Potential for Sustainable Mountain Farming: Challenges and Prospects for Sustainable Smallholder Farming in the Maloti–Drakensberg Mountains

Achieving sustainable food security is a critical goal for smallholder farmers in mountainous regions around the world. In the 40,000 km2 Maloti–Drakensberg mountains (South Africa and Lesotho), one of the important mountain ranges of southern Africa, farmers are directly dependent on natural resources. Natural resource management is currently unsustainable, driving landscape degradation and entrenching poverty cycles. Through a comprehensive literature review, we explore the current status of knowledge, opportunities, and agriculture-dependent natural resource sustainability in the Maloti–Drakensberg, and outline the priorities for future research in mountain agriculture in southern Africa. The Maloti–Drakensberg has diverse land tenure systems and climatic heterogeneity that together determine farming practices. Agropastoralism is the predominant agricultural practice, occupying 79% of the land, because of the natural grass-dominated vegetation. Despite decades of concern, the sustainable management of communal rangeland remains elusive. Arable cropping is practiced on 12% of the land at subsistence levels, while game farming contributes a small amount to local revenues. A multipronged research approach is needed to understand the complex social–ecological issues around soil degradation and sustainable utilization of the limited agricultural natural resources base. Innovative and adaptive strategies that take into account local and indigenous knowledge, mitigate soil degradation, and enhance water and rangeland conservation are needed to promote sustainable food production in the Maloti–Drakensberg.


Introduction
Shifts in population dynamics, population growth, and climate change are predicted to put greater constraints on global food production before the year 2050 (FAO et al 2013; Kohler et al 2014). Higher food productivity requires greater diversification of rural farming systems, especially on marginalized lands, such as those in mountainous areas (FAO 2015a;Sibhatu and Qaim 2017). Land use policies, agricultural practice, and climate change affect the endemic biota. Utilizing biotic interactions to provide desired services in mountain ecosystems could enhance ecologically sound agriculture and influence the livelihoods of mountain dwellers (K€ orner and Ohsawa 2005;Shennan 2008).
The mountainous environments of eastern and western Africa are densely populated because of their favorable natural conditions for agriculture. Here, cropping systems are more dominant than livestock ranching (Wymann von Dach et al 2013; East African Community et al 2016). In contrast, agropastoralism is the dominant land use in the phenology, reducing pasture in the region. The anticipated climatic changes could be mitigated by developing adaptation strategies, such as the adoption of agricultural practices and technologies that increase the resilience of mountain livelihoods.
The Maloti-Drakensberg mountain bioregion is of global importance and a prime catchment mountain range in southern Africa because of its cultural-social value. It is a center of biological endemism and diversity of plant species, and acts as a primary water tower for Lesotho and South Africa (Brand et al 2019). The people of the Maloti-Drakensberg (.2 million) depend partly or completely on the natural resources for their livelihoods. Household food insecurity is high because of low incomes, high unemployment rates, high food expenditure, large household sizes, limited access to land, and vulnerability to economic shocks (Lawes et al 2007;Wittmayer and B€ uscher 2010;Chakona 2017;Carbutt 2019). Involvement in agricultural activities is on a subsistence level to supplement food purchases (Davids 2006). Chakona (2017) reported the estimated average income of the poor was less than ZAR 524 (US$ 30.90) per person per month in 2012 and the purchase of food accounted for 60-80% of total household expenditure. The population derived benefits from utilizing and selling products obtained from natural resources, mostly by harvesting the bark of trees for use in medicinal products, grass for the production of brooms and grass hats, and pastures for livestock grazing (Zondo 2016). However, the increasing human population and unsustainable rangeland activities in the Maloti-Drakensberg are gradually transforming the natural grassland environment, degrading the landscape, and making livestock farming a less viable option (Blignaut et al 2010;Carbutt 2019).
In order to achieve Sustainable Development Goals (SDGs) 2 and 15, which emphasize zero hunger and the need for sustainable, resilient food production (SDG target 2.4) as well as conservation of mountain ecosystems (SDG targets 15.1 and 15.4) (FAO 2019b), evidence-based institutional interventions are needed to promote sustainable mountain farming, food security, and sustainability in the Maloti-Drakensberg. Chikazunga and Paradza (2012) have shown that support for farming systems-such as government policies, financial aid, and technological innovations-in southern Africa is biased: more attention is given to lowland and nonmountainous agriculture, whereas mountain agriculture is often neglected.
