Friday, November 23, 2012

Creating awareness on labor-saving technologies for weed control in rice production : Africa RISING Success Stories

Weeds are one of the major constraints to rice production in sub-Saharan Africa. Without control, they can cause yield losses ranging from 28% to 89%. 

One major contributing factor is the lack of knowledge and information on labor-saving weed control and management technologies among farmers and extension workers.      

The jumpstart project on ‘Building local capacities in weed management for rice-based systems’ led by the Africa Rice Center (AfricaRice), sought to remedy this by creating awareness on available and appropriate labor-saving and efficient weed management practices to boost the crop’s production.

It targeted research and development (R & D) partners, the private sector, and farmers involved in rice-based production systems in Tanzania.

R&D professionals and students

The project conducted a one-day training at the Sokoine University of Agriculture (SUA) in Morogoro, Tanzania, for 22 R&D professionals and 15 weed science students on weed control and management practices and on the use of an online interactive weed identification tool, AFROweeds.

The workshop also aimed at enhancing networking between national and regional weed scientists by introducing the open-access online African weed science network Weedsbook. This network includes researchers from international and national research organizations, government extension officers, university lecturers and students. 

“Weed is the number one constraint in rice production in many countries in Africa and awareness on sustainable and cost-effective ways to control them in rice-based systems is low. In this project, we wanted to not only build capacity but also enhance the network of weed scientists and other people interested in weeds for easy knowledge and information sharing among each other,” Jonne Rodenburg, a weed scientist at AfricaRice and the research team leader, explained.

The project further organized a training for blacksmiths drawn from all over the country on fabrication of rotary weeders to control weeds of lowland rice so as to make them widely available and at competitive prices for the farmers.

Currently, farmers mostly rely on hand or hoe weeding and both are extremely time and energy-consuming. The rotary weeders are hand-operated devices that can be easily manufactured by local blacksmiths using locally available materials. They are very popular in Asian countries but in Africa, they are only found in Madagascar.

Three new types of weeders were fabricated during the workshop and two were selected for promotion in the country after subjecting them to further on-farm testing with the farmers. Technical drawings are currently being produced which will enable even more blacksmiths to produce these weeders. 

“We wanted to build local capacities to manufacture locally adapted rotary weeders for resource-poor farmers in Tanzania. We showed the diversity of mechanical weeders and that they can be adjusted to suit local conditions or preferences of the end-user (the farmer),” Rodenburg said. 

The project has also developed two farmer-to-farmer videos on labor-saving weed management technologies—the rotary-hoe weeder in lowland rice and safe and efficient use of herbicides.

“With the rotary-hoe weeders, the weeding labor is reduced by up to 60─65% while the herbicides reduce it by over 80%. However, farmers do not always use the herbicides correctly and this can impact negatively on their health and the environment, hence the need for the videos,” Rodenburg said.

The videos shall be translated into four languages and distributed to at least 10,000 farmers and extension workers from the rice-growing areas in sub-Saharan Africa.


The main project partners were AfricaRice, Sokoine University of Agriculture (SUA), University of Dar es Salaam, Intermech Engineering Ltd, NAFAKA (ACDI-VOCA project on Tanzania Staples Value Chain), Kilombero Agricultural Training and Research Institute (KATRIN), Mbeya Agricultural Training Institute (MATI-Igurusi),  Kilimanjaro Agricultural Training Center (KATC), Centre for Agricultural Mechanization and Rural Technology (CAMARTEC), the Ministry of Agriculture, Food Security and Cooperatives (MAFC), IITA, and the World Vegetable Center (AVRDC).


Irmgard Hoeschle-Zeledon (PhD), Coordinator, IITA-led project Africa RISING.


The work presented here has been funded by USAID through the IITA-led project Africa RISING.

Related Link