Previous Page Table of Contents Next Page

Appendix Two - A comparison of three technologies for the production of gari

Source: ITDG, 1988 Food Technology Source Books: Root Crop Processing


Traditional Labour intensive

Post-traditional Intermediate

Modern Fully mechanised

Raw Material production and supply

Small holder production
Yield: c. 10 (t/hectare/yr)
From traders

Smallholder production
Yield: c. 10 (t/hectare/yr)
From traders

Factory plantation or smallholder coop.
Yield: 10-25t/hectare/yr From purchasing agents or factory plantations.

Peeling and washing

Manual: 38 kg/pers. hour 25 % raw material loss

Manual: 38kg /pers./ hour; 25% raw material loss

Mechanical abrasive peeler, 30% raw material loss

Size reduction

Manual: 23 kg/ pers. hour
Mechanical: 200kg/hr

Manual: 23 kg/pers. hour
Mechanical: 200 kg/hour

Mechanical: hammer mill (imported), 1500 kg/hr


Fermentation and dewatering in heavily weighted cloth or nylon bags

Batch fermentation in (aluminium) tanks

Batch fermentation in (aluminium) tanks


See 4 above

Semi-mechanised: locally made hydraulic or mechanical press

Mechanised: hydraulic press


Manual: woven fibre screen

Semi-mechanised: locally made screen with hand or mechanically driven paddle

Mechanised: motorised rotary screen


Manual; cast iron pan over wood fire(combined stage with drying): 2.2 kg/pers. hr

Semi-mechanised: locally made wood burning fryer(combined stage kg/pers. hr with drying): 70 kg/pers. hr

Mechanised: rotary kiln heated by oil burners 450 kg/hr.


See 7 above

See above

Mechanised rotary drum drier

Milling and sieving

Not necessary
Sieving: locally made

Milling: not required Sieving: vibrating hand or mechanical sieve

Milling: disc mill Sieving: vibrating multideck sieve


50 Kg jute sacks

50 kg heat sealed polyethylene bags

50 kg heat sealed polyethylene bags

Material handling (all stages)


Manual, with trolleys

Belt conveyors, bucket elevators with trolleys

Marketing and distribution

Through traditional gari trade system in local markets

Through traditional trade system and super markets

Through traditional trade system and supermarkets


All income groups, rural and urban

Mainly urban higher income groups and institutions (e.g. school, army)

Mainly urban higher income groups and institutions (e.g. schools, army)


600 m

200 m

650 m

Employees per shift total








Predominantly female

Predominantly male

Previous Page Top of Page Next Page