Yield Prophet Lite

Demo

Yield Prophet Lite is a free tool that lets you estimate potential yield values for your crop given different rainfall amounts and fertiliser application rates. It also gives the rainfall likelihood for the remainder of the growing season. Start by choosing your crop.

WHEAT

BARLEY

CANOLA

OATS

Choose your nearest weather station

STATE

STATION NAME

Select by clicking the map

Water

STORED SOIL WATER
ON APR 1

GROWING SEASON
RAINFALL TO-DATE

A good rule of thumb for approximating stored soil water is one quarter of your summer rainfall.

If you don't know your GSR to-date, leave it blank and we'll get the data from your selected weather station.

Nitrogen

ESTIMATED SOIL N
ON APR 1

kgN/ha

N APPLIED
AT SOWING

kgN/ha

N APPLIED
AFTER SOWING

kgN/ha

Your estimated soil N should be in your soil test results.

Remember to list any N applications in kg of N and not kg of fertiliser!

Yield Prophet Lite calculates yield potential using the Sadras and Angus (2006) formula as follows:

Yield Potential = (Stored Soil Water + Growing Season Rainfall - Evaporation Coefficient) * Water-Use Efficiency

The evaporation co-efficients and default water use efficiencies (WUE) utilised in Yield Prophet Lite for each crop type are shown below. The default WUE values are the attainable yields for each crop type.

Crop	Evaporation Coefficient (mm)	Default Water-Use Efficiency (kg/mm)
Wheat	60	22
Barley	60	22
Canola	110	20
Oats	60	22

This tool provides an estimate of yield potential only - there are many reasons why a crop might not reach its yield potential.

Yield Prophet Lite calculates the Nitrogen-limited yield using the following formulas:

Yield = (Starting N + Sowing N + In-Season N + Mineralistion / Nitrogen Use Efficiency

N mineralisation (kg N/ ha) = 0.15 × OC (%) × GSR (Peter Ridge, unpublished)

Crop	Nitrogen-Use Efficiency (kgN/t)
Wheat	40
Barley	35
Canola	80
Oats	40

Reference:
Sadras VO, Angus JF (2006) Benchmarking water use efficiency of rainfed wheat in dry environments. Australian Journal of Agricultural Research 57, 847-856.

Choose your nearest weather station

Water

Nitrogen

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