1. Fertilizer Decisions 2018 - Trial Nutrient Responses
West Midlands Group
20 March 2018

2. Key messages Potassium is different Phosphorus is extremely important
Responses to applied K unpredictable
Adequate K increases the efficiency of in-season N & P applications
Phosphorus is extremely important
Set the foundation for achieving yield potential
Consider crop nutrition after soil amelioration
Feed the increased yield potential for quicker payback and better returns
Relative value of phosphorus and nitrogen
Inadequate P status decreases the efficiency of in-season N applications

3. P and K strategies, Badgingarra 2017
Potassium requirements for wheat after lupins
Associated phosphorus responses

4. P and K strategies, Badgingarra 2017
WMG Main trial site – White’s
Depth
NO3-
NH4+ OC P
PBI K S
pH(Ca) Al
0-10cm 25
4.5
1.55 15 11 62 10
5.18
0.55
10-20cm 7 3
0.93 4
4.23
1.3
20-30cm
2.5
1.5
0.3 18 14
4.31
0.85
Crop Variety
Scepter Wheat
Sowing Date
8th June
Seeding Rate
65 kg/ha
Soil Type
Sand

5. P and K strategies, Badgingarra 2017
No.
Treatment
Banded
(kg/ha)
IBS
Nutrients Applied (kg/ha) P K N 1
P0 K0
48 Urea
120 2
P8 K0
40 Urea, 35 MAP 8 3
P16 K0
31 Urea, 70 MAP 16 4
P24 K0
22 Urea, 105 MAP 24 5
P32 K0
13 Urea, 140 MAP 32 6
P0 K20
48 Urea, MOP 20 7
P8 K20
40 Urea, 35 MAP, MOP
P16 K20
31 Urea, 70 MAP, MOP 9
P24 K20
22 Urea, 105 MAP, 40 MOP 10
P32 K20
13 Urea, 140 MAP, 40 MOP 11
P0 K40
40 MOP 40 12
P8 K40 13
P16 K40 14
P24 K40 15
P32 K40
P0 K60
80 MOP 60 17
P8 K60 18
P16 K60 19
P24 K60
P32 K60 21
P0 K80
120 MOP 80 22
P8 K80 23
P16 K80
P24 K80 25
P32 K80
5 Phosphorus rates
0, 8, 16, 24 & 32 kg P/ha
5 Potassium rates
0, 20, 40, 60 & 80 kg K/ha

6. Results, Badgingarra 2017 No biomass or yield response to K
53% yield response from 0 to 32P
Highest returns were generated from 32P and 20K

7. Yield responses, Badgingarra 2017

8. K and P strategies, Goomalling 2017
Potassium requirements for wheat after high canola yields
Optimal strategy and form for applying potassium
Associated phosphorus rates

9. K and P strategies, Goomalling 2017
Haywood’s, Donald Road
Depth
NO3-
NH4+ OC P
PBI K S
pH(Ca) Al
0-10cm
9.3
1.5
0.79 18 19 25 16
5.53
0.1
10-20cm
3.6
1.1
0.54 28 34 41 12
4.65
0.7
20-30cm
2.5
<1
0.28 27 49 52 22
4.32
2.2
Crop Variety
Calingiri Wheat
Sowing Date
24th May
Seeding Rate
65 kg/ha
Soil Type
Loamy Sand

10. K and P strategies, Goomalling 2017
No.
Treatment P K N 1
Nil P, Nil K 70 2
Muriate of Potash at seeding 20 kg/ha banded 10 3
Muriate of Potash split 20 kg/ha banded + 20 kg/ha IBS 20 4
MAPSZC 25 kg/ha banded 5
MAPSZC+MOP blend 55:45, 45 kg/ha banded 6
MAPSZC+MOP blend 55:45, 45 kg/ha banded + MOP 20 kg/ha IBS 7
Vigour compound 42 kg/ha 8
MAPSZC 50 kg/ha banded 9
MAPSZC+MOP blend 70:30, 70 kg/ha banded
MAPSZC+MOP blend 70:30, 70 kg/ha banded + MOP 20 kg/ha IBS 11
Vigour compound 83 kg/ha 12
Vigour compound 125 kg/ha 15

11. Harvest results, Goomalling 2017
No significant response to K, although Vigour was notable with lower total K than equivalent P treatments

12. Returns from K and P application

13. Value of K – South Bodallin 2017
Calingiri wheat on sand over sandy loam
Depth
NO3-
NH4+ OC P
PBI K S Cu Zn
pH(Ca) Al
0-10cm
11.3
1.8
0.63 28 27 46 6
0.39
0.62
5.4 1
10-20cm
3.1
2.7
0.38 29
46.7 42 9
0.37
0.26
4.3
5.0
20-30cm
2.2
1.5
0.16 5
62.5 37 24
0.25
0.15
6.3
4 Phosphorus rates
0, 6, 12 & 18 kg P/ha as TSP or MAPSZC
4 Nitrogen rates
0, 20, 40 & 60 kg N/ha as Urea or UAN
2 Potassium rates - across all N & P rates
0 & 20 kg K/ha as MOP

14. Value of K – South Bodallin 2017
Biomass (NDVI) increases with increasing N and P rates.
Incorporation of K further improves plant biomass and growth.