Similarly, numerous studies on mountainous regions in other parts of Africa, especially in eastern Africa, have a strong focus on mountain agriculture (East African Community et al 2016; Yamane et al 2018). However, in southern Africa, this is a neglected topic, especially with regards to subsistence farming (Wymann von Dach et al 2013). The Maloti-Drakensberg farming systems include both privately owned commercial farming systems with technological resources and subsistence farming systems that largely depend on crude tools and family labor for production.
Balancing food security in the context of accelerating soil degradation, competing land uses, and climate change is the major challenge facing the Maloti-Drakensberg. The establishment of frameworks, methods, and processes that support viable sustainable agriculture is imperative to balance these conflicts (Khwidzhili and Worth 2016). The objective of this review paper is therefore to appraise the status of mountain farming in the Maloti-Drakensberg in terms of its challenges and opportunities for sustainable food production. The key focuses are as follows: The current status of the Maloti-Drakensberg smallholding agricultural system in terms of livestock and crop production; The potential gaps and priorities for future research in mountain agriculture in southern Africa.
Although this study focuses on the Maloti-Drakensberg, we believe that our findings are applicable to other mountain regions in southern African countries, since they have similar agroecological climates, natural resources, agrobiodiversity, and cultural values (Mabhaudhi et al 2017b).

Methods
The study is mainly based on a literature review. Publications containing quantitative and qualitative research findings were extracted using the following online databases: ISI Web of Science, Googlet, Google Scholart, Scopus, ScienceDirect, and SpringerLink. Considered publications comprised peer-reviewed papers as well as literature published by research institutions and government projects, such as the South African government gazettes, formal reports, working papers, and conference proceedings pertinent to mountain farming. The publication dates ranged from 1941 to September 2019. Based on the objectives of the study, the following search terms were used: ''mountain agriculture,'' ''agriculture in the alpine,'' ''hill cropping,'' ''terrace farming,'' ''family farming,'' ''marginalized farming,'' and ''underutilized farming.'' The title, abstract, and full text of articles selected (1547) were manually screened for relevance based on criteria defined by the objectives of the review. Our first choice was scientific articles dealing with the criteria within southern Africa. However, this yielded relatively little information on subsistence farming in mountains (,40 peer-reviewed articles were found). Hence, literature on other mountain regions in Asia and Europe with similar environmental conditions-such as similar elevational range, climatic conditions, and socioeconomic patterns-were also considered. Overall, 105 publications were critically reviewed, one by one, and relevant insights were categorized to build arguments for the following 2 groups: Maloti-Drakensberg current land use, based on local studies; and potential strategies to improve Maloti-Drakensberg agriculture, which were deduced from additional options developed in mountain farming in other countries with similar environmental conditions.

Results and discussion
Current land use in the Maloti-Drakensberg The Maloti-Drakensberg comprises a mosaic of land tenure that includes private and state land (Knight et al 2018). State land includes communal land tenure, protected areas, and state forestry, among others. However, communal land tenure is under the control of traditional authorities, such as the amaNgwane and amaZizi traditional councils. Land in the Maloti-Drakensberg includes cultivation land (12%), rangeland (79%), and land for ''other development'' (8%) (MDTP 2008(MDTP , 2015Shezi 2019). The communal land hosts subsistence agriculture, while commercial farming dominates the private land (Zunckel 2012). Subsistence farming relies predominantly on family labor and plays a major role in food security and poverty eradication (MDTP 2015;Rodrigues et al 2017). Blair et al (2018) indicated that land use in mountainous environments is based on cultural practices, behaviors, and the needs of the local communities. Farming in the Maloti-Drakensberg supports extensive livestock production (Cloete et al 2010), subsistence cropping, fishing, and game farming (Turpie et al 2007). Cropping practices are characterized by the production of cereal, cucurbits, pulses, oilseeds, fodder crops, vegetables, and natural growth of medicinal plants ( MDTP 2015). Most of these supplement food that is purchased for household food consumption (Davids 2006).
