Curated Content

Water is the main factor affecting crop production in sub-Saharan Africa. It was hypothesized that intercropping sorghum (S) with either cowpea (C) or bottle gourd (B) would result in better productivity and water use efficiency (WUE). This was evaluated using a split-plot design with sub-plots arranged in a randomised complete block manner within the main plot, replicated thrice. Water regimes [full irrigation (FI), deficit irrigation (DI) and rainfed (RF)] were allocated to the main plots. Sub-plots comprised intercrop combinations, SS (sole), C (sole), B (sole), SC (intercrop) and SB (intercrop). Data collected included soil water content (SWC), plant height (PH)/vine length, leaf number (LN), tillering (T)/branching, leaf area index (LAI), relative leaf water content (RWC), stomatal conductance (gs) and chlorophyll content index (CCI) as well as biomass accumulation and partitioning. Yield and yield components, water use (WU) and WUE for grain (WUEg) were calculated at harvest. Land equivalent ratio (LER) was used to evaluate productivity of the intercrop. Sorghum canopy size decreased (P < 0.05) (−6.7%, −10.6%, −89% and −79% for PH, LN, T and LAI, respectively) with decreasing water availability. Sorghum growth and development were unaffected by intercropping. Intercropping sorghum with cowpea improved gs (23%) and CCI (6.56%) of sorghum under low water availability. Productivity of sorghum across varying water regimes and cropping systems was stable with final biomass, yield and harvest index of 2.4 t ha−1, 0.98 t ha−1 and 35%, respectively. Overall, LER showed a 46% increase in productivity across all intercrop systems. Intercropping marginally increased WU (5.64%). Improvements of WUEg were observed under SC and SB (54.65% and 46.98%, respectively) relative to SS. Intercropping sorghum with cowpea is recommended for semi-and arid environments since it promoted efficient use of water.

Farmers who still cultivate bambara groundnut (Vigna subterranea) rely on landraces and seed retained from previous harvests. Given that the crop is typically cultivated in semi-arid regions, seed quality of farmers’ retained seed might be compromised due to water stress experienced by maternal plants during production. The aim of this study was to determine the effect of water stress on maternal plants on subsequent seed quality of bambara groundnut. A single bambara groundnut landrace was characterised into four distinct selections based on seed coat and speckling colour. Initial seed quality (viability and vigour) was evaluated prior to planting seed in a field trial under irrigated and rainfed conditions. Final yield and yield components were determined at harvest. Thereafter, seed quality (viability and vigour) of progeny of different landrace selections was evaluated. Yield was lower under rainfed than irrigated conditions. Overall, subsequent seed quality showed improvement from initial seed quality of the original seedlot. Seed viability was higher in seeds produced under irrigated than rainfed conditions. Seed quality of bambara groundnut may be reduced underwater-limited production conditions. Seed enhancement practices such as priming may assist farmers to achieve better emergence. In the long term, seed production should be done under optimum conditions in order to achieve high-seed quality.

Climate Smart Agriculture (CSA) is crop and livestock production that sustainably increases productivity, resilience (adaptation), reduces/removes greenhouse gases (mitigation), and enhances achievement of national food security and development goals. CSA encourages the use of all available and applicable climate change solutions in a pragmatic and impact-focused manner. The Food Agriculture and Natural Resources Policy Analysis Network (FANRPAN) commissioned this scoping study on CSA with the overall objective of creating a policy environment that increase agricultural productivity and strengthen the resilience of vulnerable smallholder farmers to the impacts of climate change.

Three sweet potato cultivars (A40, A45 and 199062.1) were planted in three small-scale farms located under different agro-ecological zones of KwaZulu-Natal. The objective was to assess growth, physiological responses and yield of the sweet potato cultivars under low-input agricultural system and different environmental conditions. Sweet potato planted at Richards Bay (28°19'S; 32°06E), a coastal sandy soil location, recorded low stomatal conductance(SC; 102.2 m moles m−2 s−1) and chlorophyll content index (CCI; 29.4). This consequently resulted in reduced vine length, leaf number and branching of sweet potato plants. Environmental conditions in that location (Richards Bay) such as high evapotranspiration, high temperatures and low water retention capacity of sandy soils created drought stress condition. This caused reduction in photosynthetic activities and translocation to the harvestable plant parts. The other two locations (Deepdale at 28°01'S; 28°99'E and Umbumbulu at 29°98'S; 30°70'E) located further from the coast and characterized by clayey soils recorded higher SC and CCI. Branching and number of leaves were significantly influenced by locations and growing season while vine length varied with locations, indicating specific varietal adaptation. Biomass and storage root yield followed a similar trend as plant growth and physiology. Richards Bay recorded very low biomass and storage root yield (5.4 and 5.0 t ha−1) in both seasons while Deepdale recorded higher yields (42.0 t ha−1) during the first growing season. Yields reduced by 67% (13.6 t ha−1) in the second season. Storage root yields from Umbumbulu were stable in both growing seasons (29.4 and 28 t ha−1 during seasons one and two, respectively). Adding fertilizer only improved storage roots yield in Richards Bay, otherwise cultural practises were responsible for storage root yield increases in Deepdale and Umbumbulu. Orange-fleshed sweet potato cultivar A45 showed good environmental plasticity while cultivar 199062.1 responded well to fertilizer application. This indicated its suitability for use in food security programmes under low-input agriculture.

