Understanding Pasture Covers; Pasture Cover Equation Adjustment - C-Dax pasture meter+ Operation Manual

Understanding Pasture Covers

Pasture Cover Equations are used to convert the height of the grass measured
into the more useful Pasture Dry Matter, displayed as Kilograms per Hectare
(KgDM/Ha). There is more than one pasture cover equation available, and you
need to make sure that you enter the correct equation to suit the seasonal growth
stage of the grass. Equations are continually evolving for different regions and
pasture species. Contact C-Dax or visit our website to find up to date equations
that suit your conditions.
A set of suggested pasture cover equations have been developed for typical New
Zealand ryegrass and clover mix pastures, under non-irrigated conditions. Under
irrigated conditions, the pasture cover equation designed for use in Winter may
be appropriate all year round. As a starting point use the following equation:
KgDM/ha = Pasture height x 18.6 + 750

Pasture cover equation adjustment

•
If low covers are reading too high on the Pasturemeter+ then reduce the adder
•
If low covers are reading too low on the Pasturemeter+ then increase the adder
•
If high covers are reading too high on the Pasturemeter+ then reduce the factor
•
If high covers are reading too low on the Pasturemeter+ then increase the factor
Keep in Mind
Because the Pasturemeter+ uses a standing height measurement, it may give
slightly different results to that of a Rising Plate Meter, in some circumstances.
The accuracy of a Rising Plate Meter is typically +/- 300KgDM/ha, however
unlike a Rising Plate Meter, the Pasturemeter+ is not dependant on operator
technique to achieve consistent results.
N.B. For information on DIY and seasonal calibration refer to page 66 of
this manual.
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