unit2 Chemical or Organic Farming.ppt

1、Chemical Or Organic Farming?,Reading,Made by Du Yi,chemical organic fertile fertilize fertilizer mineral nutrition,adj. 化学的; 关于化学的,adj. 有机的；器官的,adj. 肥沃的，富饶的,n. 营养; 滋养; 食物,n. 矿物; 矿石,n. 肥料；化肥,vt. 施肥,build up lead to focus on keep free from/of,使免受(影响, 伤害等)；使不含(有害物)逐渐增强; 建立; 开发导致; 造成 (后果)集中 (注意力, 精力等) 于

2、,If you were a landowner, you want to grow some kinds of crops, how will you do?,First, buy or select the seeds from the store.,Second, we need to plow（犁田） or turn over the soil.,Third , we sow （播种）the seeds in the soil.,Finally, we can harvest our grain/sorghum/peanuts .,fertilize the soil,to impro

3、ve the output of the crops,fertilizer,How many kinds of fertilizers do farmers use ?And what are they?,Chemical fertilizers,natural waste from animals,Which kind do farmers use when they are doing organic farming ?,The second one-natural waste from animals,_ fertilizers can cause many _, so organic

4、farming is becoming more_.,Chemical,problems,popular,To get the main idea of this passage.,Listening task:,Task 1 Skimming （3mins）,Find out the main idea of these four paragraphs.,Long-term use of chemical fertilizers can cause damage to the land and peoples health.,Problems caused by chemical ferti

5、lizers.,P1.,P2.,Farmers and customers turn to organic farming.,Other methods to keep the soil fertile.,P3.,P4.,Para1:,1.Why are chemical fertilizers so popular in farming today? 2.Do you think it is really a great way?,They are a great way to stop crop disease and increase production.,No,Task 2 Scan

6、ning,What problems can be caused by using chemical fertilizers? (disadvantage),Firstly, they damage the land by killing the helpful bacteria and pests.,Thirdly, fruit, vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition.,Para2:,Secondly, Chemi

7、cals staying in the ground and underground water for a long time affects crops and, therefore, animals and humans. And many of the chemicals can lead to cancer or other illnesses.,1.What is organic farming? 2. What is the advantages of using natural fertilizer?,Para3:,1.What is organic farming?,Orga

8、nic farming is simply farming without using any_.,green food,chemicals,2. What is the advantages of using natural fertilizer?,* Reduce diseases in crops and help them grow strong and healthy. * Make the soil richer in minerals and so more fertile. * Besides, keep the air, soil and water as well as t

9、he food supply free from chemical.,Para4:,1. What three methods are mentioned in this paragraph? 2.What is the same goal of these different organic farming methods?,What three methods are mentioned in this paragraph?,Change the kind of crop in each field every few years.,2) Plant crops to use differ

10、ent levels of soil.,3) Plant grass between crops and leave it in the ground.,2.What is the same goal of these different organic farming methods?,The same goal is to grow good food and avoid damaging the environment or peoples health.,Suppose you were a farmer. What kind of farming will you choose, chemical or organic farming? Why ?,provide,organic farming,green food,keep healthy,Disc