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The aim of this study was to evaluate the effect of hydrogen peroxide (H2O2) as an oxygen source in the rhizosphere, in grafted tomato (cv. Durinta/cv Maxifor) and using coconut fiber as substrate The study was conducted from 2009 to 2010. Two treatments were used: a control without (H2O2) (T0) and the other with H2O2 (T1) applied in each irrigation. The parameters evaluated were i- fertigation: oxygen concentration ([O2]), pH, electrical conductivity (EC), and drainage percentage; ii- growth: basal diameter and plant height; iii- yield and iv- fruit quality: firmness, Brix degrees, dry weight, and pH. The average value of [O2] in the irrigation solution through out the crop cycle increased from 9,92 mg/l at T0 to 12,1 mg/l at T1 (P<0,05), meanwhile in the drained solution the value increased from 8,75 mg/l at T0 to 9,22 mg/l at T1 (P<0,05). Although significant differences (P<0.05) were reached in the [O2] between treatments during some periods of the crop cycle, the [O2] in the T0 did not reach a critical threshold that would affect the proper oxygenation of the roots. Therefore, there was no effect of hydrogen peroxide treatment on the growth, productivity and quality of the fruit.

Oxifertirrigación química mediante riego en tomate hidropónico cultivado en invernadero.