Jonathan Muriuki

Innovation in input supply systems in smallholder agroforestry: seed sources, supply chains and support systems

Institutional innovation in providing inputs and services is a central element for smallholder development. Agroforestry is an important income generating activity for millions of smallholders in the tropics, yet access to quality planting material—germplasm—of valuable tree species remains a major hurdle for improving farm productivity. We discuss requirements and possibilities for institutional innovation in developing more efficient delivery systems for tree germplasm as one aspect of improved input supply. We describe a simple model for delivery to farmers that identifies the major types of germplasm sources and discuss how this model can be used to identify relevant interventions to address bottlenecks in current systems. Our analysis leads to eight input supply configurations for smallholder agroforestry, typified by three major models. Lessons from the evolution of smallholder crop seed delivery systems can be applied to tree germplasm supply and indicate that a commercial, decentralised model holds most promise for sustainability. However, current emphasis in agroforestry on government and NGO models of delivery hinder the development of this approach. The application of prevailing classification approaches may also create a barrier to the development of appropriate supply systems that effectively service smallholders. An important implication of our analysis is that current actors in agroforestry input supply systems must redefine their roles in order for effective delivery to take place. We chose a case study from Kenya to illustrate our points.

Tree Seed and Seedling Supply Systems: A Review of the Asia, Africa and Latin America Models

The paper reviews tree seed and seedling supply systems in sub-Saharan Africa, Asia and Latin America. Across these regions, the review found that some of the germplasm supply systems do not efficiently meet farmers’ demands and environmental expectations in terms of productivity, species and genetic diversity. In some countries, germplasm used is mostly sourced from undocumented sources and often untested. Germplasm quality control systems are only found in a few countries. Appreciation of the value of tree germplasm of high genetic quality is low. Non-government organisations (NGOs) in many African countries play a prominent role in the supply of germplasm which is usually given to farmers without charge. The practice of giving farmers free germplasm by NGOs in many African countries and also government participation in germplasm supply in some Asian countries has been blamed for crowding out private entrepreneurs, although this is not substantiated by any evidence to suggest that the smallholder farmers are willing and able to pay for the germplasm. In some Latin American countries, private companies, government and NGOs provide farmers tree germplasm in a partnership in which farmers provide land and labour in return. Overall, tree germplasm markets are large in Asia, due in part to large afforestation programs, intermediate in Latin America and small in Africa where smallholder farmers constitute the market. In countries where germplasm quality control is practiced, it is either through a legal framework or voluntary. A few countries in Africa, Asia and Latin America have developed protocols for certification of tree seeds based on the OECD. Some germplasm suppliers use branding as a way of differentiating their germplasm as having superior quality. To enhance the use of high quality germplasm, there is a need to demonstrate the value of using such germplasm and raise awareness of germplasm quality among the farmers and policy-makers.

Formalisation of local herbal product markets has potential to stimulate cultivation of medicinal plants by smallholder farmers in Kenya

Trade in medicinal tree products is rising in urban centres of the developing world, posing a threat to biodiversity. Cultivation of medicinal plants is a viable alternative source of raw materials, but evidence on whether traders are willing to source from farms is lacking. In this study, it was assumed that an increase in consumer awareness would stimulate the creation and growth of formal enterprises dealing in herbal medicine, through demand for medicinal products that are better packaged and labelled as compared to openly sold plant parts. The study sought to establish whether medicinal plant traders in Kenya sourced raw materials from smallholder farmers and whether there was potential to raise cultivation levels of medicinal trees by smallholders with increased formalisation of enterprises. The study interviewed 55 herbal medicine enterprises classified as herbal clinics, final product enterprises, and herbal semiprocessing enterprises in four major cities of Kenya and 200 farmers in an area close to Mt. Kenya, where trees are in abundance on the farms there. The enterprises in the final products category were more recent, were the fastest growing, and sourced raw materials mostly from farms through purchasing. Most farmers in our study were not aware of opportunities to sell medicinal plant products, but those who sold products from other tree categories responded by planting more of those trees. Policies that facilitate herbal enterprises to buy more from farmer groups as well as economic analysis of the best candidate medicinal tree species for cultivation as alternative crops are recommended.

