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1、重点句子第一课6.Thebasicparts（主要器官）ofaplantaretherootsystem（茎叶系统），whichisbelowtheground,andtheshootsystemabove.8.Ittakesin,orabsorbs,waterandmineralsfromthesoilthroughtheroothairs,whicharesinglecellsnearthetipofeachroot.根系可以通过根尖端附近的简单细胞一根毛从土壤中吸收水分和矿物质12.Inaddition,plantssuchasclover（三叶草）andLucerne（苜蓿）,know
2、naslegumes（豆科作物）,havespecialbacteriawhichliveontheroots.18.Anotherimportantfunctionistoenablewaterandmineralstopassup（向上）fromtheleavesandflowers.21.Theirmainjobistomakefoodfortheplantbytheprocessknownasphotosynthesis/光合作用）23.Waterfromthesoilandcarbondioxidefromtheairareconvertedint。（转化成）sugarsandoth
3、ercarbohydrates.26.TheStamenS（雄蕊）producethemalesexcells（雄性抱子），orspermatic,whicharecarriedinthepollengrains（花粉粒）28.Thefruittheripenedovary（成熟子房）oftheflower,encloses（包围）theseedsandprotectsthemwhiletheyaredeveloping.29.Theseeditselfconsistsofanembryo（胚）andfoodstore（胚乳）.30.Theembryoisthepartwhichwilldev
4、elopintoanotherplantandfoodstoreisnecessarytoprovidenourishmentfortheyoungplantwhileitisgrowing.（胚乳在幼苗生长过程中提供必需的养分）第二课3.Seedsremaindormant（休眠的），orinarestingstate,iftheyarekeptcoolanddry.4.Whentheamountofmoisture（湿度）andthetemperaturelevelareright,theseedsgerminate（发芽）andstartgrowing.13.Thisisbecausew
5、etsoilsremaincoldforalongerperiodoftimethandrier;well-drained（排水很好的）soils.16.Dormantseedsrequireverylittleoxygeninordertostayalive,butwhentheystarttogerminatetheyrequiremore.20.Intheearlystagesofdevelopmenttheseedingdependsentirelyonthefoodstore（阻:乳）intheseedbutassoonasthefirstleavesareproduced,itis
6、abletomanufacturefoodforitself.25.lntheprocessofpollination（传播花粉）thepollen（花粉）iscarriedbywindorinsectsfromthestamenstothestigmaoftheCarPel（心皮）.26.ltgerminates（发芽）ontheStigma（柱头）andgrowthestyleintotheOVary（子房），wherefertilization（受精）takesplace.第三课2.OrganicmaterialOriginateS（来自于）fromdeadplantsandanimal
7、sandmaterialsotherthan（与什么不同）thisarederived（起源）fromrocksofvariouskinds.3.Theserocksarebrokendownintosmallparticles（颗粒）bymechanical（机械的）disintegration（分解）andchemicaldecomposition（分解）.6.Inarid（干旱的）regionsWeathering（风化）ismostlybyphysicalmeans.7.Butinhumid（潮湿的）regionchemicalprocessesofweatheringareequal
8、ly（同等的）important.!1.Consequently（从而，因此），theinsoluble（难以溶解的）mineral（矿物的）residues（残余物）inthesoilshavelessresemblance（相似）totheoriginalrocks.22.Mostofthemcontainvariousproportion（比例）ofsandzsilt（粉砂）andclay（粘土）andthesevaryingproportionsmakeupasoilwstextural（质地的）class.23.Theprincipleclassesinorderof（依照,的次序,
9、increasingfineness（细度,纯度）ofmaterialaresand（砂）/loamysand（壤砂土）zloam（壤土）,siltloam（粉砂壤土）,siltyclayloam（粉砂粘壤土）,Clayloam（粘壤土），siltandclay.28.Thatistosay,smallersizedparticles（颗粒）canreactorcombinewithwateonutrientsandhumus（腐殖质）moreeasilythanlargersizedparticles.30.Humusfromdecomposed（分解，腐烂）organicmatterisv
10、italtoasoilasitmakesaheavysoil（粘重土）lighter.第四课2,Theease（容易）withwhichwatercanpassthrough（通过）asoildependson（取决于Otheproportionsinitofcoarse（粗糙的）andfine（精细的）particlessuchassandandclay（粘t）.10.Anotheradvantageisthatawell-drainedsoilwillhaveenoughairforaerobic（好氧的）bacteriatobreakdownhumusandsoprovidefoodfo
11、rtheplant.12.Ditches（沟）canbecutatcertainintervals（间隔）betweenthecrops.16.Porous（多孔的）drainagetiles（排水瓦罐）maybelaidinoronthelandandthesewillhelptodrawoff（放掉）theSUrPlUS（过乘IJ）Warer.22.Weshoulddistinguishbetweenthecollectionofwater（蓄水）anditsapplication（应用）.23.Therearetwomainsourcesofirrigationwater:surface
12、waterandgroundwater.31.Bythiswemeantheamountofwaterwhichisneededtobringthesoiltofullcapacity（达到充分的容量）32.ltalsodependsonthetypeofcrop,thestageofgrowthoftheamountwhichitwilluseatthatparticulartime.34.Mostplantsrequirelargerquantitiesofwaterduringthelaterstagesthanintheearlierstages.第五课8.Finally,itmake
13、supfortheplantnutrientswhichhavebeenremovedbycropsorlostbyleaching（淋溶）andsoilerosion（土壤侵蚀）.14.So,theymaybegroupedasnitrogenousfertilizers,phosphaticfertilizers,potassicfertilizers（KDE）andsoon.15.Themostcommonlyusedfertilizerwhichcontainsnitrogenisammonium（）sulphate（硫酸盐），whichismadefromammoniaandsulp
14、huricacid,andwhichcontains21%nitrohen（N）16.Thiselementencouragesrapidvegetative（植物的，生长的）growthandgivesplantsahealthygreencolour.19.Phosphorous（P）stimulates（促进）theformation（形成）ofaplantsroots,andpromotes（促进）fruitandseedproduction.21.Finally,whereverhighcropyields（产量）areexpected,potash（K）isusedtogether
15、withnitrogenandphosphorous.23.Thishelpsplanttowithstand（抵抗mechanicaldamage（机械伤害）suchasbrokenbranchesandtornleaves.27.ltisusuallysuppliedintheformofmuriateofPOtaSh（氯化钾）,whichcontains50to60%potassiumoxide（k2o）andsulphateofpotash（硫酸钾）.32.Ifasoilisveryacid（酸的）zwithaPHvalueoflessthan5.0zlimecanbeaddedtoc
16、orrectthisacidity（酸性）.35.Nitrogen,phosphorousandpotassiumaremoreeasilyavailableinawell-limed（用石灰处理好的soilthaninanacidsoil.第六课l.lncropproductionthecontrolofweeds,diseasesandpestsisessentialtoobtainhighyields（获得高产）.5.Weedsreducecropyieldsonaccountofthefactthattheycompetewithcropsforwater,soilnutrientsandlight.7.Mostweedsareaggressive（侵袭性的）andinvasive（侵害的），theygrowquicklyandspreadfar,andsoaredifficulttogetridof.ll.Weedsmayalsobekilledbymeansofchemicalswhichhavethecollectivenameof