Amaranthus cruentus, Corchorus olitorius and Vigna unguiculata are traditional leafy vegetables with potential to improve nutritional security of vulnerable people. The promotion of these crops is partly hindered by the lack of agronomic information. The effect of plant spacing on growth, physiology and yield of these three leafy vegetables was evaluated under commercial-scale production at Roodeplaat, Pretoria over two summer seasons, 2011/12 and 2012/13. A randomised complete block design was used with plant density (100 000, 66 666 and 50 000 plants ha−1) as a factor. Chlorophyll content index (CCI), chlorophyll fluorescence, stomatal conductance, leaf number, leaf area index (LAI) and biomass were measured in situ. Planting at 100 000 plants ha−1 resulted in lower (P < 0.05) LAI, CCI and biomass per plant for A. cruentus and C. olitorius. Total yield of A. cruentus, C. olitorius andV. unguiculata was higher (P < 0.05) at 100 000 plants ha−1 relative to 50 000 and 66 666 plants ha−1. For A. cruentus and C. olitorius, higher leaf attributes (CCI, plant height, leaf number, biomass per plant and LAI) were obtained and this indicated that traditional leafy vegetables can be produced commercially under lower densities using a drip irrigation system. Using 66 666 plants ha−1 is suitable for commercial production of A. cruentus and C. olitorius, whereas 50 000 plants ha−1 may be recommended under low water availability. For V. unguiculata 100 000 plants ha−1 is recommended.

The 2015-2019 Government Programme bearing the overarching theme “Achieving Meaningful Change” and inspired by “innovative socialism” is to transform Mauritius into an environmentally sustainable, economically vibrant and modern country with enhanced infrastructure, global connectivity, an empowered labour force and a good of quality of life for one and all.

Mauritius is faced today with the triple challenge of coping with a high budget deficit; adapting to the erosion of preferences in respect of sugar and textiles in a situation where the balance of trade is negative; and facilitating the emergence of new poles of development.

  These challenges have to be viewed against the background of the triple shock facing Mauritius, namely the 36% reduction of the sugar price brought by the reform of the EU Sugar Regime; the continually rising oil prices; and the dismantling of the Multifibre Agreement and the WTO negotiations on Non Agricultural Market Access which would adversely impact on the Textile and Clothing and Fisheries sectors.

The sugar sector will have to face lower sugar prices and fiercer competitors, having unlimited access, at the same time. The textile sector, which has already lost 1/4 of its labour force in the last three years, will not only face competition from China but also the drop in the tariff protection in preferential markets with further adverse social and economic consequences. While tourism is a very promising sector, it is quite fragile given its dependence on extraneous factors namely international events including the spread of new viruses and social peace and harmony. Moreover, the tourism sector depends on the positive externalities of the sugar industry: soil conservation and the prevention of silt deposit in lagoons, greenery and aesthetic effects of cane plantations.

In Namibia, agriculture employs 30% of the labour force and contributes 7.5% to GDP. More than 60% of the farming is done by subsistence farmers. The sector is facing challenges such as low soil fertility and water shortage. To counter these challenges, sustainable land management practices are needed, but subsistence farmers face constraints in adopting these practices. Hence, this study was conducted to identify what practices the farmers are currently using and what constraints they are facing in adopting sustainable land management practices. Semi-structured interviews were carried out with 15 farmers in the Oshikoto Region. The interviews were recorded, transcribed word for word and thematic analysis applied to the answers. The study showed that the farmers were using some sustainable practices such as manure and mould from termite hills as fertilizer. However, unsustainable practices such as tractor-drawn disk harrows and inorganic fertilizer were also used. The constraints that affectfarmers’ adoption of sustainable land management practices include climate characteristics,especially low and unpredictable rainfall; limited farmland size; lack of extension services and institutional support; labour shortages; and lack of finances and other resources. Based on these findings it is recommended that extension delivery to farmers in the study area must be strengthened, that projects combating climate change must be down streamed to subsistencefarmers, and that farmers should be encouraged and supported to use ‘easy to adopt’sustainable practices, e.g. crop rotation and ripping. It is also suggested that long-term weather forecasts should be made available to the farmers through the radio. This could have a significantly positive impact on the environment as well as on subsistence farmers’ situationand household food security.

This document describes the requirements to move dogs and cats out of or into Botswana successfully without putting the animals in distress.

The project mainstreams the climate risk considerations in the Land Rehabilitation Programme of Lesotho for improved ecosystem resilience and reduced vulnerability of livelihoods to climate shocks.