15. Value of K – South Bodallin 2017
Significant yield improvement from N, P & K

16. Value of K – Ballidu 2015 4 Phosphorus rates 4 Nitrogen rates
Mace wheat on sandy loam
Depth
NO3-
NH4+ OC P
PBI K S Cu Zn
pH[Ca] Al
0-10cm 12 1
0.5 14 36 6
1.3
0.31
5.47
10-20cm
0.7 15 35 4
4.47
3.1
4 Phosphorus rates
0, 6, 12 & 18 kg P/ha as TSP or MAPSZC
4 Nitrogen rates
0, 25, 50 & 75 kg N/ha as Urea or UAN
2 Potassium rates - across all N & P rates
0 & 25 kg K/ha as MOP

17. Value of K – Ballidu 2015
Significant yield improvement from N, P & K

18. Key messages Potassium is different Phosphorus is extremely important
Responses to applied K unpredictable
Adequate K increases the efficiency of in-season N & P applications
Phosphorus is extremely important
Set the foundation for achieving yield potential

19. Soil Amelioration & Nutrition

20. P x N +/- Ripping – Burracoppin 2017
Calingiri wheat on compacted, acidic sand
Lime 2t/ha, spread and incorporated, January 2016, Canola crop 2016
Depth
NO3-
NH4+ OC P
PBI K S Cu Zn
pH(Ca) Al
0-10cm 5 1
0.45 20
38.8 37 8
0.22
0.14
7.1
1.20
10-20cm 2
0.28 11
40.1 40 17
0.17
0.12
5.3
1.3
20-30cm
54.2 27 29
0.08
4.4
5.20
Lime 2t/ha, spread & incorporated, January 2016 & ripped 30-35cm, Canola crop 2016
Depth
NO3-
NH4+ OC P
PBI K S Cu Zn
pH(Ca) Al
0-10cm 4 1
0.35 15
39.8 29 7
0.25
0.2
6.1
1.5
10-20cm 2
0.32 9
41.5 25 13
0.17
0.1
5.8
1.4
20-30cm 3
0.18 5
63.6 34
0.12
4.4
3.70
Soil tests April 2017

21. P x N +/- Ripping – Burracoppin 2017
Good summer rain, dry autumn & early winter

22. P x N +/- Ripping – Burracoppin 2017
No.
Treatment
Seeding Product
(kg/ha)
Top Up
(L/ha) N P K S 1
P0 N0
40 MOP 20 2
P0 N30
62 Urea, 8 MAXam, 40 MOP 30 3
P0 N60
71 UAN 60 4
P0 N90
142 UAN 90 5
P0 N120
213 UAN
120 6
P6 N0
22 TSP, 16 SSP, 40 MOP 7
P6 N30
30 MAPSZC, 57 Urea, 40 MOP 8
P6 N60 9
P6 N90 10
P6 N120 11
P12 N0
53 TSP , 14 SSP , 40 MOP 12
P12 N30
30 MAPSZC, 57 Urea, 30 TSP, 40 MOP 13
P12 N60
30 MAPSZC. 57 Urea, 30 TSP, 40 MOP 14
P12 N90 15
P12 N120 16
P18 N0
83 TSP, 12 SSP, 40 MOP 18 17
P18 N30
30 MAPSZC. 57 Urea, 60 TSP , 40 MOP
P18 N60
30 MAPSZC, 57 Urea, 60 TSP, 40 MOP 19
P18 N90
P18 N120 21
P24 N150
30 MAPSZC, 57 Urea, 90 TSP, 40 MOP
284 UAN
150 24
5 Phosphorus rates
0, 6, 12, 18 & 24 kg P/ha
6 Nitrogen rates
0, 30, 60, 90, 120 & 150 kg N/ha

23. Plant growth, Burracoppin
Limited biomass response to N & P without ripping

24. Title

25. Harvest results, Burracoppin 2017

26. Yield & Gross Margin, Burracoppin

27. Key message Nutrition Considerations after soil amelioration
Feed the increased yield potential for quicker payback and better returns

28. P influences N efficiency

29. P influences N efficiency

30. Key message Relative value of phosphorus and nitrogen
Inadequate P status decreases the efficiency of in-season N applications

31. Summary Potassium is different Phosphorus is extremely important
Responses to applied K unpredictable
Adequate K increases the efficiency of in-season N & P applications
Phosphorus is extremely important
Set the foundation for achieving yield potential
Nutrition Considerations after soil amelioration
Feed the increased yield potential for quicker payback and better returns
Relative value of phosphorus and nitrogen
Inadequate P status decreases the efficiency of in-season N applications