Saline soils, which have high concentrations of sodium chloride and other salts, limit plant growth, and research continues to focus on developing salt-tolerant varieties of agricultural crops.

盐碱地含有高浓度的氯化钠和其他盐类，限制了植物的生长，研究继续集中于开发耐盐的农作物品种。

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Three things limit plant growth: light, water, and temperature.

有三个要素会限制植物生长：阳光、温度和水。

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Meanwhile, bad weather has delayed TEPCO's plans to limit the spread of radiation from the plant.

同时，糟糕的天气推迟了TEPCO限制工厂辐射扩散的计划。

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The plant's operator Tokyo Electric Power Co (Tepco) said exposure to radiation levels in the No 3 reactor for four-and-a-half hours would exceed the emergency safety limit for power plant workers.

BBC: Robots record high radiation levels at Japan reactors

Plant ecologists know that the northern limit of the forest is determined by the mean July temperature.

FORBES: Global Warming: Hotheads, Flatliners and Lukewarmers, Part One

Then, the only limit will be how much plant material is available (see article).

ECONOMIST: The future of energy