02462naa a2200289 a 450000100080000000500110000800800410001902400270006010000170008724501220010426000090022650001000023552014720033565000090180765000100181665300220182665300310184865300210187965300330190065300190193365300320195270000160198470000170200070000170201770000170203477301210205110602012020-09-21       2019    bl uuuu     u00u1 u    #d7 a10.1111/sum.124952DOI1 aGRAHMANN, K.  a15N Fertilizer recovery in different tillage-straw systems on a Vertisol in north-west Mexico.h[electronic resource]  c2019  aArticle history: Received: 10 June 2018 | Revised: 12 January 2019 | Accepted: 21 January 2019.  aAbstractTillage and residue retention affect nitrogen (N) dynamics and nutrient losses and therefore nitrogen use efficiency (NUE) and crop fertilizer use, however, there is little  information  about  residual  fertilizer  effects  on  the  subsequent  crop.  Micro-  plots with 15N- labelled urea were established in 2014/2015 on a long- term experi-ment  on  a  Vertisol  in  north-  west  Mexico.  N  fertilizer  recovery  (NFR)  and  the  effects of residual fertilizer N for summer maize (Zea mays L.) and the subsequent wheat  (Triticum  durum  L.)  crop  were  studied  in  three  tillage?straw  management  practices (CTB: conventionally tilled beds; PB- straw: permanent raised beds with residue retention; PB- burn: permanent raised beds with residue burning). Fertilizer 15N recovery rates for maize grain across all treatments were low with an average of 11%, but after wheat harvest total recovered 15N (15N in maize and wheat straw and  grain,  residual  soil  15N)  was  over  50%  for  the  PB-  burn  treatment.  NFR  was  lowest in CTB after two cropping cycles (32%). Unaccounted N from applied fer-tilizer for the maize crop averaged 120 kg 15N ha?1 after wheat harvest. However, more than 20% of labelled 15N was found in the 0?90 cm soil profile in both PB treatments after wheat harvest, which highlights the need for long- term studies and continuous monitoring of the soil nutrient status to avoid over- application of min-eral N fertilizer.  aMAIZ  aTRIGO  a15N LABELLED UREA  aFERTILIZANTES NITROGENADOS  aNITROGEN BALANCE  aNITROGEN FERTILIZER RECOVERY  aPERMANENT BEDS  aWHEAT-MAIZE CROPPING SYSTEM1 aDITTERT, K.1 aVERHULST, N.1 aGOVAERTS, B.1 aBUERKERT, A.  tSoil Use and Management, 1 September 2019, Volume 35, Issue 3, Pages 482-491. Doi: https://doi.org/10.1111/sum.12495