VOA慢速英语2010年-Development Report - Solar-Powered Pum

This is the VOA Special English Development Report.

Harvest in Benin

A new study in West Africa shows how farm irrigation systems powered by the sun can produce more food and money for villagers. The study in Benin found that solar-powered pumps are effective in supplying water, especially during the long dry season.

Sub-Saharan Africa is the part of the world with the least food security. The United Nations Food and Agriculture Organization estimates that more than one billion of the world's people faced hunger last year. Around two hundred sixty-five million of them live south of the Sahara Desert. Lack of rainfall is one of their main causes of food shortages.

Jennifer Burney from Stanford University in California led the study. The research team helped build three solar-powered drip irrigation systems in northern Benin.

Between thirty and thirty-five women used each system to pump water from the ground or a stream. Each woman was responsible for farming her own one hundred twenty square meters of land. They also farmed other land collectively.

The solar-powered irrigation systems produced an average of nearly two metric tons of vegetables per month. During the first year, the women kept a monthly average of almost nine kilograms of vegetables for home use.

They sold the surplus produce at local markets. The earnings¹ greatly increased their ability to buy food during the dry season which can last six to nine months.

People in the two villages with the systems were able to eat three to five more servings of vegetables per day. But making the surplus available at markets also had a wider effect.

The study compared the villages with two others where women farmed with traditional methods like carrying water in buckets. The amount of vegetables eaten in those villages also increased, though not as much.

The researchers note that only four percent of the cropland in sub-Saharan Africa is irrigated². Using solar power to pump water has higher costs at first. But the study says it can be more economical in the long term than using fuels like gasoline, diesel³ or kerosene⁴. And solar power is environmentally friendly.

The study appears this month in the Proceedings⁵ of the National Academy of Sciences.

And that's the VOA Special English Development Report, written by June Simms. You can post comments and learn about other issues in the developing world at voaspecialenglish.com. I'm Steve Ember.

1 earnings   

n.工资收人；利润，利益，所得

参考例句：

• That old man lives on the earnings of his daughter.那个老人靠他女儿的收入维持生活。
• Last year there was a 20% decrease in his earnings.去年他的收入减少了20%。

2 irrigated   

[医]冲洗的

参考例句：

• They irrigated their crops with water from this river. 他们用这条小河里的水浇庄稼。
• A crop can be sown, weeded, irrigated, and fertilized uniformly. 一种作物可以均匀一致地进行播种，除草，灌溉和施肥。

3 diesel   

n.柴油发动机，内燃机

参考例句：

• We experimented with diesel engines to drive the pumps.我们试着用柴油机来带动水泵。
• My tractor operates on diesel oil.我的那台拖拉机用柴油开动。

4 kerosene   

n.(kerosine)煤油，火油

参考例句：

• It is like putting out a fire with kerosene.这就像用煤油灭火。
• Instead of electricity,there were kerosene lanterns.没有电，有煤油灯。

5 proceedings   

n.进程，过程，议程；诉讼(程序)；公报

参考例句：

• He was released on bail pending committal proceedings. 他交保获释正在候审。
• to initiate legal proceedings against sb 对某人提起诉讼