Rangeland grazing and livestock management: Owing to the rugged landscape, soil with high clay fractions, limiting macronutrients (nitrogen and phosphorus), low temperatures, increasing nutrient leaching, and mesic grassland cover in the Maloti-Drakensberg, the dominant land use is livestock farming, which contributes immensely to the socioeconomic growth of rural dwellers (Zunckel 2003;Carbutt and Edwards 2015). Almost 55% of smallholder farmers practice livestock farming with cattle, goats, and sheep, while approximately 25% of the farmers engage in cropping, and the remaining 20% are involved in other activities, such as hunting, cultivation of medicinal plants, and fishing (Elleboudt 2012;BFAP 2018). Beef cattle and dairy production are important to their livelihoods, whereas meat production from monogastric animals is less favored in the region (Elleboudt 2012). In southern Africa, communal livestock serve various purposes other than food; for example, draft power for plows and wagons, cultural value (such as marriage payments and in rituals), and a more stable investment than volatile national currencies (Ndoro and Hitayezu 2014).
Rangeland productivity depends on the grazing management of biotic (browsers, large and small stock) and abiotic (climate and lithology) components of the Drakensberg farming system (Hawkins 2017). Rangeland management in southern Africa comprises rotational grazing, zero grazing, or a combination of both, monitoring stocking rate, camp size, and recovery periods. However, no specific information on current grazing management is available in the unprotected areas of the Maloti-Drakensberg, which have been extremely stressed. Decades of overgrazing, especially in communal contexts, without effective rangeland governance have reduced the carrying capacity dramatically and is associated with widespread land degradation in the form of bush encroachment, soil erosion, and wetland loss (Brand et al 2019). Some areas of the Maloti-Drakensberg, such as around Mokhotlong in Lesotho, are now facing ecosystem collapse, with consequent negative impacts on water security, agrarian livelihoods, and social cohesion (Dunnink et al 2016;Brand et al 2019). Rangeland under commercial land use on private farms is generally in much better condition, contributing highly to water production and biodiversity conservation as de facto conservation areas (Zunckel 2003). The largest areas of private rangeland in the Maloti-Drakensberg are in the Eastern Cape areas, centered on the towns of Rhodes and Barkley East (Carbutt et al 2011).
Cropping system in the Maloti-Drakensberg: In comparison to other southern African mountain areas, the Maloti-Drakensberg experiences relatively high summer rainfall (.700 mm) and has fertile soils. This enables summer cropping of cereals, cucurbits, root and tuber crops (potatoes), legumes, oil crops (sunflower and soybeans), and fodder crops on the lower slopes and in the foothills (Zunckel 2003;Taylor et al 2016;Mukwada and Manatsa 2018). Maize is the main summer cereal crop, while winter sorghum, oats, and wheat are grown mainly as fodder crops in winter (Turpie et al 2007). The broad acceptability of maize is due to the wide adaptability of the crop to varying environmental conditions (Arnalte 2009;Akinnuoye-Adelabu et al 2017). Currently, crop farming in the Maloti-Drakensberg takes the form of subsistence farming with relatively little government support (Zunckel 2003) ( Figure 2). Intercropping and crop rotation are 2 of Maloti-Drakensberg farmers' many livelihood strategies to cope with the fragile mountain ecosystems, safeguard food supply, and meet the dietary requirements of households (Carbutt and Edwards 2015;De Wit et al 2015) in low-temperature and soil macronutrient-limited agroenvironments (Mukwada and Manatsa 2018).
Game farming: Small-scale farmers in the Maloti-Drakensberg experience various sources of uncertainty in their farming practices. These are caused by complex, dynamic, and interrelated factors, such as livestock theft, climate change, the withdrawal of subsidies, changes in labor relations, and instability in produce prices through global economic competition (Salomon 2011;. Uncertainty in the profitability of conventional livestock farming has made some farmers switch to game farming; the rationale is that indigenous wildlife is better adapted to the local climatic conditions than livestock and is therefore easier to farm (Mahlobo 2016). Game farming is the management of indigenous wildlife (usually larger mammals, such as antelope) in a sizable fenced system, with human intervention through provision of water, supplementation of food in periods of drought, the control of parasites, and the provision of health care (Porter 2016).
