Soil erosion decreased their crop yields.
土壤侵蚀降低了他们的作物产量。
Long before the use of machinery and fertilizers, industrious and creative farmers had already used different kinds of methods to increase crop yields.
早在使用机械和化肥之前，勤劳和富有创造性的中国农民就已经采用各种各样的方法来增加农作物产量。
Over the last five decades, improved farming techniques and technologies have helped to significantly increase crop yields along with a 12% expansion of farmed land use.
在过去50年里，改良的农业科技技术显著提高了农作物的产量，耕种面积扩大了12%。
The study used computer models linking crop yields to weather.
这项研究使用计算机模型把粮食产量和天气状况联系起来。
And because it washes away rich topsoil, erosion can threaten crop yields.
并且由于丰富的表层土被冲刷掉，土地侵蚀威胁到农作物产量。
These seemingly simple watershed measures helped boost crop yields dramatically.
这些看似简单的蓄水措施大大提高了农作物收成。
Most of the agriculture is rain-fed, and with lack of rain, crop yields are poor.
这里的大部分农业靠降雨维持，如果缺乏降雨，庄稼的收成就很差。
A decade from now, crop yields in some parts of Africa are expected to drop by 50%.
从现在算起，十年后，非洲一些地区的粮食作物预计将减产50%。
Just a decade from now, crop yields in some parts of Africa are expected to drop by 50%.
仅在十年以后，非洲某些地方的农作物产量预计将减少50%。
The indirect harm, through its impact on water supplies, crop yields and disease is hugely greater.
原因是，气候变化直接影像水的供应，粮食产量和疾病蔓延。
In the past five years, Sanchez said crop yields in the Millenium Villages have about tripled.
在过去5年，这些村庄的庄稼收成翻三番。
Those countries that need higher crop yields will also need to adjust to new types of assistance.
那些需要作物高产的国家同时也将需要新型的援助。
If crop yields are to match the rise in population, then some of them will have to go up dramatically.
如果作物的产量跟人口增长相符合，土地，水，肥中有些将不得不大幅增长。
The super weeds boost costs and cut crop yields for U.S. farmers starting their fall harvest this month.
这些杂草增加了农民的成本并且降低了美国农民本月秋收的产量。
Warmer temperatures are actually leading to increased crop yields in some parts of North America and Russia.
更加暖和的气温实际上能够增加北美以及俄罗斯一部分地区的农作物产量。
Some scientists believe, for instance, that crop yields decline 10 percent for each degree rise in temperature.
例如有一些科学家就认为：气温每升高一度，农作物产量就会下降百分之十。
To be more exact: growth in population and demand for food have both slowed down, but crop yields have slowed more.
为了更准确：人口增长和食物需求增长都放慢了，但粮食产量放慢更多。
Rivers and streams are drying up, crop yields are plummeting, and trees have begun to flower long before spring arrives.
河水和溪流日渐干涸，农作物产量急剧下降，离春天还远，树木就进入了花期。
Of course, wealthy countries are affected: long-term drought in Australia has caused certain crop yields to plummet.
当然了，富裕国家也受到了影响：长期的干旱已经造成澳大利亚农作物产量暴跌。
What's more, climate change is expected to make some regions drier or hotter, which may send crop yields plummeting.
更有甚者，气候的变化很可能使这些地区或越来越干燥，越来越炎热，致使农作物歉收，产量直线下降。
Powerguda's crop yields from the dry soil were so low that most of the villagers had taken to migrant work on other farms.
普尔古达的干旱土壤使得农作物收成很差，因此，大多数村民都在别的农场干活。
Tissue culture has produced plants that are increasing crop yields by providing farmers with healthier planting material.
组织培养生产的植物，通过向农民提供更加健康的种植材料而提高作物单产。
Tissue culture has produced plants that are increasing crop yields by providing farmers with healthier planting material.
组织培养生产的植物，通过向农民提供更加健康的种植材料而提高作物单产。
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