Phosphorus response curve for peas and the effect of starter nitrogen


Research organisaton

Trial details

Researcher(s) Andrew Speirs (Hi-Fert)
Year(s) 2003
Contributor Southern Farming Systems
Trial location(s) Gnarwarre, VIC
Phosphorus response curve for peas and the effect of starter nitrogen locations
  • To develop a phosphorus response curve for Peas (cv. Kaspa) in the high rainfall zone of South West Victoria.
  • Investigate responses to zinc and starter nitrogen in last sown legume crops.
  • To investigate if MAP is a cost effective phosphorus fertiliser for legumes and its impact on plant growth.
Key messages

The apparent better performance of MAP T3 is noted but when looking at the other MAP based products they don't follow the same trend. There was no significant response to applied phosphorus, sulphur or zinc. The CV of the trial is quite high, meaning that a 0.48 Tonnes/ha yield response was needed for anything to be significant. There was no negative effect of applying starter nitrogen in this trial, however there was no positive effect. At current pricing the MAP based products are a very cost effective source of phosphorus and sulphur regardless of the starter nitrogen. Tissue tests indicated all nutrients were adequate see Table 99.

Lead research organisation N/A
Host research organisation N/A
Related program N/A
Acknowledgments N/A
Other trial partners Not specified
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Crop type Field peas
Treatment type(s)
  • Fertiliser: Type
  • Fertiliser: Rate
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Gnarwarre 2003

Sow date 4 August 2003
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Variety
Treatment 1
Grain yield (t/ha)
1 Kaspa MAP 3.07
2 Kaspa Super M (+ 5 N & 6 S) 2.84
3 Kaspa Super M (+15 P as TSP) 2.81
4 Kaspa SSP 2.77
5 Kaspa NIL (+ 12 N and 15 S) 2.69
6 Kaspa MAP Zn 2.5 2.67
7 Kaspa MAP Zn 5.0% 2.62
8 Kaspa T.S.P 2.61
9 Kaspa Super M/S95/MAPZn5.0 2.6
10 Kaspa Super M 2.6
11 Kaspa T.S.P 0.79/S95 0.21 2.59
12 Kaspa Super M/MAP 5.0%Zn 2.52
13 Kaspa MAPS impreg 2.3

Grain yield t/ha

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Gnarwarre, VIC Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Gnarwarre, VIC 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



Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Gnarwarre VIC


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.

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Trial last modified: 14-11-2019 15:24pm AEST