英语Working the land
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The researchers say the findings show that organic crop production rates change little over time，and that soil fertility increases.They say the findings suggest that organic farmers can help the environment by increasing soil fertility.
话题美文欣赏
课前自主导学 考点难点易混点
The scientists say the organic fields had more nutrients in the soil.The soils in the organic fields also had more biological activity than the other fields.The organic fields had more helpful organisms and a larger number of different organisms.The organic fields had almost two times as many insects，including helpful insects.In traditional farming，chemicals designed to kill harmful insects can also kill helpful ones.
话题美文欣赏
课前自主导学 考点难点易混点
True(T)or False(F)．
百度文库
disease.The study showed that organic fields produced fewer crops，
on average， than other fields.However，the scientists say the
organic methods improved the health of the soil and used half as
话题美文欣赏
课前自主导学 考点难点易混点
The study found that the organic fields produced about twenty percent fewer crops than the other fields.However，the farmers used less fertilizer and energy on the organic fields.They found the organic fields were healthier.
Agricultural scientists in Switzerland have demonstrated the
longterm effects of organic farming methods.Organic farms use no
manmade chemicals to increase crops or control insects and
Traditional farming methods were used in two fields.Organic farming methods were used in the others.The scientists grew potatoes，barley(大麦)，winter wheat，beets(甜 菜)and grass clover(苜蓿)．The crops，planting methods，and soil use were similar in all the fields studied.
话题美文欣赏
课前自主导学 考点难点易混点
Organic farming is becoming increasingly popular in some countries.Many people believe that eating organic food is more healthful than eating food grown with chemicals.Some people are willing to pay more money to buy organic food.
Association for the Advancement of Science.
话题美文欣赏
课前自主导学 考点难点易混点
It was one of the longestrunning studies of its kind.The Swiss scientists compared the effects of organic and traditional farming methods over a period of more than twenty years.They grew crops in four fields of land in Switzerland.
Unit 2 Working the land
话题美文欣赏
课前自主导学 考点难点易混点
有机农业是指按照一定的生产标准，在生产中遵循自然 规律和生态学原理，采用一系列可持续发展的农业技术以维 持持续稳定的农业生产体系的一种农业生产方式。
话题美文欣赏
课前自主导学 考点难点易混点
Organic farming study
much energy.
Scientists at the Research Institute of Organic Agriculture in
Frick ， Switzerland ， supervised the study.They reported their
findings in the Science magazine，the publication of the American
话题美文欣赏
课前自主导学 考点难点易混点
The scientists say the organic fields had more nutrients in the soil.The soils in the organic fields also had more biological activity than the other fields.The organic fields had more helpful organisms and a larger number of different organisms.The organic fields had almost two times as many insects，including helpful insects.In traditional farming，chemicals designed to kill harmful insects can also kill helpful ones.
话题美文欣赏
课前自主导学 考点难点易混点
True(T)or False(F)．
百度文库
disease.The study showed that organic fields produced fewer crops，
on average， than other fields.However，the scientists say the
organic methods improved the health of the soil and used half as
话题美文欣赏
课前自主导学 考点难点易混点
The study found that the organic fields produced about twenty percent fewer crops than the other fields.However，the farmers used less fertilizer and energy on the organic fields.They found the organic fields were healthier.
Agricultural scientists in Switzerland have demonstrated the
longterm effects of organic farming methods.Organic farms use no
manmade chemicals to increase crops or control insects and
Traditional farming methods were used in two fields.Organic farming methods were used in the others.The scientists grew potatoes，barley(大麦)，winter wheat，beets(甜 菜)and grass clover(苜蓿)．The crops，planting methods，and soil use were similar in all the fields studied.
话题美文欣赏
课前自主导学 考点难点易混点
Organic farming is becoming increasingly popular in some countries.Many people believe that eating organic food is more healthful than eating food grown with chemicals.Some people are willing to pay more money to buy organic food.
Association for the Advancement of Science.
话题美文欣赏
课前自主导学 考点难点易混点
It was one of the longestrunning studies of its kind.The Swiss scientists compared the effects of organic and traditional farming methods over a period of more than twenty years.They grew crops in four fields of land in Switzerland.
Unit 2 Working the land
话题美文欣赏
课前自主导学 考点难点易混点
有机农业是指按照一定的生产标准，在生产中遵循自然 规律和生态学原理，采用一系列可持续发展的农业技术以维 持持续稳定的农业生产体系的一种农业生产方式。
话题美文欣赏
课前自主导学 考点难点易混点
Organic farming study
much energy.
Scientists at the Research Institute of Organic Agriculture in
Frick ， Switzerland ， supervised the study.They reported their
findings in the Science magazine，the publication of the American