Calibration of the C-DAX Rapid Pasturemeter and the rising plate meter for kikuyu-based Northland dairy pastures

摘要

Accurate estimation of pasture mass is essential for managing farm systems for top performance. The C-DAX Rapid Pasturemeter has the potential to provide fast accurate estimates of pasture mass. However, the Pasturemeter has been calibrated for 'typical' temperate dairy pastures and its suitability for use on kikuyu (Pennisetum clandestinium)-based pastures in Northland, is unknown. This study determined the accuracy of the technology for estimation of pasture mass on kikuyu/ryegrass-based dairy pasture on the Northland Agricultural Research Farm at Dargaville, New Zealand. Monthly pasturemeter and rising plate meter (RPM) measurements were made over a year and compared with quadrat cut data. Large seasonal variations in the pasturemeter calibrationat Dargaville reflected changes in pasture composition, although no specific kikuyu influence could be determined. Both the pasturemeter and the RPM benefit from the use of different seasonal calibration equations, specific to the region. The pasturemeter and RPM show similar accuracies for biomass (dry matter yield) estimation in Northland.