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light emitting and sensing photodiode array at 20 mm spacing. The pasturemeter can take numerous pasture cover readings (200 per second) across a paddock and can be used at speeds up to 20 km/h. Pasture mass is calculated from sward height with manufacturersupplied or user-defined equations. The pasturemeter could reduce the time required to obtain paddock level estimates of pasture mass and has low inter-operator variation due to minimal operator input. Other mass estimation methods can show large variation between operators due to technique or subjectivity. Minimal operator training is necessary to ensure a representative paddock sampling. However, the manufacturer-supplied pasturemeter calibration equations have been developed using ryegrass/white clover (Lolium perenne/Trifolium repens) pastures at a limited number of localities. The warm temperate Northland climate has allowed the widespread establishment of kikuyu (Pennisetum clandestinium), a C4 grass. In typical Northland dairy pastures, the relative importance of kikuyu and ryegrass changes markedly throughout the year. Kikuyu competes strongly with more desirable ryegrass during summer/ autumn but is inhibited in winter. Strong ryegrass growth and cooler temperatures in spring restricts kikuyu spread. High stolon density in established kikuyu increases the pasture density near the sward base. While stolons contribute little to grazeable mass, they can have a highly variable effect on pasture mass estimation technologies (Fulkerson & Slack 1993). The aim of this study was to assess the accuracy of the C-DAX Rapid Pasturemeter and the rising plate meter (RPM) in Northland dairy pastures using manufacturersupplied calibrations and then to develop calibrations specifically for those pastures.

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