 1.65 414.74
7 Mace 30N 20K 119 127.67 1.49 350.62
8 Mace 30N 40K 114 153.19 1.51 331.52
9 Mace 60N 0K 122 150.53 1.62 369.5
10 Mace 60N 10K 112 163.29 1.61 353.53
11 Mace 60N 20K 114 176.05 1.6 337.56
12 Mace 60N 40K 121 201.57 1.49 276.73
13 Mace 90N 0K 117 193.1 1.58 314.09
14 Mace 90N 10K 117 205.86 1.56 294.91
15 Mace 90N 20K 109 218.62 1.65 311.04
16 Mace 90N 40K 122 244.14 1.57 259.84

Grain yield t/ha


Fertiliser cost $/ha


Head abundance heads/m2


Return on investment $/ha

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 9, Binnu, WA Yellow deep sand
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 9, Binnu, WA Chromosol
National soil grid Source
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



Site 9, Binnu WA 2014

Observed climate information
Rainfall trial gsr (mm) 262mm
Derived climate information
NOTE: Exact trial site locality unknown - Climate data may not be accurate
BOM Data source BINNU [768] 0km proximity to trial site location


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

SILO weather estimates sourced from
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.