Methods and technologies to improve efficiency of water use

Abstract

The competition for existing freshwater supplies will require a paradigmatic shift from maximizing productivity per unit of land area to maximizing productivity per unit of water consumed. This shift will, in turn, demand broad systems approaches that physically and biologically optimize irrigation relative to water delivery and application schemes, rainfall, critical growth stages, soil fertility, location, and weather. Water can be conserved at a watershed or regional level for other uses only if evaporation, transpiration, or both are reduced and unrecoverable losses to unusable sinks are minimized (e.g., salty groundwater or oceans). Agricultural advances will include implementation of crop location strategies, conversion to crops with higher economic value or productivity per unit of water consumed, and adoption of alternate drought‐tolerant crops. Emerging computerized GPS‐based precision irrigation technologies for self‐propelled sprinklers and microirrigation systems will enable growers to apply water and agrochemicals more precisely and site specifically to match soil and plant status and needs as provided by wireless sensor networks. Agriculturalists will need to exercise flexibility in managing the rate, frequency, and duration of water supplies to successfully allocate limited water and other inputs to crops. The most effective means to conserve water appears to be through carefully managed deficit irrigation strategies that are supported by advanced irrigation system and flexible, state‐of‐the‐art water delivery systems. Nonagricultural water users will need to exercise patience as tools reflecting the paradigmatic shift are actualized. Both groups will need to cooperate and compromise as they practice more conservative approaches to freshwater consumption.

Technical concepts related to conservation of irrigation and rainwater in agricultural systems

“…Huffaker [2008 deals with the economic considerations and policy issue associated with water conservation programs. Evans and Sadler [2008] discuss crop water productivity issues and the potential for precision agriculture and deficit irrigation. Letey and Feng [2007] discusses salinity issues and leaching requirements.…”

A global approach to estimate irrigated areas – a comparison between different data and statistics

“…Due to climate change in some areas agricultural water availability is expected to decrease (Strzepek and Boehlert, 2010). The low irrigation efficiency of the common irrigation techniques such as sprinkler and flood irrigation (Evans and Sadler, 2008), the unsustainable usages of limited sources like groundwater (Wada et al, 2014), the changing river regimes (Döll and Schmied, 2012) and the changing supply by snowmelt (Mankin et al, 2015;Prasch et al, 2013) underline the need for a transition towards more sustainable and efficient use of water. The UN Sustainable Development Goals clearly reflect this need to achieve food security and the sustainable development of land use (UN, 2016).…”

Could Changing Power Relationships Lead to Better Water Sharing in Central Asia?

“…Even though irrigated agriculture must increase the production of food to an increasing population, the production of irrigated lands and available water are decreasing. At the same time, increasing the water use efficiency in general results in reduced harvests [93]. Thus, it is difficult to foresee any major changes in the increasing irrigation needs for the coming decades.…”