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Follow the links below to find material targeted to the unit's elements, performance criteria, required skills and knowledge

Elements and Performance Criteria

1. Prepare a working sample
   • Obtain pure seed following a purity analysis or as a representative fraction of a submitted sample
   • Use mechanical dividers where appropriate
   • Maintain moisture content of working sample before counting through storing it in moisture-proof containers
   • Complete labelling and records
2. Count and weigh seed by machine
   • Put the entire working sample through a counting machine and record the total number of seeds indicated
   • Weigh working sample to the required number of decimal places
3. Count and weigh replicates by hand
   • Count out eight replicates of 100 seeds randomly from the working sample
   • Weigh each replicate to the required number of decimal places
   • Record weights of each replicate
   • Calculate variance, standard deviation and coefficient of variance
   • Test a new set of replicates where the coefficient of variance exceeds the prescribed value
   • Determine the average weight of 1000 seeds where the coefficient of variance does not exceed the prescribed value
4. Report results
   • Report results of weight determination under "other determinations" to the prescribed number of decimal places
   • Report the method used and the results calculated

Range Statement

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Performance Evidence

The candidate must be assessed on their ability to integrate and apply the performance requirements of this unit in a workplace setting. Performance must be demonstrated consistently over time and in a suitable range of contexts.

The candidate must provide evidence that they can:

calculate variance, standard deviation and coefficient of variance

determine the weight per 1000 pure seeds from a submitted sample

prepare and weigh replicates

report results

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Knowledge Evidence

The candidate must demonstrate knowledge of:

apparatus for weighing, counting and dividing seed samples

calculations such as variance, standard deviation and coefficient of variance

concepts of metrology

enterprise standard operating procedures (SOPs)

relevant health, safety and environment requirements

role of the International Seed Testing Association (ISTA) and the ISTA Rules for Seed Testing

seed biology

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