{"id":7774,"date":"2016-02-18T09:27:59","date_gmt":"2016-02-18T09:27:59","guid":{"rendered":"http:\/\/revoscience.com\/en\/?p=7774"},"modified":"2016-02-18T09:27:59","modified_gmt":"2016-02-18T09:27:59","slug":"better-water-management-could-halve-the-global-food-gap","status":"publish","type":"post","link":"https:\/\/www.revoscience.com\/en\/better-water-management-could-halve-the-global-food-gap\/","title":{"rendered":"Better water management could halve the global food gap"},"content":{"rendered":"

Improved agricultural water management could halve the global food gap by 2050 and buffer some of the harmful climate change effects on crop yields.<\/strong><\/em><\/span><\/p>\n

\"Photo<\/a>
Photo courtesy of USDA Natural Resources Conservation Service. \/ Public Domain via Wikimediacommons<\/figcaption><\/figure>\n

For the first time, scientists investigated systematically the worldwide potential to produce more food with the same amount of water by optimizing rain use and irrigation. They found the potential has previously been underestimated. Investing in crop water management could substantially reduce hunger while at the same time making up for population growth. However, putting the findings into practice would require specific local solutions, which remains a challenge.<\/span>

\u201cSmart water use can boost agricultural production \u2013 we\u2019ve in fact been surprised to see such sizeable effects at the global level,\u201d says lead-author Jonas J\u00e4germeyr from the Potsdam Institute for Climate Impact Research. In a water management scenario the scientists call ambitious, global kilocalorie production could rise by 40 percent, while according to UN estimates roughly 80 percent would be needed to eradicate hunger by the middle of this century. But even in less ambitious scenarios, results show that integrated crop water management could make a crucial contribution to filling the plates of the poor, says J\u00e4germeyr. \u201cIt turns out that crop water management is a largely underrated approach to reduce undernourishment and increase climate resilience of smallholders.\u201d<\/span>

Large yield increase potential in China, Mexico, Australia<\/span>

The scientists have run comprehensive biophysical computer simulations, constraining these in such a way that croplands do not expand into forests and no additional water resources are needed. As it is a global study, it provides detailed vegetation dynamics and water use effects in river basins \u2013 certainly too coarse to simulate farm-level conditions but suited to identify regional hotspots. For example, the yield increase potential of crop water management is found to be particularly large in water-scarce regions such as in China, Australia, the western US, Mexico, and South Africa.<\/span><\/p>\n

[pullquote]The scientists have run comprehensive biophysical computer simulations, constraining these in such a way that croplands do not expand into forests and no additional water resources are needed.[\/pullquote]<\/p>\n

\u201cAssessing the potential is tricky: If upstream farmers reroute otherwise wasted water to increase irrigation and production, less water returns to downstream users and consequently this can affect their production,\u201d says co-author and team leader Dieter Gerten. \u201cBelow the line, we found that the overall production increases. Still, this of course poses quite some distributional challenges. Also, a lot of local government regulation and incentives such as-micro credit schemes are needed to put crop water management into large-scale practice.\u201d<\/span>

Mulching and drip systems to counter climate change impacts<\/span>

The scientists took into account a number of very different concrete water management options, from low-tech solutions for smallholders to the industrial scale. Water harvesting by collecting excess rain run-off for instance in cisterns \u2013 for supplementary irrigation during dry spells \u2013 is a common traditional approach in some regions such as the Sahel region in Africa, but is under-used in many other semi-arid regions such as Asia and North America. Mulching is another option \u2013 the soil gets covered either simply with crop residues left on the field, reducing evaporation, or with huge plastic sheets. Finally, a major contribution to the global potential is upgrading irrigation to drip systems.<\/span>

It is especially under ongoing climate change that water management becomes increasingly important to reduce food risks. The reason is that global warming is likely to increase droughts and change rainfall patterns, so water availability becomes even more critical than before. Assuming a moderate CO2 fertilization effect \u2013 plants take up CO2 and could hence benefit from higher concentrations in the air, but the magnitude of this effect is still under debate \u2013, the study shows that in most climate policy scenarios water management can counterbalance a large part of the regional warming impacts on farming. Yet if greenhouse-gas emissions from burning fossil fuels are not reduced at all, in a business-as-usual scenario, water management will clearly not suffice to outweigh the negative climate effects.<\/span>

Given the planetary boundaries, decision-makers should look into water use<\/span>

\u201dWater management is key for tackling the greater sustainability challenge,\u201d says Wolfgang Lucht, co-author of the study and co-chair of PIK\u2019s research domain Earth System Analysis. \u201cIt has been an issue in many local and regional studies and its effects on farm level have been well demonstrated, but on the global level it has been somewhat neglected. The renewed Sustainable Development Goals \u2013 while stipulating sustainable agriculture among all nations \u2013 need to be based on more evidence on how to achieve it; they do not focus on water use very much. Since we\u2019re rapidly approaching planetary boundaries, our study should indeed draw the attention of decision-makers of all levels to the potential of integrated crop water management.\u201d<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

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