Abstract
A portable energy dispersive X-ray fluorescence spectrometer was evaluated in the in situ analysis of fresh sugar cane leaves for real time plant nutrition diagnosis. Fresh leaf fragments (n = 10 sugar cane varieties; 20 fragments per leaf; 2 measurement sites per fragment) were irradiated and the averaged data from X-ray characteristic emission lines intensities (for K, Ca, S and Si Kα lines) were in close agreement with mass fraction data obtained by a validated comparative method. The linear correlation coefficients (r) ranged from 0.9575 for Ca to 0.9851 for Si. The obtained limits of detection were at least two-fold lower than the critical nutrient levels. Manganese can also be properly determined, but validation still requires more robust calibration models. The proposed method is a straightforward approach towards the fast evaluation of the nutritional profile of plants avoiding time-consuming steps, which involve drying, grinding, weighing, and acid digestion.
Highlights
Plant nutrition diagnosis is a well-established and reliable way for guiding the proper fertilizer recommendation contributing to the healthy growing of crops of economic importance.[1]
Some studies have focused on the use of the direct solid sampling analysis based on X-ray fluorescence spectrometry (XRF),[3,4,5] laser-induced breakdown spectroscopy (LIBS)[6,7,8] or laser ablation inductively coupled plasma mass
The initial evaluation of handheld energy dispersive XRF (EDXRF) for the in situ analysis of fresh plant leaves was conducted by a qualitative screening in several sugar cane varieties in order to provide insights for the subsequent quantitative analysis
Summary
Plant nutrition diagnosis is a well-established and reliable way for guiding the proper fertilizer recommendation contributing to the healthy growing of crops of economic importance.[1]. It is evaluated the feasibility of the in situ analysis of fresh leaves of sugar cane, an important cash crop of the tropical regions, aiming at nutrition diagnosis using a portable, handheld EDXRF equipment.
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