Demonstration Trial of Sincocin and Agrispon on Potatoes (Solanum tubersum) in Southern Australia

Year of study:


Lead organisation & collaborators:

Richard B Jackson, Agricultural Consultant on behalf of a property in Thorpdale.


Richard B. Jackson

T: 03 5662 2565



Best available science assessment:


Conceptual model

Study design

Soil analysis

Production & financial

Method reporting

Data analysis

Results reporting











Project details


To identify yield benefits of the trial of Sincocin (soil conditioner) and Agrispon (soil biostimulant) on potatoes (Sebago).


Guano fertiliser (10% organic carbon content), can be used in low organic matter soils, to give it a kick start. This trial conducted fertiliser application and monitored subsequent impacts on yields. The fertilisers used indicate an increased nutrient release in soils and uptake of nutrients in plants.

Basis of trial:

Increased nutrient release and uptake in soils can be achieved using fertilisers.

Farm details

Management practices tested:

Fertiliser application

Trial site details:

12/6/1998- 15/1/1999

Erratic rainfall, irrigation used to supplement dry periods.

(Totalled 501mm over the 20 week growing period) 900mm annually

Sandy loam

Pre-trial management:

Cereal rye crop sown. The paddock had been cropped to potatoes in the previous season. Prior to this the paddock was in a pasture rotation.

Summary of key findings of trial:

The trial concluded that an increase of 19% yield is achieved through using Agrispon and/or Sincocin in the growing period of the crop.


Treatment results:

Variation in soil C with time and management influence:

The fertilisers used indicate an increased nutrient release in soils and uptake of nutrients in plants. Post-trial soil sampling did not measure organic carbon or pH, so no conclusion can be made about these responses.

Plot Baseline sample
Organic Carbon pH (CaCl2)
1 4.85% 4.5

Experimental design:

Trial design/layout:

8 parallel rows adjacent, 2 m wide and 100m long. 2 rows of planted potatoes fitted into this layout.


Low analysis fertiliser was applied (5:2:1) at 3 tonnes/ha. The crop was side-dressed with nitrogen-potash mix (20:0:16 at 125kg/ha).

Post emergent herbicide (Sencor) was used to control broad leaf weeds. Bravo was used as a preventative, Nitofol to control aphids.

Plot 1 Sincocin and Agrispon, 1L/ha each
Plot 2 Agrispon 2L/ha
Plot 3 Sincocin 1L/ha
Plot 4 Sincocin 2L/ha
Plot 5 Sincocin 3L/ha
Plot 6 Control
Plot 7 Sincocin and Agrispon, 2L/ha each
Plot 8 Control

The crop was sprayed on 3 occasions with Agrispon and Sincocin (backpack-pressured mister). (8/9/1998 at 10-15cm plants, 16/10/1998 at complete soil coverage and 10/11/1998 when the plants were quite dense).

Potatoes planted mechanically at a rate of 2.5 tonnes/ha.1000L/ha to saturate in the beginning, reduced on subsequent treatments.


How results have been reported

Technical report

How a copy of any relevant reports can be obtained

Richard B Jackson, Agricultural Consultant

Level of review of results

Internal technical review

Soil sampling method:2/6/1998,
1 plot26/11/1998, 1 per plot (8 in total) (Didn’t measure organic carbon or pH, but did measure nutrients)
Chemical test- P, K, S, pH, EC, Organic carbon, Cu, Zn, Mn, B, Fe, Ca, Mg, Na, K, Al (Baseline only)
Tissue sampling- 25/11/1998
Undertaken by Farmright Technical Services

Plant and/or animal production measurements

Potato yield was calculated. The trial concluded that an increase of 19% yield is delivered.

Plot 1 36.25tonnes/ha
Plot 2 42.5tonnes/ha
Plot 3 37.5 tonnes/ha
Plot 4 41.5tonnes/ha
Plot 5 40tonnes/ha
Plot 6 37.5tonnes/ha
Plot 7 41.25tonnes/ha
Plot 8 33.75tonnes/ha

Next steps

Targeting areas of continual cropping would be advantageous (particularly winter cereals).Replication of the trial plots would enhance the attention and credibility in the scientific world. Treatment plot sizes could be reduced to obtain the same scientific significance.Conducting the trials over successive years in the same plots would also increase agronomic understanding. In addition, a trial using 2 sprays per season would be useful to assess this impact.