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36

Growth and development of soybean plants under application of F500 (pyraclostrobin + epoxiconazole) associated with the water stress

Presenter: Edson Begliomini(1)

Other authors and affiliations: Marco Antonio Tavares Rodrigues(1), Eduardo Lima Leduc(1), Durval Dourado Neto(2), Ricardo F. Oliveira(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 effect of F500 in the growth/stress of the soybean plants. Field tests were performed with and without irrigation: (i) F500 GS R2 with irrigation (T1); F500 GS R2 without irrigation (T2); (ii) F500 GS R2 and R5.1 with irrigation (T3); same without irrigation condition (T4); F500 GS R2 with application of another fungicide (triazol + estrobirulin) GS R5.1 with irrigation (T5); same without irrigation (T6); other fungicide (triazol + estrobirulin) GS R2 and R5.1 with irrigation (T7); same without irrigation (T8). The experiments were performed during 2003 and 2004 seasons at the experimental site of Esalq, USP, in Piracicaba-SP, with three soy varieties. Evaluation parameters: (i) MMS total, (ii) foliar area index (IAF), (iii) chlorophyll content (TC), duration of the cycle (DC), and (v) productivity of grains. Conclusions: (i) there was a positive physiologic effect in the yield and MMS, IAF, and TC due to F500 use with and without water stress; (ii) a larger physiologic effect was verified in the conditions with water stress; (iii) there was a positive physiologic effect in the yield and in the production components (iii.1) of an additional application of F500 (T1 against T3 and T2 against T4), (iii.2) of the second application of F500 (T3 against T5 and T4 against T6), and (iii.3) of the two applications of F500 (comparing T3 against T7 and T4 against T8) through the increase of total MMS, of the increase of IAF and of the duration of leaves, of the increase of TC, of the decrease of the reduction of DC, and of the increase of the yield.

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