Tree nursery and seed procurement characteristics influence on seedling quality in Oromia, Ethiopia

Abstract Most tree nurseries in Ethiopia overemphasize mass seedling production to the expense of seedling quality. The study aimed at evaluating nursery characteristics and tree seed procurement approaches, and how these influenced seedling quality in eight purposively selected Woredas of Oromia region. A total of 169 respondents from government and non-government organizations, farmer nursery owners and development/extension agents and officers were interviewed. Seed quality was explored through assessing the seed supply sources, the type of seed source and mother tree selection, and the practices in seed physiological quality assessments. Our results revealed that over half (62.5%) of the nurseries were government owned, while 20% were NGO-run nurseries and the remaining 17.5% were owned by farmers. Nine challenges constraining tree seedling production and leading to underperformance were identified, with the two major problems shared by all nursery types being lack of sufficient material and germplasm input and using seeds of low or unknown quality. Informal seed dealers were the main source of seeds (87.6%) for all the nursery types. On the other hand, nursery operator’s own seed collection was from any free-standing trees either planted or retained as these sources were easily accessible. Seeds were, on average, collected from few mother trees, implying a high probability of sourcing seeds of narrow genetic diversity. Analysis of variance revealed statistically significant differences in seedling germination among the different seed procurement approaches within the same seed type. The seeds obtained from formal seed dealers had the highest germination rates in both hard-coated (87.3%) and soft-coated (79.7%) seeds. Our findings suggest that there is need to improve the seed procurement and the seedling supply system through quality assurance of the seeds used in seedling production.

Does strengthening technical capacity of smallholder farmers enhance adoption of conservation practices? The case of conservation agriculture with trees in Kenya

Despite decades of agricultural extension programmes, participatory research projects and efforts to encourage knowledge integration and sharing, few smallholder farmers are adopting natural resource management (NRM) practices. Using an agroforestry (AF)-based conservation practice known as conservation agriculture with trees as a case study, this study aims at contributing to the growing debate that a properly designed training programme enhances adoption of knowledge intensive NRM practices by providing resource poor farmers with the opportunity to learn, test and adapt such practices to suit their resource needs. To control for endogeneity in participation in training and assess the effect of training on adoption, we estimate an instrumental variable probit model using cross sectional data collected in 2013 from 198 farm households in Machakos district in Kenya. One key message emanating from the study, which is critical for development practitioners who are keen on up-scaling AF based conservation practices through training, is that strengthening technical capacity of smallholder farmers is necessary but it is not in itself sufficient to stimulate adoption of conservation practices. Instead, institutional factors like good road infrastructure that help reduce transaction costs associated with the search for information on technologies and markets and resource endowments in form of labour and land provide synergistic effects. Consequently, complementary strategies such as the introduction of cost effective labour saving technologies and the provision of enabling environment through public–private partnerships for farmers to access the technologies and inputs that are critical for implementing the skills acquired during the training are prerequisites for adoption.

Constraints encountered by nursery operators in establishing agroforestry tree nurseries in Burundi

A nursery operator survey was conducted to identify major constraints encountered by nursery operators for tree nursery establishment in Burundi. The survey covered two main contrasting agro-ecological zones of the country in Muruta commune and Bugesera region in Bugabira and Busoni communes. It was found that most planting materials used by nursery operators were collected from sources of unknown genetic quality. It was also noted that few tree species were raised in nurseries of Muruta and Bugesera areas. The growing medium used in individual and group nurseries was of low quality. The lack of capital and nursery material inputs was another impediment to small-scale nursery sustainability. Most nursery operators lacked sufficient technical knowledge on nursery establishment techniques and had limited skills on vegetative propagation techniques. The low involvement of non-governmental organizations and government agencies impedes the sustainability of nursery operations in the two areas of study. Finally, the low demand and price for tree seedlings do not motivate nursery operators to produce seedlings for income generation. The government intervention may develop a well-structured nursery management system to support sustainable production of high-quality seedlings. It is then necessary to organize trainings of nursery operators on source and collection techniques of germplasm or planting material. The establishment of seed orchards and seed production areas of a large number of tree species is also of great importance. The support of nursery operators in financial and material inputs may promote tree species diversity and increase seedling production. The link of tree operators to good market may improve the sustainability of tree nursery operations.

Households’ Choices of Fuelwood Sources: Implications for Agroforestry Interventions in the Southern Highlands of Tanzania

Fuelwood is the main source of energy for various household uses in many developing countries; and management of tree resources where it is obtained can be best undertaken when household choice patterns are understood. In this paper, households’ decision to obtain fuelwood for domestic consumption as influenced by household and fuelwood source characteristics is analyzed using a multinomial probit regression model. Data is obtained from 254 randomly selected household drawn from Mbarali district, south-western Tanzania. Results indicate that households are heavily dependent on natural forests for household energy provision and that the choice to obtain fuelwood from the forest, farm or market depends, among other factors on the availability of preferred fuelwood tree species at these sources. Acacia tortilis, Brachystegia spp. and Faidherbia albida are the significantly preferred tree species and hence affect the decision of where to obtain fuelwood. This revelation highlights the pressure applied to surrounding forests as well as to the aforementioned tree species which require immediate management interventions. The gender of the household head and whether the household lives in peri-urban or rural areas also influence choice of fuelwood source. Promotion of tree planting and on-farm management of tree species similar to preferred species found in natural forests is recommended. To the extent that consumer preferences are likely to change over time, further research using panel datasets is necessary to unravel inter-temporal preferences for fuelwood sources.

