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
<p> jø×,÷2ÄF×,÷ æ¿ðb Ö÷ Æ7 æ¿ v 3É,ir Ìâ/îê 。Vh Ìâê ¥ In, 3 ¡VñÏ RÑV300kg/hm2。3.4 Íö1 1r 1 &¥ ¦¹ g, ïÐr (ɹ、c £ 、g ïHq©)µv1“。 ô ¥r ,y ë 3Á 、 ÖÉ#r Ì(下转第 48页)45 4 ù äÍ l,çÑ ¾, > i©.r bÄQbÄT¨#Yy ÍùîÉZJ. ¹+ ß,©.15N U6/ A¹ Í 3þ¹ oÄÐVñùîÏ¥¨ÉZJ.¹ Ø SÐ,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)âÐg¨ &shy;W1“ ,h r Ìâê ¥ -4/ÙªF,4Ú 3¥Á Ð ÖÉε¿ÉB¥ùî。 IÓD:1f £,f6 Ü. vb Ö÷c Ð g1“¥ùîÀ J.Zó, 2002,(1):9 10.2Ƚ ù,ñ¼£. ÿ ÍC 3É?â¥YJ.ÏS , 2006,(2):5051. 3 äl. £ ܲâÁ ÖÉ¥YJ.r g , 2005(4):1113. 4¦ô, Ùö, Ù ,©.g、r g ï l ùlâ8 =b Ö÷c ¥YJ.ÏS j¨ .µíg ¥ vr b Ö÷c ¥YJ.µ 2 jy<,± ü,¦¹¿,©.Yðb Ö÷ Æ¥y ÍsJ. öêyýýñÐý,2006,21(1):46 49.48 j < Ð 19 </p>