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Ram Dalal's Rule of Thumb
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Rams "Rule of
Thumb" calculator is based on
research that relates soil water and
nitate-N content measure at sowing to likely grain protein outcome. It is only valid for grain production regions of southern
Queensland and NW NSW and soils
sampled to depths greater than 60 cm. To use this calcualtor will you need to
input a reasonable reliable estimate
or measurement of available soil water (mm), soil nitrate-N
(kg/ha) to a measured soil depth. The output is a graph that shows the likely
grain protein % outcomes for a range of soil nitrate- N contents at a single
soil moisture. This graph can be used
to estimate the quantity of N required to change grain protein. To estimate the rate of extra N required to
increase grain protein content location the estimate current grain protein by :
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1. locatiing the availabe N on
the x axis and follow it vertically till it intersects the blue curve.
2. from the point on the blue curve find the correspoding grain protein
horizontally on the y axis.
3. locate the desired grain protein
on the y-axis and trace acroos to the bue curve horizontamly then at the point of intesection with the bu
cure trace down verticaly to the x
-axis
4. the distance between the new
soil nitrate-N and the original
soil nitrate-an is the suggested
increase to crop nitrogen supply to meet the new grain protein target
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Based on the data in
"Dalal RC, Strong WS, Weston EJ, Cooper
JE, and Thomas, GA 1997 Prediction of grain protein in wheat and
barley in a subtropical environment from available water and nitrogen in
Vertisols at sowing. Australian Journal of Experimental Agriculture, 37,
351-7."
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Disclaimer
While all reasonable efforts have been made to ensure that the information
provided in this Calculator can be relied on to the extent indicated, Back
Paddock Company P/L can not accept responsibility for inconvenience, material
loss or financial loss resulting from the use of this Calculator.
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