Variations in shoot and root growth of three provenances of Faidherbia albida in clay and sand soil

The variation in shoot and root seedling growth traits was compared among three Faidherbia albida (Del). A. Chev. provenances originating from Kenya (Taveta), Malawi (Bolero) and Ghana (Bolgatanga); representing east, south and west Africa, respectively. Bulked seeds from three provenances were grown in two soil types (clay and sand) at the World Agroforestry Centre nursery, Nairobi. Seedlings grown in clay soil had high shoot growth and shoot to root ratios but shorter root length, lower number of nodules and specific root length compared to seedlings in sand soil. Shoot to root ratios reduced with time and this was more pronounced in sand soil. Overall, the Bolero and Taveta provenances had higher growth than the Bolgatanga provenance. This was probably because plants grown in nutrient-rich clay soil invest more in shoot growth as compared to root growth. Longer root growth in sand soil shows a better adaptive mechanism that increases competitive ability and survival in nutrient-poor systems. Variations observed among the seedling variables such us shoot and root growth could be used for early selection for reforestation and agroforestry in predominantly clay and sand soil areas.

Variation in the response of eastern and southern Africa provenances of Faidherbia albida (Delile A. Chev) seedlings to water supply: A greenhouse experiment

Rural communities value Faidherbia albida in farming systems and pastoralism. Faidherbia albida provides products such as medicine, fodder, fuel, wood, food and services such as shade, soil fertility and nutrient cycling. Excessive browsing by animals, branch lopping and pod harvesting, have critically reduced the natural regeneration in some areas which exposes it to challenges due to dependence upon natural regeneration. The objective of this research was to evaluate response of Faidherbia albida provenances from eastern (Taveta Wangingombe) and southern Africa (Lupaso, Kuiseb Manapools) to different watering regimes to aid in selection of provenances for domestication. The observed difference in growth was analyzed to determine whether they are genetic or environmentally induced. Genotype × interaction were significant at (p≤0.001, p≤0.05) in seedling height, diameter and leaf numbers. Seedling height (r=0.94 p=0.001) recorded the highest correlation coefficient among all the growth variables analyzed. The growth variation was greater for seedling height than that of diameter and leaf numbers (h2=0.97). Hierarchical cluster analysis grouped the provenances into three clusters with cluster iii consisting of Taveta, Kuiseb and Lupaso while cluster ii and i composed of Wangingombe and Manapools respectively. Manapools recorded the highest genetic distance from Taveta, Kuiseb and Lupaso at 84.55 units. Wangingombe and Manapools are closely related genetically at a distance of 7.32. The maximum inter-cluster distance between cluster i and iii indicated wider genetic diversity between the provenances in these clusters and selection should be from this clusters for hybridization program to achieve novel breeds.

Testing Biodegradable Seedling Containers as an Alternative for Polythene Tubes in Tropical Small-Scale Tree Nurseries

Polythene tubes are the most commonly used seedling containers and their adoption can be attributed to high water retention that enhances seedling establishment as well as the desire for low-cost readily-available containers by nursery operators. Polythene tubes have drawbacks, however, because they adversely affect seedling root growth and are an environmental hazard. This study was conducted in Meru, Eastern Kenya, to investigate whether small-scale tree nursery operators are likely to adopt biodegradable seedling containers (cellulose papers and banana sheaths). It was hypothesised that biodegradable containers are better for seedling growth and are more environmental friendly than the widely used polythene bags. The study assessed the frequency of watering and growth (height and basal diameter) of Calliandra calothyrsus seedlings produced in various biodegradable containers under three conditions with varying watering requirements, i.e. light tree shade, shade net and polythene chambers, the first being widely used by farmers. The performance of these seedlings was later monitored in the field. Seedlings produced in biodegradable containers required more frequent watering than those in polythene bags under light tree shade and shade nets but less frequent in polythene chambers. Seedlings produced in polythene tubes had higher growth rates in the nursery, but when transplanted to the field, they were overtaken by those grown in the biodegradable containers due to transplanting shock after the polythene containers were removed. Biodegradable seedling containers can therefore be adopted in areas where water is not very limiting, and evaporation rates could be reduced and water-use efficiency improved by raising seedlings in simple polythene structures.