Unit 2 Working the land Period 4 making good use of the land developing the technology to planting a new kind of food improving the quality of the soil preventing the pests from eating our crops If you were a farmer, what would you do to improve the condition? How to improve...? Using technology to improve output In great need of food A hungry child A hand of a hungry boy Hunger is a serious problem in the world. Many people even starve to death in Africa. If you had the chance to do one thing to help end hunger in the world, what would you do? prevent the pests from eating our crops improve the quality of the soil develop the technology make good use of the waste land invent a new kind of plant A Poem By Li Shen Farmers weeding at noon, Sweat down the field soon. Who knows food on a tray, Due to their toiling day. What do we put on the soil to makecrops grow ? It is fertilizer. How many kinds of fertilizers do farmers use ? There are two kinds. They are chemical fertilizers and natural ones. Which kind do farmers use when they are doing organic farming ? Which kind do farmers use when they are doing organic farming ? Do you know about organic farming ? Do you know about organic farming ? 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. 4 What is the main reason for using organic farming methods? The main reason for using organic farming methods is to grow good food and to avoid damaging the environment or peoples health. Methods of organic farming Advantages of methods 1 Farmers use natural waste from animals. 1 This makes the soil richer in minerals and so more fertile. 2 Farmers often change the kind of crop in each field every few years. 2 Changing the crops renews the minerals in the soil and helps it become rich and healthy. Methods of organic farming Advantages of methods 3 Farmers plant crops with different lengths of roots. 3 This uses different levels of soil. 4 Farmers sometimes plant grass between crops and leave it in the ground. 4 This prevents wind or water from carrying away soil and acts as a natural fertilizer. 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 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 years crop Language points 1 These chemicals in the food supply build up in peoples bodies over time. build up ; Hard working conditions build up character. 2 Many of these chemicals can lead to cancer or other illnesses. lead to: Too much work and too little rest often lead to illness. All roads lead to Rome. 3 They focus on keeping their soil rich and free of disease. focus on sth/doing sth: ( You should focus your attention on your work. 4 This also keeps the air, soil, water and crops free from chemicals. keeps free from /of: keep from: ; I hope you will keep from doing anything rash. supply. 1) a) ; , demand ( ) supply and demand be in short supply , food supply water supply 5. food supply. b) ; ; , supplies military supplies household supplies medical supplies 2) , , , , supply sb. (with) sth supply sth. to /for sb -- They supplied food to/for them. -- The library is well supplied with books. [ ] supply, provide afford supply provide , afford They provided the refugees food and medicine. These efforts afforded us useful experience. All the rooms are ___ with electric lights. A. supplied B. given C. offered D. burnt (2005