On-Farm Demonstration of Improved Rice (Oryza sativa L) Varieties in Pawe District of Benshangul Gumuz Regional State, Ethiopia

The research is financed by Ethiopian Institute of Agricultural Research Abstract Four varieties (Hidasie, Nerica-12, Nerica-4 and Pawe-1) were demonstrated and evaluated on a farmer’s field. Average yield performances of the demonstrated varieties show 42.66, 34.19, 33.41 and 32.23 quintal per hectare of Pawe-1, Nerica-3, Hidasie and Nerica-12 varieties respectively. Pawe-1 variety showed better yield performance. In the ranking, Pawe-1 was selected as the best-preferred. Based on farmers’ perception, Pawe-1 was ranked first as it produces a good yield, high tilling capacity, the white colour of the grain and preferred at the market with good price. This result indicates Pawe-1 variety is farmers’ best preferred and top performed variety which can be considered as a promising variety to be widely produced by rice farmers in the study area. The yield under demonstration plots was higher than the local cultivar and the use of research recommended rice cultivation method can reduce the technology gap to a considerable extent. Therefore, it is recommended that the office of agriculture of the woreda needs further scale up the varieties to other areas to benefit quite a significant number of farmers. Keywords: Demonstration, evaluation, Pawe, rice, varieties. DOI : 10.7176/JBAH/10-1-07 Publication date: January 31 st 2020


Introduction
In Ethiopia, agriculture is the leading sector which contributes to nearly 34. 9% of GDP It also serves as the main source of food and generates 88.8% of the foreign exchange earnings. Crop productions contribute the lion share to the Ethiopia's agriculture and economy (NBE, 2018). About 80.6 % of the total population live in rural areas and earn their livelihood from agriculture. Nearly 55% of all smallholder farmers operate on one hectare or less (MoARD, 2010).  (PDoA, 2014(PDoA, /15-2018), the total land used for rice production and total yield over the period is increasing. This shows even if the rice has been recently introduced to the area, recognizing its importance as a food security crop and a source of income, the area coverage and production increasing but the productivity is low compared with the potentials of research released varieties for the study area.
Pawe agricultural research center in collaboration to other sister research centers adapted and released several high-yielding and disease-resistant rice varieties together with their associated improved agronomic practices (EIAR, 2016). Demonstration and evaluation of these varieties in the farmers' field are vital, to promote the newly released varieties and evaluate them under farmers condition. Seed replacement with improved varieties is also an important tool to enhance the productivity of rice growers (Yalamalle and Tomer, 2019). Hence, with these in view, the study was carried out to show the performance of recently released rice varieties with their agronomic recommendations and select and recommend the best-fit variety based on farmer's selection criteria for future technology scaling-ups.

Description of the Study Area
The demonstration was conducted in Pawe district which is one of the districts in the Benishangul Gumuz regional State ( Figure 1). It is located geographically between 36°20'-36° 32' longitude and 11°12'-11°21' latitude with an altitude of 1120 mean average see level. The district has 20 kebeles and the climate of the area is hot humid and characterized by unimodal rainfall pattern with high and torrential rainfall that exceeds from May to October. The area experiences a temperature ranging from 19.4°C to 37.6°C with a mean annual rainfall of 1586 mm. The district covers a total area of 63,400 hectares. The farming system of the district is characterized by a mixed croplivestock farming system dominated by crop production. The major crops grown in the district include; maize, finger millet, soybean, sesame, groundnut and rice (PDoA, 2018).

Farmers Selection and Field Establishment
In consultation with district agricultural experts, farmers who have an interest in the technology, willingness to manage and allocate field for the demonstration and willingness to collaborate with extension agents and researchers were selected for hosting the demonstration. Twenty farmers were selected and the demonstrations were established in a farmer's field were each farmer considered as a replication. For the demonstration, full technology packages of rice were provided. The varieties were planted in 0.25 hectares in each demonstration host farmers' field. Hidasie, Pawe-1, Nerica-12, and Nerica-3 varieties that have been released from the research were grown side by side to demonstrate and compare their performance with the one that farmers are using (local cultivar). Before the establishment of the demonstration or planting the seeds, both practical and theoretical training was provided on the improved rice technology from production to marketing.
In the demonstration plots, farmers used a row spacing of 20 cm within rows and15-20cm space between plants and 80 kg/ha seed rate. Fertilizer application, insect pest control, and other necessary practices were applied as per the rice production package (EIAR, 2016). The date of planting was maintained the same for all varieties. Follow-ups and essential advice from respective researchers and agricultural experts have been given to demonstration host farmers. During each visit, discussions were made with the farmers and DAs right on the demonstration plot to jointly evaluate the performance of the varieties on the field. During the visit, both farmer's and development agent's data recording format were checked to observe how they handled the information gathering process.

Data Collection and Analysis
The activity data were collected by the researchers directly from the field. Farmer's perception of the varieties was recorded from focus group discussion during the evaluation process. The collected data were analyzed using descriptive statistics and preference ranking based on farmers' set criteria. Finally, the extension gap, technology gap, technology index along with the benefit-cost ratio were worked out. The technology gap shows the gap in the demonstration yield over potential yield. The observed technology gap is attributed to dissimilarities in soil fertility, salinity and erratic rainfall and another variability of weather conditions and used to provide location-specific recommendations (Samui et al., 2000). Technology Gap = Potential yield -Demonstration yield Extension Gap = Demonstration yield -Farmer yield

Training of farmers and other stakeholders
Training on rice production and management practices were given to demonstration host farmers (twenty) and development agents (four) who were working in the study site. This includes both theoretical and practical types of training. During regular visits, there were gaps identified by researchers. To fill the observed gap, field-level training was given by organizing farmers into small groups.

