优质课课件M4U2-chemical-or-organic-farming

Chemicalororganicfarming?Guessthemainideaofthepassage?Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.Para1Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.Para1Why?Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.Para1Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.Para1Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.Recently,however,Para1Overthepasthalfcentury,usingchemicalfertilizershasbecomeverycommoninfarming.Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.Recently,however,scientistshavebeenfindingthatlong-termuseofthesefertilizerscancausedamagetothelandand,evenmoredangerous,topeople’shealth.Para1Why?Whataresomeoftheproblemscausedbychemicalfertilizers?Firstalsodamagethelandbystayingroundandundergroundwatergetinsidethecropsleadtocancerorotherillnesses.InadditiongrowtoofasttobefullofmuchnutritionPara2buildupinpeople’sbodiesHowtosolvetheproblem?Withthesediscoveries,somefarmersandmanycustomersarebeginningtoturntoorganicfarming.Para3Withthesediscoveries,somefarmersandmanycustomersarebeginningtoturntoorganicfarming.Whatisorganicfarming?Para3Withthesediscoveries,somefarmersandmanycustomersarebeginningtoturntoorganicfarming.farmingwithoutusinganychemicals.focusonkeepingtheirsoilrichandfreeofdisease.Organicfarmers,therefore,oftenpreferusingnaturalwastefromanimalsasfertilizer.Para3Howdofarmersdo?berichin…keepfreefromusingnaturalwastefromanimalsasfertilizer.Para3:Para4:berichin…keepfreefromOrganicfarmersalsousemanyothermethodstokeepthesoilfertile.Howdofarmersdo?usingnaturalwastefromanimalsasfertilizer.Para3:Para4:berichin…keepfreefromothermethods:Howdofarmersdo?changethekindofcropineachfieldeveryfewyearsalsoplantcropstousedifferentlevelsofsoilplantinggrassbetweencropsforexample,forexample,prevent…fromusingnaturalwastefromanimalsasfertilizer.Para3:Para4:berichin…keepfreefromothermethods:changethekindofcropineachfieldeveryfewyearsalsoplantcropstousedifferentlevelsofsoilplantinggrassbetweencropsforexample,forexample,prevent…fromOrganicfarmingmethodshavethesamegoal:togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealth.Para1Whataresomeoftheproblemscausedbychemicalfertilizers?Para2Para3Para4OrganicfarmingmethodsIntroducethetopicChemicalororganicfarming?causeproblemsfarmerspreferit