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
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 、 ÖÉr Ì下转第 48页45 4 ù äÍ l,çÑ ¾, i©.r bÄQbÄT¨Yy ÍùîÉZ[J]. ¹ ß,©.15N U6/ A¹ Í 3þ¹ oÄÐVñùîÏ¥¨ÉZ[J].¹ Ø SÐ,2005,25618~20.[26] IngwersenJ, Butterbach-BahlK, GascheR, RichterO.Baro-metricprocessseparationnewforquantifyingnitrifica-tion, denitrification, andnitrousoxidesourcesinsoil[J].SoilScienceSocietyofAmericaJournal,1999,63117~128.[27] BreuerL, KieseR, Butterbach-BahlK.Temperatureandmoistureefectsonnitrificationratesintropicalrainforestsoils.SoilScienceSocietyofAmericaJournal, 2002,66834~844.[28] KieseR, PapenH, ZumbuschE, Butterbach-BahlK.Nitrifi-cationactivityintropicalrainforestsoilsoftheCoastalLowlandsandAthertonTablelands, Queensland, Australia[J].JournalofPlantNutritionandSoilScience, 2002,165682~ 685.上接第45页âÐg¨ shy;W1“ ,h r Ìâê ¥ -4/ÙªF,4Ú 3¥Á Ð ÖÉε¿ÉB¥ùî。 IÓD[1]f £,f6 Ü. vb Ö÷c Ð g1“¥ùîÀ [J].Zó\, 2002,19~ 10.[2]Ƚ ù,ñ¼£.] ÿ ÍC 3Éâ¥Y[J].ÏS , 2006,250~51.[ 3] äl.] £ ܲâÁ ÖÉ¥Y[J].r g , 2005411~13.[ 4]¦ô, Ùö, Ù ,©.g、r g ï l ùlâ8 b Ö÷c ¥Y[J].ÏS j¨ .µíg ¥ vr b Ö÷c ¥Y[J].µ 2 jy,± ü,¦¹¿,©.Yðb Ö÷ Æ¥y Ís[J]. öêyýýñÐý,2006,21146~ 49.48 j Ð 19