Although game farming is usually the domain of wealthier private landowners, some communities under tribal authority are also considering this as an alternative to communal livestock (MDTP 2015). For both private and communal game farming, the benefits of wildlife-based enterprises cascade into leisure and ecotourism, trophy hunting, game auctions, and other activities with a high financial return, creating 3 times more employment opportunities than livestock (Rassool and Witz 1996;Shroyer and Blignaut 2003;Brooks et al 2011;Sert 2017). In South Africa, under favorable government policy and regulations, game farming accounts for 25% of the national gross domestic product (de Beer 2009).
Currently, there are approximately 180 game farms in eastern Free State, with an average farm size of 821 ha (Du Toit et al 2013), which focus on game capturing, selling, and hunting (Shroyer and Blignaut 2003). Typical species farmed are eland (Taurotragus oryx), blesbuck (Damaliscus pygargus phillipsi), springbuck (Antidorcas marsupialis), grey rhebok (Pelea capreolus), mountain reedbuck (Redunca fulvorufula), Burchell's zebra (Equus quagga burchellii), bushbuck (Tragelaphus sylvaticus), black (Connochaetes gnou) and blue wildebeest (Connochaetes taurinus), and red hartebeest (Alcelaphus buselaphus caama). Most of the Maloti-Drakensberg area is unsuitable for the reintroduction of larger mammals, such as elephant (Loxodonta spp), rhino (Rhinoceros spp), giraffe (Giraffa spp), and hippo (Hippopotamus spp), or for predators, such as lion (Panthera leo), though leopard (Panthera pardus) still occurs naturally in the Maloti-Drakensberg. Major challenges of game farming include limiting the natural movement of wildlife (the Maloti-Drakensberg historically has had major seasonal migrations between higher and lower elevations) and the introduction of genetic strains not indigenous to the Maloti-Drakensberg. These lead to the danger of stressing the animals through inadequate forage in winter months, overgrazing, and loss of local genetic identity among the remaining indigenous populations (Bond et al 2004). Fish farming: Fish farming is among the world's fastestgrowing sustainable food production industries (Godfray et al 2010). The Maloti-Drakensberg is one of the most waterabundant parts of southern Africa, with cool temperate waters in the form of natural rivers and streams, tarns, lakes, and artificial reservoirs of all sizes (from small farm impoundments to the Lesotho Highlands Water Scheme Dams, such as Katse and Mohale dams). Cool seasonal water temperatures (4-138C) and high mean annual precipitation (up to 2000 mm) are considered to be of primary importance in fish farming (Skelton 2000;Nel et al 2010). In the Maloti-Drakensberg, smallmouth yellowfish (Labeobarbus aeneus) and rainbow trout (Oncorhynchus mykiss) are among the main fish produced in hatcheries (Ellender and Weyl 2014). Although the freshwater fishing industry in South Africa is a high-risk economic sector, because of limited seasonal availability of freshwater sources, the government policy on licenses was set in place to help regulate the conservation of endemic and endangered fish species (notably the Maloti minnow, Pseudobarbus quathlambae), and restrict farming around wetlands to safeguard against water pollution. However, fish farming in South Africa is believed to have good future prospects because of its stable prices, growth in local market demand, and its relationship with steadily growing tourism (Stander 2009). This is promising for initiatives in the best farm locations, such as in the Maloti-Drakensberg, provided that good operational management prevails (FAO 2016).

Potential strategies to improve smallholder farming systems in the Maloti-Drakensberg
Management of communal rangeland, pasture, and cultivation lands in the Maloti-Drakensberg is complex because it is linked to local leadership and governance issues. It requires the cooperation of subsistence farmers on the communal land, traditional leaders, and communities (MDTP 2015).
Rejuvenating old terraced lands: There is scant information on terrace farming in the Maloti-Drakensberg and other southern African mountain areas. However, there is evidence of previous terrace farming in the Maloti-Drakensberg (Figure 3). The Machobane farming system adopted in the mountainous regions of Lesotho gives the cropping system high adaptability and resilience to climate change (Mekbib et al 2017). Most resource-poor farmers have no access to a scientific knowledge system; instead, they rely on their local and indigenous knowledge to sustain food production. Terrace farming is an indigenous practice, and is one of the most successful techniques for water and soil conservation on steep slopes in other mountainous areas in China, Peru, and southern Ethiopia (Denison and Wotshela 2009;Engdawork and Bork 2014;Chapagain and Raizada 2017). Gertenbach (1941) reported old practices of terrace farming, such as stacking stones parallel to hillside contours, for cropping purposes in the Drakensberg region of KwaZulu-Natal. Campbell et al (2014) indicated that stone terraces, when combined with other land management techniques, double the yield increase of sorghum and millet in the drylands of western Africa. Rejuvenating traditional terrace stone walls in the Maloti-Drakensberg could therefore help mitigate soil degradation (gully and sheet erosion) and promote soil water conservation techniques. A report by the World Overview of Conservation Approaches and Technologies (WOCAT 2007) indicated that soil erosion and degradation in other mountainous areas of the world have been mitigated through this practice.
