The physiological effects of fungicides are broad and not yet fully clarified, little information is available in the scientific environment on their effect on nutrient absorption. The present work aimed to evaluate the leaf nutritional content of K, P, N and C total in soybean plants in the reproductive stage due to the application of fungicides and the effect of these products on crop grain yield. The experiment was conducted in the experimental area of the Federal University of Tocantins, Gurupi campus, in the agricultural year 2018/2019. Foi utilizada a cultivar JURUENA IPRO 84185 RSFwas used. The experiment was conducted in BCD, with four replications and treatments consisting of one control (without application) and nine fungicides: Piraclostrobin + Epoxiconazol + Fluxapiroxade; Fluxapiroxade + Prothioconazol; Chlorothalonil; Carbendazim; Benzovindiflupir + Ciproconazol + Difenoconazol; Bixafen + Prothioconazole + Trifloxistrobina; Fluxapiroxade + Copper oxychloride; Dimoxistrobin + Boscalida; Azoxistrobin + Tebuconazol + Mancozebe. Featuring a factorial experiment 10x3 (9 fungicides + a witness without application x 3 application times). The applications of the products occurred 50, 64 and 78 days after emergence. The samples were collected after the application of the products, in three seasons of the reproductive stage, being the first collection in R1, the second in R3 and the third in R5. Fungicide applications are considered to provide plants with an increase in leaf levels of N, P and K from stage R1 to R3, but in R5 there was a reduction in these elements. The effect of fungicides had a lower influence on the percentage of C over time. Fungicides Chlorothalonil and Fluxapiroxade+Prothioconazole showed the highest means of productivity.
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