The results indicated that root-divided alternative irrigation could increase root activities, photosynthesis rate and water use efficiency of tobacco leaf, but decrease transpiration rate;

结果表明，分根交替灌溉可增强烟株的根系活力，保持较高的光合速率，降低蒸腾速率，提高叶片瞬时水分利用效率；

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But others use pure wastewater for irrigation, suggesting that they have no alternative.

而更多的情况是，很多人不得不使用纯废水灌溉，因为他们没有其他选择。

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One alternative that will also supplement your irrigation is by simply directing roof gutter flow into your planted box areas or other drainage-designed landscape plants.

一个替代方案，也将补充灌溉是你只要引导到您的种植箱区或其他排水设计，园林植物，屋顶排水沟流。

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Alternative livelihoods such as ecotourism and fish farming could provide an alternative to intensive crop farming, while better management of crops and irrigation and the adoption of alternative energy sources such as solar power would all contribute to environmental sustainability.

CNN: Growing deserts 'a global problem'

These conditions are forcing the farmers to plant alternative crops and to search for other sources of irrigation.

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