This study reported the effect of re-calibration of some imported farm machinery
introduced into Nigeria due to variability of peculiar factors. Therefore, for optimum performance
of the imported farm machinery, timely calibration with standardized instruments prior to field
operation is inevitable. Hence the study, investigates the effective method that will support accurate
calibration of farm machinery in Nigeria. Precision pneumatic planter and boom sprayer were
selected for this study. Static and dynamic methods of calibration of farm machinery were adopted.
Parameters measured were: wheel speed, gear combination, tractor speed and pump pressure to
determine optimum seed planting and herbicides discharge rates for both the pneumatic planter
and boom sprayer respectively. Descriptive statistics was used for data analysis. The results showed
that dynamic method was more accurate than static calibration method. The re-calibration
parameters for precision pneumatic planter were 26/30 and 110 rev/min for gear combination and
wheel speed; while that of boom sprayer were 1.3m/s and 6 bar for tractor speed and pump pressure
respectively.
Keywords: Re-calibration, static method, dynamic method, precision pneumatic planter, boom prayer
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