Likewise, control measures, such as revegetation using vetiver grass (Chrysopogon zizanioides) and strict conservation tillage on semiarid mountainous farmland, help to mitigate erosion, as in other mountainous areas of South Africa and Asia (WOCAT 2007;Hilger et al 2013). However, the potential of terrace farming to increase food productivity needs to be carefully examined in the Maloti-Drakensberg (Hendriks et al 2016).
Reducing soil degradation: The Maloti-Drakensberg's ecosystems are dynamic and highly susceptible to climatic changes, accelerated soil erosion, and landslides, leading to rapid loss of habitats and genetic diversity, soil degradation, and reduction in soil water availability (Mukwada and Manatsa 2018). Extensive tillage-based cultivation and overgrazing have aggravated the problem (Meadows and Hoffman 2002). Free State province has a large area (.2 million ha) exposed to erosion, of which the Maloti-Drakensberg occupies a significant percentage (Le Roux and Smith 2014). The impoverishment of the soil causes greater vulnerability to droughts, increases difficulties in agricultural production, and modifies land-and water-based ecosystems. Attempts to deal with soil degradation caused by erosion in Maloti-Drakensberg farming systems need areaspecific management strategies that identify and map current erosion-prone areas and introduce measures to prevent the loss of vegetation cover. Farmers in the Maloti-Drakensberg have to harness potential that could be derived from soil conservation measures. Measures include cover crops, returning plant residues to the soil, crops with strong rooting systems that protect and improve soil resources, and rotational grazing management in Maloti-Drakensberg farming systems (Le Roux and Smith 2014). Given the limited scientific information on the processes and extent of soil degradation in the Maloti-Drakensberg, research should be increased to fill the knowledge gap and to identify adequate and place-specific conservation approaches and technologies and agronomic solutions to inform policies and regulation legislation.
Improving agronomic management through sustainable farming: The system of crop intensification could advance the productivity and resilience of crops by optimizing the benefits of available resources for improved plant growth and development (Adhikari et al 2018). Practices that return organic materials to the soil have been encouraged in mountainous regions of South America and Asia (Chapagain and Raizada 2017). However, residues applied to the aerated and porous soils of most mountainous regions could decompose rapidly and have no positive effect on the soil quality (FAO 2015b). Since the Maloti-Drakensberg still has moderate soil organic matter content (Mapeshoane 2013), returning organic plant parts to the soil could help protect against erosion and conserve soil biota. Soil conservation strategies include cultivation of deep-rooting plants on slopes up to 45% (Harden 2013). Further, soil amendment strategies such as vermiculture, improved trash lines, and addition of biochar should be encouraged in the Maloti-Drakensberg (Gobozi 2018). Agronomic practices, such as adjusting plant densities, relay planting, crop rotation, cover-crop management, and application of balanced organic and inorganic fertilizers (Table 1), would boost soil biota populations, increase diversity, and improve sustainable cropping in the Maloti-Drakensberg (Carbutt and Edwards 2015).
Embracing underutilized crops in the Maloti-Drakensberg: The Maloti-Drakensberg farming systems focus mainly on staple crop production, with very little cultivation of underutilized or indigenous crops (Zunckel 2003;Mabhaudhi et al 2017b). The few underutilized crops cultivated have fairly informal market arrangements, depending on local culture, tastes, and traditional knowledge (Mabhaudhi et al 2016). The current market value of underutilized crops is unknown (Gulzar and Minnaar 2017). Underutilized crops, such as buckwheat (Fagopyrum esculentum) and finger millet (Eleusine coracana), are not staples but have the potential to contribute to food security. They could enhance nutrition, health, income generation, and agroecological and environmental services through increased productivity, better marketing, and home consumption (Chivenge et al 2015).
