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1、helpscropsgrowstrongandhealthy.Organicfarmers,therefore,oftenpreferusingnaturalwastefromanimalsasfertilizer.Theyfeelthatthismakesthesoilintheirfieldsricherinmineralsandsomorefertile.Thisalsokeepstheair,soil,waterandcropsfreefromchemicals. Organicfarmersalso
2、usemanyothermethodstokeepthesoilfertile.Theyoftenchangethekndofcropineachfieldeveryfewyears,forexample,growingcornorwheatandthenthenextyearpeasorsoybeans.Cropssuchaspeasorsoybeansputimportantmineralsbackintothesoil,makingitreadyforcropssuchaswheatorcornthat
3、needrichandfertilesoil.Organicfarmersalsoplantcropstousedifferentlevelsofsoil,forexample,plantingpeanutsthatusetheground’ssurfacefollowedbyvegetablesthatputdowndeeproots.Someorganicfarmerspreferplantinggrassbetweencropstopreventwindorwaterfromcarryingawayth
4、esoil,andthenleavingitinthegroundtobecomeanaturalfertilizerforthenextyear’scrop.Thesemanydifferentorganicfarmingmethodshavethesamegoal:togrowgoodfoodandavoiddamagingtheenvironmentorpeople’shealth. Anearlyfarmerpioneer SomepeoplethoughtJiaSixiewasaluckyman.
5、Hehadworkedfortheemperorandwhenhegotold,hewasabletogohishometowntorelax.JiaSixie,however,hadotherplans.HehadalwaysbeeninterestedinagricultureandintendedtodosomethingtomakeChinesefarmingevenbetter. JiaSixielivedinthesixcenturyAD.HewasborninYiduinShandongprov
6、inceandworkedinGaoyang,whichisalsoinShangdong.Asherodethroughthecountrysideonhisjourneysforhisworkhelookedoutatthefields.Someofthemweregreenerandhadmorecropsthanothers.Somecowsandsheeplookedhealthierthanotherstoo.Hewaslostinthough.Whatcouldafarmerdotogetgoo
7、dcropsfromhisfields?Surelytheremustberulesthatwouldhelpthem.Hethoughthecouldusehisknowledgetofindoutthebestwaysforfarmerstogrowcropsandthenwriteabooktohelpthem.Indoingsohecollectedinformationfromfarmerswhodidwell,studieditanddidexperimentstofindthebestway.
8、Forexample,hestudiedwaysofkeepingseedsandadvisedfarmerstochooseseed-headswhichhadthebestcolor.Thenhetoldthemtohangthemtodryallwinter.Thenextspringtheseedsshouldbeknockedoutoftheirseed-headsandplanted.H
