FUNGICIDAS SISTÊMICOS E DE CONTATO APLICADOS EM SOJA E SUA RELAÇÃO COM A FITOSSANIDADE À CAMPO

Abstract

Numerous are biotic agents that cause damage to the aerial part that have synergism with a fungicide application. The objective of this dissertation was to evaluate the effect of systemic and contact fungicides applied in soybean and its relation in field phytosanitary together with morphoagronomic aspects. The soybean cultivar Brasmax Desafio RR (8473RSF) was used, being evaluated the impact on the complex of diseases by fungicides in four treatments (T1. Witness, T2. 1st Applic. Trifloxistrobine+protioconazole e mancozeb, 2st Applic. picoxistrobin+ciproconazole, 3rd Applic. azoxistrobin+benzovindiflupir; T3. 1st Applic. azoxistrobin+benzovindiflupir e difenoconazole+ciproconazole, 2nd Applic. difenoconazole+ciproconazole e mancozeb; T4. 1st Applic. azoxistrobin+benzovindiflupir and mineral oil, 2nd Applic. azoxistrobin+benzovindiflupir and mineral oil, 3rd Applic. difenoconazole+ciproconazole e mancozeb; T5. 1a Applic. azoxistrobine+benzovindiflupir and difenoconazole+ciproconazole, 2nd Applic. azoxistrobine+benzovindiflupir). Was performed seven evaluations at 49 DAS (days after sowing) (phenological stage R3), 65 DAS (phenological stage R5.1), 72 DAS (phenological stage R5.2), 79 DAS (phenological stage R5.5), 100 DAS (phenological stage R6), 107 DAS (phenological stage R7), 114 DAS (phenological stage R9). Plant sanitary severity was measured at regular intervals (seven evaluations) to construct plant sanitary progress curves and calculate the area under sanitary plant progress curve (AUSPPC), rate of growth of injury (RGI). In those same intervals the chlorophyll content was also evaluated for the calculation of area under chlorophyll content progress curve (AUCCPC) and the rate of progress of chlorophyll content (RPCC). At 114 DAS plant height plant height was evaluated (AP), insertion area of the first node (AIPN), number of nodes per plant (NNPP), number of hairy per plant (NVPP), number of hairy per plant (NGPP), plant mass (MPLANT) and productivity (kg ha-1). The statistical data generated will be submitted to hypothesis testing and multivariate analysis. The treatments T3, T4 and T5 presented statistically the lowest averages of AUCCPC, with no difference in chlorophyll content (AUCCPC) between treatments. At 79 DAS, the maximum severity peak was considered in all treatments by analyzing the progress curves. There was no statistical difference between treatments regarding productivity. Considering effective methodology that encompasses multiple variables, the adoption of combined strategies that discriminate more factors that influence soybean damage are important strategies for recognizing effective management and its relationship with biotic and abiotic complexes. Fostering agency: Instituto Federal Goiano campus Urutaí.