Resumen

MACIAS DUARTE, Rubén et al. Evaluation of growth regulators in onion for the control of the emission of floral stem. Rev. Mex. Cienc. Agríc [online]. 2017, vol.8, n.7, pp.1549-1560. ISSN 2007-0934.

The cultivation of the onion in México represents great economic importance, in the year 2014 was established 48 170 ha. The emission of floral stem represents a serious problem of production since it diminishes the quality and the yield. The objective of the present work was to evaluate the effect of growth phytoregulators on the reduction of the emission of floral stalk in onion. The experiment was developed during the autumn-winter cycle 2013-2014 in two localities (Magdalena and Caborca, Sonora). The products evaluated were: Apogee (Prohexadione Ca, 50 ppm), Cultar 25 SC (Paclobutrazol, 10 ppm), Ethrel (Etefon, 5000 ppm), Pix Plus (Mepiquat Chloride, two 42 ppm applications), Moddus 250 (Trinexapac -ethyl, two applications of 250 ppm) and Agromil V (1356 ppm). The application was done in foliar form with a volume of 500 L ha-1 for each treatment. In Magdalena, the results showed significant differences between the evaluated products in the emission of floral stem. The application of Ethrel and Pix Plus presented a positive response in the reduction of the floral stem with 10.5% against 30.7% of the control. On the other hand, Ethrel producedthe highest yield with 61.8 t ha-1. In Caborca there was no response to the application of growth regulators in the floral stem emission nor in commercial yield.

Palabras llave : Allium cepa L.; ethrel; quality; premature flowering; yield.

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