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1、 Book4 Unit 2 Using LanguageAChemical fertilizersBNatural fertilizersNatural waste from animals and dead plantsNow,which one do you prefer?ABIts a product of organic farming.AIts a product of chemical farming.BGoalsAfter reading,youll know:1.What is chemical farming?2.What is organic farming?3.The a
2、dvantages and disadvantages of them.Task1:Read and match the main idea of each paragraph.B.Effect of chemical fertilizers.D.Farmers and customers turn to organic farming.C.Other methods to keep the soil fertile.A.Problems caused by chemical fertilizers.P1.P2.P3.P4.Part 1(Para.1-2)Chemical farming Pa
3、rt 2(Para.3-4)Organic farmingDivide the text into two parts.？Task2:Para 1.Read and answer.n Why are chemical fertilizers so popular in farming today?Many farmers welcomed them as a great way to stop crop disease and increase production.Task3:Para.2 Read and fill the form.The problems caused by using
4、 chemical fertilizersHow1.Damaging the _:Killing the helpful _2.Damaging _:1.Many chemicals in the food supply can lead to _or_.2.Food grows too fast to be full of much _.bacteria and pestsnutritionlandpeoples healthcancer other illnessesTask4:Para.3 True or False1.Organic farming means farming with
5、out using any chemicals.2.Organic farmers prefer using fertilizers to make the soil richer in minerals.3.Farmers want to keep their soil fertile and free of disease.4.Organic farming would keep the air,soil,water free from chemicals.natural waste from animalsTTFTChanging the kind of crop in each fie
6、ld every few years.Planting crops with different lengths of roots1.To use different levels of soil.3.To renew the minerals in the soil and help it become rich.Planting grass between crops and leave it in the ground2.To prevent wind or water from carrying away soil and act as a natural fertilizer.Met
7、hods Purposes Task5 Para.4 Match each method with its purpose.problems cause1.Damage the _By killing the _2.Affect the _By staying in the _3.Lead to_By building up in_4.Fruit,vegetables and other food have less _By growing _Chemical farmingTask 6 Consolidation Methods Advantages 1.Use _ as fertilize
8、rsMake the soil _ in minerals and more _.2.Change the _of crops in each field every _ years.Put important _back into the soil,making it _ for other crops.3.plant_crops with _ roots,Use different _ of soil.4.Plant _ between crops and then _ it in the ground.Prevent _ from _and become a_.Organic farmi
9、ngAfter reading,please tell me:1.Is it chemical or organic farming?2.How do you know?Task 7 Thinking Situation 1:The farmer is using fertilizers to keep the vegetable free from pest.Chemical farmingSituation 2:Lao Wang grows soybeans in his field last year and grows corns this year.organic farmingGr
10、ow different crops every year.Situation 3:Lao Li throw the nitrogen fertilizer(氮肥氮肥)in his field to make his soil rich in minerals.Chemical farmingUse chemicals Situation 4:Li Hua only use natural fertilizers to grow his cabbage.Thats why his cabbage is damaged by pests.Organic farmingWhich kind of
11、farming do you support?Competition Lets find the advantages of Organic farming.Eg:Organic farming is good for peoples health.Organic farming can Who can find more?The advantages of Organic farmingEnvironmentally friendlyMake the soil fertileMake full use of soilDo no harm to peoples health.Cost little moneyCan be used for a long timeA stubborn farmers idea:Chemical Farming is better.Help crops grow fastKill pestIncrease productionStop crop diseaseEasy to useBecome effective in a short timeFind disadvantages of chemical farming to persuade the farmer.