Unit 2 Chemical or Organic farming?

Farming Are you from a farmer’s family? what do you know about farming? soil ploughing crops weather &climate Irrigating ( 灌溉 ) ……

Main idea of the text ? Chemical fertilizes can cause many problems, so organic farming is becoming more popular. First reading ( 3ms )

Read and then find out the topic sentence of each paragraph. Para 1: Para 2: Para 3: Para 4: Recently, scientists have been finding that long-term use of these fertilizer can cause damage to the land and dangerous to people’s health. Farmers turn to organic farming. Organic farmers use many other methods to keep the soil fertile. Some of the problems caused by chemical fertilizers

Read again and answer the following questions: 1.Why are chemical fertilizers so common in farming? 2.What problems are caused by using chemical fertilizers? 3. What is organic farming? 4. How do organic farmers to keep the soil fertile? Second reading ( 5ms )

1.What do chemical fertilizers become very common in farming? It is used as a great way to stop crop disease and increase production.

2.What problems are caused by using chemical fertilizers? First, they damage the land by _______________________________________ chemical________________________________ for a long time. And it affects _____and _____ __________,since it __________ the crops and cannot be _________ ; these chemicals in the food supply ________ in the bodies, _________ cancers or other diseases. Fruit and other food with chemical grow too fast to _____________________ having more ______ than ________________________ killing the helpful bacteria and pests as well as the harmful ones. stay in the ground and underground water crops and humans animals get insides washed off build up leading to be full of much nutrition water vitamins and minerals

3.What is organic farming? Organic farming is farming without using chemical fertilizers. They focus on keeping their soil rich and free of disease. A healthy soil reduces disease and helps crops grow strong and healthy.

Organic farming Crops growing with natural rather than chemical fertilizer Natural waste from animals Make the soil richer in minerals and more fertile A healthy soil Reduce diseases in crops Help crops grow strong and healthy

Change the kind of crop in each field every few years. Farmers grow peas or soybeans after corn or wheat so that peas and beans can put minerals back into the soil, making it rich and healthy and ready to grow more wheat or corn. Farmers plant crops to use different levels of soil. And prefer planting grass between crops. 4.How do organic farmers to keep the soil fertile?

Change crops every few years Corn,wheat Peas soybeans Put the minerals back into the soil, making it rich and healthy Crops that use the surface of the soil (peanuts) Crops that need a deeper level of soil (vegetable) Planting grass to prevent wind or water from carrying away the soil and leave it in the ground to become a natural fertilizer for the next year’s crop

Retelling ( 8ms ) Retell the text according to the chart:Organic farming I.Crops growing with natural fertilizers. II.Farmers prefer natural waste from animals. Natural fertilizer Chemical fertilizer 1.make…richer and more fertile 2.reduce…and help…strong 3.the fertilizers kill…and healthy 4.keep free…from chemicals 1.leaving…is not good 2.grow…year after year III.Farmers change crops every two or three years. …to make sure what is left …