plant chlorophyll meter, leaf sensor
Conversion of atLEAF units


atLEAF units to wheat N fertilizer/Protein



atLEAF+ value: N fertilizer (lb/acre) : N fertilizer (kg/ha) : Protein concentration % :



Wheat N fertilizer to atLEAF units

N fertilizer (lb/acre) : atLEAF+ value:

N fertilizer (kg/ha) : atLEAF+ value:


Wheat Protein concentration (%) to atLEAF units

Protein Concentration(%) : atLEAF+ value:


The conversions are obtained following:
  • 2013-2014 Research Report to the California Wheat Commission
    Calibrating In-field Diagnostic Tools to Improve Nitrogen Management for High Yield and High Protein Wheat in the Sacramento Valley
    PI: Mark Lundy, UC Cooperative Extension Agronomy Advisor


    • see also:
  • Presentation: In-field plant monitoring as a tool for N management in small grains
  • Proceedings: In-field plant monitoring as a tool for N management in small grains
  • Managing N fertilizer to optimize protein and yield in California wheat




    • atLEAF to SPAD units/Total chl



    atLEAF+ value: SPAD units : Total chl :
    mg/cm2



    The conversion to SPAD units is performed according to the calculations of Zhu, Tremblay, and Liang (9). The total chlorophyll content of leaves is obtained by converting the atLEAF+ values in SPAD and considering the relationship among chlorophyll content and SPAD units given by the following referenced authors (1)...(10).

    References
    (1) Richardson A.D., Duigan S.P., and Berlyn G.P., 2002. An evaluation of noninvasive methods to estimate foliar chlorophyll content. New Phytol. 153
    (2) Pinkard E.A., Patel V., and Mohammed C., 2006. Chlorophyll and nitrogen determination for plantation-grown Eucalyptus nitens and E. globulus using a non-destructive meter. For. Ecol.Manage. 223
    (3) Schaper H. and Chacko E.K., 1991. Relation between extractable chlorophyll and portable chlorophyll meter readings in leaves of eight tropical and subtropical fruit tree species. J. Plant Physiol. 138
    (4) Monje O.A. and Bugbee B., 1992. Inherent limitations of nondestructive chlorophyll meters - a comparison of 2 types of meters. Hortscience 27
    (5) Uddling J., Gelang-Alfredsson J., Piikki K., and Pleijel H., 2007. Evaluating the relationship between leaf chlorophyll concentration and SPAD-502 chlorophyll meter readings. Photosynth. Res. 91
    (6) Murillo-Amador B., Avila-Serrano N.Y., Garcia-Hernandez J.L., Lopez-Aguilar R., Troyo-Dieguez E., and Kaya C., 2004. Relationship between a nondestructive and an extraction method for measuring chlorophyll contents in cowpea leaves. J. Plant Nutr. Soil Sc. 167
    (7) Coste S., Baraloto C., Leroy C., Marcon É., Renaud A., Richardson A.D., Roggy J.C., Schimann H., Uddling J., Hérault B. 2010 Assessing foliar chlorophyll contents with the SPAD-502 chlorophyll meter: a calibration test with thirteen tree species of tropical rainforest in French Guiana. Ann. For. Sci. 67
    (8) Ruiz-Espinoza F.H., Murillo-Amador B., García-Hernández J.L., Fenech-Larios L.; Rueda-Puente E.O.; Troyo-Diéguez E., Kaya C., Beltrán-Morales A. 2010 Field evaluation of the relationship between Chlorophyll content in basil leaves and a portable Chlorophyll meter (spad-502) readings Journal of Plant Nutrition x
    (9) Zhu J., Tremblay T., and Liang Y. 2012 Comparing SPAD and atLEAF values for chlorophyll assessment in crop species Can. J. Soil Sci. 92
    (10) Richardson A.D. , Duigan S.P. and Berlyn G. P. 2002 An evaluation of noninvasive methods to estimate foliar chlorophyll content New Phytologist 153

    We cannot guarantee the validity of conversions provided or be held responsible for any errors that have been made.