Underutilized crops that could be adapted to Maloti-Drakensberg farming systems are listed in Table 2. They are less dependent on soil nutrients, resilient to climatic change, adaptable to low-input agriculture, and have a rich nutritional profile (Mabhaudhi et al 2017b). They thrive well and are better able to restore degraded and marginal lands than commercially grown crops, making them advantageous for sustainable cultivation (Gulzar and Minnaar 2017;Mabhaudhi et al 2017aMabhaudhi et al , 2017b. Thus, their promotion in marginal agricultural production areas, such as the Maloti-Drakensberg, could improve accessibility to nutritious foods. The crops have a wide genetic pool and provide an important subset of agrobiodiversity and genetic breeding possibilities (Mabhaudhi et al 2019), thus contributing to the Common challenges associated with Maloti-Drakensberg soils and potential solutions identified in similar contexts. The South African Department of Agriculture, Forestry and Fisheries (DAFF) has an important role to play at the policy level in promoting mountain agriculture (DAFF 2017). Currently, the food security policies guiding research, production, and marketing of agricultural produce from mountainous areas exert little influence over subsistence mountain food production. Specific policies on agricultural expansion, such as granting agricultural subsidies and minimum selling prices with regard to products from marginal land, are essential. Grassroots networking programs should be organized among mountainous subsistence farmers, such as the one-household-one-hectare program at Ficksburg in the eastern Free State of South Africa (OVK Retail Division 2019). This would improve the dissemination of important information that could increase food security in the nation.

Conclusion and recommendations
Agriculture in the Maloti-Drakensberg is dominated by communal tenure systems that require strategic interventions to improve productivity and address soil degradation. Given the complexities of the challenges, the following situations and policy intervention are required: Adaptive strategies that focus on soil and water conservation through resilient cropping practices using underutilized crops that require low farming inputs and are indigenous to the landscape. Sustainable grazing management could also help boost food security in the area. All forms of local and indigenous knowledge used by the local farmers in the Maloti-Drakensberg should be encouraged and assessed, through agricultural advisory services and technical interventions within the mountain communities.
Measures that enhance effective rangeland and pastureland governance by monitoring livestock carrying capacity in unprotected areas of the Maloti-Drakensberg should be put in place by the government. Training programs on sustainable food production, conservation, and sustainable utilization and benefits of healthy natural ecosystems should be organized by research institutions, thereby educating Maloti-Drakensberg farmers on ways to sustainably farm within the fragile mountain ecosystems. Area-specific management strategies that identify and map current erosion-prone areas should be developed and measures to conserve vegetation cover introduced. Broadscale control strategies to prevent further gully erosion may be expensive and more difficult to attain in severely eroded areas. However, control measures like revegetation, conservative agriculture, and restoration of traditional terrace stone walls would help mitigate the soil degradation.
A transboundary research effort that incorporates social and cultural nuances is needed in the Maloti-Drakensberg. The results of this could be used to develop agronomic solutions and formulate legislation. This will require organizing grassroots networking programs among the stakeholders concerned (nongovernmental organizations, faith-based groups, institutions, agroindustries, and aid organizations). Measures such as smallholding features and smart agriculture and intervention of researchers, agricultural extension personnel, and government agencies that assist the Maloti-Drakensberg farmers in adopting more sustainable farming practices to support the growing population without compromising the natural environment are urgently needed. The smallholding feature of Maloti-Drakensberg has the potential to enhance sustainable agricultural development compared with other mountainous farming systems in developed countries (K€ orner and Ohsawa 2005;FAO 2001;Rodrigues et al 2017). This review found limited documentation of the current indigenous knowledge that prevails in Maloti-Drakensberg mountain farming. More research focusing on innovative strategies and establishment of regional networks to better understand the vulnerability of mountain communities is essential. Empowering local people to reverse agrarian-based poverty cycles and natural resource degradation will be essential for the long-term sustainable development of the Maloti-Drakensberg.

A C K N O W L E D G M E N T S
We wish to express our appreciation to Dr Graham Baker and Elisabeth Lickindorf for their assistance with proofreading and editing of this manuscript; also, to Dr Adagbasa Gbenga Efosa for his help in generating the Maloti-Drakensberg map and Prof. Andreas Muhar for providing photographs of terrace farming in the Maloti-Drakensberg. This work was supported by the University of the Free State.