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35

Physiological effects of the F500 (pyraclostrobin) application in the soybean crop

Presenter: Edson Begliomini(1)

Other authors and affiliations: Marco Antonio Tavares Rodrigues(1), Eduardo Lima Leduc(1), Durval Dourado Neto(2). (1)BASF-SA, R&D Latin America, São Paulo 04538-132, Brazil; (2)São Paulo State University, ESALQ, Piracicaba, São Paulo 04538-132, Brazil

The objective was to verify the physiologic effects of F500 (pyraclostrobin + epoxiconazole) in the soybean crop. Experiments were carried under field conditions T1: F500 GS R2; T2: F500 GS R2 and R5.1; T3: F500 GS R2, another fungicide (triazole) GS R5.1; and T4: another fungicide GS R2 and R5.1 (standard fungicide treatment). The trials were performed during the 2004/2005 season in a experimental site of ESALQ, University of São Paulo, Piracicaba, SP. Four different soybean varieties were used (BRS 133, Coodetec 208, Conquista, and Monsoy 7508) and the following evaluations were performed: (i) activity of the enzyme nitrate reductase, (ii) relative production of ethylene, (iii) net photosynthesis, (iv) respiration, and (v) productivity of grains. For the ethylene analysis, 10 leaves of the plant were collected completely expanded (upper leaves). The analysis was performed with a gas chromatograph, in which three measurements of each treatment were made. For determination of the liquid photosynthesis and of the respiration, IRGA was used. The results verified the positive physiologic effect (i) of an additional application of F500 (comparison between treatments T1 and T2), (ii)of the second application of F500 (comparison between treatments T2 and T3), and (iii) of the two applications of F500 (comparison between treatments T2 and T4). F500 treatment increased the activity of the enzyme nitrate reductase, reduced the ethylene production for soybean leaves, increased the net photosynthesis, and reduced respiration. Due to these physiological effects, the productivity of the soybeans with one application of F500 (T1) was equivalent to the results with two applications of other fungicide (T4).

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