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英语演讲---农药的重要性
The significance of pesticides (农药的重要性) Yaping ZHAO Pharmaceutical Engineering and Technology Definition of pesticide Pesticides are chemicals that we use to kill undesireable organisms Pesticides and agricultural production can not be separated With the rapid world population growth, the urgent need for agricultural products, is to continue to develop high-yield, high-efficiency agriculture, or to take low-yield organic farming? Population and food In July 11, 2009--the 20th World Population Day , World Population again aroused peoples attention. The statistics published by German Federal Statistics Office show that global population is approximately 6.8 billion. WHO projections that,by 2012,the world population will exceed 7.0 billion;by 2050, the world population will reach 9.1 billion. Status of the worlds population and agriculture Per capita arable land(人均可供种土地) will reduce from 1.5 hectares(公顷) in 1960 to 0.2 hectares in 2015. The proportion of hungry people worldwide Developing countries (1949):45% Global (1970):35% (1990):18% (2010):12% Use of agricultural chemicals is essential 1.Weed,disease and insect still cuts down the crop yields. Use of agricultural chemicals is essential 2.If farmers stop using pesticides, yields of crops will greatly cut down. Use of agricultural chemicals is essential 3.Improper control for pest and weed, will reduce output more than 30%. Organic Agriculture Research Research showed that grain yield decreased by 21% to the modern high-yield agriculture. While the consumption of agricultural labor force has increased by 42%. From the final economic perspective, organic agriculture is indeed a low-yield agriculture To meet the food needs of 8.5 billion people, we need to reclaim 558,000 square miles of forest land and virgin land.As the result, it will cause more damage for global environment . Conclusions Must make full use of existing land resources Rational use of pesticides The development of efficie
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