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Meeting growing demand for water and food in Africa, and other parts of the Global South, presents a significant and critical challenge over the next 50 years. This paper draws on an ongoing project in Africa to outline the research-for-development work that is urgently required to facilitate a paradigm shift in agricultural water management. Such work should lead to increased productivity and profitability of agricultural water use to allow agriculture to release some water to meet the growing needs of other sectors, while still meeting food security needs and contributing to a prosperous rural population. [ABSTRACT FROM AUTHOR]

• The North Vam Nao scheme represents a hybrid governance paradigm. • The scheme is characterised by the participatory and hierarchical approaches for its irrigation and flood management. • Collaborative learning and integration of knowledge among stakeholders take place across vertical and horizontal linkages. • The scheme fosters both 'integrative' and 'adaptive' components in its long-term water governance strategy. Conventional state policies for intensive agricultural production in the Vietnamese Mekong Delta (VMD) prescribe the expansion of large-scale water engineering infrastructure. In the upper part of the VMD, compounding environmental challenges presented by climate change, hydropower development upstream, and localised development policies have added greater pressures to rural societies, demanding various governance approaches to deal with change. So far, considerable attention has been devoted to policy narratives of how the bureaucratic approach shapes flood management delta-wide, but little is known about the relevant shift towards adaptive governance at the local level. The analysis presented here is based on qualitative data gathered from fieldworks and desk reviews and argues that the North Vam Nao scheme is an exemplary case for policy transformation in the VMD. A hybrid governance paradigm that is characterised by the participatory and hierarchical approaches allows for the shared learning and interactions of knowledge vertically and horizontally among stakeholders. The study presents nuanced implications of the approach in incorporating both 'integrative' and 'adaptive' components into a long-term water governance strategy, which would serve as a two-pronged contribution to effectively manage environmental uncertainties facing the VMD. It also advocates for the legitimacy of the approach to be institutionalised and widely adopted across the Mekong floodplains and beyond. [ABSTRACT FROM AUTHOR]

Significant expansion of irrigated agriculture is planned in Africa, though existing smallholder schemes perform poorly. Research at six schemes in Mozambique, Tanzania and Zimbabwe shows that a range of problems are exacerbated by poor management, with limited market linkages leading to underutilization and a lack of profit. Improving sustainability of these complex systems will require: multiple interventions at different scales; investing in people and institutions as much as hardware; clarity in governments’ objectives for their smallholder irrigation schemes; appropriate business models to enable farmers; and better market linkages. [ABSTRACT FROM PUBLISHER]

The article discusses on the productivity and profitability of small-scale communal irrigation systems in Sub-Saharan Africa. It explores the six irrigation schemes of Mozambique, Tanzania and Zimbabwe in south-eastern Africa that provide tools to farmers which enables them to measure soil water and fertility and develop their own agronomic practices.

In Australia's Murray-Darling Basin, small-scale engineering works called 'environmental works and measures' have been implemented as a basis for river and other wetland conservation. While implementing these, governments seem to have embraced the beguiling notion that scarce water supplies can be divided further, while conserving the environment and maintaining agricultural production. The difficulties in doing this are expected to increase in the face of extreme climate variability. With this scenario as a backdrop, the $280 million (Monetary values ($) in this paper are in Australian dollars (AUD). At the time of writing AUD $1.00 = ~USD $1.02.) Living Murray and related programmes are assessed to see whether microengineering works to manage the hydrology of wetlands make for effective adaptation to water scarcity and climate change or whether it amounts to an overly narrow adaptation or maladaptation. Some measures were found to be substantially beneficial, such as the construction of fishways. However, under these programmes, only 0.6% of the Basin's wetlands would be inundated and there are significant risks including desiccation of non-target wetlands and further reductions in water allocations for the environment. It is recommended that trade-offs between alternative strategies are assessed as the basis for minimising perverse impacts under changing climatic and hydrological conditions. [ABSTRACT FROM AUTHOR]

Improving crop productivity is crucial to food security and rural livelihoods in southern Africa. However, agricultural intensification at irrigation schemes may place greater demands on water resources, even where water use efficiency (WUE) is improved, due to the paradox of irrigation efficiency. We analysed trends in water use efficiency (WUE), Gross Primary Productivity (GPP), evapotranspiration (ET), evaporation (E), and transpiration (T) at six irrigation schemes which received technological and social interventions. GPP was decoupled from ET at some schemes. For example, at the Landela sub-block of the Silalatshani irrigation scheme in Zimbabwe, GPP and T increased at 4.8% and 4.6% per year, respectively. Conversely, E decreased at 13.5% per year, giving a 3.6% decrease in ET per year from 2013 to 2021. This suggests that crop production can be decoupled from water consumption at southern African irrigation schemes, meaning it is possible to produce more food with less water. [Display omitted] • Water use efficiency was estimated with remote sensing for smallholder irrigation schemes in southern Africa. • Gross primary productivity (GPP) was decoupled from evapotranspiration (ET) at some schemes. This means more crops have been grown with less water. • Decoupling was not observed at all irrigation schemes and is likely to be context dependent. [ABSTRACT FROM AUTHOR]