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1、第二章植物的矿质和氮素营养（Thesecondchaptermineralandnitrogennutritionofplants）ThesecondchaptermineralandnitrogennutritionofplantsThereisnoincomebutwater."Theuptake,translocationandassimilationofmineralsaltsbyplantsarecalledmineralnutrition(mineralnutrition).Section1essen
2、tialmineralelementsinplantsAbsorptionofmineralelementsbysecondplantcellsAbsorptionofmineralelementsbythirdplantsTransportationanddistributionoffourthmineralelementsinplantsAssimilationofnitrogen,phosphorusandsulfurbyfifthplantsThephysiologicalbasisofsixthrati
3、onalfertilizationThesecondchaptermineralandnitrogennutritionofplantsSection1essentialelementsinplantsI.elementsinplantswaterdrymatterOrganiccompoundInorganicsubstancePlantbodyPlantmaterials105-110C,80C(10-30%)(drying)burningC:CO2H:H2OO:CO2,H2O,etc.N:N2,NH3,ni
4、trogenoxides,etc.S:SO2,H2SAshelement(ashelement)DrymattercombustionTheelementsthatmakeupasharecalledashelements,alsoknownasmineralelementsNisnotamineralelement.Indispensability:Irreplaceable:lackofspecificity,Directfunction:Two.Essentialmineralelementsofplant
5、sanddeterminationmethods(1)theconditionsofessentialelementsinplants(two)determinationmethodofessentialmineralelementsinplantsSolutionculturemethod(Solutionculturemethod)(referredtoaswater):in1860,foundedbyKnopandSachsSandculturemethod(sandculturemethod):Gascu
6、lturemethod(WuPeifa)A.method:Theuseofcontainers(orfoilwrappedinopaquecontainers),topreventlightandavoidthereproductionofalgae,andoftenventilation;nutrientsolutionB.film(nutrient)method:ThenutrientsolutionflowsfromthecontaineratotheshallowslotBthatgrowsintothe
7、plant,andtheabsorbednutrientsolutionflowsintothecontainerC,andtheDpumpreturnstothea.ThenutrientsolutionpHanditscomponentscanbecontrolled.ABCDC.gasculturemethod:therootissuspendedabovethenutrientsolution,andthenutrientsolutionisstirredintofog.Gascultivation(ae
8、roponics)methodAttentionshouldbepaidtosolutioncultureorsandbasedculture:1.solutionconcentrationshouldbeappropriate,ionconcentrationistoohigh,easytocauseharm;2.adjusttheappropriatepHvalue;
