Manual for Improving Rice Production in Africa
In Western African countries such as Nigeria and Ghana, a particular way of rice cultivation called the “Sawah” system, is being practiced on some rice fields. The “Sawah” system is technically defined as rice cultivation on a bunded, (i.e. leveed or embanked) well-leveled rice field with an inlet for irrigation and an outlet for drainage. Based on observations, the system reported remarkable results comparable to traditional rice cultivation (i.e. on rice paddies without levees).
JIRCAS saw the need to develop the inland-valley areas where grass-roots support can be readily harnessed and developed for the local farmers to become skilled practitioners of the “Sawah” system. JIRCAS started the study through the Development of Improved Infrastructure and Technologies for Rice Production in Africa (DIITRPA) program in 2008, with financial support provided by the Ministry of Agriculture, Forestry and Fisheries (MAFF) of Japan. The project was carried out by doing the following: (a) manual construction of the levee or embankment, (b) leveling the land using a power tiller, and (c) delivering irrigation water through manmade canals.
As one of the outputs of the study, JIRCAS published a technical manual, an index of which is listed on Table 1. It includes many findings acquired through four years of validation studies in Ghana and Ethiopia, including: (a) site selection, (b) organizing farmers' groups, (c) appropriate use of power-tiller or oxen (Fig. 1), (d) constructing small-scale irrigation facilities, irrigation canals and levees, (e) leveling, puddling and transplanting (Fig. 2), (f) adequate weeding and fertilizer application, and (g) post-harvesting techniques, among others.
On JIRCAS’ recommendation, many charts and illustrations were used to make the manual easier to comprehend and help the target readers, particularly extension officials (EOs) and farmers, digest the contents easily. Any rice producer who uses the manual is expected to easily understand the steps to undertake on the first year and the following years (Fig. 3). Usually, the first year is most crucial as it is the time when land is initially developed for rice cultivation, with lighter work expected for the succeeding years.
Some difficulties were encountered during validation studies in Ghana due to the area's natural conditions (i.e. topography and precipitation). To address the issue, JIRCAS recommended and shared the cost of constructing canals on a case-to-case basis to enable conveyance of irrigation water to the field. The availability of several types of irrigation facilities such as: (1) dike and weir type, (2) canal type and (3) water-harvesting type in the capital city of Kumasi in the Ashanti Region allowed the study to overcome such difficulties. The validation studies showed that the proposed techniques are effective on paddy fields of bunded and leveled conditions similar to the traditionally-practiced paddy fields in Japan.
In addition, a guide for rehabilitating constructed irrigation facilities such as weirs and canals was also included in the technical manual for the first time - an invaluable information that was never contained in previous manuals .
JIRCAS recognized the importance to have the manual published in local language in order to reach the most number of its intended users. The first draft was compiled in 2009 and delivered to EOs as well as farmers within JIRCAS experimental plots to solicit comments and suggestions. The draft manual was then revised after further consultation with government officers, EOs and researchers. Current version can be retrieved from the following URL.
Manual for Improving Rice Production in Africa
In Ashanti Region, Ghana where the validation study by JIRCAS was conducted, some farmers have already enjoyed a twofold increase of rice yield to 4.2 ton/ha whereas traditional practice produced only 2.0 ton/ha (based on the Afari site, as reported by the Ministry of Food and Agriculture). Similar achievement can be expected in rain-fed inland valleys in Africa (around 4.5 million hectares, according to estimates by the Coalition for African Rice Development or CARD) if farmers practice rice cultivation with the aid of the manual.
The role of EOs is very important as they could serve as catalysts in achieving the goal of increasing rice yield through effective transfer of technological information to the farmers. Thus, enhancing their roles and getting them more involved would be greatly beneficial to the program. Mechanization, however, is not as easily achievable in the short term (i.e. within the next few years) because power tillers are operated continually in a particular site and these machines require regular maintenance. Maintenance of these machines entail procurement of spare parts that may not be readily available, not to mention the need to have a standby mechanic and blacksmith for occasional repairs.
Rural Development Division, Japan International Research Center for Agricultural Sciences
FY 2011 （FY 2008-FY 2011）
- MIERUKA ID:001745
- MIERUKA ID:001803
Naoya FUJIMOTO et al. (2012): Manual for Improving Rice Production in Africa http://www.jircas.affrc.go.jp/english/manual/ricemanual2012/ricemanual2012_index.html