And,for farmers, a more valuable dollar meant lower prices for crops.

VOA: special.2010.06.24

The biodiversity has shrunk for various reasons of profitability and as a consequence of that things like corn crops, and the orange crops in Florida are particularly susceptible to certain environmental conditions, certain pests, and certain types of blight.

生物多样性的减少源自利益的驱动,和玉米一样,佛罗里达的柑橘作物很容易受到,一定环境条件的影响,还有虫害和枯萎病

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Serfs who are compelled to work the land, or in some places even slaves, well, they have no incentive, put aside the question even of capacity, to invest capital for the purpose of improving the size and quality of the their crops, their trees, their vines.

那些被强迫耕种土地的农奴,或者是那些在其他地方直接成为奴隶的人,刨除能动性因素,农场主们,没有任何理由投资钱财,去改善他们农作物,果树和葡萄,的种植规模和品质

耶鲁公开课 - 古希腊历史简介课程节选

For example,she noted that crops designed to resist damage by glyphosate need fewer pesticides that are more toxic to the soil.

VOA: special.2010.04.27

The Chavez family joined thousands of other farm workers who traveled around the state of California to harvest crops for farm owners.

VOA: special.2009.09.06

Later,while Mister Chavez worked for little or no money to organize farm workers, his wife harvested crops.

VOA: special.2009.09.06

The farmers are paid back for the inputs if their crops fail because of drought or flood.

VOA: special.2010.05.11

Scientists are working to develop crops that can reduce the amount of water used for agriculture.

VOA: special.2009.01.20

They had a good water supply in Frijoles Creek and fertile land for growing crops.

VOA: special.2010.07.05

For example,young children grow crops in a school garden and learn about healthy eating.

VOA: special.2010.01.21

She says they found that genetically engineered crops can be better for the environment.

VOA: special.2010.04.27

But he calls on government agencies for more tests and increased watchfulness over G.M.crops.

VOA: special.2010.03.23

For example,they can plant crops that are more likely to survive extreme weather.

VOA: special.2010.02.09

The soil was not good for growing crops,and disease was destroying the plants.

VOA: special.2009.11.10

Farmers planted more of their best crops, or "cash crops." for export.

VOA: special.2010.03.30

And Joom from Thailand wrote: I don't care where the crops come from, natural plants or genetic engineering, as long as we can produce food enough for people.

VOA: special.2010.05.18

Melting snow provides water for rivers,electric power centers and agricultural crops.

VOA: special.2010.01.05

The agricultural economist points to the demand for locally grown crops.

VOA: special.2009.12.22

Then,some people learned to grow crops and raise animals for food.

VOA: special.2010.01.31

However,G.M.crops have been grown and used for thirteen years.

VOA: special.2010.03.23

They planted fewer food crops for local use.

VOA: special.2010.03.30

for American agriculture. Many crops failed.

VOA: special.2009.01.01

Vichai also warns that increasing demand for bio-fuels from grain could reduce food crops, forcing the price of food grains higher.

VOA: standard.2009.12.17

It calls for genetic improvement of crops through conventional plant breeding and through direct genetic modification of crops.

VOA: standard.2009.10.21

He says because GM crops can be designed to be resistant to insects and disease they may also be better for the environment.

VOA: standard.2009.10.21

And with no money for seeds, and insects attacking her crops, the next harvest is at risk.

VOA: standard.2010.03.30

Pretty says the Royal Society is not giving blanket support for GM foods, but says GM crops should be looked at on a case-by-case basis.

VOA: standard.2009.10.21

It warns of a nearing catastrophe. For Intifar's father, Mahmoud Abu Ibrahim,a farmer in his 80s whose crops depend on rainfall, the catastrophe is here.

VOA: standard.2009.08.01

U.S.subsidy programs for maize, wheat,and other crops are very similar to the cotton program.

VOA: standard.2010.04.28

For a small farmer, replacing a bucket with a pump can lead to cultivating a wider variety of crops and creating work for family and neighbors.

VOA: standard.2010.08.09