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1、观赏植物的矿质营养铁缺乏症状铁与镁的毒害孔雀草万寿菊高EC和低pH高EC和低pH观赏植物正常生长发育所必需的9种大量营养元素(碳、氢、氧、氮、磷、钾、钙、镁、硫)占其生物干重的93％以上；7种微量元素(铁、锰、硼、铜、锌、钼、氯)虽含量很少，仅占百万分之几到十万分之几但却是不可或缺的。其中除氢、氧来自于水，碳来自大气外，其他元素主要来自于土壤(基质或营养水)。氮:1.Nitrogenisapartofalllivingcellsandisanecessarypartofallproteins,enzymesandmetabolicprocessesinvolvedinth
2、esynthesisandtransferofenergy. 2.Nitrogenisapartofchlorophyll,thegreenpigmentoftheplantthatisresponsibleforphotosynthesis. 3.Helpsplantswithrapidgrowth,increasingseedandfruitproductionandimprovingthequalityofleafandforagecrops. 4.Nitrogenoftencomesfromfertilizerapplicationandfromtheair(
3、legumesgettheirNfromtheatmosphere,waterorrainfallcontributesverylittlenitrogen)磷1.Likenitrogen,phosphorus(P)isanessentialpartoftheprocessofphotosynthesis. 2.Involvedintheformationofalloils,sugars,starches,etc. 3.Helpswiththetransformationofsolarenergyintochemicalenergy;properplantmaturat
4、ion;withstandingstress.Effectsrapidgrowth. 4.Encouragesbloomingandrootgrowth. 5.Phosphorusoftencomesfromfertilizer,bonemeal,andsuperphosphate.钾1.Potassiumisabsorbedbyplantsinlargeramountsthananyothermineralelementexceptnitrogenand,insomecases,calcium. 2.Helpsinthebuildingofprotein,photos
5、ynthesis,fruitqualityandreductionofdiseases 3.Involvedinregulatoryprocess,i.e.stomatalopening钙1.Calcium,anessentialpartofplantcellwallstructure,providesfornormaltransportandretentionofotherelementsaswellasstrengthintheplant. 2.Itisalsothoughttocounteracttheeffectofalkalisaltsandorganicaci
6、dswithinaplant. 3.Sourcesofcalciumaredolomiticlime,gypsum,andsuperphosphate.镁Magnesiumispartofthechlorophyllinallgreenplantsandessentialforphotosynthesis.Italsohelpsactivatemanyplantenzymesneededforgrowth.硫1.Essentialplantfoodforproductionofprotein. 2.Promotesactivityanddevelopmentofenzy
7、mesandvitamins. 3.Helpsinchlorophyllformation. 4.Improvesrootgrowthandseedproduction. Helpswithvigorousplantgrowthandresistancetocold.硼1.Helpsintheuseofnutrientsandregulatesothernutrients. 2.Aidsproductionofsugarandcarbohydrates. Essentialforseedandfruitdevelopmen
