VOA慢速英语2009年-Agriculture Report - Poultry Farms With Un
时间：2019-01-11 作者：英语课 分类：VOA慢速英语2009年（九）月
This is the VOA Special English Agriculture Report.
Planting trees around poultry 1 farms can improve air and water quality -- and relations with neighbors. Research has shown that just three rows of trees near poultry houses can reduce the release of dust and ammonia. They can also reduce the strong smell of ammonia gas.
Planting trees around poultry farms can reduce dust, ammonia and odor
The trees capture dust, ammonia and odors in their leaves. They also provide shade from the sun, so they reduce cooling costs in summer. And they act as a windbreak, so they reduce heating costs in winter. Trees can also improve water quality around farms by removing pollutants 2 from soil and groundwater.
Several years ago, people were objecting to the odor of poultry farms on the Peninsula in the eastern United States. Delmarva is where the states of Delaware, Maryland and Virginia come together. Two thousand farms there can each house an average of seventy-five thousand chickens.
Traditionally the farms used windows to provide fresh air in the chicken houses. Farmers rarely planted trees or tall crops around the buildings, so there would be no barrier to the airflow.
But then farms began to use new ventilation systems. Instead of windows, the new systems used tunnel fans to circulate air. The fans directed airflow from the poultry houses toward the homes of neighbors.
Researchers led by George Malone at the University of Delaware began dealing 3 with the problem in two thousand. They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half. And they found that odors were reduced by eighteen percent.
The scientists reported their findings in two thousand eight at a meeting of the American Chemical Society.
For the first row nearest the fans, they generally suggested trees that lose their leaves in the fall or trees with waxy 4 leaf surfaces. They suggested evergreen 5 trees for the other two rows. Some trees work better than others. And what works in one area of the country may not work as well in others.
Farmers may think trees will take too long to grow and be effective. But some trees can grow quickly.
At least one-third of the Delmarva farms have planted trees, technically 6 known as vegetative environmental buffers 7. The idea offers a way to cut pollution, save money and energy, and make the neighbors happy.
And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. I'm Steve Ember.
- There is not much poultry in the shops. 商店里禽肉不太多。
- What do you feed the poultry on? 你们用什么饲料喂养家禽?
- Pollutants are constantly being released into the atmosphere. 污染物质正在不断地被排放到大气中去。
- The 1987 Amendments limit 301(g) discharges to a few well-studied nonconventional pollutants. 1987年的修正案把第301条（g）的普通排放限制施加在一些认真研究过的几种非常规污染物上。 来自英汉非文学 - 环境法 - 环境法
- This store has an excellent reputation for fair dealing.该商店因买卖公道而享有极高的声誉。
- His fair dealing earned our confidence.他的诚实的行为获得我们的信任。
- Choose small waxy potatoes for the salad.选些个头小、表皮光滑的土豆做色拉。
- The waxy oil keeps ears from getting too dry.这些蜡状耳油可以保持耳朵不会太干燥。
- Some trees are evergreen;they are called evergreen.有的树是常青的，被叫做常青树。
- There is a small evergreen shrub on the hillside.山腰上有一小块常绿灌木丛。
- Technically it is the most advanced equipment ever.从技术上说，这是最先进的设备。
- The tomato is technically a fruit,although it is eaten as a vegetable.严格地说，西红柿是一种水果，尽管它是当作蔬菜吃的。