氮肥施用量对生菜产量、硝酸盐积累及土壤EC值、pH值的影响

j,2F, b 7 v 3,ir / 。Vh In, 3 V RV300kg/hm2。3.4 1 1r 1 & g, r (、c 、g Hq)v1“。  r ,y 3 、 #r (下转第 48页)45 4         l, , > i.r bQbT#Yy ZJ. + ,.15N U6/ A 3 oVZJ. S,2005,25(6):1820.26 IngwersenJ, Butterbach-BahlK, GascheR, RichterO.Baro-metricprocessseparation:newmethodforquantifyingnitrifica-tion, denitrification, andnitrousoxidesourcesinsoilJ.SoilScienceSocietyofAmericaJournal,1999,(63):117128.27 BreuerL, KieseR, Butterbach-BahlK.Temperatureandmoistureefectsonnitrificationratesintropicalrainforestsoils.SoilScienceSocietyofAmericaJournal, 2002,(66):834844.28 KieseR, PapenH, ZumbuschE, Butterbach-BahlK.Nitrifi-cationactivityintropicalrainforestsoilsoftheCoastalLowlandsandAthertonTablelands, Queensland, AustraliaJ.JournalofPlantNutritionandSoilScience, 2002,(165):682 685.(上接第45页)g &shy;W1“ ,h r -4/F,4 3 B。 ID:1f ,f6 . vb c g1“ J.Z, 2002,(1):9 10.2 ,. C 3?YJ.S , 2006,(2):5051. 3 l. YJ.r g , 2005(4):1113. 4, , ,.g、r g l l8 =b c YJ.S j .g vr b c YJ. 2 jy<, ,.Yb y sJ. y,2006,21(1):46 49.48  j <                   19