Tracing the amount of crop nitrogen coming from the previous wheat stubble

2015

Research organisaton
Funding source

Trial details

Researcher(s) Vadakattu Gupta, Therese McBeath (CSIRO) and Claire Browne (BCG)
Year(s) 2015
Contributor Birchip Cropping Group
Trial location(s) Site 4, Horsham, VIC
Further information View external link
Tracing the amount of crop nitrogen coming from the previous wheat stubble locations
Aims

To ascertain the amount and availability of N under varying stubble management practices and soil environments.

Key messages
  • Only 31 per cent of the applied urea nitrogen (N) was taken up by the wheat crop in 2014. This low fertiliser use efficiency may be partly related to the season; unused N in the soil can benefit the following crop.
  • In a decile 1 season, different stubble retention practices had no effect on microbial biomass and N supply potential (avg. 58kg N/ha).
  • Labelling a wheat crop with 15N allows researchers to quantify the fertiliser use efficiency and trace the N from stubble to the subsequent crop.
Lead research organisation N/A
Host research organisation N/A
Trial funding source GRDC BWD00024,CSP00186
Related program Maintaining profitable farming systems with retained stubble
Acknowledgments

This research was funded by the GRDC as part of the Maintaining profitable farming systems in retained stubble project– Component 1 project (CSP00186) and BWD00024. Thanks to Bill Davoren, Paul Adkins, Stasia Kroker, Steve Szarvis, Drew Ernakovich CSIRO for the provision of technical assistance.


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

Method

Crop type Wheat
Treatment type(s)
  • Crop: Rotation
  • Fertiliser: Method
Trial type Experimental
Trial design Unknown

Horsham 2015

Sow rate or Target density 100 plants/m²
Sowing machinery

Knife points, press wheels, 30cm row spacing

Sow date 2 June 2015 2 June 2015
Harvest date 16 November 2015 16 November 2015
Plot size Not specified
Plot replication Not specified
Fertiliser

MAP @ 46kg/ha plus Granulock Supreme Z @ 34kg/ha  (these rates were to balance nutrients).

Herbicide

Weeds were controlled to best management practice.

Insecticide

Pests were controlled to best management practice.

Fungicide

Diseases were controlled to best management practice.

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Fertiliser nitrogen uptake (%) Harvest index (value) Stubble yield (t/ha) Stubble nitrogen uptake (kg N/ha) Grain yield (t/ha) Nitrogen uptake (kg N/ha) C:N stubble ((ratio))
1 Karoonda 35 0.41 3.31 16 2.51 66 95
2 Horsham 31 0.32 4.7 38 2.19 97 56
3 Temora 40 0.28 8.38 55 3.29 142 57

Grain yield t/ha


Loading

C:N stubble (ratio)


Loading

Fertiliser nitrogen uptake %


Loading

Harvest index value


Loading

Nitrogen uptake kg N/ha


Loading

Stubble nitrogen uptake kg N/ha


Loading

Stubble yield t/ha


Loading
Observed trial site soil information
Trial site soil testing
Site Depth Type pH EC P K N A OC CAT
Site 4, Horsham, VIC 0 - 10cm heavy clay 6.90 46.00 1.10
Site 4, Horsham, VIC 0 - 70cm Heavy clay 125.00
Soil conditions
Trial site Soil texture
Site 4, Horsham, VIC Heavy clay (black)
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 4, Horsham, VIC Vertosol
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

Loading

Climate

Site 4, Horsham VIC 2015


Observed climate information

Rainfall trial total (mm) 228mm
Rainfall trial gsr (mm) 125mm

Derived climate information

Site 4, Horsham VIC

NOTE: Exact trial site locality unknown - Climate data may not be accurate
Loading
Loading
Loading

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.




CC BY
Individual Trial Project data and information and OFT metadata are licensed under a Creative Commons Attribution 4.0 International License.
The data and information accessed through OFT may also be subject to Terms of Use specified by the Trial Contributor,
in which case the Terms of Use of a Trial Contributor take precedence over other information provided on OFT.
Trial last modified: 16-07-2019 14:21pm AEST