PERFORMANCE OF DUALEX IN SPRING WHEAT FOR CROP NITROGEN STATUS ASSESSMENT, YIELD PREDICTION AND ESTIMATION OF SOIL NITRATE CONTENT
2009; Taylor & Francis; Volume: 33; Issue: 1 Linguagem: Inglês
10.1080/01904160903391081
ISSN1532-4087
AutoresNicolas Tremblay, Zhijie Wang, C. Bélec,
Tópico(s)Soil Geostatistics and Mapping
ResumoAbstract Dualex and SPAD are devices developed for the purpose of testing crop nitrogen (N) status. These instruments were used in a wheat experiment in order to compare their respective performance in assessing leaf nitrogen (N) concentration, response to N topdressing application, soil nitrate (NO3)-N levels and in predicting grain yield. The experiment included different N rates in 2005 and 2006 in the Montérégie region of Quebec, Canada. Dualex readings correlated negatively with SPAD readings, leaf N concentration, soil NO3-N content and wheat grain yield. SPAD alone and the ratio of SPAD to Dualex measurements (Chl/Phen) were linearly related to N application rate but no effect of N application rate was found for individual Dualex parameters. However, both SPAD and Dualex readings were affected by year effects. The Dualex was also capable of indirect evaluation of in-season soil NO3-N accumulation and the prediction of wheat yield, but more so as Chl/Phen. Keywords: SPADDualexnitrogen statussoil NO3-Ngrain yield ACKNOWLEDGMENTS The authors would like to thank Edith Fallon, Marcel Tétreault, Noura Ziadi, Konkordia Enr. Farm, Martel's Farm, the L’Acadie Experimental Farm and the summer student crew. This work was supported by the GAPS program of Agriculture and Agri-Food Canada. Notes ** indicate significance at 1% levels. *** and NS indicate significant effects at 0.1% levels and non-significant, respectively.
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