Effeets of hydrogen eyanamide plus mineral oil sprays in Vitis vinifera L. ev. Thompson Seedless

Gabino Reginato M.1, Claudio Pinilla D.1 y José Luis Camus C.1

During 1991 season a trial was held in orderto determinethe effects of Hydrogen cyanamide (HC) plus mineral oil sprays in Thompson Seedless grape. The test took place in El Palqui, IV Region of Chile. The vines upon study were 8 years old, planted to 3.5 x 3.5 m and drip irrigated. Plants were sprayed 60 days before natural budbreak, with HC at 0.75, 0.50 and 0.25% of active ingredient (a.i.) combinedwith mineral oil in rates of 3 or 5%. A control was established with HC at 2.5% a.i. (traditional treatment) and also an untreated control. Budbreak, bloom and harvest were recorded. Results showed that mixtures of HC with mineral oil applied on Thompson Seedless grapes, were similar to the standard applications of HC at 2.5% a. i. in treated control in relation to total budbreak and early ripening enhancement (harvest).

Keywords: grapevines, hydrogen cyanamide, mineral oil, budbreak, fruit maturity.
1 Facultad de Ciencias Agrarias y Forestales, Universidad de Chile, Casilla 1004. Santiago, Chile.