The experiment was carried out at the UNESP in Jaboticabal (Brazil). The tomato, long-life hybrid cv. Carmen, was grown in four substrates with fertigation applied weekly and twice a week in greenhouse conditions. The experimental design was a complete randomized block, with a factorial array of 4 x 2 (four substrates and two forms of fertigation), with four replications. The substrates used were: S1 = fine sand (0.250 - 0.105 mm); S2 = 1/2 fine sand + 1/2 crushed sugar-cane; S3 = 1/2 fine sand + 1/2 ground peanut bark (screened by 7 x 18 mm); S4 = 1/3 fine sand + 1/3 crushed sugar-cane + 1/3 ground peanut bark. The fertigations were: F1 = total amount of nutrients applied, once a week and F2 = half of the total amount applied twice a week. The amount of nutrients, in mg L-1, were: 200 of nitrogen, 60 of phosphorus, 350 of potassium, 206 of calcium, 60 of magnesium, 150 of sulphur, 0.50 of boron, 0.10 of copper, 2 of iron, 0.75 of manganese, 0.10 of zinc and 0.01 of molybdenum. The hydric dotation was realized based upon water evaporation in a class A pan, located at the center of the greenhouse. Plant height, number of bunches and fruits per plant, fruit weight and yield per plant were measured. The data were submitted to the variance analysis and the averages were compared by the test of Tukey, at the level of 5% of probability. The highest yield was obtained when the fertigation was applied twice a week. The results showed that the substrates S1, S3 and S4 can be used for tomate growth in greenhouse conditions.
Lycopersicon esculentum; soilless growth; nutrient solution; sand; crushed sugar-cane; peanut bark