Yield Performance
For the study period from demonstration plots, yield data were collected from twenty farmer's field. Grain yield comparison between improved varieties (Hidasie, Nerica-12, Nerica-3 and Pawe-1) and local cultivar was made.
Journal of Natural Sciences Research www.iiste.org ISSN 2224-3186 (Paper) ISSN 2225-0921 (Online) Vol.10, No.7, 2020 16 The result obtained from the demonstration in the study area is described in Table 1.
As it is described in Table 1, average grain yield of 33.41, 32.23, 34.19 and 42.66 quintals per hectare were obtained from the improved rice varieties Hidasie, Nerica-12, Nerica-3 and Pawe-1 respectively, while the average grain yield of local cultivar was 28 quintal per hectare. This implies, the research released varieties gave a higher yield than the local cultivar in the study area. Similar yield results were also obtained by Hailegebriel et al., (2017) which was about 34.30 qt/ha for Hidassie, 35.73 qt/ha for Nerica-12 and 35.17 qt/ha for Nerica-3 variety in Tselemt district of Tigray regional state. The result also conforms with (EIAR, 2016) and suggests the positive effects of demonstrations over the existing farmers practice towards enhancing the yield of rice with its positive effect on yield attributes.

Yield gap and Advantage
The highest yield increment (14.66 qt/ha) was recorded by Pawe-1 variety of a 52. 36 % yield advantage over the local cultivar. Comparing with the local cultivar, all varieties have a yield advantage and yield increments; Hidasie (5.41 qt/ha) and, Nerica-12 (4.23 qt/ha) and Nerica-3 (6.19 qt/ha). This result was in consistent to those of Wubale et al., (2019) and Alemayehu (2017) who observed similar grain yield difference among the improved varieties of rice.
The difference in yield between the demonstrations and potential yields of the varieties was also well noted (Table-2). The technology gap showed the difference between demonstration yields and potential yield. The highest gap was found in Nerica-3 variety (10.81 qt/ha) and the minimum difference found with Pawe-1 variety (2.34 qt/ha). The difference in the yield result from the demonstration field confirms the productivity of rice varieties registration (EIAR, 2016). The technology gap could also be because of varying soil fertility, rainfall and unpredictable weather conditions. Generally, the varieties demonstrated yielded better to that of the control/ farmers practice. From the demonstration result, it can be concluded that the adoption of high yielding improved varieties can result in improved productivity and food security.

Rice farmers considered varietal traits and ranking
Farmers have their preference criteria to accept and use a specific variety or technology (Semagn et al., 2017). The finding of this study suggests that farmers in the area seek specific varietal traits, such as yield potential, tolerance to diseases better price and color. The farmers' perceptions of improved rice varieties specific characteristics significantly limit the acceptance and decisions to use the specific technology (Hailemariam, 2016). Therefore, the research centers have to give more attention to participatory research which considers farmers' priorities and needs.
Overall varietal traits and farmers preference of rice varieties categorized largely in terms of grain color, grain yield, marketability, pest/ disease resistance, maturity, bio-mass as discussed briefly below. The varieties were evaluated at crop maturity stage by a group of rice grower farmers. During preference ranking, selected farmers were asked to set their priority selection criteria. Selection criteria of farmers in the study area were based on an extensive discussion and agreement. The criteria were; Marketability, grain yield, grain color, seed size, maturity and tilling capacity.
Farmers who can represent the kebeles and who have long experience in rice farming were selected and participated in the evaluation of the demonstration plots/ varieties. In the preference ranking, Pawe-1 was the bestpreferred variety than the others in the demonstration.   2  2  3  1  3  3  14  2nd  Nerica -12  1  1  1  4  2  2  11  4rd  Nerica -3  3  3  2  2  1  1  12 3th NB: preference ranking scale 1-4 (4= highest score/preferred and 1= lowest score/preferred) As indicated in the Table 3, Pawe-1 is farmers' best preferred and top performed variety which can be considered as a promising variety to be widely produced by rice farmers in the study area. Based on farmers' perception, Pawe-1 variety was ranked first as it produces a good yield, white grain color, preferred at the market with good price. Farmers also reported that during the focus group discussion, Nerica-3 variety was early maturing but susceptible to bird attack in addition to the lower yield potential. It may be important to note at this point that proper practices are also potential factors for differences in yield (Table 3).

Conclusion and Recommendations
From the findings of this research, it was observed that there was a difference among the varieties used for the demonstration in the study area. Hence, Pawe-1 was found as the best rice variety as it produces a higher yield than Nerica-3, Nerica-12 and Hidasie varieties. Similarly, farmers also show their preference to Pawe-1 and Hidasie than Nerica-12 and Nerica-3 varieties based on good yield, white grain colour, preference at the market places in addition to its productivity. The yield under demonstration plots was higher than the local cultivar and reduce the technology gap to a considerable extent. Therefore, it is recommended that the office of agriculture of the district needs further scale up the varieties to other areas to benefit quite a significant number of farmers.