现代农业课件
日期：2010-09-22 09:55
Whataretheadvantagesanddisadvantagesofeachway?3，Whataretheadvantagesanddisadvantagesofeachway?3，theuseofchemicalfertilizers，Whatotherchangeshavehappenedonfarmsinthelast100years?Overthelast100yearstherehavebeensomechangesonfarmsandinagriculture:Theuseofmachines，growingdifferentcrops，doingtheworkwithworkerswhoarenotpartoffamily，thegrowthofthefarms(biggerfarms)，Whatotherchangeshavehappenedonfarmsinthelast100years?Traditionalfarming---?AgricultureModernfarming---??Hi-techfarming---TraditionalfarmingModernfarmingHi-techfarmingAdvantagesDisadvantages1，theuseofinsectkillers，Lookatthepicturesandcomparetraditionalandmodernfarming2，Unit19ModernAgricultureagriculturefarmirrigationfoodcropfieldplantsplainfarminggrainfarmerfertilizerseedprairiecountrysidelandarablelandDiscussthefollowingquestionswithyoupartner1，theuseoffoodsupplementsinanimalfeed，etcHowmanyfirstdoweChinesehaveinthehistoryofagriculture??Scanning:，
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