Navegando por Autor "Gratão, Priscila Lupino"

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    Simple procedure for nutrient analysis of coffee plant with energy dispersive X-ray fluorescence spectrometry (EDXRF)
    (Escola Superior de Agricultura "Luiz de Queiroz", 2013-07) Tezotto, Tiago; Favarin, José Laércio; Paula Neto, Ana; Gratão, Priscila Lupino; Azevedo, Ricardo Antunes; Mazzafera, Paulo
    Nutrient analysis is used to estimate nutrient content of crop plants to manage fertilizer application for sustained crop production. Direct solid analysis of agricultural and envi- ronmental samples by energy dispersive X-ray fluorescence spectrometry (EDXRF) was chosen as alternative technique to evaluate the simultaneous multielemental quantification of the most important essential elements in coffee (Coffea arabica L.) plants. Inductively coupled plasma atomic emission spectrometry and certified reference materials made from leaves were used to calibrate and check the trueness of EDXRF method for the determination of the concentration of several nutrients in coffee leaves and branches. Fluorescence spectrometry proved to be ad- vantageous and presented low cost as loose powder samples could be used. Samples collected from a field experiment where coffee plants were treated with excess of Ni and Zn were used to verify the practical application of the method. Good relationships were achieved between certi- fied values and data obtained by EDXRF, with recoveries ranging from 82 to 117 %.