Tactical nitrogen using NDVI, N-gauges and in-season N calculator

2015

Research organisaton

Trial details

Researcher(s) Shane Turner
Year(s) 2015
Contributor Northern Agri Group
Trial location(s) Site 4, East Binnu, WA
Tactical nitrogen using NDVI, N-gauges and in-season N calculator locations
Aims

Demonstrate and evaluate nitrogen rich strips (NGauges) and Normalised Difference Vegetation Index (NVDI) measurement as a decision support tools to guide economic application of nitrogen duringthe growing season.

Key messages

N Calculator recommendation was accurate for 9 weeks after sowing (WAS) application with additional nitrogen not increasing yeild. The recommendation was slightly below optimumfor 7 WAS. Achieving close to the target 10.5% protein indicates that recommended N rates were utilised to optimise growth and yeild and application of N was not deficient or excessive. This provides confidence to incorporate the use of N Gauges and the N-calculator to assist in making N application decisions to wheat crops during the season based on the growth status of the crop. Summit will continue further testing of the N Calculator under differedt seasonal consitions in the noerthern Wheatbelt and the effect if timining of NVDI assessment and N-Calculator recommendations on yield response to in season N applications.  

Lead research organisation N/A
Host research organisation N/A
Related program N/A
Acknowledgments

Trevor Bell and Steve Cosh and the technical team at DAFWA, Geraldton for trial site establishment and management work.


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

Method

Crop type Cereal: Wheat
Treatment type(s)
  • Fertiliser: Rate
  • Fertiliser: Timing
Trial type
Trial design
Sow rate or Target density 70kg/ha
Sowing machinery Not specified
Sow date 18 May 2015
Plot size 10m
Plot replication 3
Plot blocking Not specified
Plot randomisation Not specified
Paddock history Not specified
Fertiliser Not specified
Herbicide Not specified
Insecticide Not specified
Fungicide Not specified
Pesticide Not specified
Soil amelioration Not specified
Seed treatment Not specified
Inoculant Not specified
Tillage Not specified
Other trial notes Not specified
Download the trial report to view additional method/treatment information

Trial results Table 1

# Variety
Treatment 1
Treatment 2
Treatment 3
Gross margin ($/ha) Grain yield (t/ha) Protein (%)
1 Mace N at sowing 0 kg/ha 554 2.24 10.43
2 Mace N at sowing 6 kg/ha 552 2.28 10.37
3 Mace N at sowing 90 kg/ha 629 3.06 10.9
4 Mace N at 7 WAS 18 kg/ha  100% of recommendation from N Calculator rate from NVDI strips A:C  590 2.45 10.33
5 Mace N at 7 WAS 6 kg/ha Nil N top up 625 2.54 10.4
6 Mace N at 7 WAS 12 kg/ha 50% of recommendation from N Calculator rate from NVDI strips B:C 456 1.96 10.47
7 Mace N at 7 WAS 17 kg/ha 100% of recommendation from N Calculator rate from NVDI strips B:C 589 2.46 10.43
8 Mace N at 7 WAS 23 kg/ha 150% of recommendation from N Calculator rate from NVDI strips B:C 643 2.68 10.47
9 Mace N 9 WAS 25 kg/ha 100% of recommendation from N Calculator rate from NVDI strips A:C 568 2.39 10.5
10 Mace N 9 WAS 6 kg/ha Nil N top up 508 2.12 10.37
11 Mace N 9 WAS 17 kg/ha 50% of recommendation from N Calculator rate from NVDI strips B:C 505 2.14 10.57
12 Mace N 9 WAS 27 kg/ha 100% of recommendation from N Calculator rate from NVDI strips B:C 690 2.85 10.7
13 Mace N 9 WAS 37 kg/ha 150% of recommendation from N Calculator rate from NVDI strips B:C 607 2.6 10.53

Grain yield t/ha


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Gross margin $/ha


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Protein %


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Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 4, East Binnu, WA Yellow sands
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 4, East 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

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Climate

Site 4, East Binnu WA 2015


Observed climate information
Rainfall trial gsr (mm) 260mm
Derived climate information
NOTE: Exact trial site locality unknown - Climate data may not be accurate
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BOM Data source BINNU [768] 0km proximity to trial site location


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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.